[RFC v4 00/10] add initial RISC-V architecture support

[RFC v4 00/10] add initial RISC-V architecture support

[Antony Pavlov]

This patchseries adds initial RISC-V architecture support for barebox.

See Documentation/boards/riscv.rst for instructions.

You can obtain this patchseries from github:

    $ git clone -b 20170929.riscv https://github.com/frantony/barebox

Changes since RFC v3 (20161212) (http://lists.infradead.org/pipermail/barebox/2016-December/028716.html)

    * drop SiFive support, add support for custom Erizo SoC;
    * barebox runs on real hardware (e.g. DE0-Nano FPGA board,
      see https://github.com/miet-riscv-workgroup/rv32-simple-soc for details);
    * introduce NMON for RISC-V;
    * add relocator to start.S.

Changes since RFC v2 (20161113) (http://lists.infradead.org/pipermail/barebox/2016-November/028533.html):

    * add RV32 support.

Changes since RFC v1 (20161013) (http://lists.infradead.org/pipermail/barebox/2016-October/028309.html):

    * drop spike pk support;
    * add qemu-sifive board support;
    * add Documentation/boards/riscv.rst;
    * fix guard macro names

TODOs:

    * add pbl support;
    * sync with https://github.com/riscv/riscv-linux;
    * RV64 definitions are unused now;
    * sync MIPS debug_ll codes with RISC-V;
    * add support for Opencores I2C and SPI IP-blocks.

Antony Pavlov (10):
  Add initial RISC-V architecture support
  RISC-V: add Erizo SoC support
  RISC-V: add low-level debug macros for ns16550
  RISC-V: add nmon nano-monitor
  RISC-V: erizo: add DEBUG_LL support
  RISC-V: erizo: enable NMON
  RISC-V: erizo: add nmon image creation
  RISC-V: add erizo_generic_defconfig
  scripts: add nmon-loader
  Documentation: add RISC-V docs

 Documentation/boards/riscv.rst                | 110 ++++++++++++
 arch/riscv/Kconfig                            | 110 ++++++++++++
 arch/riscv/Makefile                           |  82 +++++++++
 arch/riscv/boards/erizo-generic/.gitignore    |   1 +
 arch/riscv/boards/erizo-generic/Makefile      |   1 +
 arch/riscv/boards/erizo-generic/board.c       |  28 +++
 arch/riscv/boot/Makefile                      |   2 +
 arch/riscv/boot/main_entry.c                  |  40 +++++
 arch/riscv/boot/start.S                       |  88 ++++++++++
 arch/riscv/configs/erizo_generic_defconfig    |  55 ++++++
 arch/riscv/dts/.gitignore                     |   1 +
 arch/riscv/dts/Makefile                       |   9 +
 arch/riscv/dts/erizo.dtsi                     |  46 +++++
 arch/riscv/dts/erizo_generic.dts              |  31 ++++
 arch/riscv/dts/skeleton.dtsi                  |  13 ++
 arch/riscv/include/asm/barebox.h              |   1 +
 arch/riscv/include/asm/bitops.h               |  35 ++++
 arch/riscv/include/asm/bitsperlong.h          |  10 ++
 arch/riscv/include/asm/byteorder.h            |  10 ++
 arch/riscv/include/asm/common.h               |   6 +
 arch/riscv/include/asm/debug_ll_ns16550.h     | 186 ++++++++++++++++++++
 arch/riscv/include/asm/elf.h                  |  11 ++
 arch/riscv/include/asm/io.h                   |   8 +
 arch/riscv/include/asm/mmu.h                  |   6 +
 arch/riscv/include/asm/posix_types.h          |   1 +
 arch/riscv/include/asm/riscv_nmon.h           | 234 ++++++++++++++++++++++++++
 arch/riscv/include/asm/sections.h             |   1 +
 arch/riscv/include/asm/string.h               |   1 +
 arch/riscv/include/asm/swab.h                 |   6 +
 arch/riscv/include/asm/types.h                |  60 +++++++
 arch/riscv/include/asm/unaligned.h            |  19 +++
 arch/riscv/lib/.gitignore                     |   1 +
 arch/riscv/lib/Makefile                       |   9 +
 arch/riscv/lib/ashldi3.c                      |  28 +++
 arch/riscv/lib/ashrdi3.c                      |  30 ++++
 arch/riscv/lib/asm-offsets.c                  |  12 ++
 arch/riscv/lib/barebox.lds.S                  |  89 ++++++++++
 arch/riscv/lib/dtb.c                          |  41 +++++
 arch/riscv/lib/libgcc.h                       |  29 ++++
 arch/riscv/lib/lshrdi3.c                      |  28 +++
 arch/riscv/lib/riscv_timer.c                  |  68 ++++++++
 arch/riscv/mach-erizo/Kconfig                 |  11 ++
 arch/riscv/mach-erizo/Makefile                |   3 +
 arch/riscv/mach-erizo/include/mach/debug_ll.h |  37 ++++
 drivers/of/Kconfig                            |   2 +-
 scripts/erizo-nmon-image                      |   3 +
 scripts/nmon-loader                           |  31 ++++
 47 files changed, 1633 insertions(+), 1 deletion(-)
 create mode 100644 Documentation/boards/riscv.rst
 create mode 100644 arch/riscv/Kconfig
 create mode 100644 arch/riscv/Makefile
 create mode 100644 arch/riscv/boards/erizo-generic/.gitignore
 create mode 100644 arch/riscv/boards/erizo-generic/Makefile
 create mode 100644 arch/riscv/boards/erizo-generic/board.c
 create mode 100644 arch/riscv/boot/Makefile
 create mode 100644 arch/riscv/boot/main_entry.c
 create mode 100644 arch/riscv/boot/start.S
 create mode 100644 arch/riscv/configs/erizo_generic_defconfig
 create mode 100644 arch/riscv/dts/.gitignore
 create mode 100644 arch/riscv/dts/Makefile
 create mode 100644 arch/riscv/dts/erizo.dtsi
 create mode 100644 arch/riscv/dts/erizo_generic.dts
 create mode 100644 arch/riscv/dts/skeleton.dtsi
 create mode 100644 arch/riscv/include/asm/barebox.h
 create mode 100644 arch/riscv/include/asm/bitops.h
 create mode 100644 arch/riscv/include/asm/bitsperlong.h
 create mode 100644 arch/riscv/include/asm/byteorder.h
 create mode 100644 arch/riscv/include/asm/common.h
 create mode 100644 arch/riscv/include/asm/debug_ll_ns16550.h
 create mode 100644 arch/riscv/include/asm/elf.h
 create mode 100644 arch/riscv/include/asm/io.h
 create mode 100644 arch/riscv/include/asm/mmu.h
 create mode 100644 arch/riscv/include/asm/posix_types.h
 create mode 100644 arch/riscv/include/asm/riscv_nmon.h
 create mode 100644 arch/riscv/include/asm/sections.h
 create mode 100644 arch/riscv/include/asm/string.h
 create mode 100644 arch/riscv/include/asm/swab.h
 create mode 100644 arch/riscv/include/asm/types.h
 create mode 100644 arch/riscv/include/asm/unaligned.h
 create mode 100644 arch/riscv/lib/.gitignore
 create mode 100644 arch/riscv/lib/Makefile
 create mode 100644 arch/riscv/lib/ashldi3.c
 create mode 100644 arch/riscv/lib/ashrdi3.c
 create mode 100644 arch/riscv/lib/asm-offsets.c
 create mode 100644 arch/riscv/lib/barebox.lds.S
 create mode 100644 arch/riscv/lib/dtb.c
 create mode 100644 arch/riscv/lib/libgcc.h
 create mode 100644 arch/riscv/lib/lshrdi3.c
 create mode 100644 arch/riscv/lib/riscv_timer.c
 create mode 100644 arch/riscv/mach-erizo/Kconfig
 create mode 100644 arch/riscv/mach-erizo/Makefile
 create mode 100644 arch/riscv/mach-erizo/include/mach/debug_ll.h
 create mode 100755 scripts/erizo-nmon-image
 create mode 100755 scripts/nmon-loader

-- 
2.14.1


_______________________________________________
barebox mailing list
barebox@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/barebox

[RFC v4 01/10] Add initial RISC-V architecture support

[Antony Pavlov]

Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
--
TODOs:

  * split patch;
---
 arch/riscv/Kconfig                   | 73 +++++++++++++++++++++++++++++
 arch/riscv/Makefile                  | 68 +++++++++++++++++++++++++++
 arch/riscv/boot/Makefile             |  2 +
 arch/riscv/boot/main_entry.c         | 40 ++++++++++++++++
 arch/riscv/boot/start.S              | 74 ++++++++++++++++++++++++++++++
 arch/riscv/dts/.gitignore            |  1 +
 arch/riscv/dts/Makefile              |  9 ++++
 arch/riscv/dts/skeleton.dtsi         | 13 ++++++
 arch/riscv/include/asm/barebox.h     |  1 +
 arch/riscv/include/asm/bitops.h      | 35 ++++++++++++++
 arch/riscv/include/asm/bitsperlong.h | 10 ++++
 arch/riscv/include/asm/byteorder.h   | 10 ++++
 arch/riscv/include/asm/common.h      |  6 +++
 arch/riscv/include/asm/elf.h         | 11 +++++
 arch/riscv/include/asm/io.h          |  8 ++++
 arch/riscv/include/asm/mmu.h         |  6 +++
 arch/riscv/include/asm/posix_types.h |  1 +
 arch/riscv/include/asm/sections.h    |  1 +
 arch/riscv/include/asm/string.h      |  1 +
 arch/riscv/include/asm/swab.h        |  6 +++
 arch/riscv/include/asm/types.h       | 60 ++++++++++++++++++++++++
 arch/riscv/include/asm/unaligned.h   | 19 ++++++++
 arch/riscv/lib/.gitignore            |  1 +
 arch/riscv/lib/Makefile              |  9 ++++
 arch/riscv/lib/ashldi3.c             | 28 ++++++++++++
 arch/riscv/lib/ashrdi3.c             | 30 ++++++++++++
 arch/riscv/lib/asm-offsets.c         | 12 +++++
 arch/riscv/lib/barebox.lds.S         | 89 ++++++++++++++++++++++++++++++++++++
 arch/riscv/lib/dtb.c                 | 41 +++++++++++++++++
 arch/riscv/lib/libgcc.h              | 29 ++++++++++++
 arch/riscv/lib/lshrdi3.c             | 28 ++++++++++++
 arch/riscv/lib/riscv_timer.c         | 68 +++++++++++++++++++++++++++
 drivers/of/Kconfig                   |  2 +-
 33 files changed, 791 insertions(+), 1 deletion(-)

diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
new file mode 100644
index 000000000..b2f0817ef
--- /dev/null
+++ b/arch/riscv/Kconfig
@@ -0,0 +1,73 @@
+config RISCV
+	bool
+	select GENERIC_FIND_NEXT_BIT
+	select HAVE_CONFIGURABLE_MEMORY_LAYOUT
+	select HAVE_CONFIGURABLE_TEXT_BASE
+	select GPIOLIB
+	select OFTREE
+	select COMMON_CLK
+	select COMMON_CLK_OF_PROVIDER
+	select CLKDEV_LOOKUP
+	default y
+
+config ARCH_TEXT_BASE
+	hex
+	default 0x0
+
+config GENERIC_LINKER_SCRIPT
+	bool
+	default y
+
+menu "Machine selection"
+
+choice
+	prompt "CPU selection"
+	default CPU_RV_GENERIC
+
+config CPU_RV_GENERIC
+	bool "Generic RISC-V"
+	select CPU_SUPPORTS_32BIT_KERNEL
+	select CPU_SUPPORTS_64BIT_KERNEL
+
+endchoice
+
+config CPU_SUPPORTS_32BIT_KERNEL
+	bool
+config CPU_SUPPORTS_64BIT_KERNEL
+	bool
+
+choice
+	prompt "barebox code model"
+	default 64BIT
+
+config 32BIT
+	bool "32-bit barebox"
+	depends on CPU_SUPPORTS_32BIT_KERNEL
+	help
+	  Select this option to build a 32-bit barebox.
+
+config 64BIT
+	bool "64-bit barebox"
+	depends on CPU_SUPPORTS_64BIT_KERNEL
+	help
+	  Select this option to build a 64-bit barebox.
+
+endchoice
+
+config BUILTIN_DTB
+	bool "link a DTB into the barebox image"
+	depends on OFTREE
+
+config BUILTIN_DTB_NAME
+	string "DTB to build into the barebox image"
+	depends on BUILTIN_DTB
+
+endmenu
+
+source common/Kconfig
+source commands/Kconfig
+source net/Kconfig
+source drivers/Kconfig
+source fs/Kconfig
+source lib/Kconfig
+source crypto/Kconfig
diff --git a/arch/riscv/Makefile b/arch/riscv/Makefile
new file mode 100644
index 000000000..4e3318cf1
--- /dev/null
+++ b/arch/riscv/Makefile
@@ -0,0 +1,68 @@
+CPPFLAGS += -fno-strict-aliasing
+
+cflags-y += -fno-pic -pipe
+cflags-y += -Wall -Wmissing-prototypes -Wstrict-prototypes \
+	-Wno-uninitialized -Wno-format -Wno-main -mcmodel=medany
+
+LDFLAGS += $(ldflags-y)
+LDFLAGS_barebox += -nostdlib
+
+TEXT_BASE = $(CONFIG_TEXT_BASE)
+CPPFLAGS += -DTEXT_BASE=$(CONFIG_TEXT_BASE)
+
+ifndef CONFIG_MODULES
+# Add cleanup flags
+CPPFLAGS += -fdata-sections -ffunction-sections
+LDFLAGS_barebox += -static --gc-sections
+endif
+
+KBUILD_BINARY := barebox.bin
+
+machdirs := $(patsubst %,arch/riscv/mach-%/,$(machine-y))
+
+ifneq ($(board-y),)
+BOARD := arch/riscv/boards/$(board-y)/
+else
+BOARD :=
+endif
+
+ifeq ($(KBUILD_SRC),)
+CPPFLAGS += -I$(BOARD)/include
+else
+CPPFLAGS += -I$(srctree)/$(BOARD)/include
+endif
+
+ifeq ($(KBUILD_SRC),)
+CPPFLAGS += $(patsubst %,-I%include,$(machdirs))
+else
+CPPFLAGS += $(patsubst %,-I$(srctree)/%include,$(machdirs))
+endif
+
+archprepare: maketools
+
+PHONY += maketools
+
+ifneq ($(machine-y),)
+MACH  := arch/riscv/mach-$(machine-y)/
+else
+MACH  :=
+endif
+
+ifneq ($(board-y),)
+BOARD := arch/riscv/boards/$(board-y)/
+else
+BOARD :=
+endif
+
+common-y += $(BOARD) $(MACH)
+common-y += arch/riscv/lib/
+common-y += arch/riscv/boot/
+
+common-$(CONFIG_OFTREE) += arch/riscv/dts/
+
+CPPFLAGS += $(cflags-y)
+CFLAGS += $(cflags-y)
+
+lds-y	:= arch/riscv/lib/barebox.lds
+
+CLEAN_FILES += arch/riscv/lib/barebox.lds
diff --git a/arch/riscv/boot/Makefile b/arch/riscv/boot/Makefile
new file mode 100644
index 000000000..d6d28ce65
--- /dev/null
+++ b/arch/riscv/boot/Makefile
@@ -0,0 +1,2 @@
+obj-y += start.o
+obj-y += main_entry.o
diff --git a/arch/riscv/boot/main_entry.c b/arch/riscv/boot/main_entry.c
new file mode 100644
index 000000000..18db86da5
--- /dev/null
+++ b/arch/riscv/boot/main_entry.c
@@ -0,0 +1,40 @@
+/*
+ * Copyright (C) 2016 Antony Pavlov <antonynpavlov@gmail.com>
+ *
+ * This file is part of barebox.
+ * See file CREDITS for list of people who contributed to this project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <common.h>
+#include <memory.h>
+#include <asm-generic/memory_layout.h>
+#include <asm/sections.h>
+
+void main_entry(void);
+
+/**
+ * Called plainly from assembler code
+ *
+ * @note The C environment isn't initialized yet
+ */
+void main_entry(void)
+{
+	/* clear the BSS first */
+	memset(__bss_start, 0x00, __bss_stop - __bss_start);
+
+	mem_malloc_init((void *)MALLOC_BASE,
+			(void *)(MALLOC_BASE + MALLOC_SIZE - 1));
+
+	start_barebox();
+}
diff --git a/arch/riscv/boot/start.S b/arch/riscv/boot/start.S
new file mode 100644
index 000000000..2fd00f63d
--- /dev/null
+++ b/arch/riscv/boot/start.S
@@ -0,0 +1,74 @@
+/*
+ * Startup Code for MIPS CPU
+ *
+ * based on coreboot/src/arch/riscv/bootblock.S
+ *
+ * Copyright (C) 2016 Antony Pavlov <antonynpavlov@gmail.com>
+ *
+ * This file is part of barebox.
+ * See file CREDITS for list of people who contributed to this project.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <asm-generic/memory_layout.h>
+
+	.text
+	.section ".text_entry"
+	.align 2
+
+.globl _start
+_start:
+	li sp, STACK_BASE + STACK_SIZE
+
+	# make room for HLS and initialize it
+	addi sp, sp, -64 /* MENTRY_FRAME_SIZE */
+
+	# poison the stack
+	li t1, STACK_BASE
+	li t0, 0xdeadbeef
+	sw t0, 0(t1)
+
+	# clear any pending interrupts
+	//csrwi mip, 0
+
+	/* copy barebox to link location */
+
+	la	a0, _start	/* a0 <- _start actual address */
+	li	a1, CONFIG_TEXT_BASE	/* a1 <- _start link address */
+
+	beq	a0, a1, main_entry
+
+	la	a2, __bss_start
+
+#define LONGSIZE 4
+
+copy_loop:
+	/* copy from source address [a0] */
+	lw	t0, LONGSIZE * 0(a0)
+	lw	t1, LONGSIZE * 1(a0)
+	lw	t2, LONGSIZE * 2(a0)
+	lw	t3, LONGSIZE * 3(a0)
+	/* copy to target address [a1] */
+	sw	t0, LONGSIZE * 0(a1)
+	sw	t1, LONGSIZE * 1(a1)
+	sw	t2, LONGSIZE * 2(a1)
+	sw	t3, LONGSIZE * 3(a1)
+	addi	a0, a0, LONGSIZE * 2
+	addi	a1, a1, LONGSIZE * 2
+	bgeu	a2, a0, copy_loop
+
+	/* Alas! At the moment I can't load main_entry __link__ address
+	   into a0 with la. Use CONFIG_TEXT_BASE instead. This solution
+	   leads to extra cycles for repeat sp initialization. */
+
+	li	a0, CONFIG_TEXT_BASE
+	jalr	a0
diff --git a/arch/riscv/dts/.gitignore b/arch/riscv/dts/.gitignore
new file mode 100644
index 000000000..077903c50
--- /dev/null
+++ b/arch/riscv/dts/.gitignore
@@ -0,0 +1 @@
+*dtb*
diff --git a/arch/riscv/dts/Makefile b/arch/riscv/dts/Makefile
new file mode 100644
index 000000000..f8380b11c
--- /dev/null
+++ b/arch/riscv/dts/Makefile
@@ -0,0 +1,9 @@
+BUILTIN_DTB := $(patsubst "%",%,$(CONFIG_BUILTIN_DTB_NAME))
+obj-$(CONFIG_BUILTIN_DTB) += $(BUILTIN_DTB).dtb.o
+
+# just to build a built-in.o. Otherwise compilation fails when no devicetree is
+# created.
+obj- += dummy.o
+
+always := $(dtb-y)
+clean-files := *.dtb *.dtb.S .*.dtc .*.pre .*.dts
diff --git a/arch/riscv/dts/skeleton.dtsi b/arch/riscv/dts/skeleton.dtsi
new file mode 100644
index 000000000..38ead821b
--- /dev/null
+++ b/arch/riscv/dts/skeleton.dtsi
@@ -0,0 +1,13 @@
+/*
+ * Skeleton device tree; the bare minimum needed to boot; just include and
+ * add a compatible value.  The bootloader will typically populate the memory
+ * node.
+ */
+
+/ {
+	#address-cells = <2>;
+	#size-cells = <1>;
+	chosen { };
+	aliases { };
+	memory { device_type = "memory"; reg = <0 0 0>; };
+};
diff --git a/arch/riscv/include/asm/barebox.h b/arch/riscv/include/asm/barebox.h
new file mode 100644
index 000000000..2997587d8
--- /dev/null
+++ b/arch/riscv/include/asm/barebox.h
@@ -0,0 +1 @@
+/* dummy */
diff --git a/arch/riscv/include/asm/bitops.h b/arch/riscv/include/asm/bitops.h
new file mode 100644
index 000000000..e77ab8320
--- /dev/null
+++ b/arch/riscv/include/asm/bitops.h
@@ -0,0 +1,35 @@
+/*
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ *
+ */
+
+#ifndef _ASM_BITOPS_H_
+#define _ASM_BITOPS_H_
+
+#include <asm-generic/bitops/__ffs.h>
+#include <asm-generic/bitops/__fls.h>
+#include <asm-generic/bitops/ffs.h>
+#include <asm-generic/bitops/fls.h>
+#include <asm-generic/bitops/ffz.h>
+#include <asm-generic/bitops/hweight.h>
+#include <asm-generic/bitops/fls64.h>
+#include <asm-generic/bitops/find.h>
+#include <asm-generic/bitops/ops.h>
+
+#define set_bit(x, y)			__set_bit(x, y)
+#define clear_bit(x, y)			__clear_bit(x, y)
+#define change_bit(x, y)		__change_bit(x, y)
+#define test_and_set_bit(x, y)		__test_and_set_bit(x, y)
+#define test_and_clear_bit(x, y)	__test_and_clear_bit(x, y)
+#define test_and_change_bit(x, y)	__test_and_change_bit(x, y)
+
+#endif /* _ASM_BITOPS_H_ */
diff --git a/arch/riscv/include/asm/bitsperlong.h b/arch/riscv/include/asm/bitsperlong.h
new file mode 100644
index 000000000..4641e7e48
--- /dev/null
+++ b/arch/riscv/include/asm/bitsperlong.h
@@ -0,0 +1,10 @@
+#ifndef __ASM_BITSPERLONG_H
+#define __ASM_BITSPERLONG_H
+
+#ifdef __riscv64
+#define BITS_PER_LONG 64
+#else
+#define BITS_PER_LONG 32
+#endif
+
+#endif /* __ASM_BITSPERLONG_H */
diff --git a/arch/riscv/include/asm/byteorder.h b/arch/riscv/include/asm/byteorder.h
new file mode 100644
index 000000000..778bb7224
--- /dev/null
+++ b/arch/riscv/include/asm/byteorder.h
@@ -0,0 +1,10 @@
+#ifndef _ASM_RISCV_BYTEORDER_H
+#define _ASM_RISCV_BYTEORDER_H
+
+#if defined(__RISCVEB__)
+#include <linux/byteorder/big_endian.h>
+#else
+#include <linux/byteorder/little_endian.h>
+#endif
+
+#endif /* _ASM_RISCV_BYTEORDER_H */
diff --git a/arch/riscv/include/asm/common.h b/arch/riscv/include/asm/common.h
new file mode 100644
index 000000000..bc8a17e30
--- /dev/null
+++ b/arch/riscv/include/asm/common.h
@@ -0,0 +1,6 @@
+#ifndef ASM_RISCV_COMMON_H
+#define ASM_RISCV_COMMON_H
+
+/* nothing special yet */
+
+#endif /* ASM_RISCV_COMMON_H */
diff --git a/arch/riscv/include/asm/elf.h b/arch/riscv/include/asm/elf.h
new file mode 100644
index 000000000..7134fa058
--- /dev/null
+++ b/arch/riscv/include/asm/elf.h
@@ -0,0 +1,11 @@
+#ifndef __ASM_RISCV_ELF_H__
+#define __ASM_RISCV_ELF_H__
+
+#if __SIZEOF_POINTER__ == 8
+#define ELF_CLASS	ELFCLASS64
+#define CONFIG_PHYS_ADDR_T_64BIT
+#else
+#define ELF_CLASS	ELFCLASS32
+#endif
+
+#endif /* __ASM_RISCV_ELF_H__ */
diff --git a/arch/riscv/include/asm/io.h b/arch/riscv/include/asm/io.h
new file mode 100644
index 000000000..3cdea7fca
--- /dev/null
+++ b/arch/riscv/include/asm/io.h
@@ -0,0 +1,8 @@
+#ifndef __ASM_RISCV_IO_H
+#define __ASM_RISCV_IO_H
+
+#define IO_SPACE_LIMIT 0
+
+#include <asm-generic/io.h>
+
+#endif /* __ASM_RISCV_IO_H */
diff --git a/arch/riscv/include/asm/mmu.h b/arch/riscv/include/asm/mmu.h
new file mode 100644
index 000000000..95af87142
--- /dev/null
+++ b/arch/riscv/include/asm/mmu.h
@@ -0,0 +1,6 @@
+#ifndef __ASM_MMU_H
+#define __ASM_MMU_H
+
+#define MAP_ARCH_DEFAULT MAP_UNCACHED
+
+#endif /* __ASM_MMU_H */
diff --git a/arch/riscv/include/asm/posix_types.h b/arch/riscv/include/asm/posix_types.h
new file mode 100644
index 000000000..22cae6230
--- /dev/null
+++ b/arch/riscv/include/asm/posix_types.h
@@ -0,0 +1 @@
+#include <asm-generic/posix_types.h>
diff --git a/arch/riscv/include/asm/sections.h b/arch/riscv/include/asm/sections.h
new file mode 100644
index 000000000..2b8c51603
--- /dev/null
+++ b/arch/riscv/include/asm/sections.h
@@ -0,0 +1 @@
+#include <asm-generic/sections.h>
diff --git a/arch/riscv/include/asm/string.h b/arch/riscv/include/asm/string.h
new file mode 100644
index 000000000..2997587d8
--- /dev/null
+++ b/arch/riscv/include/asm/string.h
@@ -0,0 +1 @@
+/* dummy */
diff --git a/arch/riscv/include/asm/swab.h b/arch/riscv/include/asm/swab.h
new file mode 100644
index 000000000..60a90120b
--- /dev/null
+++ b/arch/riscv/include/asm/swab.h
@@ -0,0 +1,6 @@
+#ifndef _ASM_SWAB_H
+#define _ASM_SWAB_H
+
+/* nothing. use generic functions */
+
+#endif /* _ASM_SWAB_H */
diff --git a/arch/riscv/include/asm/types.h b/arch/riscv/include/asm/types.h
new file mode 100644
index 000000000..ba386ab4c
--- /dev/null
+++ b/arch/riscv/include/asm/types.h
@@ -0,0 +1,60 @@
+#ifndef __ASM_RISCV_TYPES_H
+#define __ASM_RISCV_TYPES_H
+
+#ifdef __riscv64
+/*
+ * This is used in dlmalloc. On RISCV64 we need it to be 64 bit
+ */
+#define INTERNAL_SIZE_T unsigned long
+
+/*
+ * This is a Kconfig variable in the Kernel, but we want to detect
+ * this during compile time, so we set it here.
+ */
+#define CONFIG_PHYS_ADDR_T_64BIT
+
+#endif
+
+typedef unsigned short umode_t;
+
+/*
+ * __xx is ok: it doesn't pollute the POSIX namespace. Use these in the
+ * header files exported to user space
+ */
+
+typedef __signed__ char __s8;
+typedef unsigned char __u8;
+
+typedef __signed__ short __s16;
+typedef unsigned short __u16;
+
+typedef __signed__ int __s32;
+typedef unsigned int __u32;
+
+#if defined(__GNUC__) && !defined(__STRICT_ANSI__)
+typedef __signed__ long long __s64;
+typedef unsigned long long __u64;
+#endif
+
+/*
+ * These aren't exported outside the kernel to avoid name space clashes
+ */
+#ifdef __KERNEL__
+
+typedef signed char s8;
+typedef unsigned char u8;
+
+typedef signed short s16;
+typedef unsigned short u16;
+
+typedef signed int s32;
+typedef unsigned int u32;
+
+typedef signed long long s64;
+typedef unsigned long long u64;
+
+#include <asm/bitsperlong.h>
+
+#endif /* __KERNEL__ */
+
+#endif /* __ASM_RISCV_TYPES_H */
diff --git a/arch/riscv/include/asm/unaligned.h b/arch/riscv/include/asm/unaligned.h
new file mode 100644
index 000000000..aaebc0641
--- /dev/null
+++ b/arch/riscv/include/asm/unaligned.h
@@ -0,0 +1,19 @@
+#ifndef _ASM_RISCV_UNALIGNED_H
+#define _ASM_RISCV_UNALIGNED_H
+
+/*
+ * FIXME: this file is copy-n-pasted from sandbox's unaligned.h
+ */
+
+#include <linux/unaligned/access_ok.h>
+#include <linux/unaligned/generic.h>
+
+#if __BYTE_ORDER == __LITTLE_ENDIAN
+#define get_unaligned __get_unaligned_le
+#define put_unaligned __put_unaligned_le
+#else
+#define get_unaligned __get_unaligned_be
+#define put_unaligned __put_unaligned_be
+#endif
+
+#endif /* _ASM_RISCV_UNALIGNED_H */
diff --git a/arch/riscv/lib/.gitignore b/arch/riscv/lib/.gitignore
new file mode 100644
index 000000000..d1165788c
--- /dev/null
+++ b/arch/riscv/lib/.gitignore
@@ -0,0 +1 @@
+barebox.lds
diff --git a/arch/riscv/lib/Makefile b/arch/riscv/lib/Makefile
new file mode 100644
index 000000000..313363c1a
--- /dev/null
+++ b/arch/riscv/lib/Makefile
@@ -0,0 +1,9 @@
+extra-$(CONFIG_GENERIC_LINKER_SCRIPT) += barebox.lds
+
+obj-y += riscv_timer.o
+
+obj-$(CONFIG_32BIT) += lshrdi3.o
+obj-$(CONFIG_32BIT) += ashldi3.o
+obj-$(CONFIG_32BIT) += ashrdi3.o
+
+obj-$(CONFIG_BUILTIN_DTB) += dtb.o
diff --git a/arch/riscv/lib/ashldi3.c b/arch/riscv/lib/ashldi3.c
new file mode 100644
index 000000000..cbdbcbb6a
--- /dev/null
+++ b/arch/riscv/lib/ashldi3.c
@@ -0,0 +1,28 @@
+#include <module.h>
+
+#include "libgcc.h"
+
+long long __ashldi3(long long u, word_type b)
+{
+	DWunion uu, w;
+	word_type bm;
+
+	if (b == 0)
+		return u;
+
+	uu.ll = u;
+	bm = 32 - b;
+
+	if (bm <= 0) {
+		w.s.low = 0;
+		w.s.high = (unsigned int) uu.s.low << -bm;
+	} else {
+		const unsigned int carries = (unsigned int) uu.s.low >> bm;
+
+		w.s.low = (unsigned int) uu.s.low << b;
+		w.s.high = ((unsigned int) uu.s.high << b) | carries;
+	}
+
+	return w.ll;
+}
+EXPORT_SYMBOL(__ashldi3);
diff --git a/arch/riscv/lib/ashrdi3.c b/arch/riscv/lib/ashrdi3.c
new file mode 100644
index 000000000..928d6d97c
--- /dev/null
+++ b/arch/riscv/lib/ashrdi3.c
@@ -0,0 +1,30 @@
+#include <module.h>
+
+#include "libgcc.h"
+
+long long __ashrdi3(long long u, word_type b)
+{
+	DWunion uu, w;
+	word_type bm;
+
+	if (b == 0)
+		return u;
+
+	uu.ll = u;
+	bm = 32 - b;
+
+	if (bm <= 0) {
+		/* w.s.high = 1..1 or 0..0 */
+		w.s.high =
+		    uu.s.high >> 31;
+		w.s.low = uu.s.high >> -bm;
+	} else {
+		const unsigned int carries = (unsigned int) uu.s.high << bm;
+
+		w.s.high = uu.s.high >> b;
+		w.s.low = ((unsigned int) uu.s.low >> b) | carries;
+	}
+
+	return w.ll;
+}
+EXPORT_SYMBOL(__ashrdi3);
diff --git a/arch/riscv/lib/asm-offsets.c b/arch/riscv/lib/asm-offsets.c
new file mode 100644
index 000000000..22f382b71
--- /dev/null
+++ b/arch/riscv/lib/asm-offsets.c
@@ -0,0 +1,12 @@
+/*
+ * Generate definitions needed by assembly language modules.
+ * This code generates raw asm output which is post-processed to extract
+ * and format the required data.
+ */
+
+#include <linux/kbuild.h>
+
+int main(void)
+{
+	return 0;
+}
diff --git a/arch/riscv/lib/barebox.lds.S b/arch/riscv/lib/barebox.lds.S
new file mode 100644
index 000000000..9468fb8b5
--- /dev/null
+++ b/arch/riscv/lib/barebox.lds.S
@@ -0,0 +1,89 @@
+/*
+ * Copyright (C) 2016 Antony Pavlov <antonynpavlov@gmail.com>
+ *
+ * This file is part of barebox.
+ * See file CREDITS for list of people who contributed to this project.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <asm-generic/barebox.lds.h>
+
+OUTPUT_ARCH(riscv)
+ENTRY(_start)
+SECTIONS
+{
+	. = TEXT_BASE;
+
+	. = ALIGN(8);
+	.text      :
+	{
+		_stext = .;
+		_start = .;
+		KEEP(*(.text_entry*))
+		_text = .;
+		__bare_init_start = .;
+		*(.text_bare_init*)
+		__bare_init_end = .;
+		*(.text*)
+	}
+	BAREBOX_BARE_INIT_SIZE
+
+	PRE_IMAGE
+
+	. = ALIGN(8);
+	.rodata : { *(.rodata*) }
+
+	_etext = .;			/* End of text and rodata section */
+	_sdata = .;
+
+	. = ALIGN(8);
+	.data : { *(.data*) }
+
+	.barebox_imd : { BAREBOX_IMD }
+
+	. = ALIGN(8);
+	.got : { *(.got*) }
+
+	. = .;
+	__barebox_cmd_start = .;
+	.barebox_cmd : { BAREBOX_CMDS }
+	__barebox_cmd_end = .;
+
+	__barebox_magicvar_start = .;
+	.barebox_magicvar : { BAREBOX_MAGICVARS }
+	__barebox_magicvar_end = .;
+
+	__barebox_initcalls_start = .;
+	.barebox_initcalls : { INITCALLS }
+	__barebox_initcalls_end = .;
+
+	__barebox_exitcalls_start = .;
+	.barebox_exitcalls : { EXITCALLS }
+	__barebox_exitcalls_end = .;
+
+	__usymtab_start = .;
+	__usymtab : { BAREBOX_SYMS }
+	__usymtab_end = .;
+
+	.rela.dyn : { *(.rela*) }
+
+	.oftables : { BAREBOX_CLK_TABLE() }
+
+	.dtb : { BAREBOX_DTB() }
+
+	_edata = .;
+	. = ALIGN(8);
+	__bss_start = .;
+	.bss : { *(.bss*) *(.sbss*) }
+	__bss_stop = .;
+	_end = .;
+}
diff --git a/arch/riscv/lib/dtb.c b/arch/riscv/lib/dtb.c
new file mode 100644
index 000000000..09f519dcc
--- /dev/null
+++ b/arch/riscv/lib/dtb.c
@@ -0,0 +1,41 @@
+/*
+ * Copyright (C) 2016 Antony Pavlov <antonynpavlov@gmail.com>
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+#include <common.h>
+#include <init.h>
+#include <of.h>
+
+extern char __dtb_start[];
+
+static int of_riscv_init(void)
+{
+	struct device_node *root;
+
+	root = of_get_root_node();
+	if (root)
+		return 0;
+
+	root = of_unflatten_dtb(__dtb_start);
+	if (!IS_ERR(root)) {
+		pr_debug("using internal DTB\n");
+		of_set_root_node(root);
+		if (IS_ENABLED(CONFIG_OFDEVICE))
+			of_probe();
+	}
+
+	return 0;
+}
+core_initcall(of_riscv_init);
diff --git a/arch/riscv/lib/libgcc.h b/arch/riscv/lib/libgcc.h
new file mode 100644
index 000000000..593e59802
--- /dev/null
+++ b/arch/riscv/lib/libgcc.h
@@ -0,0 +1,29 @@
+#ifndef __ASM_LIBGCC_H
+#define __ASM_LIBGCC_H
+
+#include <asm/byteorder.h>
+
+typedef int word_type __attribute__ ((mode (__word__)));
+
+#ifdef __BIG_ENDIAN
+struct DWstruct {
+	int high, low;
+};
+#elif defined(__LITTLE_ENDIAN)
+struct DWstruct {
+	int low, high;
+};
+#else
+#error I feel sick.
+#endif
+
+typedef union {
+	struct DWstruct s;
+	long long ll;
+} DWunion;
+
+long long __lshrdi3(long long u, word_type b);
+long long __ashldi3(long long u, word_type b);
+long long __ashrdi3(long long u, word_type b);
+
+#endif /* __ASM_LIBGCC_H */
diff --git a/arch/riscv/lib/lshrdi3.c b/arch/riscv/lib/lshrdi3.c
new file mode 100644
index 000000000..74a4846e9
--- /dev/null
+++ b/arch/riscv/lib/lshrdi3.c
@@ -0,0 +1,28 @@
+#include <module.h>
+
+#include "libgcc.h"
+
+long long __lshrdi3(long long u, word_type b)
+{
+	DWunion uu, w;
+	word_type bm;
+
+	if (b == 0)
+		return u;
+
+	uu.ll = u;
+	bm = 32 - b;
+
+	if (bm <= 0) {
+		w.s.high = 0;
+		w.s.low = (unsigned int) uu.s.high >> -bm;
+	} else {
+		const unsigned int carries = (unsigned int) uu.s.high << bm;
+
+		w.s.high = (unsigned int) uu.s.high >> b;
+		w.s.low = ((unsigned int) uu.s.low >> b) | carries;
+	}
+
+	return w.ll;
+}
+EXPORT_SYMBOL(__lshrdi3);
diff --git a/arch/riscv/lib/riscv_timer.c b/arch/riscv/lib/riscv_timer.c
new file mode 100644
index 000000000..46181f877
--- /dev/null
+++ b/arch/riscv/lib/riscv_timer.c
@@ -0,0 +1,68 @@
+/*
+ * Copyright (C) 2017 Antony Pavlov <antonynpavlov@gmail.com>
+ *
+ * This file is part of barebox.
+ * See file CREDITS for list of people who contributed to this project.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+/**
+ * @file
+ * @brief Clocksource based on RISCV cycle CSR timer
+ */
+
+#include <init.h>
+#include <of.h>
+#include <linux/clk.h>
+#include <clock.h>
+#include <io.h>
+
+static uint64_t rdcycle_read(void)
+{
+	register unsigned long __v;
+
+	__asm__ __volatile__ ("rdcycle %0" : "=r" (__v));
+
+	return __v;
+}
+
+static struct clocksource rdcycle_cs = {
+	.read	= rdcycle_read,
+	.mask	= CLOCKSOURCE_MASK(32),
+};
+
+static int rdcycle_cs_init(void)
+{
+	unsigned int cycle_frequency;
+
+	/* default rate: 100 MHz */
+	cycle_frequency = 100000000;
+
+	if (IS_ENABLED(CONFIG_OFTREE)) {
+		struct device_node *np;
+		struct clk *clk;
+
+		np = of_get_cpu_node(0, NULL);
+		if (np) {
+			clk = of_clk_get(np, 0);
+			if (!IS_ERR(clk)) {
+				cycle_frequency = clk_get_rate(clk);
+			}
+		}
+	}
+
+	clocks_calc_mult_shift(&rdcycle_cs.mult, &rdcycle_cs.shift,
+		cycle_frequency, NSEC_PER_SEC, 10);
+
+	return init_clock(&rdcycle_cs);
+}
+postcore_initcall(rdcycle_cs_init);
diff --git a/drivers/of/Kconfig b/drivers/of/Kconfig
index a1fac0e61..24cf4465a 100644
--- a/drivers/of/Kconfig
+++ b/drivers/of/Kconfig
@@ -4,7 +4,7 @@ config OFTREE
 
 config OFTREE_MEM_GENERIC
 	depends on OFTREE
-	depends on PPC || ARM || EFI_BOOTUP || OPENRISC || SANDBOX
+	depends on PPC || ARM || EFI_BOOTUP || OPENRISC || SANDBOX || RISCV
 	def_bool y
 
 config DTC
-- 
2.14.1


_______________________________________________
barebox mailing list
barebox@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/barebox

Re: [RFC v4 01/10] Add initial RISC-V architecture support

[Oleksij Rempel]

[-- Attachment #1.1.1: Type: text/plain, Size: 29328 bytes --]

Hi,

hm... mostly looks identical with existing arch

Am 29.09.2017 um 01:12 schrieb Antony Pavlov:
> Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
> --
> TODOs:
> 
>   * split patch;
> ---
>  arch/riscv/Kconfig                   | 73 +++++++++++++++++++++++++++++
>  arch/riscv/Makefile                  | 68 +++++++++++++++++++++++++++
>  arch/riscv/boot/Makefile             |  2 +
>  arch/riscv/boot/main_entry.c         | 40 ++++++++++++++++
>  arch/riscv/boot/start.S              | 74 ++++++++++++++++++++++++++++++
>  arch/riscv/dts/.gitignore            |  >  arch/riscv/dts/Makefile              |  9 ++++
>  arch/riscv/dts/skeleton.dtsi         | 13 ++++++
>  arch/riscv/include/asm/barebox.h     |  1 +
>  arch/riscv/include/asm/bitops.h      | 35 ++++++++++++++
>  arch/riscv/include/asm/bitsperlong.h | 10 ++++
>  arch/riscv/include/asm/byteorder.h   | 10 ++++
>  arch/riscv/include/asm/common.h      |  6 +++
>  arch/riscv/include/asm/elf.h         | 11 +++++
>  arch/riscv/include/asm/io.h          |  8 ++++
>  arch/riscv/include/asm/mmu.h         |  6 +++
>  arch/riscv/include/asm/posix_types.h |  1 +
>  arch/riscv/include/asm/sections.h    |  1 +
>  arch/riscv/include/asm/string.h      |  1 +
>  arch/riscv/include/asm/swab.h        |  6 +++
>  arch/riscv/include/asm/types.h       | 60 ++++++++++++++++++++++++
>  arch/riscv/include/asm/unaligned.h   | 19 ++++++++
>  arch/riscv/lib/.gitignore            |  1 +
>  arch/riscv/lib/Makefile              |  9 ++++
>  arch/riscv/lib/ashldi3.c             | 28 ++++++++++++
>  arch/riscv/lib/ashrdi3.c             | 30 ++++++++++++
>  arch/riscv/lib/asm-offsets.c         | 12 +++++
>  arch/riscv/lib/barebox.lds.S         | 89 ++++++++++++++++++++++++++++++++++++
>  arch/riscv/lib/dtb.c                 | 41 +++++++++++++++++
>  arch/riscv/lib/libgcc.h              | 29 ++++++++++++
>  arch/riscv/lib/lshrdi3.c             | 28 ++++++++++++
>  arch/riscv/lib/riscv_timer.c         | 68 +++++++++++++++++++++++++++
>  drivers/of/Kconfig                   |  2 +-
>  33 files changed, 791 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
> new file mode 100644
> index 000000000..b2f0817ef
> --- /dev/null
> +++ b/arch/riscv/Kconfig
> @@ -0,0 +1,73 @@
> +config RISCV
> +	bool
> +	select GENERIC_FIND_NEXT_BIT
> +	select HAVE_CONFIGURABLE_MEMORY_LAYOUT
> +	select HAVE_CONFIGURABLE_TEXT_BASE
> +	select GPIOLIB
> +	select OFTREE
> +	select COMMON_CLK
> +	select COMMON_CLK_OF_PROVIDER
> +	select CLKDEV_LOOKUP
> +	default y
> +
> +config ARCH_TEXT_BASE
> +	hex
> +	default 0x0
> +
> +config GENERIC_LINKER_SCRIPT
> +	bool
> +	default y
> +
> +menu "Machine selection"
> +
> +choice
> +	prompt "CPU selection"
> +	default CPU_RV_GENERIC
> +
> +config CPU_RV_GENERIC
> +	bool "Generic RISC-V"
> +	select CPU_SUPPORTS_32BIT_KERNEL
> +	select CPU_SUPPORTS_64BIT_KERNEL
> +
> +endchoice
> +
> +config CPU_SUPPORTS_32BIT_KERNEL
> +	bool
> +config CPU_SUPPORTS_64BIT_KERNEL
> +	bool
> +
> +choice
> +	prompt "barebox code model"
> +	default 64BIT
> +
> +config 32BIT
> +	bool "32-bit barebox"
> +	depends on CPU_SUPPORTS_32BIT_KERNEL
> +	help
> +	  Select this option to build a 32-bit barebox.
> +
> +config 64BIT
> +	bool "64-bit barebox"
> +	depends on CPU_SUPPORTS_64BIT_KERNEL
> +	help
> +	  Select this option to build a 64-bit barebox.
> +
> +endchoice
> +
> +config BUILTIN_DTB
> +	bool "link a DTB into the barebox image"
> +	depends on OFTREE
> +
> +config BUILTIN_DTB_NAME
> +	string "DTB to build into the barebox image"
> +	depends on BUILTIN_DTB
> +
> +endmenu
> +
> +source common/Kconfig
> +source commands/Kconfig
> +source net/Kconfig
> +source drivers/Kconfig
> +source fs/Kconfig
> +source lib/Kconfig
> +source crypto/Kconfig
> diff --git a/arch/riscv/Makefile b/arch/riscv/Makefile
> new file mode 100644
> index 000000000..4e3318cf1
> --- /dev/null
> +++ b/arch/riscv/Makefile
> @@ -0,0 +1,68 @@
> +CPPFLAGS += -fno-strict-aliasing
> +
> +cflags-y += -fno-pic -pipe
> +cflags-y += -Wall -Wmissing-prototypes -Wstrict-prototypes \
> +	-Wno-uninitialized -Wno-format -Wno-main -mcmodel=medany
> +
> +LDFLAGS += $(ldflags-y)
> +LDFLAGS_barebox += -nostdlib
> +
> +TEXT_BASE = $(CONFIG_TEXT_BASE)
> +CPPFLAGS += -DTEXT_BASE=$(CONFIG_TEXT_BASE)
> +
> +ifndef CONFIG_MODULES
> +# Add cleanup flags
> +CPPFLAGS += -fdata-sections -ffunction-sections
> +LDFLAGS_barebox += -static --gc-sections
> +endif
> +
> +KBUILD_BINARY := barebox.bin
> +
> +machdirs := $(patsubst %,arch/riscv/mach-%/,$(machine-y))
> +
> +ifneq ($(board-y),)
> +BOARD := arch/riscv/boards/$(board-y)/
> +else
> +BOARD :=
> +endif
> +
> +ifeq ($(KBUILD_SRC),)
> +CPPFLAGS += -I$(BOARD)/include
> +else
> +CPPFLAGS += -I$(srctree)/$(BOARD)/include
> +endif
> +
> +ifeq ($(KBUILD_SRC),)
> +CPPFLAGS += $(patsubst %,-I%include,$(machdirs))
> +else
> +CPPFLAGS += $(patsubst %,-I$(srctree)/%include,$(machdirs))
> +endif
> +
> +archprepare: maketools
> +
> +PHONY += maketools
> +
> +ifneq ($(machine-y),)
> +MACH  := arch/riscv/mach-$(machine-y)/
> +else
> +MACH  :=
> +endif
> +
> +ifneq ($(board-y),)
> +BOARD := arch/riscv/boards/$(board-y)/
> +else
> +BOARD :=
> +endif
> +
> +common-y += $(BOARD) $(MACH)
> +common-y += arch/riscv/lib/
> +common-y += arch/riscv/boot/
> +
> +common-$(CONFIG_OFTREE) += arch/riscv/dts/
> +
> +CPPFLAGS += $(cflags-y)
> +CFLAGS += $(cflags-y)
> +
> +lds-y	:= arch/riscv/lib/barebox.lds
> +
> +CLEAN_FILES += arch/riscv/lib/barebox.lds
> diff --git a/arch/riscv/boot/Makefile b/arch/riscv/boot/Makefile
> new file mode 100644
> index 000000000..d6d28ce65
> --- /dev/null
> +++ b/arch/riscv/boot/Makefile
> @@ -0,0 +1,2 @@
> +obj-y += start.o
> +obj-y += main_entry.o
> diff --git a/arch/riscv/boot/main_entry.c b/arch/riscv/boot/main_entry.c
> new file mode 100644
> index 000000000..18db86da5
> --- /dev/null
> +++ b/arch/riscv/boot/main_entry.c
> @@ -0,0 +1,40 @@
> +/*
> + * Copyright (C) 2016 Antony Pavlov <antonynpavlov@gmail.com>
> + *
> + * This file is part of barebox.
> + * See file CREDITS for list of people who contributed to this project.
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License as
> + * published by the Free Software Foundation; either version 2 of
> + * the License, or (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + *
> + */
> +
> +#include <common.h>
> +#include <memory.h>
> +#include <asm-generic/memory_layout.h>
> +#include <asm/sections.h>
> +
> +void main_entry(void);
> +
> +/**
> + * Called plainly from assembler code
> + *
> + * @note The C environment isn't initialized yet
> + */
> +void main_entry(void)
> +{
> +	/* clear the BSS first */
> +	memset(__bss_start, 0x00, __bss_stop - __bss_start);
> +
> +	mem_malloc_init((void *)MALLOC_BASE,
> +			(void *)(MALLOC_BASE + MALLOC_SIZE - 1));
> +
> +	start_barebox();
> +}
> diff --git a/arch/riscv/boot/start.S b/arch/riscv/boot/start.S
> new file mode 100644
> index 000000000..2fd00f63d
> --- /dev/null
> +++ b/arch/riscv/boot/start.S
> @@ -0,0 +1,74 @@
> +/*
> + * Startup Code for MIPS CPU
> + *
> + * based on coreboot/src/arch/riscv/bootblock.S
> + *
> + * Copyright (C) 2016 Antony Pavlov <antonynpavlov@gmail.com>
> + *
> + * This file is part of barebox.
> + * See file CREDITS for list of people who contributed to this project.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2
> + * as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + *
> + */
> +
> +#include <asm-generic/memory_layout.h>
> +
> +	.text
> +	.section ".text_entry"
> +	.align 2
> +
> +.globl _start
> +_start:
> +	li sp, STACK_BASE + STACK_SIZE
> +
> +	# make room for HLS and initialize it
> +	addi sp, sp, -64 /* MENTRY_FRAME_SIZE */
> +
> +	# poison the stack
> +	li t1, STACK_BASE
> +	li t0, 0xdeadbeef
> +	sw t0, 0(t1)
> +
> +	# clear any pending interrupts
> +	//csrwi mip, 0

should be removed.

> +	/* copy barebox to link location */
> +
> +	la	a0, _start	/* a0 <- _start actual address */
> +	li	a1, CONFIG_TEXT_BASE	/* a1 <- _start link address */
> +
> +	beq	a0, a1, main_entry
> +
> +	la	a2, __bss_start
> +
> +#define LONGSIZE 4
> +
> +copy_loop:
> +	/* copy from source address [a0] */
> +	lw	t0, LONGSIZE * 0(a0)
> +	lw	t1, LONGSIZE * 1(a0)
> +	lw	t2, LONGSIZE * 2(a0)
> +	lw	t3, LONGSIZE * 3(a0)
> +	/* copy to target address [a1] */
> +	sw	t0, LONGSIZE * 0(a1)
> +	sw	t1, LONGSIZE * 1(a1)
> +	sw	t2, LONGSIZE * 2(a1)
> +	sw	t3, LONGSIZE * 3(a1)
> +	addi	a0, a0, LONGSIZE * 2
> +	addi	a1, a1, LONGSIZE * 2
> +	bgeu	a2, a0, copy_loop
> +
> +	/* Alas! At the moment I can't load main_entry __link__ address
> +	   into a0 with la. Use CONFIG_TEXT_BASE instead. This solution
> +	   leads to extra cycles for repeat sp initialization. */
> +
> +	li	a0, CONFIG_TEXT_BASE
> +	jalr	a0
> diff --git a/arch/riscv/dts/.gitignore b/arch/riscv/dts/.gitignore
> new file mode 100644
> index 000000000..077903c50
> --- /dev/null
> +++ b/arch/riscv/dts/.gitignore
> @@ -0,0 +1 @@
> +*dtb*
> diff --git a/arch/riscv/dts/Makefile b/arch/riscv/dts/Makefile
> new file mode 100644
> index 000000000..f8380b11c
> --- /dev/null
> +++ b/arch/riscv/dts/Makefile
> @@ -0,0 +1,9 @@
> +BUILTIN_DTB := $(patsubst "%",%,$(CONFIG_BUILTIN_DTB_NAME))
> +obj-$(CONFIG_BUILTIN_DTB) += $(BUILTIN_DTB).dtb.o
> +
> +# just to build a built-in.o. Otherwise compilation fails when no devicetree is
> +# created.
> +obj- += dummy.o
> +
> +always := $(dtb-y)
> +clean-files := *.dtb *.dtb.S .*.dtc .*.pre .*.dts
> diff --git a/arch/riscv/dts/skeleton.dtsi b/arch/riscv/dts/skeleton.dtsi
> new file mode 100644
> index 000000000..38ead821b
> --- /dev/null
> +++ b/arch/riscv/dts/skeleton.dtsi
> @@ -0,0 +1,13 @@
> +/*
> + * Skeleton device tree; the bare minimum needed to boot; just include and
> + * add a compatible value.  The bootloader will typically populate the memory
> + * node.
> + */
> +
> +/ {
> +	#address-cells = <2>;
> +	#size-cells = <1>;
> +	chosen { };
> +	aliases { };
> +	memory { device_type = "memory"; reg = <0 0 0>; };

"reg = <0 0>" instead?

> +};
> diff --git a/arch/riscv/include/asm/barebox.h b/arch/riscv/include/asm/barebox.h
> new file mode 100644
> index 000000000..2997587d8
> --- /dev/null
> +++ b/arch/riscv/include/asm/barebox.h
> @@ -0,0 +1 @@
> +/* dummy */
> diff --git a/arch/riscv/include/asm/bitops.h b/arch/riscv/include/asm/bitops.h
> new file mode 100644
> index 000000000..e77ab8320
> --- /dev/null
> +++ b/arch/riscv/include/asm/bitops.h
> @@ -0,0 +1,35 @@
> +/*
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License as
> + * published by the Free Software Foundation; either version 2 of
> + * the License, or (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + *
> + *
> + */
> +
> +#ifndef _ASM_BITOPS_H_
> +#define _ASM_BITOPS_H_
> +
> +#include <asm-generic/bitops/__ffs.h>
> +#include <asm-generic/bitops/__fls.h>
> +#include <asm-generic/bitops/ffs.h>
> +#include <asm-generic/bitops/fls.h>
> +#include <asm-generic/bitops/ffz.h>
> +#include <asm-generic/bitops/hweight.h>
> +#include <asm-generic/bitops/fls64.h>
> +#include <asm-generic/bitops/find.h>
> +#include <asm-generic/bitops/ops.h>
> +
> +#define set_bit(x, y)			__set_bit(x, y)
> +#define clear_bit(x, y)			__clear_bit(x, y)
> +#define change_bit(x, y)		__change_bit(x, y)
> +#define test_and_set_bit(x, y)		__test_and_set_bit(x, y)
> +#define test_and_clear_bit(x, y)	__test_and_clear_bit(x, y)
> +#define test_and_change_bit(x, y)	__test_and_change_bit(x, y)
> +
> +#endif /* _ASM_BITOPS_H_ */
> diff --git a/arch/riscv/include/asm/bitsperlong.h b/arch/riscv/include/asm/bitsperlong.h
> new file mode 100644
> index 000000000..4641e7e48
> --- /dev/null
> +++ b/arch/riscv/include/asm/bitsperlong.h
> @@ -0,0 +1,10 @@
> +#ifndef __ASM_BITSPERLONG_H
> +#define __ASM_BITSPERLONG_H
> +
> +#ifdef __riscv64
> +#define BITS_PER_LONG 64
> +#else
> +#define BITS_PER_LONG 32
> +#endif
> +
> +#endif /* __ASM_BITSPERLONG_H */
> diff --git a/arch/riscv/include/asm/byteorder.h b/arch/riscv/include/asm/byteorder.h
> new file mode 100644
> index 000000000..778bb7224
> --- /dev/null
> +++ b/arch/riscv/include/asm/byteorder.h
> @@ -0,0 +1,10 @@
> +#ifndef _ASM_RISCV_BYTEORDER_H
> +#define _ASM_RISCV_BYTEORDER_H
> +
> +#if defined(__RISCVEB__)
> +#include <linux/byteorder/big_endian.h>
> +#else
> +#include <linux/byteorder/little_endian.h>
> +#endif
> +
> +#endif /* _ASM_RISCV_BYTEORDER_H */
> diff --git a/arch/riscv/include/asm/common.h b/arch/riscv/include/asm/common.h
> new file mode 100644
> index 000000000..bc8a17e30
> --- /dev/null
> +++ b/arch/riscv/include/asm/common.h
> @@ -0,0 +1,6 @@
> +#ifndef ASM_RISCV_COMMON_H
> +#define ASM_RISCV_COMMON_H
> +
> +/* nothing special yet */
> +
> +#endif /* ASM_RISCV_COMMON_H */
> diff --git a/arch/riscv/include/asm/elf.h b/arch/riscv/include/asm/elf.h
> new file mode 100644
> index 000000000..7134fa058
> --- /dev/null
> +++ b/arch/riscv/include/asm/elf.h
> @@ -0,0 +1,11 @@
> +#ifndef __ASM_RISCV_ELF_H__
> +#define __ASM_RISCV_ELF_H__
> +
> +#if __SIZEOF_POINTER__ == 8
> +#define ELF_CLASS	ELFCLASS64
> +#define CONFIG_PHYS_ADDR_T_64BIT
> +#else
> +#define ELF_CLASS	ELFCLASS32
> +#endif
> +
> +#endif /* __ASM_RISCV_ELF_H__ */
> diff --git a/arch/riscv/include/asm/io.h b/arch/riscv/include/asm/io.h
> new file mode 100644
> index 000000000..3cdea7fca
> --- /dev/null
> +++ b/arch/riscv/include/asm/io.h
> @@ -0,0 +1,8 @@
> +#ifndef __ASM_RISCV_IO_H
> +#define __ASM_RISCV_IO_H
> +
> +#define IO_SPACE_LIMIT 0
> +
> +#include <asm-generic/io.h>
> +
> +#endif /* __ASM_RISCV_IO_H */
> diff --git a/arch/riscv/include/asm/mmu.h b/arch/riscv/include/asm/mmu.h
> new file mode 100644
> index 000000000..95af87142
> --- /dev/null
> +++ b/arch/riscv/include/asm/mmu.h
> @@ -0,0 +1,6 @@
> +#ifndef __ASM_MMU_H
> +#define __ASM_MMU_H
> +
> +#define MAP_ARCH_DEFAULT MAP_UNCACHED
> +
> +#endif /* __ASM_MMU_H */
> diff --git a/arch/riscv/include/asm/posix_types.h b/arch/riscv/include/asm/posix_types.h
> new file mode 100644
> index 000000000..22cae6230
> --- /dev/null
> +++ b/arch/riscv/include/asm/posix_types.h
> @@ -0,0 +1 @@
> +#include <asm-generic/posix_types.h>
> diff --git a/arch/riscv/include/asm/sections.h b/arch/riscv/include/asm/sections.h
> new file mode 100644
> index 000000000..2b8c51603
> --- /dev/null
> +++ b/arch/riscv/include/asm/sections.h
> @@ -0,0 +1 @@
> +#include <asm-generic/sections.h>
> diff --git a/arch/riscv/include/asm/string.h b/arch/riscv/include/asm/string.h
> new file mode 100644
> index 000000000..2997587d8
> --- /dev/null
> +++ b/arch/riscv/include/asm/string.h
> @@ -0,0 +1 @@
> +/* dummy */
> diff --git a/arch/riscv/include/asm/swab.h b/arch/riscv/include/asm/swab.h
> new file mode 100644
> index 000000000..60a90120b
> --- /dev/null
> +++ b/arch/riscv/include/asm/swab.h
> @@ -0,0 +1,6 @@
> +#ifndef _ASM_SWAB_H
> +#define _ASM_SWAB_H
> +
> +/* nothing. use generic functions */
> +
> +#endif /* _ASM_SWAB_H */
> diff --git a/arch/riscv/include/asm/types.h b/arch/riscv/include/asm/types.h
> new file mode 100644
> index 000000000..ba386ab4c
> --- /dev/null
> +++ b/arch/riscv/include/asm/types.h
> @@ -0,0 +1,60 @@
> +#ifndef __ASM_RISCV_TYPES_H
> +#define __ASM_RISCV_TYPES_H
> +
> +#ifdef __riscv64
> +/*
> + * This is used in dlmalloc. On RISCV64 we need it to be 64 bit
> + */
> +#define INTERNAL_SIZE_T unsigned long
> +
> +/*
> + * This is a Kconfig variable in the Kernel, but we want to detect
> + * this during compile time, so we set it here.
> + */
> +#define CONFIG_PHYS_ADDR_T_64BIT
> +
> +#endif
> +
> +typedef unsigned short umode_t;
> +
> +/*
> + * __xx is ok: it doesn't pollute the POSIX namespace. Use these in the
> + * header files exported to user space
> + */
> +
> +typedef __signed__ char __s8;
> +typedef unsigned char __u8;
> +
> +typedef __signed__ short __s16;
> +typedef unsigned short __u16;
> +
> +typedef __signed__ int __s32;
> +typedef unsigned int __u32;
> +
> +#if defined(__GNUC__) && !defined(__STRICT_ANSI__)
> +typedef __signed__ long long __s64;
> +typedef unsigned long long __u64;
> +#endif
> +
> +/*
> + * These aren't exported outside the kernel to avoid name space clashes
> + */
> +#ifdef __KERNEL__
> +
> +typedef signed char s8;
> +typedef unsigned char u8;
> +
> +typedef signed short s16;
> +typedef unsigned short u16;
> +
> +typedef signed int s32;
> +typedef unsigned int u32;
> +
> +typedef signed long long s64;
> +typedef unsigned long long u64;
> +
> +#include <asm/bitsperlong.h>
> +
> +#endif /* __KERNEL__ */
> +
> +#endif /* __ASM_RISCV_TYPES_H */
> diff --git a/arch/riscv/include/asm/unaligned.h b/arch/riscv/include/asm/unaligned.h
> new file mode 100644
> index 000000000..aaebc0641
> --- /dev/null
> +++ b/arch/riscv/include/asm/unaligned.h
> @@ -0,0 +1,19 @@
> +#ifndef _ASM_RISCV_UNALIGNED_H
> +#define _ASM_RISCV_UNALIGNED_H
> +
> +/*
> + * FIXME: this file is copy-n-pasted from sandbox's unaligned.h
> + */
> +
> +#include <linux/unaligned/access_ok.h>
> +#include <linux/unaligned/generic.h>
> +
> +#if __BYTE_ORDER == __LITTLE_ENDIAN
> +#define get_unaligned __get_unaligned_le
> +#define put_unaligned __put_unaligned_le
> +#else
> +#define get_unaligned __get_unaligned_be
> +#define put_unaligned __put_unaligned_be
> +#endif
> +
> +#endif /* _ASM_RISCV_UNALIGNED_H */
> diff --git a/arch/riscv/lib/.gitignore b/arch/riscv/lib/.gitignore
> new file mode 100644
> index 000000000..d1165788c
> --- /dev/null
> +++ b/arch/riscv/lib/.gitignore
> @@ -0,0 +1 @@
> +barebox.lds
> diff --git a/arch/riscv/lib/Makefile b/arch/riscv/lib/Makefile
> new file mode 100644
> index 000000000..313363c1a
> --- /dev/null
> +++ b/arch/riscv/lib/Makefile
> @@ -0,0 +1,9 @@
> +extra-$(CONFIG_GENERIC_LINKER_SCRIPT) += barebox.lds
> +
> +obj-y += riscv_timer.o
> +
> +obj-$(CONFIG_32BIT) += lshrdi3.o
> +obj-$(CONFIG_32BIT) += ashldi3.o
> +obj-$(CONFIG_32BIT) += ashrdi3.o
> +
> +obj-$(CONFIG_BUILTIN_DTB) += dtb.o
> diff --git a/arch/riscv/lib/ashldi3.c b/arch/riscv/lib/ashldi3.c
> new file mode 100644
> index 000000000..cbdbcbb6a
> --- /dev/null
> +++ b/arch/riscv/lib/ashldi3.c
> @@ -0,0 +1,28 @@
> +#include <module.h>
> +
> +#include "libgcc.h"
> +
> +long long __ashldi3(long long u, word_type b)
> +{
> +	DWunion uu, w;
> +	word_type bm;
> +
> +	if (b == 0)
> +		return u;
> +
> +	uu.ll = u;
> +	bm = 32 - b;
> +
> +	if (bm <= 0) {
> +		w.s.low = 0;
> +		w.s.high = (unsigned int) uu.s.low << -bm;
> +	} else {
> +		const unsigned int carries = (unsigned int) uu.s.low >> bm;
> +
> +		w.s.low = (unsigned int) uu.s.low << b;
> +		w.s.high = ((unsigned int) uu.s.high << b) | carries;
> +	}
> +
> +	return w.ll;
> +}
> +EXPORT_SYMBOL(__ashldi3);
> diff --git a/arch/riscv/lib/ashrdi3.c b/arch/riscv/lib/ashrdi3.c
> new file mode 100644
> index 000000000..928d6d97c
> --- /dev/null
> +++ b/arch/riscv/lib/ashrdi3.c
> @@ -0,0 +1,30 @@
> +#include <module.h>
> +
> +#include "libgcc.h"
> +
> +long long __ashrdi3(long long u, word_type b)
> +{
> +	DWunion uu, w> +	word_type bm;
> +
> +	if (b == 0)
> +		return u;
> +
> +	uu.ll = u;
> +	bm = 32 - b;
> +
> +	if (bm <= 0) {
> +		/* w.s.high = 1..1 or 0..0 */
> +		w.s.high =
> +		    uu.s.high >> 31;
> +		w.s.low = uu.s.high >> -bm;
> +	} else {
> +		const unsigned int carries = (unsigned int) uu.s.high << bm;
> +
> +		w.s.high = uu.s.high >> b;
> +		w.s.low = ((unsigned int) uu.s.low >> b) | carries;
> +	}
> +
> +	return w.ll;
> +}
> +EXPORT_SYMBOL(__ashrdi3);
> diff --git a/arch/riscv/lib/asm-offsets.c b/arch/riscv/lib/asm-offsets.c
> new file mode 100644
> index 000000000..22f382b71
> --- /dev/null
> +++ b/arch/riscv/lib/asm-offsets.c
> @@ -0,0 +1,12 @@
> +/*
> + * Generate definitions needed by assembly language modules.
> + * This code generates raw asm output which is post-processed to extract
> + * and format the required data.
> + */
> +
> +#include <linux/kbuild.h>
> +
> +int main(void)
> +{
> +	return 0;
> +}
> diff --git a/arch/riscv/lib/barebox.lds.S b/arch/riscv/lib/barebox.lds.S
> new file mode 100644
> index 000000000..9468fb8b5
> --- /dev/null
> +++ b/arch/riscv/lib/barebox.lds.S
> @@ -0,0 +1,89 @@
> +/*
> + * Copyright (C) 2016 Antony Pavlov <antonynpavlov@gmail.com>
> + *
> + * This file is part of barebox.
> + * See file CREDITS for list of people who contributed to this project.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2
> + * as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + *
> + */
> +
> +#include <asm-generic/barebox.lds.h>
> +
> +OUTPUT_ARCH(riscv)
> +ENTRY(_start)
> +SECTIONS
> +{
> +	. = TEXT_BASE;
> +
> +	. = ALIGN(8);
> +	.text      :
> +	{
> +		_stext = .;
> +		_start = .;
> +		KEEP(*(.text_entry*))
> +		_text = .;
> +		__bare_init_start = .;
> +		*(.text_bare_init*)
> +		__bare_init_end = .;
> +		*(.text*)
> +	}
> +	BAREBOX_BARE_INIT_SIZE
> +
> +	PRE_IMAGE
> +
> +	. = ALIGN(8);
> +	.rodata : { *(.rodata*) }
> +
> +	_etext = .;			/* End of text and rodata section */
> +	_sdata = .;
> +
> +	. = ALIGN(8);
> +	.data : { *(.data*) }
> +
> +	.barebox_imd : { BAREBOX_IMD }
> +
> +	. = ALIGN(8);
> +	.got : { *(.got*) }
> +
> +	. = .;
> +	__barebox_cmd_start = .;
> +	.barebox_cmd : { BAREBOX_CMDS }
> +	__barebox_cmd_end = .;
> +
> +	__barebox_magicvar_start = .;
> +	.barebox_magicvar : { BAREBOX_MAGICVARS }
> +	__barebox_magicvar_end = .;
> +
> +	__barebox_initcalls_start = .;
> +	.barebox_initcalls : { INITCALLS }
> +	__barebox_initcalls_end = .;
> +
> +	__barebox_exitcalls_start = .;
> +	.barebox_exitcalls : { EXITCALLS }
> +	__barebox_exitcalls_end = .;
> +
> +	__usymtab_start = .;
> +	__usymtab : { BAREBOX_SYMS }
> +	__usymtab_end = .;
> +
> +	.rela.dyn : { *(.rela*) }
> +
> +	.oftables : { BAREBOX_CLK_TABLE() }
> +
> +	.dtb : { BAREBOX_DTB() }
> +
> +	_edata = .;
> +	. = ALIGN(8);
> +	__bss_start = .;
> +	.bss : { *(.bss*) *(.sbss*) }
> +	__bss_stop = .;
> +	_end = .;
> +}
> diff --git a/arch/riscv/lib/dtb.c b/arch/riscv/lib/dtb.c
> new file mode 100644
> index 000000000..09f519dcc
> --- /dev/null
> +++ b/arch/riscv/lib/dtb.c
> @@ -0,0 +1,41 @@
> +/*
> + * Copyright (C) 2016 Antony Pavlov <antonynpavlov@gmail.com>
> + *
> + * See file CREDITS for list of people who contributed to this
> + * project.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2
> + * as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + *
> + */
> +#include <common.h>
> +#include <init.h>
> +#include <of.h>
> +
> +extern char __dtb_start[];
> +
> +static int of_riscv_init(void)
> +{
> +	struct device_node *root;
> +
> +	root = of_get_root_node();
> +	if (root)
> +		return 0;
> +
> +	root = of_unflatten_dtb(__dtb_start);
> +	if (!IS_ERR(root)) {
> +		pr_debug("using internal DTB\n");
> +		of_set_root_node(root);
> +		if (IS_ENABLED(CONFIG_OFDEVICE))
> +			of_probe();
> +	}
> +
> +	return 0;
> +}
> +core_initcall(of_riscv_init);
> diff --git a/arch/riscv/lib/libgcc.h b/arch/riscv/lib/libgcc.h
> new file mode 100644
> index 000000000..593e59802
> --- /dev/null
> +++ b/arch/riscv/lib/libgcc.h
> @@ -0,0 +1,29 @@
> +#ifndef __ASM_LIBGCC_H
> +#define __ASM_LIBGCC_H
> +
> +#include <asm/byteorder.h>
> +
> +typedef int word_type __attribute__ ((mode (__word__)));
> +#ifdef __BIG_ENDIAN
> +struct DWstruct {
> +	int high, low;
> +};
> +#elif defined(__LITTLE_ENDIAN)
> +struct DWstruct {
> +	int low, high;
> +};
> +#else
> +#error I feel sick.
> +#endif
> +
> +typedef union {
> +	struct DWstruct s;
> +	long long ll;
> +} DWunion;
> +
> +long long __lshrdi3(long long u, word_type b);
> +long long __ashldi3(long long u, word_type b);
> +long long __ashrdi3(long long u, word_type b);
> +
> +#endif /* __ASM_LIBGCC_H */
> diff --git a/arch/riscv/lib/lshrdi3.c b/arch/riscv/lib/lshrdi3.c
> new file mode 100644
> index 000000000..74a4846e9
> --- /dev/null
> +++ b/arch/riscv/lib/lshrdi3.c
> @@ -0,0 +1,28 @@
> +#include <module.h>
> +
> +#include "libgcc.h"
> +
> +long long __lshrdi3(long long u, word_type b)
> +{
> +	DWunion uu, w;
> +	word_type bm;
> +
> +	if (b == 0)
> +		return u;
> +
> +	uu.ll = u;
> +	bm = 32 - b;
> +
> +	if (bm <= 0) {
> +		w.s.high = 0;
> +		w.s.low = (unsigned int) uu.s.high >> -bm;
> +	} else {
> +		const unsigned int carries = (unsigned int) uu.s.high << bm;
> +
> +		w.s.high = (unsigned int) uu.s.high >> b;
> +		w.s.low = ((unsigned int) uu.s.low >> b) | carries;
> +	}
> +
> +	return w.ll;
> +}
> +EXPORT_SYMBOL(__lshrdi3);
> diff --git a/arch/riscv/lib/riscv_timer.c b/arch/riscv/lib/riscv_timer.c
> new file mode 100644
> index 000000000..46181f877
> --- /dev/null
> +++ b/arch/riscv/lib/riscv_timer.c
> @@ -0,0 +1,68 @@
> +/*
> + * Copyright (C) 2017 Antony Pavlov <antonynpavlov@gmail.com>
> + *
> + * This file is part of barebox.
> + * See file CREDITS for list of people who contributed to this project.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2
> + * as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + *
> + */
> +
> +/**
> + * @file
> + * @brief Clocksource based on RISCV cycle CSR timer
> + */
> +
> +#include <init.h>
> +#include <of.h>
> +#include <linux/clk.h>
> +#include <clock.h>
> +#include <io.h>
> +
> +static uint64_t rdcycle_read(void)
> +{
> +	register unsigned long __v;
> +
> +	__asm__ __volatile__ ("rdcycle %0" : "=r" (__v));
> +
> +	return __v;
> +}
> +
> +static struct clocksource rdcycle_cs = {
> +	.read	= rdcycle_read,
> +	.mask	= CLOCKSOURCE_MASK(32),
> +};
> +
> +static int rdcycle_cs_init(void)
> +{
> +	unsigned int cycle_frequency;
> +
> +	/* default rate: 100 MHz */
> +	cycle_frequency = 100000000;
> +
> +	if (IS_ENABLED(CONFIG_OFTREE)) {
> +		struct device_node *np;
> +		struct clk *clk;
> +
> +		np = of_get_cpu_node(0, NULL);
> +		if (np) {
> +			clk = of_clk_get(np, 0);
> +			if (!IS_ERR(clk)) {
> +				cycle_frequency = clk_get_rate(clk);
> +			}
> +		}
> +	}
> +
> +	clocks_calc_mult_shift(&rdcycle_cs.mult, &rdcycle_cs.shift,
> +		cycle_frequency, NSEC_PER_SEC, 10);
> +
> +	return init_clock(&rdcycle_cs);
> +}
> +postcore_initcall(rdcycle_cs_init);
> diff --git a/drivers/of/Kconfig b/drivers/of/Kconfig
> index a1fac0e61..24cf4465a 100644
> --- a/drivers/of/Kconfig
> +++ b/drivers/of/Kconfig
> @@ -4,7 +4,7 @@ config OFTREE
>  
>  config OFTREE_MEM_GENERIC
>  	depends on OFTREE
> -	depends on PPC || ARM || EFI_BOOTUP || OPENRISC || SANDBOX
> +	depends on PPC || ARM || EFI_BOOTUP || OPENRISC || SANDBOX || RISCV
>  	def_bool y
>  
>  config DTC
> 


-- 
Regards,
Oleksij


[-- Attachment #1.2: OpenPGP digital signature --]
[-- Type: application/pgp-signature, Size: 195 bytes --]

[-- Attachment #2: Type: text/plain, Size: 149 bytes --]

_______________________________________________
barebox mailing list
barebox@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/barebox

Re: [RFC v4 01/10] Add initial RISC-V architecture support

[Antony Pavlov]

On Fri, 29 Sep 2017 14:07:09 +0200
Oleksij Rempel <linux@rempel-privat.de> wrote:

> Hi,
> 
> hm... mostly looks identical with existing arch

What do you mean when you say "existing arch"?

...

> Am 29.09.2017 um 01:12 schrieb Antony Pavlov:
...
> > diff --git a/arch/riscv/boot/start.S b/arch/riscv/boot/start.S
> > new file mode 100644
> > index 000000000..2fd00f63d
> > --- /dev/null
> > +++ b/arch/riscv/boot/start.S
> > @@ -0,0 +1,74 @@
> > +/*
> > + * Startup Code for MIPS CPU
> > + *
> > + * based on coreboot/src/arch/riscv/bootblock.S
> > + *
> > + * Copyright (C) 2016 Antony Pavlov <antonynpavlov@gmail.com>
> > + *
> > + * This file is part of barebox.
> > + * See file CREDITS for list of people who contributed to this project.
> > + *
> > + * This program is free software; you can redistribute it and/or modify
> > + * it under the terms of the GNU General Public License version 2
> > + * as published by the Free Software Foundation.
> > + *
> > + * This program is distributed in the hope that it will be useful,
> > + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> > + * GNU General Public License for more details.
> > + *
> > + */
> > +
> > +#include <asm-generic/memory_layout.h>
> > +
> > +	.text
> > +	.section ".text_entry"
> > +	.align 2
> > +
> > +.globl _start
> > +_start:
> > +	li sp, STACK_BASE + STACK_SIZE
> > +
> > +	# make room for HLS and initialize it
> > +	addi sp, sp, -64 /* MENTRY_FRAME_SIZE */
> > +
> > +	# poison the stack
> > +	li t1, STACK_BASE
> > +	li t0, 0xdeadbeef
> > +	sw t0, 0(t1)
> > +
> > +	# clear any pending interrupts
> > +	//csrwi mip, 0
> 
> should be removed.

Actually not!

I have imported this code from coreboot.

I have commented this line because csrwi does not worked in some cases.

But I have to make additional investigations on csrwi.

> 
> > +	/* copy barebox to link location */
> > +
> > +	la	a0, _start	/* a0 <- _start actual address */
> > +	li	a1, CONFIG_TEXT_BASE	/* a1 <- _start link address */
> > +
> > +	beq	a0, a1, main_entry
> > +
> > +	la	a2, __bss_start
> > +
> > +#define LONGSIZE 4
> > +
> > +copy_loop:
> > +	/* copy from source address [a0] */
> > +	lw	t0, LONGSIZE * 0(a0)
> > +	lw	t1, LONGSIZE * 1(a0)
> > +	lw	t2, LONGSIZE * 2(a0)
> > +	lw	t3, LONGSIZE * 3(a0)
> > +	/* copy to target address [a1] */
> > +	sw	t0, LONGSIZE * 0(a1)
> > +	sw	t1, LONGSIZE * 1(a1)
> > +	sw	t2, LONGSIZE * 2(a1)
> > +	sw	t3, LONGSIZE * 3(a1)
> > +	addi	a0, a0, LONGSIZE * 2
> > +	addi	a1, a1, LONGSIZE * 2
> > +	bgeu	a2, a0, copy_loop
> > +
> > +	/* Alas! At the moment I can't load main_entry __link__ address
> > +	   into a0 with la. Use CONFIG_TEXT_BASE instead. This solution
> > +	   leads to extra cycles for repeat sp initialization. */
> > +
> > +	li	a0, CONFIG_TEXT_BASE
> > +	jalr	a0
> > diff --git a/arch/riscv/dts/.gitignore b/arch/riscv/dts/.gitignore
> > new file mode 100644
> > index 000000000..077903c50
> > --- /dev/null
> > +++ b/arch/riscv/dts/.gitignore
> > @@ -0,0 +1 @@
> > +*dtb*
> > diff --git a/arch/riscv/dts/Makefile b/arch/riscv/dts/Makefile
> > new file mode 100644
> > index 000000000..f8380b11c
> > --- /dev/null
> > +++ b/arch/riscv/dts/Makefile
> > @@ -0,0 +1,9 @@
> > +BUILTIN_DTB := $(patsubst "%",%,$(CONFIG_BUILTIN_DTB_NAME))
> > +obj-$(CONFIG_BUILTIN_DTB) += $(BUILTIN_DTB).dtb.o
> > +
> > +# just to build a built-in.o. Otherwise compilation fails when no devicetree is
> > +# created.
> > +obj- += dummy.o
> > +
> > +always := $(dtb-y)
> > +clean-files := *.dtb *.dtb.S .*.dtc .*.pre .*.dts
> > diff --git a/arch/riscv/dts/skeleton.dtsi b/arch/riscv/dts/skeleton.dtsi
> > new file mode 100644
> > index 000000000..38ead821b
> > --- /dev/null
> > +++ b/arch/riscv/dts/skeleton.dtsi
> > @@ -0,0 +1,13 @@
> > +/*
> > + * Skeleton device tree; the bare minimum needed to boot; just include and
> > + * add a compatible value.  The bootloader will typically populate the memory
> > + * node.
> > + */
> > +
> > +/ {
> > +	#address-cells = <2>;
> > +	#size-cells = <1>;
> > +	chosen { };
> > +	aliases { };
> > +	memory { device_type = "memory"; reg = <0 0 0>; };
> 
> "reg = <0 0>" instead?

no.

We have

  #address-cells = <2>;
  #size-cells = <1>;

here.

-- 
Best regards,
  Antony Pavlov

_______________________________________________
barebox mailing list
barebox@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/barebox

Re: [RFC v4 01/10] Add initial RISC-V architecture support

[Oleksij Rempel]

[-- Attachment #1.1.1: Type: text/plain, Size: 848 bytes --]

Hi,

Am 30.09.2017 um 13:57 schrieb Antony Pavlov:
> On Fri, 29 Sep 2017 14:07:09 +0200
> Oleksij Rempel <linux@rempel-privat.de> wrote:
> 
>> Hi,
>>
>> hm... mostly looks identical with existing arch
> 
> What do you mean when you say "existing arch"?

it is a note for me. I just compared it with MIPS
> ...
> 
>> Am 29.09.2017 um 01:12 schrieb Antony Pavlov:
> ...
>>> diff --git a/arch/riscv/boot/start.S b/arch/riscv/boot/start.S
>>> new file mode 100644
>>> index 000000000..2fd00f63d
>>> --- /dev/null
>>> +++ b/arch/riscv/boot/start.S
>>> @@ -0,0 +1,74 @@
>>> +/*
>>> + * Startup Code for MIPS CPU

Beside here is a copy paste ^^^ artefact :)

>>> + * based on coreboot/src/arch/riscv/bootblock.S
>>> + *
>>> + * Copyright (C) 2016 Antony Pavlov <antonynpavlov@gmail.com>
>>> + *

-- 
Regards,
Oleksij


[-- Attachment #1.2: OpenPGP digital signature --]
[-- Type: application/pgp-signature, Size: 213 bytes --]

[-- Attachment #2: Type: text/plain, Size: 149 bytes --]

_______________________________________________
barebox mailing list
barebox@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/barebox

Re: [RFC v4 01/10] Add initial RISC-V architecture support

[Antony Pavlov]

On Mon, 2 Oct 2017 09:43:02 +0200
Oleksij Rempel <linux@rempel-privat.de> wrote:

> Hi,
> 
> Am 30.09.2017 um 13:57 schrieb Antony Pavlov:
> > On Fri, 29 Sep 2017 14:07:09 +0200
> > Oleksij Rempel <linux@rempel-privat.de> wrote:
> > 
> >> Hi,
> >>
> >> hm... mostly looks identical with existing arch
> > 
> > What do you mean when you say "existing arch"?
> 
> it is a note for me. I just compared it with MIPS
> > ...
> > 
> >> Am 29.09.2017 um 01:12 schrieb Antony Pavlov:
> > ...
> >>> diff --git a/arch/riscv/boot/start.S b/arch/riscv/boot/start.S
> >>> new file mode 100644
> >>> index 000000000..2fd00f63d
> >>> --- /dev/null
> >>> +++ b/arch/riscv/boot/start.S
> >>> @@ -0,0 +1,74 @@
> >>> +/*
> >>> + * Startup Code for MIPS CPU
> 
> Beside here is a copy paste ^^^ artefact :)

Thanks! I have just fixed this.

> 
> >>> + * based on coreboot/src/arch/riscv/bootblock.S
> >>> + *
> >>> + * Copyright (C) 2016 Antony Pavlov <antonynpavlov@gmail.com>
> >>> + *

-- 
Best regards,
  Antony Pavlov

_______________________________________________
barebox mailing list
barebox@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/barebox

Re: [RFC v4 01/10] Add initial RISC-V architecture support

[Daniel Schultz]

Hi,


On 09/30/2017 01:57 PM, Antony Pavlov wrote:
> On Fri, 29 Sep 2017 14:07:09 +0200
> Oleksij Rempel <linux@rempel-privat.de> wrote:
>
>> Hi,
>>
>> hm... mostly looks identical with existing arch
> What do you mean when you say "existing arch"?
>
> ...
>
>> Am 29.09.2017 um 01:12 schrieb Antony Pavlov:
> ...
>>> diff --git a/arch/riscv/boot/start.S b/arch/riscv/boot/start.S
>>> new file mode 100644
>>> index 000000000..2fd00f63d
>>> --- /dev/null
>>> +++ b/arch/riscv/boot/start.S
>>> @@ -0,0 +1,74 @@
>>> +/*
>>> + * Startup Code for MIPS CPU
>>> + *
>>> + * based on coreboot/src/arch/riscv/bootblock.S
>>> + *
>>> + * Copyright (C) 2016 Antony Pavlov <antonynpavlov@gmail.com>
>>> + *
>>> + * This file is part of barebox.
>>> + * See file CREDITS for list of people who contributed to this project.
>>> + *
>>> + * This program is free software; you can redistribute it and/or modify
>>> + * it under the terms of the GNU General Public License version 2
>>> + * as published by the Free Software Foundation.
>>> + *
>>> + * This program is distributed in the hope that it will be useful,
>>> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
>>> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
>>> + * GNU General Public License for more details.
>>> + *
>>> + */
>>> +
>>> +#include <asm-generic/memory_layout.h>
>>> +
>>> +	.text
>>> +	.section ".text_entry"
>>> +	.align 2
>>> +
>>> +.globl _start
>>> +_start:
>>> +	li sp, STACK_BASE + STACK_SIZE
>>> +
>>> +	# make room for HLS and initialize it
>>> +	addi sp, sp, -64 /* MENTRY_FRAME_SIZE */
>>> +
>>> +	# poison the stack
>>> +	li t1, STACK_BASE
>>> +	li t0, 0xdeadbeef
>>> +	sw t0, 0(t1)
>>> +
>>> +	# clear any pending interrupts
>>> +	//csrwi mip, 0
>> should be removed.
> Actually not!
>
> I have imported this code from coreboot.
>
> I have commented this line because csrwi does not worked in some cases.
>
> But I have to make additional investigations on csrwi.
>
CSRRWI is part of the base integer instruction set and the machine mode 
is mandatory. If there are troubles with this instruction, the core has 
a faulty design. So executing this line should be okay even if there is 
no interrupt controller.

-- 
Mit freundlichen Grüßen,
With best regards,
   Daniel Schultz


_______________________________________________
barebox mailing list
barebox@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/barebox

Re: [RFC v4 01/10] Add initial RISC-V architecture support

[Antony Pavlov]

On Mon, 2 Oct 2017 12:04:30 +0200
Daniel Schultz <d.schultz@phytec.de> wrote:

> Hi,
> 
> 
> On 09/30/2017 01:57 PM, Antony Pavlov wrote:
> > On Fri, 29 Sep 2017 14:07:09 +0200
> > Oleksij Rempel <linux@rempel-privat.de> wrote:
> >
> >> Hi,
> >>
> >> hm... mostly looks identical with existing arch
> > What do you mean when you say "existing arch"?
> >
> > ...
> >
> >> Am 29.09.2017 um 01:12 schrieb Antony Pavlov:
> > ...
> >>> diff --git a/arch/riscv/boot/start.S b/arch/riscv/boot/start.S
> >>> new file mode 100644
> >>> index 000000000..2fd00f63d
> >>> --- /dev/null
> >>> +++ b/arch/riscv/boot/start.S
> >>> @@ -0,0 +1,74 @@
> >>> +/*
> >>> + * Startup Code for MIPS CPU
> >>> + *
> >>> + * based on coreboot/src/arch/riscv/bootblock.S
> >>> + *
> >>> + * Copyright (C) 2016 Antony Pavlov <antonynpavlov@gmail.com>
> >>> + *
> >>> + * This file is part of barebox.
> >>> + * See file CREDITS for list of people who contributed to this project.
> >>> + *
> >>> + * This program is free software; you can redistribute it and/or modify
> >>> + * it under the terms of the GNU General Public License version 2
> >>> + * as published by the Free Software Foundation.
> >>> + *
> >>> + * This program is distributed in the hope that it will be useful,
> >>> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> >>> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> >>> + * GNU General Public License for more details.
> >>> + *
> >>> + */
> >>> +
> >>> +#include <asm-generic/memory_layout.h>
> >>> +
> >>> +	.text
> >>> +	.section ".text_entry"
> >>> +	.align 2
> >>> +
> >>> +.globl _start
> >>> +_start:
> >>> +	li sp, STACK_BASE + STACK_SIZE
> >>> +
> >>> +	# make room for HLS and initialize it
> >>> +	addi sp, sp, -64 /* MENTRY_FRAME_SIZE */
> >>> +
> >>> +	# poison the stack
> >>> +	li t1, STACK_BASE
> >>> +	li t0, 0xdeadbeef
> >>> +	sw t0, 0(t1)
> >>> +
> >>> +	# clear any pending interrupts
> >>> +	//csrwi mip, 0
> >> should be removed.
> > Actually not!
> >
> > I have imported this code from coreboot.
> >
> > I have commented this line because csrwi does not worked in some cases.
> >
> > But I have to make additional investigations on csrwi.
> >
> CSRRWI is part of the base integer instruction set and the machine mode 
> is mandatory. If there are troubles with this instruction, the core has 
> a faulty design. So executing this line should be okay even if there is 
> no interrupt controller.
> 

It's not a bug, it's a feature :)

At the moment I use picorv32 core.

Here is a quote from https://github.com/cliffordwolf/picorv32#custom-instructions-for-irq-handling

     The IRQ handling features in PicoRV32 do not follow the RISC-V Privileged ISA specification.
     Instead a small set of very simple custom instructions is used to implement IRQ handling with
     minimal hardware overhead.

I'm planning to make it possible to use another core instead of picorv32 in Eriso SoC,
so I can introduce something like SYS_HAS_PICORV32_CPU Kconfig macro.

> -- 
> Mit freundlichen Grüßen,
> With best regards,
>    Daniel Schultz
> 
> 
> _______________________________________________
> barebox mailing list
> barebox@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/barebox


-- 
Best regards,
  Antony Pavlov

_______________________________________________
barebox mailing list
barebox@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/barebox

Re: [RFC v4 01/10] Add initial RISC-V architecture support

[Daniel Schultz]

Hi,


On 09/29/2017 02:07 PM, Oleksij Rempel wrote:
> Hi,
>
> hm... mostly looks identical with existing arch
>
> Am 29.09.2017 um 01:12 schrieb Antony Pavlov:
>> Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
>> --
>> TODOs:
>>
>>    * split patch;
>> ---
>>   arch/riscv/Kconfig                   | 73 +++++++++++++++++++++++++++++
>>   arch/riscv/Makefile                  | 68 +++++++++++++++++++++++++++
>>   arch/riscv/boot/Makefile             |  2 +
>>   arch/riscv/boot/main_entry.c         | 40 ++++++++++++++++
>>   arch/riscv/boot/start.S              | 74 ++++++++++++++++++++++++++++++
>>   arch/riscv/dts/.gitignore            |  >  arch/riscv/dts/Makefile              |  9 ++++
>>   arch/riscv/dts/skeleton.dtsi         | 13 ++++++
>>   arch/riscv/include/asm/barebox.h     |  1 +
>>   arch/riscv/include/asm/bitops.h      | 35 ++++++++++++++
>>   arch/riscv/include/asm/bitsperlong.h | 10 ++++
>>   arch/riscv/include/asm/byteorder.h   | 10 ++++
>>   arch/riscv/include/asm/common.h      |  6 +++
>>   arch/riscv/include/asm/elf.h         | 11 +++++
>>   arch/riscv/include/asm/io.h          |  8 ++++
>>   arch/riscv/include/asm/mmu.h         |  6 +++
>>   arch/riscv/include/asm/posix_types.h |  1 +
>>   arch/riscv/include/asm/sections.h    |  1 +
>>   arch/riscv/include/asm/string.h      |  1 +
>>   arch/riscv/include/asm/swab.h        |  6 +++
>>   arch/riscv/include/asm/types.h       | 60 ++++++++++++++++++++++++
>>   arch/riscv/include/asm/unaligned.h   | 19 ++++++++
>>   arch/riscv/lib/.gitignore            |  1 +
>>   arch/riscv/lib/Makefile              |  9 ++++
>>   arch/riscv/lib/ashldi3.c             | 28 ++++++++++++
>>   arch/riscv/lib/ashrdi3.c             | 30 ++++++++++++
>>   arch/riscv/lib/asm-offsets.c         | 12 +++++
>>   arch/riscv/lib/barebox.lds.S         | 89 ++++++++++++++++++++++++++++++++++++
>>   arch/riscv/lib/dtb.c                 | 41 +++++++++++++++++
>>   arch/riscv/lib/libgcc.h              | 29 ++++++++++++
>>   arch/riscv/lib/lshrdi3.c             | 28 ++++++++++++
>>   arch/riscv/lib/riscv_timer.c         | 68 +++++++++++++++++++++++++++
>>   drivers/of/Kconfig                   |  2 +-
>>   33 files changed, 791 insertions(+), 1 deletion(-)
>>
>> diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
>> new file mode 100644
>> index 000000000..b2f0817ef
>> --- /dev/null
>> +++ b/arch/riscv/Kconfig
>> @@ -0,0 +1,73 @@
>> +config RISCV
>> +	bool
>> +	select GENERIC_FIND_NEXT_BIT
>> +	select HAVE_CONFIGURABLE_MEMORY_LAYOUT
>> +	select HAVE_CONFIGURABLE_TEXT_BASE
>> +	select GPIOLIB
>> +	select OFTREE
>> +	select COMMON_CLK
>> +	select COMMON_CLK_OF_PROVIDER
>> +	select CLKDEV_LOOKUP
>> +	default y
>> +
>> +config ARCH_TEXT_BASE
>> +	hex
>> +	default 0x0
>> +
>> +config GENERIC_LINKER_SCRIPT
>> +	bool
>> +	default y
>> +
>> +menu "Machine selection"
>> +
>> +choice
>> +	prompt "CPU selection"
>> +	default CPU_RV_GENERIC
>> +
>> +config CPU_RV_GENERIC
>> +	bool "Generic RISC-V"
>> +	select CPU_SUPPORTS_32BIT_KERNEL
>> +	select CPU_SUPPORTS_64BIT_KERNEL
>> +
>> +endchoice
>> +
>> +config CPU_SUPPORTS_32BIT_KERNEL
>> +	bool
>> +config CPU_SUPPORTS_64BIT_KERNEL
>> +	bool
>> +
>> +choice
>> +	prompt "barebox code model"
>> +	default 64BIT
>> +
>> +config 32BIT
>> +	bool "32-bit barebox"
>> +	depends on CPU_SUPPORTS_32BIT_KERNEL
>> +	help
>> +	  Select this option to build a 32-bit barebox.
>> +
>> +config 64BIT
>> +	bool "64-bit barebox"
>> +	depends on CPU_SUPPORTS_64BIT_KERNEL
>> +	help
>> +	  Select this option to build a 64-bit barebox.
>> +
>> +endchoice
>> +
>> +config BUILTIN_DTB
>> +	bool "link a DTB into the barebox image"
>> +	depends on OFTREE
>> +
>> +config BUILTIN_DTB_NAME
>> +	string "DTB to build into the barebox image"
>> +	depends on BUILTIN_DTB
>> +
>> +endmenu
>> +
>> +source common/Kconfig
>> +source commands/Kconfig
>> +source net/Kconfig
>> +source drivers/Kconfig
>> +source fs/Kconfig
>> +source lib/Kconfig
>> +source crypto/Kconfig
>> diff --git a/arch/riscv/Makefile b/arch/riscv/Makefile
>> new file mode 100644
>> index 000000000..4e3318cf1
>> --- /dev/null
>> +++ b/arch/riscv/Makefile
>> @@ -0,0 +1,68 @@
>> +CPPFLAGS += -fno-strict-aliasing
>> +
>> +cflags-y += -fno-pic -pipe
>> +cflags-y += -Wall -Wmissing-prototypes -Wstrict-prototypes \
>> +	-Wno-uninitialized -Wno-format -Wno-main -mcmodel=medany
>> +
>> +LDFLAGS += $(ldflags-y)
>> +LDFLAGS_barebox += -nostdlib
>> +
>> +TEXT_BASE = $(CONFIG_TEXT_BASE)
>> +CPPFLAGS += -DTEXT_BASE=$(CONFIG_TEXT_BASE)
>> +
>> +ifndef CONFIG_MODULES
>> +# Add cleanup flags
>> +CPPFLAGS += -fdata-sections -ffunction-sections
>> +LDFLAGS_barebox += -static --gc-sections
>> +endif
>> +
>> +KBUILD_BINARY := barebox.bin
>> +
>> +machdirs := $(patsubst %,arch/riscv/mach-%/,$(machine-y))
>> +
>> +ifneq ($(board-y),)
>> +BOARD := arch/riscv/boards/$(board-y)/
>> +else
>> +BOARD :=
>> +endif
>> +
>> +ifeq ($(KBUILD_SRC),)
>> +CPPFLAGS += -I$(BOARD)/include
>> +else
>> +CPPFLAGS += -I$(srctree)/$(BOARD)/include
>> +endif
>> +
>> +ifeq ($(KBUILD_SRC),)
>> +CPPFLAGS += $(patsubst %,-I%include,$(machdirs))
>> +else
>> +CPPFLAGS += $(patsubst %,-I$(srctree)/%include,$(machdirs))
>> +endif
>> +
>> +archprepare: maketools
>> +
>> +PHONY += maketools
>> +
>> +ifneq ($(machine-y),)
>> +MACH  := arch/riscv/mach-$(machine-y)/
>> +else
>> +MACH  :=
>> +endif
>> +
>> +ifneq ($(board-y),)
>> +BOARD := arch/riscv/boards/$(board-y)/
>> +else
>> +BOARD :=
>> +endif
>> +
>> +common-y += $(BOARD) $(MACH)
>> +common-y += arch/riscv/lib/
>> +common-y += arch/riscv/boot/
>> +
>> +common-$(CONFIG_OFTREE) += arch/riscv/dts/
>> +
>> +CPPFLAGS += $(cflags-y)
>> +CFLAGS += $(cflags-y)
>> +
>> +lds-y	:= arch/riscv/lib/barebox.lds
>> +
>> +CLEAN_FILES += arch/riscv/lib/barebox.lds
>> diff --git a/arch/riscv/boot/Makefile b/arch/riscv/boot/Makefile
>> new file mode 100644
>> index 000000000..d6d28ce65
>> --- /dev/null
>> +++ b/arch/riscv/boot/Makefile
>> @@ -0,0 +1,2 @@
>> +obj-y += start.o
>> +obj-y += main_entry.o
>> diff --git a/arch/riscv/boot/main_entry.c b/arch/riscv/boot/main_entry.c
>> new file mode 100644
>> index 000000000..18db86da5
>> --- /dev/null
>> +++ b/arch/riscv/boot/main_entry.c
>> @@ -0,0 +1,40 @@
>> +/*
>> + * Copyright (C) 2016 Antony Pavlov <antonynpavlov@gmail.com>
>> + *
>> + * This file is part of barebox.
>> + * See file CREDITS for list of people who contributed to this project.
>> + *
>> + * This program is free software; you can redistribute it and/or
>> + * modify it under the terms of the GNU General Public License as
>> + * published by the Free Software Foundation; either version 2 of
>> + * the License, or (at your option) any later version.
>> + *
>> + * This program is distributed in the hope that it will be useful,
>> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
>> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
>> + * GNU General Public License for more details.
>> + *
>> + */
>> +
>> +#include <common.h>
>> +#include <memory.h>
>> +#include <asm-generic/memory_layout.h>
>> +#include <asm/sections.h>
>> +
>> +void main_entry(void);
>> +
>> +/**
>> + * Called plainly from assembler code
>> + *
>> + * @note The C environment isn't initialized yet
>> + */
>> +void main_entry(void)
>> +{
>> +	/* clear the BSS first */
>> +	memset(__bss_start, 0x00, __bss_stop - __bss_start);
>> +
>> +	mem_malloc_init((void *)MALLOC_BASE,
>> +			(void *)(MALLOC_BASE + MALLOC_SIZE - 1));
>> +
>> +	start_barebox();
>> +}
>> diff --git a/arch/riscv/boot/start.S b/arch/riscv/boot/start.S
>> new file mode 100644
>> index 000000000..2fd00f63d
>> --- /dev/null
>> +++ b/arch/riscv/boot/start.S
>> @@ -0,0 +1,74 @@
>> +/*
>> + * Startup Code for MIPS CPU
>> + *
>> + * based on coreboot/src/arch/riscv/bootblock.S
>> + *
>> + * Copyright (C) 2016 Antony Pavlov <antonynpavlov@gmail.com>
>> + *
>> + * This file is part of barebox.
>> + * See file CREDITS for list of people who contributed to this project.
>> + *
>> + * This program is free software; you can redistribute it and/or modify
>> + * it under the terms of the GNU General Public License version 2
>> + * as published by the Free Software Foundation.
>> + *
>> + * This program is distributed in the hope that it will be useful,
>> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
>> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
>> + * GNU General Public License for more details.
>> + *
>> + */
>> +
>> +#include <asm-generic/memory_layout.h>
>> +
>> +	.text
>> +	.section ".text_entry"
>> +	.align 2
>> +
>> +.globl _start
>> +_start:
>> +	li sp, STACK_BASE + STACK_SIZE
>> +
>> +	# make room for HLS and initialize it
>> +	addi sp, sp, -64 /* MENTRY_FRAME_SIZE */
>> +
>> +	# poison the stack
>> +	li t1, STACK_BASE
>> +	li t0, 0xdeadbeef
>> +	sw t0, 0(t1)
>> +
>> +	# clear any pending interrupts
>> +	//csrwi mip, 0
> should be removed.
>
>> +	/* copy barebox to link location */
>> +
>> +	la	a0, _start	/* a0 <- _start actual address */
>> +	li	a1, CONFIG_TEXT_BASE	/* a1 <- _start link address */
>> +
>> +	beq	a0, a1, main_entry
>> +
>> +	la	a2, __bss_start
>> +
>> +#define LONGSIZE 4
>> +
>> +copy_loop:
>> +	/* copy from source address [a0] */
>> +	lw	t0, LONGSIZE * 0(a0)
>> +	lw	t1, LONGSIZE * 1(a0)
>> +	lw	t2, LONGSIZE * 2(a0)
>> +	lw	t3, LONGSIZE * 3(a0)
>> +	/* copy to target address [a1] */
>> +	sw	t0, LONGSIZE * 0(a1)
>> +	sw	t1, LONGSIZE * 1(a1)
>> +	sw	t2, LONGSIZE * 2(a1)
>> +	sw	t3, LONGSIZE * 3(a1)
>> +	addi	a0, a0, LONGSIZE * 2
>> +	addi	a1, a1, LONGSIZE * 2
>> +	bgeu	a2, a0, copy_loop
>> +
>> +	/* Alas! At the moment I can't load main_entry __link__ address
>> +	   into a0 with la. Use CONFIG_TEXT_BASE instead. This solution
>> +	   leads to extra cycles for repeat sp initialization. */
>> +
>> +	li	a0, CONFIG_TEXT_BASE
>> +	jalr	a0
>> diff --git a/arch/riscv/dts/.gitignore b/arch/riscv/dts/.gitignore
>> new file mode 100644
>> index 000000000..077903c50
>> --- /dev/null
>> +++ b/arch/riscv/dts/.gitignore
>> @@ -0,0 +1 @@
>> +*dtb*
>> diff --git a/arch/riscv/dts/Makefile b/arch/riscv/dts/Makefile
>> new file mode 100644
>> index 000000000..f8380b11c
>> --- /dev/null
>> +++ b/arch/riscv/dts/Makefile
>> @@ -0,0 +1,9 @@
>> +BUILTIN_DTB := $(patsubst "%",%,$(CONFIG_BUILTIN_DTB_NAME))
>> +obj-$(CONFIG_BUILTIN_DTB) += $(BUILTIN_DTB).dtb.o
>> +
>> +# just to build a built-in.o. Otherwise compilation fails when no devicetree is
>> +# created.
>> +obj- += dummy.o
>> +
>> +always := $(dtb-y)
>> +clean-files := *.dtb *.dtb.S .*.dtc .*.pre .*.dts
>> diff --git a/arch/riscv/dts/skeleton.dtsi b/arch/riscv/dts/skeleton.dtsi
>> new file mode 100644
>> index 000000000..38ead821b
>> --- /dev/null
>> +++ b/arch/riscv/dts/skeleton.dtsi
>> @@ -0,0 +1,13 @@
>> +/*
>> + * Skeleton device tree; the bare minimum needed to boot; just include and
>> + * add a compatible value.  The bootloader will typically populate the memory
>> + * node.
>> + */
>> +
>> +/ {
>> +	#address-cells = <2>;
>> +	#size-cells = <1>;
>> +	chosen { };
>> +	aliases { };
>> +	memory { device_type = "memory"; reg = <0 0 0>; };
> "reg = <0 0>" instead?
>
>> +};
>> diff --git a/arch/riscv/include/asm/barebox.h b/arch/riscv/include/asm/barebox.h
>> new file mode 100644
>> index 000000000..2997587d8
>> --- /dev/null
>> +++ b/arch/riscv/include/asm/barebox.h
>> @@ -0,0 +1 @@
>> +/* dummy */
>> diff --git a/arch/riscv/include/asm/bitops.h b/arch/riscv/include/asm/bitops.h
>> new file mode 100644
>> index 000000000..e77ab8320
>> --- /dev/null
>> +++ b/arch/riscv/include/asm/bitops.h
>> @@ -0,0 +1,35 @@
>> +/*
>> + * This program is free software; you can redistribute it and/or
>> + * modify it under the terms of the GNU General Public License as
>> + * published by the Free Software Foundation; either version 2 of
>> + * the License, or (at your option) any later version.
>> + *
>> + * This program is distributed in the hope that it will be useful,
>> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
>> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
>> + * GNU General Public License for more details.
>> + *
>> + *
>> + */
>> +
>> +#ifndef _ASM_BITOPS_H_
>> +#define _ASM_BITOPS_H_
>> +
>> +#include <asm-generic/bitops/__ffs.h>
>> +#include <asm-generic/bitops/__fls.h>
>> +#include <asm-generic/bitops/ffs.h>
>> +#include <asm-generic/bitops/fls.h>
>> +#include <asm-generic/bitops/ffz.h>
>> +#include <asm-generic/bitops/hweight.h>
>> +#include <asm-generic/bitops/fls64.h>
>> +#include <asm-generic/bitops/find.h>
>> +#include <asm-generic/bitops/ops.h>
>> +
>> +#define set_bit(x, y)			__set_bit(x, y)
>> +#define clear_bit(x, y)			__clear_bit(x, y)
>> +#define change_bit(x, y)		__change_bit(x, y)
>> +#define test_and_set_bit(x, y)		__test_and_set_bit(x, y)
>> +#define test_and_clear_bit(x, y)	__test_and_clear_bit(x, y)
>> +#define test_and_change_bit(x, y)	__test_and_change_bit(x, y)
>> +
>> +#endif /* _ASM_BITOPS_H_ */
>> diff --git a/arch/riscv/include/asm/bitsperlong.h b/arch/riscv/include/asm/bitsperlong.h
>> new file mode 100644
>> index 000000000..4641e7e48
>> --- /dev/null
>> +++ b/arch/riscv/include/asm/bitsperlong.h
>> @@ -0,0 +1,10 @@
>> +#ifndef __ASM_BITSPERLONG_H
>> +#define __ASM_BITSPERLONG_H
>> +
>> +#ifdef __riscv64
>> +#define BITS_PER_LONG 64
>> +#else
>> +#define BITS_PER_LONG 32
>> +#endif
>> +
>> +#endif /* __ASM_BITSPERLONG_H */
>> diff --git a/arch/riscv/include/asm/byteorder.h b/arch/riscv/include/asm/byteorder.h
>> new file mode 100644
>> index 000000000..778bb7224
>> --- /dev/null
>> +++ b/arch/riscv/include/asm/byteorder.h
>> @@ -0,0 +1,10 @@
>> +#ifndef _ASM_RISCV_BYTEORDER_H
>> +#define _ASM_RISCV_BYTEORDER_H
>> +
>> +#if defined(__RISCVEB__)
>> +#include <linux/byteorder/big_endian.h>
>> +#else
>> +#include <linux/byteorder/little_endian.h>
>> +#endif
>> +
>> +#endif /* _ASM_RISCV_BYTEORDER_H */
>> diff --git a/arch/riscv/include/asm/common.h b/arch/riscv/include/asm/common.h
>> new file mode 100644
>> index 000000000..bc8a17e30
>> --- /dev/null
>> +++ b/arch/riscv/include/asm/common.h
>> @@ -0,0 +1,6 @@
>> +#ifndef ASM_RISCV_COMMON_H
>> +#define ASM_RISCV_COMMON_H
>> +
>> +/* nothing special yet */
>> +
>> +#endif /* ASM_RISCV_COMMON_H */
>> diff --git a/arch/riscv/include/asm/elf.h b/arch/riscv/include/asm/elf.h
>> new file mode 100644
>> index 000000000..7134fa058
>> --- /dev/null
>> +++ b/arch/riscv/include/asm/elf.h
>> @@ -0,0 +1,11 @@
>> +#ifndef __ASM_RISCV_ELF_H__
>> +#define __ASM_RISCV_ELF_H__
>> +
>> +#if __SIZEOF_POINTER__ == 8
>> +#define ELF_CLASS	ELFCLASS64
>> +#define CONFIG_PHYS_ADDR_T_64BIT
>> +#else
>> +#define ELF_CLASS	ELFCLASS32
>> +#endif
>> +
>> +#endif /* __ASM_RISCV_ELF_H__ */
>> diff --git a/arch/riscv/include/asm/io.h b/arch/riscv/include/asm/io.h
>> new file mode 100644
>> index 000000000..3cdea7fca
>> --- /dev/null
>> +++ b/arch/riscv/include/asm/io.h
>> @@ -0,0 +1,8 @@
>> +#ifndef __ASM_RISCV_IO_H
>> +#define __ASM_RISCV_IO_H
>> +
>> +#define IO_SPACE_LIMIT 0
>> +
>> +#include <asm-generic/io.h>
>> +
>> +#endif /* __ASM_RISCV_IO_H */
>> diff --git a/arch/riscv/include/asm/mmu.h b/arch/riscv/include/asm/mmu.h
>> new file mode 100644
>> index 000000000..95af87142
>> --- /dev/null
>> +++ b/arch/riscv/include/asm/mmu.h
>> @@ -0,0 +1,6 @@
>> +#ifndef __ASM_MMU_H
>> +#define __ASM_MMU_H
>> +
>> +#define MAP_ARCH_DEFAULT MAP_UNCACHED
>> +
>> +#endif /* __ASM_MMU_H */
>> diff --git a/arch/riscv/include/asm/posix_types.h b/arch/riscv/include/asm/posix_types.h
>> new file mode 100644
>> index 000000000..22cae6230
>> --- /dev/null
>> +++ b/arch/riscv/include/asm/posix_types.h
>> @@ -0,0 +1 @@
>> +#include <asm-generic/posix_types.h>
>> diff --git a/arch/riscv/include/asm/sections.h b/arch/riscv/include/asm/sections.h
>> new file mode 100644
>> index 000000000..2b8c51603
>> --- /dev/null
>> +++ b/arch/riscv/include/asm/sections.h
>> @@ -0,0 +1 @@
>> +#include <asm-generic/sections.h>
>> diff --git a/arch/riscv/include/asm/string.h b/arch/riscv/include/asm/string.h
>> new file mode 100644
>> index 000000000..2997587d8
>> --- /dev/null
>> +++ b/arch/riscv/include/asm/string.h
>> @@ -0,0 +1 @@
>> +/* dummy */
>> diff --git a/arch/riscv/include/asm/swab.h b/arch/riscv/include/asm/swab.h
>> new file mode 100644
>> index 000000000..60a90120b
>> --- /dev/null
>> +++ b/arch/riscv/include/asm/swab.h
>> @@ -0,0 +1,6 @@
>> +#ifndef _ASM_SWAB_H
>> +#define _ASM_SWAB_H
>> +
>> +/* nothing. use generic functions */
>> +
>> +#endif /* _ASM_SWAB_H */
>> diff --git a/arch/riscv/include/asm/types.h b/arch/riscv/include/asm/types.h
>> new file mode 100644
>> index 000000000..ba386ab4c
>> --- /dev/null
>> +++ b/arch/riscv/include/asm/types.h
>> @@ -0,0 +1,60 @@
>> +#ifndef __ASM_RISCV_TYPES_H
>> +#define __ASM_RISCV_TYPES_H
>> +
>> +#ifdef __riscv64
>> +/*
>> + * This is used in dlmalloc. On RISCV64 we need it to be 64 bit
>> + */
>> +#define INTERNAL_SIZE_T unsigned long
>> +
>> +/*
>> + * This is a Kconfig variable in the Kernel, but we want to detect
>> + * this during compile time, so we set it here.
>> + */
>> +#define CONFIG_PHYS_ADDR_T_64BIT
>> +
>> +#endif
>> +
>> +typedef unsigned short umode_t;
>> +
>> +/*
>> + * __xx is ok: it doesn't pollute the POSIX namespace. Use these in the
>> + * header files exported to user space
>> + */
>> +
>> +typedef __signed__ char __s8;
>> +typedef unsigned char __u8;
>> +
>> +typedef __signed__ short __s16;
>> +typedef unsigned short __u16;
>> +
>> +typedef __signed__ int __s32;
>> +typedef unsigned int __u32;
>> +
>> +#if defined(__GNUC__) && !defined(__STRICT_ANSI__)
>> +typedef __signed__ long long __s64;
>> +typedef unsigned long long __u64;
>> +#endif
>> +
>> +/*
>> + * These aren't exported outside the kernel to avoid name space clashes
>> + */
>> +#ifdef __KERNEL__
>> +
>> +typedef signed char s8;
>> +typedef unsigned char u8;
>> +
>> +typedef signed short s16;
>> +typedef unsigned short u16;
>> +
>> +typedef signed int s32;
>> +typedef unsigned int u32;
>> +
>> +typedef signed long long s64;
>> +typedef unsigned long long u64;
>> +
>> +#include <asm/bitsperlong.h>
>> +
>> +#endif /* __KERNEL__ */
>> +
>> +#endif /* __ASM_RISCV_TYPES_H */
>> diff --git a/arch/riscv/include/asm/unaligned.h b/arch/riscv/include/asm/unaligned.h
>> new file mode 100644
>> index 000000000..aaebc0641
>> --- /dev/null
>> +++ b/arch/riscv/include/asm/unaligned.h
>> @@ -0,0 +1,19 @@
>> +#ifndef _ASM_RISCV_UNALIGNED_H
>> +#define _ASM_RISCV_UNALIGNED_H
>> +
>> +/*
>> + * FIXME: this file is copy-n-pasted from sandbox's unaligned.h
>> + */
>> +
>> +#include <linux/unaligned/access_ok.h>
>> +#include <linux/unaligned/generic.h>
>> +
>> +#if __BYTE_ORDER == __LITTLE_ENDIAN
>> +#define get_unaligned __get_unaligned_le
>> +#define put_unaligned __put_unaligned_le
>> +#else
>> +#define get_unaligned __get_unaligned_be
>> +#define put_unaligned __put_unaligned_be
>> +#endif
>> +
>> +#endif /* _ASM_RISCV_UNALIGNED_H */
>> diff --git a/arch/riscv/lib/.gitignore b/arch/riscv/lib/.gitignore
>> new file mode 100644
>> index 000000000..d1165788c
>> --- /dev/null
>> +++ b/arch/riscv/lib/.gitignore
>> @@ -0,0 +1 @@
>> +barebox.lds
>> diff --git a/arch/riscv/lib/Makefile b/arch/riscv/lib/Makefile
>> new file mode 100644
>> index 000000000..313363c1a
>> --- /dev/null
>> +++ b/arch/riscv/lib/Makefile
>> @@ -0,0 +1,9 @@
>> +extra-$(CONFIG_GENERIC_LINKER_SCRIPT) += barebox.lds
>> +
>> +obj-y += riscv_timer.o
>> +
>> +obj-$(CONFIG_32BIT) += lshrdi3.o
>> +obj-$(CONFIG_32BIT) += ashldi3.o
>> +obj-$(CONFIG_32BIT) += ashrdi3.o
>> +
>> +obj-$(CONFIG_BUILTIN_DTB) += dtb.o
>> diff --git a/arch/riscv/lib/ashldi3.c b/arch/riscv/lib/ashldi3.c
>> new file mode 100644
>> index 000000000..cbdbcbb6a
>> --- /dev/null
>> +++ b/arch/riscv/lib/ashldi3.c
>> @@ -0,0 +1,28 @@
>> +#include <module.h>
>> +
>> +#include "libgcc.h"
>> +
>> +long long __ashldi3(long long u, word_type b)
>> +{
>> +	DWunion uu, w;
>> +	word_type bm;
>> +
>> +	if (b == 0)
>> +		return u;
>> +
>> +	uu.ll = u;
>> +	bm = 32 - b;
>> +
>> +	if (bm <= 0) {
>> +		w.s.low = 0;
>> +		w.s.high = (unsigned int) uu.s.low << -bm;
>> +	} else {
>> +		const unsigned int carries = (unsigned int) uu.s.low >> bm;
>> +
>> +		w.s.low = (unsigned int) uu.s.low << b;
>> +		w.s.high = ((unsigned int) uu.s.high << b) | carries;
>> +	}
>> +
>> +	return w.ll;
>> +}
>> +EXPORT_SYMBOL(__ashldi3);
>> diff --git a/arch/riscv/lib/ashrdi3.c b/arch/riscv/lib/ashrdi3.c
>> new file mode 100644
>> index 000000000..928d6d97c
>> --- /dev/null
>> +++ b/arch/riscv/lib/ashrdi3.c
>> @@ -0,0 +1,30 @@
>> +#include <module.h>
>> +
>> +#include "libgcc.h"
>> +
>> +long long __ashrdi3(long long u, word_type b)
>> +{
>> +	DWunion uu, w> +	word_type bm;
>> +
>> +	if (b == 0)
>> +		return u;
>> +
>> +	uu.ll = u;
>> +	bm = 32 - b;
>> +
>> +	if (bm <= 0) {
>> +		/* w.s.high = 1..1 or 0..0 */
>> +		w.s.high =
>> +		    uu.s.high >> 31;
>> +		w.s.low = uu.s.high >> -bm;
>> +	} else {
>> +		const unsigned int carries = (unsigned int) uu.s.high << bm;
>> +
>> +		w.s.high = uu.s.high >> b;
>> +		w.s.low = ((unsigned int) uu.s.low >> b) | carries;
>> +	}
>> +
>> +	return w.ll;
>> +}
>> +EXPORT_SYMBOL(__ashrdi3);
>> diff --git a/arch/riscv/lib/asm-offsets.c b/arch/riscv/lib/asm-offsets.c
>> new file mode 100644
>> index 000000000..22f382b71
>> --- /dev/null
>> +++ b/arch/riscv/lib/asm-offsets.c
>> @@ -0,0 +1,12 @@
>> +/*
>> + * Generate definitions needed by assembly language modules.
>> + * This code generates raw asm output which is post-processed to extract
>> + * and format the required data.
>> + */
>> +
>> +#include <linux/kbuild.h>
>> +
>> +int main(void)
>> +{
>> +	return 0;
>> +}
>> diff --git a/arch/riscv/lib/barebox.lds.S b/arch/riscv/lib/barebox.lds.S
>> new file mode 100644
>> index 000000000..9468fb8b5
>> --- /dev/null
>> +++ b/arch/riscv/lib/barebox.lds.S
>> @@ -0,0 +1,89 @@
>> +/*
>> + * Copyright (C) 2016 Antony Pavlov <antonynpavlov@gmail.com>
>> + *
>> + * This file is part of barebox.
>> + * See file CREDITS for list of people who contributed to this project.
>> + *
>> + * This program is free software; you can redistribute it and/or modify
>> + * it under the terms of the GNU General Public License version 2
>> + * as published by the Free Software Foundation.
>> + *
>> + * This program is distributed in the hope that it will be useful,
>> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
>> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
>> + * GNU General Public License for more details.
>> + *
>> + */
>> +
>> +#include <asm-generic/barebox.lds.h>
>> +
>> +OUTPUT_ARCH(riscv)
>> +ENTRY(_start)
>> +SECTIONS
>> +{
>> +	. = TEXT_BASE;
>> +
>> +	. = ALIGN(8);
>> +	.text      :
>> +	{
>> +		_stext = .;
>> +		_start = .;
>> +		KEEP(*(.text_entry*))
>> +		_text = .;
>> +		__bare_init_start = .;
>> +		*(.text_bare_init*)
>> +		__bare_init_end = .;
>> +		*(.text*)
>> +	}
>> +	BAREBOX_BARE_INIT_SIZE
>> +
>> +	PRE_IMAGE
>> +
>> +	. = ALIGN(8);
>> +	.rodata : { *(.rodata*) }
>> +
>> +	_etext = .;			/* End of text and rodata section */
>> +	_sdata = .;
>> +
>> +	. = ALIGN(8);
>> +	.data : { *(.data*) }
>> +
>> +	.barebox_imd : { BAREBOX_IMD }
>> +
>> +	. = ALIGN(8);
>> +	.got : { *(.got*) }
>> +
>> +	. = .;
>> +	__barebox_cmd_start = .;
>> +	.barebox_cmd : { BAREBOX_CMDS }
>> +	__barebox_cmd_end = .;
>> +
>> +	__barebox_magicvar_start = .;
>> +	.barebox_magicvar : { BAREBOX_MAGICVARS }
>> +	__barebox_magicvar_end = .;
>> +
>> +	__barebox_initcalls_start = .;
>> +	.barebox_initcalls : { INITCALLS }
>> +	__barebox_initcalls_end = .;
>> +
>> +	__barebox_exitcalls_start = .;
>> +	.barebox_exitcalls : { EXITCALLS }
>> +	__barebox_exitcalls_end = .;
>> +
>> +	__usymtab_start = .;
>> +	__usymtab : { BAREBOX_SYMS }
>> +	__usymtab_end = .;
>> +
>> +	.rela.dyn : { *(.rela*) }
>> +
>> +	.oftables : { BAREBOX_CLK_TABLE() }
>> +
>> +	.dtb : { BAREBOX_DTB() }
>> +
>> +	_edata = .;
>> +	. = ALIGN(8);
>> +	__bss_start = .;
>> +	.bss : { *(.bss*) *(.sbss*) }
>> +	__bss_stop = .;
>> +	_end = .;
>> +}
>> diff --git a/arch/riscv/lib/dtb.c b/arch/riscv/lib/dtb.c
>> new file mode 100644
>> index 000000000..09f519dcc
>> --- /dev/null
>> +++ b/arch/riscv/lib/dtb.c
>> @@ -0,0 +1,41 @@
>> +/*
>> + * Copyright (C) 2016 Antony Pavlov <antonynpavlov@gmail.com>
>> + *
>> + * See file CREDITS for list of people who contributed to this
>> + * project.
>> + *
>> + * This program is free software; you can redistribute it and/or modify
>> + * it under the terms of the GNU General Public License version 2
>> + * as published by the Free Software Foundation.
>> + *
>> + * This program is distributed in the hope that it will be useful,
>> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
>> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
>> + * GNU General Public License for more details.
>> + *
>> + */
>> +#include <common.h>
>> +#include <init.h>
>> +#include <of.h>
>> +
>> +extern char __dtb_start[];
>> +
>> +static int of_riscv_init(void)
>> +{
>> +	struct device_node *root;
>> +
>> +	root = of_get_root_node();
>> +	if (root)
>> +		return 0;
>> +
>> +	root = of_unflatten_dtb(__dtb_start);
>> +	if (!IS_ERR(root)) {
>> +		pr_debug("using internal DTB\n");
>> +		of_set_root_node(root);
>> +		if (IS_ENABLED(CONFIG_OFDEVICE))
>> +			of_probe();
>> +	}
>> +
>> +	return 0;
>> +}
>> +core_initcall(of_riscv_init);
>> diff --git a/arch/riscv/lib/libgcc.h b/arch/riscv/lib/libgcc.h
>> new file mode 100644
>> index 000000000..593e59802
>> --- /dev/null
>> +++ b/arch/riscv/lib/libgcc.h
>> @@ -0,0 +1,29 @@
>> +#ifndef __ASM_LIBGCC_H
>> +#define __ASM_LIBGCC_H
>> +
>> +#include <asm/byteorder.h>
>> +
>> +typedef int word_type __attribute__ ((mode (__word__)));
>> +#ifdef __BIG_ENDIAN
>> +struct DWstruct {
>> +	int high, low;
>> +};
>> +#elif defined(__LITTLE_ENDIAN)
>> +struct DWstruct {
>> +	int low, high;
>> +};
>> +#else
>> +#error I feel sick.
>> +#endif
>> +
>> +typedef union {
>> +	struct DWstruct s;
>> +	long long ll;
>> +} DWunion;
>> +
>> +long long __lshrdi3(long long u, word_type b);
>> +long long __ashldi3(long long u, word_type b);
>> +long long __ashrdi3(long long u, word_type b);
>> +
>> +#endif /* __ASM_LIBGCC_H */
>> diff --git a/arch/riscv/lib/lshrdi3.c b/arch/riscv/lib/lshrdi3.c
>> new file mode 100644
>> index 000000000..74a4846e9
>> --- /dev/null
>> +++ b/arch/riscv/lib/lshrdi3.c
>> @@ -0,0 +1,28 @@
>> +#include <module.h>
>> +
>> +#include "libgcc.h"
>> +
>> +long long __lshrdi3(long long u, word_type b)
>> +{
>> +	DWunion uu, w;
>> +	word_type bm;
>> +
>> +	if (b == 0)
>> +		return u;
>> +
>> +	uu.ll = u;
>> +	bm = 32 - b;
>> +
>> +	if (bm <= 0) {
>> +		w.s.high = 0;
>> +		w.s.low = (unsigned int) uu.s.high >> -bm;
>> +	} else {
>> +		const unsigned int carries = (unsigned int) uu.s.high << bm;
>> +
>> +		w.s.high = (unsigned int) uu.s.high >> b;
>> +		w.s.low = ((unsigned int) uu.s.low >> b) | carries;
>> +	}
>> +
>> +	return w.ll;
>> +}
>> +EXPORT_SYMBOL(__lshrdi3);
>> diff --git a/arch/riscv/lib/riscv_timer.c b/arch/riscv/lib/riscv_timer.c
>> new file mode 100644
>> index 000000000..46181f877
>> --- /dev/null
>> +++ b/arch/riscv/lib/riscv_timer.c
>> @@ -0,0 +1,68 @@
>> +/*
>> + * Copyright (C) 2017 Antony Pavlov <antonynpavlov@gmail.com>
>> + *
>> + * This file is part of barebox.
>> + * See file CREDITS for list of people who contributed to this project.
>> + *
>> + * This program is free software; you can redistribute it and/or modify
>> + * it under the terms of the GNU General Public License version 2
>> + * as published by the Free Software Foundation.
>> + *
>> + * This program is distributed in the hope that it will be useful,
>> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
>> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
>> + * GNU General Public License for more details.
>> + *
>> + */
>> +
>> +/**
>> + * @file
>> + * @brief Clocksource based on RISCV cycle CSR timer
>> + */
>> +
>> +#include <init.h>
>> +#include <of.h>
>> +#include <linux/clk.h>
>> +#include <clock.h>
>> +#include <io.h>
>> +
>> +static uint64_t rdcycle_read(void)
>> +{
>> +	register unsigned long __v;
>> +
>> +	__asm__ __volatile__ ("rdcycle %0" : "=r" (__v));
>> +
Maybe you should also add support for 32-bit cores.
>> +	return __v;
>> +}
>> +
>> +static struct clocksource rdcycle_cs = {
>> +	.read	= rdcycle_read,
>> +	.mask	= CLOCKSOURCE_MASK(32),
>> +};
>> +

-- 
Mit freundlichen Grüßen,
With best regards,
   Daniel Schultz


_______________________________________________
barebox mailing list
barebox@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/barebox

Re: [RFC v4 01/10] Add initial RISC-V architecture support

[Antony Pavlov]

On Mon, 2 Oct 2017 12:08:58 +0200
Daniel Schultz <d.schultz@phytec.de> wrote:

> Hi,
> 
> 
> On 09/29/2017 02:07 PM, Oleksij Rempel wrote:
> > Hi,
> >
> > hm... mostly looks identical with existing arch
> >
> > Am 29.09.2017 um 01:12 schrieb Antony Pavlov:
> >> Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
> >> --
> >> TODOs:
> >>
> >>    * split patch;
> >> ---
> >>   arch/riscv/Kconfig                   | 73 +++++++++++++++++++++++++++++
> >>   arch/riscv/Makefile                  | 68 +++++++++++++++++++++++++++
> >>   arch/riscv/boot/Makefile             |  2 +
> >>   arch/riscv/boot/main_entry.c         | 40 ++++++++++++++++
> >>   arch/riscv/boot/start.S              | 74 ++++++++++++++++++++++++++++++
> >>   arch/riscv/dts/.gitignore            |  >  arch/riscv/dts/Makefile              |  9 ++++
> >>   arch/riscv/dts/skeleton.dtsi         | 13 ++++++
> >>   arch/riscv/include/asm/barebox.h     |  1 +
> >>   arch/riscv/include/asm/bitops.h      | 35 ++++++++++++++
> >>   arch/riscv/include/asm/bitsperlong.h | 10 ++++
> >>   arch/riscv/include/asm/byteorder.h   | 10 ++++
> >>   arch/riscv/include/asm/common.h      |  6 +++
> >>   arch/riscv/include/asm/elf.h         | 11 +++++
> >>   arch/riscv/include/asm/io.h          |  8 ++++
> >>   arch/riscv/include/asm/mmu.h         |  6 +++
> >>   arch/riscv/include/asm/posix_types.h |  1 +
> >>   arch/riscv/include/asm/sections.h    |  1 +
> >>   arch/riscv/include/asm/string.h      |  1 +
> >>   arch/riscv/include/asm/swab.h        |  6 +++
> >>   arch/riscv/include/asm/types.h       | 60 ++++++++++++++++++++++++
> >>   arch/riscv/include/asm/unaligned.h   | 19 ++++++++
> >>   arch/riscv/lib/.gitignore            |  1 +
> >>   arch/riscv/lib/Makefile              |  9 ++++
> >>   arch/riscv/lib/ashldi3.c             | 28 ++++++++++++
> >>   arch/riscv/lib/ashrdi3.c             | 30 ++++++++++++
> >>   arch/riscv/lib/asm-offsets.c         | 12 +++++
> >>   arch/riscv/lib/barebox.lds.S         | 89 ++++++++++++++++++++++++++++++++++++
> >>   arch/riscv/lib/dtb.c                 | 41 +++++++++++++++++
> >>   arch/riscv/lib/libgcc.h              | 29 ++++++++++++
> >>   arch/riscv/lib/lshrdi3.c             | 28 ++++++++++++
> >>   arch/riscv/lib/riscv_timer.c         | 68 +++++++++++++++++++++++++++
> >>   drivers/of/Kconfig                   |  2 +-
> >>   33 files changed, 791 insertions(+), 1 deletion(-)
> >>
> >> diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
> >> new file mode 100644
> >> index 000000000..b2f0817ef
> >> --- /dev/null
> >> +++ b/arch/riscv/Kconfig
> >> @@ -0,0 +1,73 @@
> >> +config RISCV
> >> +	bool
> >> +	select GENERIC_FIND_NEXT_BIT
> >> +	select HAVE_CONFIGURABLE_MEMORY_LAYOUT
> >> +	select HAVE_CONFIGURABLE_TEXT_BASE
> >> +	select GPIOLIB
> >> +	select OFTREE
> >> +	select COMMON_CLK
> >> +	select COMMON_CLK_OF_PROVIDER
> >> +	select CLKDEV_LOOKUP
> >> +	default y
> >> +
> >> +config ARCH_TEXT_BASE
> >> +	hex
> >> +	default 0x0
> >> +
> >> +config GENERIC_LINKER_SCRIPT
> >> +	bool
> >> +	default y
> >> +
> >> +menu "Machine selection"
> >> +
> >> +choice
> >> +	prompt "CPU selection"
> >> +	default CPU_RV_GENERIC
> >> +
> >> +config CPU_RV_GENERIC
> >> +	bool "Generic RISC-V"
> >> +	select CPU_SUPPORTS_32BIT_KERNEL
> >> +	select CPU_SUPPORTS_64BIT_KERNEL
> >> +
> >> +endchoice
> >> +
> >> +config CPU_SUPPORTS_32BIT_KERNEL
> >> +	bool
> >> +config CPU_SUPPORTS_64BIT_KERNEL
> >> +	bool
> >> +
> >> +choice
> >> +	prompt "barebox code model"
> >> +	default 64BIT
> >> +
> >> +config 32BIT
> >> +	bool "32-bit barebox"
> >> +	depends on CPU_SUPPORTS_32BIT_KERNEL
> >> +	help
> >> +	  Select this option to build a 32-bit barebox.
> >> +
> >> +config 64BIT
> >> +	bool "64-bit barebox"
> >> +	depends on CPU_SUPPORTS_64BIT_KERNEL
> >> +	help
> >> +	  Select this option to build a 64-bit barebox.
> >> +
> >> +endchoice
> >> +
> >> +config BUILTIN_DTB
> >> +	bool "link a DTB into the barebox image"
> >> +	depends on OFTREE
> >> +
> >> +config BUILTIN_DTB_NAME
> >> +	string "DTB to build into the barebox image"
> >> +	depends on BUILTIN_DTB
> >> +
> >> +endmenu
> >> +
> >> +source common/Kconfig
> >> +source commands/Kconfig
> >> +source net/Kconfig
> >> +source drivers/Kconfig
> >> +source fs/Kconfig
> >> +source lib/Kconfig
> >> +source crypto/Kconfig
> >> diff --git a/arch/riscv/Makefile b/arch/riscv/Makefile
> >> new file mode 100644
> >> index 000000000..4e3318cf1
> >> --- /dev/null
> >> +++ b/arch/riscv/Makefile
> >> @@ -0,0 +1,68 @@
> >> +CPPFLAGS += -fno-strict-aliasing
> >> +
> >> +cflags-y += -fno-pic -pipe
> >> +cflags-y += -Wall -Wmissing-prototypes -Wstrict-prototypes \
> >> +	-Wno-uninitialized -Wno-format -Wno-main -mcmodel=medany
> >> +
> >> +LDFLAGS += $(ldflags-y)
> >> +LDFLAGS_barebox += -nostdlib
> >> +
> >> +TEXT_BASE = $(CONFIG_TEXT_BASE)
> >> +CPPFLAGS += -DTEXT_BASE=$(CONFIG_TEXT_BASE)
> >> +
> >> +ifndef CONFIG_MODULES
> >> +# Add cleanup flags
> >> +CPPFLAGS += -fdata-sections -ffunction-sections
> >> +LDFLAGS_barebox += -static --gc-sections
> >> +endif
> >> +
> >> +KBUILD_BINARY := barebox.bin
> >> +
> >> +machdirs := $(patsubst %,arch/riscv/mach-%/,$(machine-y))
> >> +
> >> +ifneq ($(board-y),)
> >> +BOARD := arch/riscv/boards/$(board-y)/
> >> +else
> >> +BOARD :=
> >> +endif
> >> +
> >> +ifeq ($(KBUILD_SRC),)
> >> +CPPFLAGS += -I$(BOARD)/include
> >> +else
> >> +CPPFLAGS += -I$(srctree)/$(BOARD)/include
> >> +endif
> >> +
> >> +ifeq ($(KBUILD_SRC),)
> >> +CPPFLAGS += $(patsubst %,-I%include,$(machdirs))
> >> +else
> >> +CPPFLAGS += $(patsubst %,-I$(srctree)/%include,$(machdirs))
> >> +endif
> >> +
> >> +archprepare: maketools
> >> +
> >> +PHONY += maketools
> >> +
> >> +ifneq ($(machine-y),)
> >> +MACH  := arch/riscv/mach-$(machine-y)/
> >> +else
> >> +MACH  :=
> >> +endif
> >> +
> >> +ifneq ($(board-y),)
> >> +BOARD := arch/riscv/boards/$(board-y)/
> >> +else
> >> +BOARD :=
> >> +endif
> >> +
> >> +common-y += $(BOARD) $(MACH)
> >> +common-y += arch/riscv/lib/
> >> +common-y += arch/riscv/boot/
> >> +
> >> +common-$(CONFIG_OFTREE) += arch/riscv/dts/
> >> +
> >> +CPPFLAGS += $(cflags-y)
> >> +CFLAGS += $(cflags-y)
> >> +
> >> +lds-y	:= arch/riscv/lib/barebox.lds
> >> +
> >> +CLEAN_FILES += arch/riscv/lib/barebox.lds
> >> diff --git a/arch/riscv/boot/Makefile b/arch/riscv/boot/Makefile
> >> new file mode 100644
> >> index 000000000..d6d28ce65
> >> --- /dev/null
> >> +++ b/arch/riscv/boot/Makefile
> >> @@ -0,0 +1,2 @@
> >> +obj-y += start.o
> >> +obj-y += main_entry.o
> >> diff --git a/arch/riscv/boot/main_entry.c b/arch/riscv/boot/main_entry.c
> >> new file mode 100644
> >> index 000000000..18db86da5
> >> --- /dev/null
> >> +++ b/arch/riscv/boot/main_entry.c
> >> @@ -0,0 +1,40 @@
> >> +/*
> >> + * Copyright (C) 2016 Antony Pavlov <antonynpavlov@gmail.com>
> >> + *
> >> + * This file is part of barebox.
> >> + * See file CREDITS for list of people who contributed to this project.
> >> + *
> >> + * This program is free software; you can redistribute it and/or
> >> + * modify it under the terms of the GNU General Public License as
> >> + * published by the Free Software Foundation; either version 2 of
> >> + * the License, or (at your option) any later version.
> >> + *
> >> + * This program is distributed in the hope that it will be useful,
> >> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> >> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> >> + * GNU General Public License for more details.
> >> + *
> >> + */
> >> +
> >> +#include <common.h>
> >> +#include <memory.h>
> >> +#include <asm-generic/memory_layout.h>
> >> +#include <asm/sections.h>
> >> +
> >> +void main_entry(void);
> >> +
> >> +/**
> >> + * Called plainly from assembler code
> >> + *
> >> + * @note The C environment isn't initialized yet
> >> + */
> >> +void main_entry(void)
> >> +{
> >> +	/* clear the BSS first */
> >> +	memset(__bss_start, 0x00, __bss_stop - __bss_start);
> >> +
> >> +	mem_malloc_init((void *)MALLOC_BASE,
> >> +			(void *)(MALLOC_BASE + MALLOC_SIZE - 1));
> >> +
> >> +	start_barebox();
> >> +}
> >> diff --git a/arch/riscv/boot/start.S b/arch/riscv/boot/start.S
> >> new file mode 100644
> >> index 000000000..2fd00f63d
> >> --- /dev/null
> >> +++ b/arch/riscv/boot/start.S
> >> @@ -0,0 +1,74 @@
> >> +/*
> >> + * Startup Code for MIPS CPU
> >> + *
> >> + * based on coreboot/src/arch/riscv/bootblock.S
> >> + *
> >> + * Copyright (C) 2016 Antony Pavlov <antonynpavlov@gmail.com>
> >> + *
> >> + * This file is part of barebox.
> >> + * See file CREDITS for list of people who contributed to this project.
> >> + *
> >> + * This program is free software; you can redistribute it and/or modify
> >> + * it under the terms of the GNU General Public License version 2
> >> + * as published by the Free Software Foundation.
> >> + *
> >> + * This program is distributed in the hope that it will be useful,
> >> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> >> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> >> + * GNU General Public License for more details.
> >> + *
> >> + */
> >> +
> >> +#include <asm-generic/memory_layout.h>
> >> +
> >> +	.text
> >> +	.section ".text_entry"
> >> +	.align 2
> >> +
> >> +.globl _start
> >> +_start:
> >> +	li sp, STACK_BASE + STACK_SIZE
> >> +
> >> +	# make room for HLS and initialize it
> >> +	addi sp, sp, -64 /* MENTRY_FRAME_SIZE */
> >> +
> >> +	# poison the stack
> >> +	li t1, STACK_BASE
> >> +	li t0, 0xdeadbeef
> >> +	sw t0, 0(t1)
> >> +
> >> +	# clear any pending interrupts
> >> +	//csrwi mip, 0
> > should be removed.
> >
> >> +	/* copy barebox to link location */
> >> +
> >> +	la	a0, _start	/* a0 <- _start actual address */
> >> +	li	a1, CONFIG_TEXT_BASE	/* a1 <- _start link address */
> >> +
> >> +	beq	a0, a1, main_entry
> >> +
> >> +	la	a2, __bss_start
> >> +
> >> +#define LONGSIZE 4
> >> +
> >> +copy_loop:
> >> +	/* copy from source address [a0] */
> >> +	lw	t0, LONGSIZE * 0(a0)
> >> +	lw	t1, LONGSIZE * 1(a0)
> >> +	lw	t2, LONGSIZE * 2(a0)
> >> +	lw	t3, LONGSIZE * 3(a0)
> >> +	/* copy to target address [a1] */
> >> +	sw	t0, LONGSIZE * 0(a1)
> >> +	sw	t1, LONGSIZE * 1(a1)
> >> +	sw	t2, LONGSIZE * 2(a1)
> >> +	sw	t3, LONGSIZE * 3(a1)
> >> +	addi	a0, a0, LONGSIZE * 2
> >> +	addi	a1, a1, LONGSIZE * 2
> >> +	bgeu	a2, a0, copy_loop
> >> +
> >> +	/* Alas! At the moment I can't load main_entry __link__ address
> >> +	   into a0 with la. Use CONFIG_TEXT_BASE instead. This solution
> >> +	   leads to extra cycles for repeat sp initialization. */
> >> +
> >> +	li	a0, CONFIG_TEXT_BASE
> >> +	jalr	a0
> >> diff --git a/arch/riscv/dts/.gitignore b/arch/riscv/dts/.gitignore
> >> new file mode 100644
> >> index 000000000..077903c50
> >> --- /dev/null
> >> +++ b/arch/riscv/dts/.gitignore
> >> @@ -0,0 +1 @@
> >> +*dtb*
> >> diff --git a/arch/riscv/dts/Makefile b/arch/riscv/dts/Makefile
> >> new file mode 100644
> >> index 000000000..f8380b11c
> >> --- /dev/null
> >> +++ b/arch/riscv/dts/Makefile
> >> @@ -0,0 +1,9 @@
> >> +BUILTIN_DTB := $(patsubst "%",%,$(CONFIG_BUILTIN_DTB_NAME))
> >> +obj-$(CONFIG_BUILTIN_DTB) += $(BUILTIN_DTB).dtb.o
> >> +
> >> +# just to build a built-in.o. Otherwise compilation fails when no devicetree is
> >> +# created.
> >> +obj- += dummy.o
> >> +
> >> +always := $(dtb-y)
> >> +clean-files := *.dtb *.dtb.S .*.dtc .*.pre .*.dts
> >> diff --git a/arch/riscv/dts/skeleton.dtsi b/arch/riscv/dts/skeleton.dtsi
> >> new file mode 100644
> >> index 000000000..38ead821b
> >> --- /dev/null
> >> +++ b/arch/riscv/dts/skeleton.dtsi
> >> @@ -0,0 +1,13 @@
> >> +/*
> >> + * Skeleton device tree; the bare minimum needed to boot; just include and
> >> + * add a compatible value.  The bootloader will typically populate the memory
> >> + * node.
> >> + */
> >> +
> >> +/ {
> >> +	#address-cells = <2>;
> >> +	#size-cells = <1>;
> >> +	chosen { };
> >> +	aliases { };
> >> +	memory { device_type = "memory"; reg = <0 0 0>; };
> > "reg = <0 0>" instead?
> >
> >> +};
> >> diff --git a/arch/riscv/include/asm/barebox.h b/arch/riscv/include/asm/barebox.h
> >> new file mode 100644
> >> index 000000000..2997587d8
> >> --- /dev/null
> >> +++ b/arch/riscv/include/asm/barebox.h
> >> @@ -0,0 +1 @@
> >> +/* dummy */
> >> diff --git a/arch/riscv/include/asm/bitops.h b/arch/riscv/include/asm/bitops.h
> >> new file mode 100644
> >> index 000000000..e77ab8320
> >> --- /dev/null
> >> +++ b/arch/riscv/include/asm/bitops.h
> >> @@ -0,0 +1,35 @@
> >> +/*
> >> + * This program is free software; you can redistribute it and/or
> >> + * modify it under the terms of the GNU General Public License as
> >> + * published by the Free Software Foundation; either version 2 of
> >> + * the License, or (at your option) any later version.
> >> + *
> >> + * This program is distributed in the hope that it will be useful,
> >> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> >> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> >> + * GNU General Public License for more details.
> >> + *
> >> + *
> >> + */
> >> +
> >> +#ifndef _ASM_BITOPS_H_
> >> +#define _ASM_BITOPS_H_
> >> +
> >> +#include <asm-generic/bitops/__ffs.h>
> >> +#include <asm-generic/bitops/__fls.h>
> >> +#include <asm-generic/bitops/ffs.h>
> >> +#include <asm-generic/bitops/fls.h>
> >> +#include <asm-generic/bitops/ffz.h>
> >> +#include <asm-generic/bitops/hweight.h>
> >> +#include <asm-generic/bitops/fls64.h>
> >> +#include <asm-generic/bitops/find.h>
> >> +#include <asm-generic/bitops/ops.h>
> >> +
> >> +#define set_bit(x, y)			__set_bit(x, y)
> >> +#define clear_bit(x, y)			__clear_bit(x, y)
> >> +#define change_bit(x, y)		__change_bit(x, y)
> >> +#define test_and_set_bit(x, y)		__test_and_set_bit(x, y)
> >> +#define test_and_clear_bit(x, y)	__test_and_clear_bit(x, y)
> >> +#define test_and_change_bit(x, y)	__test_and_change_bit(x, y)
> >> +
> >> +#endif /* _ASM_BITOPS_H_ */
> >> diff --git a/arch/riscv/include/asm/bitsperlong.h b/arch/riscv/include/asm/bitsperlong.h
> >> new file mode 100644
> >> index 000000000..4641e7e48
> >> --- /dev/null
> >> +++ b/arch/riscv/include/asm/bitsperlong.h
> >> @@ -0,0 +1,10 @@
> >> +#ifndef __ASM_BITSPERLONG_H
> >> +#define __ASM_BITSPERLONG_H
> >> +
> >> +#ifdef __riscv64
> >> +#define BITS_PER_LONG 64
> >> +#else
> >> +#define BITS_PER_LONG 32
> >> +#endif
> >> +
> >> +#endif /* __ASM_BITSPERLONG_H */
> >> diff --git a/arch/riscv/include/asm/byteorder.h b/arch/riscv/include/asm/byteorder.h
> >> new file mode 100644
> >> index 000000000..778bb7224
> >> --- /dev/null
> >> +++ b/arch/riscv/include/asm/byteorder.h
> >> @@ -0,0 +1,10 @@
> >> +#ifndef _ASM_RISCV_BYTEORDER_H
> >> +#define _ASM_RISCV_BYTEORDER_H
> >> +
> >> +#if defined(__RISCVEB__)
> >> +#include <linux/byteorder/big_endian.h>
> >> +#else
> >> +#include <linux/byteorder/little_endian.h>
> >> +#endif
> >> +
> >> +#endif /* _ASM_RISCV_BYTEORDER_H */
> >> diff --git a/arch/riscv/include/asm/common.h b/arch/riscv/include/asm/common.h
> >> new file mode 100644
> >> index 000000000..bc8a17e30
> >> --- /dev/null
> >> +++ b/arch/riscv/include/asm/common.h
> >> @@ -0,0 +1,6 @@
> >> +#ifndef ASM_RISCV_COMMON_H
> >> +#define ASM_RISCV_COMMON_H
> >> +
> >> +/* nothing special yet */
> >> +
> >> +#endif /* ASM_RISCV_COMMON_H */
> >> diff --git a/arch/riscv/include/asm/elf.h b/arch/riscv/include/asm/elf.h
> >> new file mode 100644
> >> index 000000000..7134fa058
> >> --- /dev/null
> >> +++ b/arch/riscv/include/asm/elf.h
> >> @@ -0,0 +1,11 @@
> >> +#ifndef __ASM_RISCV_ELF_H__
> >> +#define __ASM_RISCV_ELF_H__
> >> +
> >> +#if __SIZEOF_POINTER__ == 8
> >> +#define ELF_CLASS	ELFCLASS64
> >> +#define CONFIG_PHYS_ADDR_T_64BIT
> >> +#else
> >> +#define ELF_CLASS	ELFCLASS32
> >> +#endif
> >> +
> >> +#endif /* __ASM_RISCV_ELF_H__ */
> >> diff --git a/arch/riscv/include/asm/io.h b/arch/riscv/include/asm/io.h
> >> new file mode 100644
> >> index 000000000..3cdea7fca
> >> --- /dev/null
> >> +++ b/arch/riscv/include/asm/io.h
> >> @@ -0,0 +1,8 @@
> >> +#ifndef __ASM_RISCV_IO_H
> >> +#define __ASM_RISCV_IO_H
> >> +
> >> +#define IO_SPACE_LIMIT 0
> >> +
> >> +#include <asm-generic/io.h>
> >> +
> >> +#endif /* __ASM_RISCV_IO_H */
> >> diff --git a/arch/riscv/include/asm/mmu.h b/arch/riscv/include/asm/mmu.h
> >> new file mode 100644
> >> index 000000000..95af87142
> >> --- /dev/null
> >> +++ b/arch/riscv/include/asm/mmu.h
> >> @@ -0,0 +1,6 @@
> >> +#ifndef __ASM_MMU_H
> >> +#define __ASM_MMU_H
> >> +
> >> +#define MAP_ARCH_DEFAULT MAP_UNCACHED
> >> +
> >> +#endif /* __ASM_MMU_H */
> >> diff --git a/arch/riscv/include/asm/posix_types.h b/arch/riscv/include/asm/posix_types.h
> >> new file mode 100644
> >> index 000000000..22cae6230
> >> --- /dev/null
> >> +++ b/arch/riscv/include/asm/posix_types.h
> >> @@ -0,0 +1 @@
> >> +#include <asm-generic/posix_types.h>
> >> diff --git a/arch/riscv/include/asm/sections.h b/arch/riscv/include/asm/sections.h
> >> new file mode 100644
> >> index 000000000..2b8c51603
> >> --- /dev/null
> >> +++ b/arch/riscv/include/asm/sections.h
> >> @@ -0,0 +1 @@
> >> +#include <asm-generic/sections.h>
> >> diff --git a/arch/riscv/include/asm/string.h b/arch/riscv/include/asm/string.h
> >> new file mode 100644
> >> index 000000000..2997587d8
> >> --- /dev/null
> >> +++ b/arch/riscv/include/asm/string.h
> >> @@ -0,0 +1 @@
> >> +/* dummy */
> >> diff --git a/arch/riscv/include/asm/swab.h b/arch/riscv/include/asm/swab.h
> >> new file mode 100644
> >> index 000000000..60a90120b
> >> --- /dev/null
> >> +++ b/arch/riscv/include/asm/swab.h
> >> @@ -0,0 +1,6 @@
> >> +#ifndef _ASM_SWAB_H
> >> +#define _ASM_SWAB_H
> >> +
> >> +/* nothing. use generic functions */
> >> +
> >> +#endif /* _ASM_SWAB_H */
> >> diff --git a/arch/riscv/include/asm/types.h b/arch/riscv/include/asm/types.h
> >> new file mode 100644
> >> index 000000000..ba386ab4c
> >> --- /dev/null
> >> +++ b/arch/riscv/include/asm/types.h
> >> @@ -0,0 +1,60 @@
> >> +#ifndef __ASM_RISCV_TYPES_H
> >> +#define __ASM_RISCV_TYPES_H
> >> +
> >> +#ifdef __riscv64
> >> +/*
> >> + * This is used in dlmalloc. On RISCV64 we need it to be 64 bit
> >> + */
> >> +#define INTERNAL_SIZE_T unsigned long
> >> +
> >> +/*
> >> + * This is a Kconfig variable in the Kernel, but we want to detect
> >> + * this during compile time, so we set it here.
> >> + */
> >> +#define CONFIG_PHYS_ADDR_T_64BIT
> >> +
> >> +#endif
> >> +
> >> +typedef unsigned short umode_t;
> >> +
> >> +/*
> >> + * __xx is ok: it doesn't pollute the POSIX namespace. Use these in the
> >> + * header files exported to user space
> >> + */
> >> +
> >> +typedef __signed__ char __s8;
> >> +typedef unsigned char __u8;
> >> +
> >> +typedef __signed__ short __s16;
> >> +typedef unsigned short __u16;
> >> +
> >> +typedef __signed__ int __s32;
> >> +typedef unsigned int __u32;
> >> +
> >> +#if defined(__GNUC__) && !defined(__STRICT_ANSI__)
> >> +typedef __signed__ long long __s64;
> >> +typedef unsigned long long __u64;
> >> +#endif
> >> +
> >> +/*
> >> + * These aren't exported outside the kernel to avoid name space clashes
> >> + */
> >> +#ifdef __KERNEL__
> >> +
> >> +typedef signed char s8;
> >> +typedef unsigned char u8;
> >> +
> >> +typedef signed short s16;
> >> +typedef unsigned short u16;
> >> +
> >> +typedef signed int s32;
> >> +typedef unsigned int u32;
> >> +
> >> +typedef signed long long s64;
> >> +typedef unsigned long long u64;
> >> +
> >> +#include <asm/bitsperlong.h>
> >> +
> >> +#endif /* __KERNEL__ */
> >> +
> >> +#endif /* __ASM_RISCV_TYPES_H */
> >> diff --git a/arch/riscv/include/asm/unaligned.h b/arch/riscv/include/asm/unaligned.h
> >> new file mode 100644
> >> index 000000000..aaebc0641
> >> --- /dev/null
> >> +++ b/arch/riscv/include/asm/unaligned.h
> >> @@ -0,0 +1,19 @@
> >> +#ifndef _ASM_RISCV_UNALIGNED_H
> >> +#define _ASM_RISCV_UNALIGNED_H
> >> +
> >> +/*
> >> + * FIXME: this file is copy-n-pasted from sandbox's unaligned.h
> >> + */
> >> +
> >> +#include <linux/unaligned/access_ok.h>
> >> +#include <linux/unaligned/generic.h>
> >> +
> >> +#if __BYTE_ORDER == __LITTLE_ENDIAN
> >> +#define get_unaligned __get_unaligned_le
> >> +#define put_unaligned __put_unaligned_le
> >> +#else
> >> +#define get_unaligned __get_unaligned_be
> >> +#define put_unaligned __put_unaligned_be
> >> +#endif
> >> +
> >> +#endif /* _ASM_RISCV_UNALIGNED_H */
> >> diff --git a/arch/riscv/lib/.gitignore b/arch/riscv/lib/.gitignore
> >> new file mode 100644
> >> index 000000000..d1165788c
> >> --- /dev/null
> >> +++ b/arch/riscv/lib/.gitignore
> >> @@ -0,0 +1 @@
> >> +barebox.lds
> >> diff --git a/arch/riscv/lib/Makefile b/arch/riscv/lib/Makefile
> >> new file mode 100644
> >> index 000000000..313363c1a
> >> --- /dev/null
> >> +++ b/arch/riscv/lib/Makefile
> >> @@ -0,0 +1,9 @@
> >> +extra-$(CONFIG_GENERIC_LINKER_SCRIPT) += barebox.lds
> >> +
> >> +obj-y += riscv_timer.o
> >> +
> >> +obj-$(CONFIG_32BIT) += lshrdi3.o
> >> +obj-$(CONFIG_32BIT) += ashldi3.o
> >> +obj-$(CONFIG_32BIT) += ashrdi3.o
> >> +
> >> +obj-$(CONFIG_BUILTIN_DTB) += dtb.o
> >> diff --git a/arch/riscv/lib/ashldi3.c b/arch/riscv/lib/ashldi3.c
> >> new file mode 100644
> >> index 000000000..cbdbcbb6a
> >> --- /dev/null
> >> +++ b/arch/riscv/lib/ashldi3.c
> >> @@ -0,0 +1,28 @@
> >> +#include <module.h>
> >> +
> >> +#include "libgcc.h"
> >> +
> >> +long long __ashldi3(long long u, word_type b)
> >> +{
> >> +	DWunion uu, w;
> >> +	word_type bm;
> >> +
> >> +	if (b == 0)
> >> +		return u;
> >> +
> >> +	uu.ll = u;
> >> +	bm = 32 - b;
> >> +
> >> +	if (bm <= 0) {
> >> +		w.s.low = 0;
> >> +		w.s.high = (unsigned int) uu.s.low << -bm;
> >> +	} else {
> >> +		const unsigned int carries = (unsigned int) uu.s.low >> bm;
> >> +
> >> +		w.s.low = (unsigned int) uu.s.low << b;
> >> +		w.s.high = ((unsigned int) uu.s.high << b) | carries;
> >> +	}
> >> +
> >> +	return w.ll;
> >> +}
> >> +EXPORT_SYMBOL(__ashldi3);
> >> diff --git a/arch/riscv/lib/ashrdi3.c b/arch/riscv/lib/ashrdi3.c
> >> new file mode 100644
> >> index 000000000..928d6d97c
> >> --- /dev/null
> >> +++ b/arch/riscv/lib/ashrdi3.c
> >> @@ -0,0 +1,30 @@
> >> +#include <module.h>
> >> +
> >> +#include "libgcc.h"
> >> +
> >> +long long __ashrdi3(long long u, word_type b)
> >> +{
> >> +	DWunion uu, w> +	word_type bm;
> >> +
> >> +	if (b == 0)
> >> +		return u;
> >> +
> >> +	uu.ll = u;
> >> +	bm = 32 - b;
> >> +
> >> +	if (bm <= 0) {
> >> +		/* w.s.high = 1..1 or 0..0 */
> >> +		w.s.high =
> >> +		    uu.s.high >> 31;
> >> +		w.s.low = uu.s.high >> -bm;
> >> +	} else {
> >> +		const unsigned int carries = (unsigned int) uu.s.high << bm;
> >> +
> >> +		w.s.high = uu.s.high >> b;
> >> +		w.s.low = ((unsigned int) uu.s.low >> b) | carries;
> >> +	}
> >> +
> >> +	return w.ll;
> >> +}
> >> +EXPORT_SYMBOL(__ashrdi3);
> >> diff --git a/arch/riscv/lib/asm-offsets.c b/arch/riscv/lib/asm-offsets.c
> >> new file mode 100644
> >> index 000000000..22f382b71
> >> --- /dev/null
> >> +++ b/arch/riscv/lib/asm-offsets.c
> >> @@ -0,0 +1,12 @@
> >> +/*
> >> + * Generate definitions needed by assembly language modules.
> >> + * This code generates raw asm output which is post-processed to extract
> >> + * and format the required data.
> >> + */
> >> +
> >> +#include <linux/kbuild.h>
> >> +
> >> +int main(void)
> >> +{
> >> +	return 0;
> >> +}
> >> diff --git a/arch/riscv/lib/barebox.lds.S b/arch/riscv/lib/barebox.lds.S
> >> new file mode 100644
> >> index 000000000..9468fb8b5
> >> --- /dev/null
> >> +++ b/arch/riscv/lib/barebox.lds.S
> >> @@ -0,0 +1,89 @@
> >> +/*
> >> + * Copyright (C) 2016 Antony Pavlov <antonynpavlov@gmail.com>
> >> + *
> >> + * This file is part of barebox.
> >> + * See file CREDITS for list of people who contributed to this project.
> >> + *
> >> + * This program is free software; you can redistribute it and/or modify
> >> + * it under the terms of the GNU General Public License version 2
> >> + * as published by the Free Software Foundation.
> >> + *
> >> + * This program is distributed in the hope that it will be useful,
> >> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> >> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> >> + * GNU General Public License for more details.
> >> + *
> >> + */
> >> +
> >> +#include <asm-generic/barebox.lds.h>
> >> +
> >> +OUTPUT_ARCH(riscv)
> >> +ENTRY(_start)
> >> +SECTIONS
> >> +{
> >> +	. = TEXT_BASE;
> >> +
> >> +	. = ALIGN(8);
> >> +	.text      :
> >> +	{
> >> +		_stext = .;
> >> +		_start = .;
> >> +		KEEP(*(.text_entry*))
> >> +		_text = .;
> >> +		__bare_init_start = .;
> >> +		*(.text_bare_init*)
> >> +		__bare_init_end = .;
> >> +		*(.text*)
> >> +	}
> >> +	BAREBOX_BARE_INIT_SIZE
> >> +
> >> +	PRE_IMAGE
> >> +
> >> +	. = ALIGN(8);
> >> +	.rodata : { *(.rodata*) }
> >> +
> >> +	_etext = .;			/* End of text and rodata section */
> >> +	_sdata = .;
> >> +
> >> +	. = ALIGN(8);
> >> +	.data : { *(.data*) }
> >> +
> >> +	.barebox_imd : { BAREBOX_IMD }
> >> +
> >> +	. = ALIGN(8);
> >> +	.got : { *(.got*) }
> >> +
> >> +	. = .;
> >> +	__barebox_cmd_start = .;
> >> +	.barebox_cmd : { BAREBOX_CMDS }
> >> +	__barebox_cmd_end = .;
> >> +
> >> +	__barebox_magicvar_start = .;
> >> +	.barebox_magicvar : { BAREBOX_MAGICVARS }
> >> +	__barebox_magicvar_end = .;
> >> +
> >> +	__barebox_initcalls_start = .;
> >> +	.barebox_initcalls : { INITCALLS }
> >> +	__barebox_initcalls_end = .;
> >> +
> >> +	__barebox_exitcalls_start = .;
> >> +	.barebox_exitcalls : { EXITCALLS }
> >> +	__barebox_exitcalls_end = .;
> >> +
> >> +	__usymtab_start = .;
> >> +	__usymtab : { BAREBOX_SYMS }
> >> +	__usymtab_end = .;
> >> +
> >> +	.rela.dyn : { *(.rela*) }
> >> +
> >> +	.oftables : { BAREBOX_CLK_TABLE() }
> >> +
> >> +	.dtb : { BAREBOX_DTB() }
> >> +
> >> +	_edata = .;
> >> +	. = ALIGN(8);
> >> +	__bss_start = .;
> >> +	.bss : { *(.bss*) *(.sbss*) }
> >> +	__bss_stop = .;
> >> +	_end = .;
> >> +}
> >> diff --git a/arch/riscv/lib/dtb.c b/arch/riscv/lib/dtb.c
> >> new file mode 100644
> >> index 000000000..09f519dcc
> >> --- /dev/null
> >> +++ b/arch/riscv/lib/dtb.c
> >> @@ -0,0 +1,41 @@
> >> +/*
> >> + * Copyright (C) 2016 Antony Pavlov <antonynpavlov@gmail.com>
> >> + *
> >> + * See file CREDITS for list of people who contributed to this
> >> + * project.
> >> + *
> >> + * This program is free software; you can redistribute it and/or modify
> >> + * it under the terms of the GNU General Public License version 2
> >> + * as published by the Free Software Foundation.
> >> + *
> >> + * This program is distributed in the hope that it will be useful,
> >> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> >> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> >> + * GNU General Public License for more details.
> >> + *
> >> + */
> >> +#include <common.h>
> >> +#include <init.h>
> >> +#include <of.h>
> >> +
> >> +extern char __dtb_start[];
> >> +
> >> +static int of_riscv_init(void)
> >> +{
> >> +	struct device_node *root;
> >> +
> >> +	root = of_get_root_node();
> >> +	if (root)
> >> +		return 0;
> >> +
> >> +	root = of_unflatten_dtb(__dtb_start);
> >> +	if (!IS_ERR(root)) {
> >> +		pr_debug("using internal DTB\n");
> >> +		of_set_root_node(root);
> >> +		if (IS_ENABLED(CONFIG_OFDEVICE))
> >> +			of_probe();
> >> +	}
> >> +
> >> +	return 0;
> >> +}
> >> +core_initcall(of_riscv_init);
> >> diff --git a/arch/riscv/lib/libgcc.h b/arch/riscv/lib/libgcc.h
> >> new file mode 100644
> >> index 000000000..593e59802
> >> --- /dev/null
> >> +++ b/arch/riscv/lib/libgcc.h
> >> @@ -0,0 +1,29 @@
> >> +#ifndef __ASM_LIBGCC_H
> >> +#define __ASM_LIBGCC_H
> >> +
> >> +#include <asm/byteorder.h>
> >> +
> >> +typedef int word_type __attribute__ ((mode (__word__)));
> >> +#ifdef __BIG_ENDIAN
> >> +struct DWstruct {
> >> +	int high, low;
> >> +};
> >> +#elif defined(__LITTLE_ENDIAN)
> >> +struct DWstruct {
> >> +	int low, high;
> >> +};
> >> +#else
> >> +#error I feel sick.
> >> +#endif
> >> +
> >> +typedef union {
> >> +	struct DWstruct s;
> >> +	long long ll;
> >> +} DWunion;
> >> +
> >> +long long __lshrdi3(long long u, word_type b);
> >> +long long __ashldi3(long long u, word_type b);
> >> +long long __ashrdi3(long long u, word_type b);
> >> +
> >> +#endif /* __ASM_LIBGCC_H */
> >> diff --git a/arch/riscv/lib/lshrdi3.c b/arch/riscv/lib/lshrdi3.c
> >> new file mode 100644
> >> index 000000000..74a4846e9
> >> --- /dev/null
> >> +++ b/arch/riscv/lib/lshrdi3.c
> >> @@ -0,0 +1,28 @@
> >> +#include <module.h>
> >> +
> >> +#include "libgcc.h"
> >> +
> >> +long long __lshrdi3(long long u, word_type b)
> >> +{
> >> +	DWunion uu, w;
> >> +	word_type bm;
> >> +
> >> +	if (b == 0)
> >> +		return u;
> >> +
> >> +	uu.ll = u;
> >> +	bm = 32 - b;
> >> +
> >> +	if (bm <= 0) {
> >> +		w.s.high = 0;
> >> +		w.s.low = (unsigned int) uu.s.high >> -bm;
> >> +	} else {
> >> +		const unsigned int carries = (unsigned int) uu.s.high << bm;
> >> +
> >> +		w.s.high = (unsigned int) uu.s.high >> b;
> >> +		w.s.low = ((unsigned int) uu.s.low >> b) | carries;
> >> +	}
> >> +
> >> +	return w.ll;
> >> +}
> >> +EXPORT_SYMBOL(__lshrdi3);
> >> diff --git a/arch/riscv/lib/riscv_timer.c b/arch/riscv/lib/riscv_timer.c
> >> new file mode 100644
> >> index 000000000..46181f877
> >> --- /dev/null
> >> +++ b/arch/riscv/lib/riscv_timer.c
> >> @@ -0,0 +1,68 @@
> >> +/*
> >> + * Copyright (C) 2017 Antony Pavlov <antonynpavlov@gmail.com>
> >> + *
> >> + * This file is part of barebox.
> >> + * See file CREDITS for list of people who contributed to this project.
> >> + *
> >> + * This program is free software; you can redistribute it and/or modify
> >> + * it under the terms of the GNU General Public License version 2
> >> + * as published by the Free Software Foundation.
> >> + *
> >> + * This program is distributed in the hope that it will be useful,
> >> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> >> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> >> + * GNU General Public License for more details.
> >> + *
> >> + */
> >> +
> >> +/**
> >> + * @file
> >> + * @brief Clocksource based on RISCV cycle CSR timer
> >> + */
> >> +
> >> +#include <init.h>
> >> +#include <of.h>
> >> +#include <linux/clk.h>
> >> +#include <clock.h>
> >> +#include <io.h>
> >> +
> >> +static uint64_t rdcycle_read(void)
> >> +{
> >> +	register unsigned long __v;
> >> +
> >> +	__asm__ __volatile__ ("rdcycle %0" : "=r" (__v));
> >> +
> Maybe you should also add support for 32-bit cores.

That do you mean?

rdcycle pseudo op should return 32 low bits of cycle counter on 32-bit core.


> >> +	return __v;
> >> +}
> >> +
> >> +static struct clocksource rdcycle_cs = {
> >> +	.read	= rdcycle_read,
> >> +	.mask	= CLOCKSOURCE_MASK(32),
> >> +};
> >> +
> 
> -- 
> Mit freundlichen Grüßen,
> With best regards,
>    Daniel Schultz
> 
> 
> _______________________________________________
> barebox mailing list
> barebox@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/barebox


-- 
Best regards,
  Antony Pavlov

_______________________________________________
barebox mailing list
barebox@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/barebox

Re: [RFC v4 01/10] Add initial RISC-V architecture support

[Daniel Schultz]

Hi,

On 10/03/2017 12:21 AM, Antony Pavlov wrote:
> On Mon, 2 Oct 2017 12:08:58 +0200
> Daniel Schultz <d.schultz@phytec.de> wrote:
>
>> Hi,
>>
>>
>> On 09/29/2017 02:07 PM, Oleksij Rempel wrote:
>>> Hi,
>>>
>>> hm... mostly looks identical with existing arch
>>>
>>> Am 29.09.2017 um 01:12 schrieb Antony Pavlov:
>>>> Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
>>>> --
>>>> TODOs:
>>>>
>>>>     * split patch;
>>>> ---
>>>>    arch/riscv/Kconfig                   | 73 +++++++++++++++++++++++++++++
>>>>    arch/riscv/Makefile                  | 68 +++++++++++++++++++++++++++
>>>>    arch/riscv/boot/Makefile             |  2 +
>>>>    arch/riscv/boot/main_entry.c         | 40 ++++++++++++++++
>>>>    arch/riscv/boot/start.S              | 74 ++++++++++++++++++++++++++++++
>>>>    arch/riscv/dts/.gitignore            |  >  arch/riscv/dts/Makefile              |  9 ++++
>>>>    arch/riscv/dts/skeleton.dtsi         | 13 ++++++
>>>>    arch/riscv/include/asm/barebox.h     |  1 +
>>>>    arch/riscv/include/asm/bitops.h      | 35 ++++++++++++++
>>>>    arch/riscv/include/asm/bitsperlong.h | 10 ++++
>>>>    arch/riscv/include/asm/byteorder.h   | 10 ++++
>>>>    arch/riscv/include/asm/common.h      |  6 +++
>>>>    arch/riscv/include/asm/elf.h         | 11 +++++
>>>>    arch/riscv/include/asm/io.h          |  8 ++++
>>>>    arch/riscv/include/asm/mmu.h         |  6 +++
>>>>    arch/riscv/include/asm/posix_types.h |  1 +
>>>>    arch/riscv/include/asm/sections.h    |  1 +
>>>>    arch/riscv/include/asm/string.h      |  1 +
>>>>    arch/riscv/include/asm/swab.h        |  6 +++
>>>>    arch/riscv/include/asm/types.h       | 60 ++++++++++++++++++++++++
>>>>    arch/riscv/include/asm/unaligned.h   | 19 ++++++++
>>>>    arch/riscv/lib/.gitignore            |  1 +
>>>>    arch/riscv/lib/Makefile              |  9 ++++
>>>>    arch/riscv/lib/ashldi3.c             | 28 ++++++++++++
>>>>    arch/riscv/lib/ashrdi3.c             | 30 ++++++++++++
>>>>    arch/riscv/lib/asm-offsets.c         | 12 +++++
>>>>    arch/riscv/lib/barebox.lds.S         | 89 ++++++++++++++++++++++++++++++++++++
>>>>    arch/riscv/lib/dtb.c                 | 41 +++++++++++++++++
>>>>    arch/riscv/lib/libgcc.h              | 29 ++++++++++++
>>>>    arch/riscv/lib/lshrdi3.c             | 28 ++++++++++++
>>>>    arch/riscv/lib/riscv_timer.c         | 68 +++++++++++++++++++++++++++
>>>>    drivers/of/Kconfig                   |  2 +-
>>>>    33 files changed, 791 insertions(+), 1 deletion(-)
>>>>
>>>> diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
>>>> new file mode 100644
>>>> index 000000000..b2f0817ef
>>>> --- /dev/null
>>>> +++ b/arch/riscv/Kconfig
>>>> @@ -0,0 +1,73 @@
>>>> +config RISCV
>>>> +	bool
>>>> +	select GENERIC_FIND_NEXT_BIT
>>>> +	select HAVE_CONFIGURABLE_MEMORY_LAYOUT
>>>> +	select HAVE_CONFIGURABLE_TEXT_BASE
>>>> +	select GPIOLIB
>>>> +	select OFTREE
>>>> +	select COMMON_CLK
>>>> +	select COMMON_CLK_OF_PROVIDER
>>>> +	select CLKDEV_LOOKUP
>>>> +	default y
>>>> +
>>>> +config ARCH_TEXT_BASE
>>>> +	hex
>>>> +	default 0x0
>>>> +
>>>> +config GENERIC_LINKER_SCRIPT
>>>> +	bool
>>>> +	default y
>>>> +
>>>> +menu "Machine selection"
>>>> +
>>>> +choice
>>>> +	prompt "CPU selection"
>>>> +	default CPU_RV_GENERIC
>>>> +
>>>> +config CPU_RV_GENERIC
>>>> +	bool "Generic RISC-V"
>>>> +	select CPU_SUPPORTS_32BIT_KERNEL
>>>> +	select CPU_SUPPORTS_64BIT_KERNEL
>>>> +
>>>> +endchoice
>>>> +
>>>> +config CPU_SUPPORTS_32BIT_KERNEL
>>>> +	bool
>>>> +config CPU_SUPPORTS_64BIT_KERNEL
>>>> +	bool
>>>> +
>>>> +choice
>>>> +	prompt "barebox code model"
>>>> +	default 64BIT
>>>> +
>>>> +config 32BIT
>>>> +	bool "32-bit barebox"
>>>> +	depends on CPU_SUPPORTS_32BIT_KERNEL
>>>> +	help
>>>> +	  Select this option to build a 32-bit barebox.
>>>> +
>>>> +config 64BIT
>>>> +	bool "64-bit barebox"
>>>> +	depends on CPU_SUPPORTS_64BIT_KERNEL
>>>> +	help
>>>> +	  Select this option to build a 64-bit barebox.
>>>> +
>>>> +endchoice
>>>> +
>>>> +config BUILTIN_DTB
>>>> +	bool "link a DTB into the barebox image"
>>>> +	depends on OFTREE
>>>> +
>>>> +config BUILTIN_DTB_NAME
>>>> +	string "DTB to build into the barebox image"
>>>> +	depends on BUILTIN_DTB
>>>> +
>>>> +endmenu
>>>> +
>>>> +source common/Kconfig
>>>> +source commands/Kconfig
>>>> +source net/Kconfig
>>>> +source drivers/Kconfig
>>>> +source fs/Kconfig
>>>> +source lib/Kconfig
>>>> +source crypto/Kconfig
>>>> diff --git a/arch/riscv/Makefile b/arch/riscv/Makefile
>>>> new file mode 100644
>>>> index 000000000..4e3318cf1
>>>> --- /dev/null
>>>> +++ b/arch/riscv/Makefile
>>>> @@ -0,0 +1,68 @@
>>>> +CPPFLAGS += -fno-strict-aliasing
>>>> +
>>>> +cflags-y += -fno-pic -pipe
>>>> +cflags-y += -Wall -Wmissing-prototypes -Wstrict-prototypes \
>>>> +	-Wno-uninitialized -Wno-format -Wno-main -mcmodel=medany
>>>> +
>>>> +LDFLAGS += $(ldflags-y)
>>>> +LDFLAGS_barebox += -nostdlib
>>>> +
>>>> +TEXT_BASE = $(CONFIG_TEXT_BASE)
>>>> +CPPFLAGS += -DTEXT_BASE=$(CONFIG_TEXT_BASE)
>>>> +
>>>> +ifndef CONFIG_MODULES
>>>> +# Add cleanup flags
>>>> +CPPFLAGS += -fdata-sections -ffunction-sections
>>>> +LDFLAGS_barebox += -static --gc-sections
>>>> +endif
>>>> +
>>>> +KBUILD_BINARY := barebox.bin
>>>> +
>>>> +machdirs := $(patsubst %,arch/riscv/mach-%/,$(machine-y))
>>>> +
>>>> +ifneq ($(board-y),)
>>>> +BOARD := arch/riscv/boards/$(board-y)/
>>>> +else
>>>> +BOARD :=
>>>> +endif
>>>> +
>>>> +ifeq ($(KBUILD_SRC),)
>>>> +CPPFLAGS += -I$(BOARD)/include
>>>> +else
>>>> +CPPFLAGS += -I$(srctree)/$(BOARD)/include
>>>> +endif
>>>> +
>>>> +ifeq ($(KBUILD_SRC),)
>>>> +CPPFLAGS += $(patsubst %,-I%include,$(machdirs))
>>>> +else
>>>> +CPPFLAGS += $(patsubst %,-I$(srctree)/%include,$(machdirs))
>>>> +endif
>>>> +
>>>> +archprepare: maketools
>>>> +
>>>> +PHONY += maketools
>>>> +
>>>> +ifneq ($(machine-y),)
>>>> +MACH  := arch/riscv/mach-$(machine-y)/
>>>> +else
>>>> +MACH  :=
>>>> +endif
>>>> +
>>>> +ifneq ($(board-y),)
>>>> +BOARD := arch/riscv/boards/$(board-y)/
>>>> +else
>>>> +BOARD :=
>>>> +endif
>>>> +
>>>> +common-y += $(BOARD) $(MACH)
>>>> +common-y += arch/riscv/lib/
>>>> +common-y += arch/riscv/boot/
>>>> +
>>>> +common-$(CONFIG_OFTREE) += arch/riscv/dts/
>>>> +
>>>> +CPPFLAGS += $(cflags-y)
>>>> +CFLAGS += $(cflags-y)
>>>> +
>>>> +lds-y	:= arch/riscv/lib/barebox.lds
>>>> +
>>>> +CLEAN_FILES += arch/riscv/lib/barebox.lds
>>>> diff --git a/arch/riscv/boot/Makefile b/arch/riscv/boot/Makefile
>>>> new file mode 100644
>>>> index 000000000..d6d28ce65
>>>> --- /dev/null
>>>> +++ b/arch/riscv/boot/Makefile
>>>> @@ -0,0 +1,2 @@
>>>> +obj-y += start.o
>>>> +obj-y += main_entry.o
>>>> diff --git a/arch/riscv/boot/main_entry.c b/arch/riscv/boot/main_entry.c
>>>> new file mode 100644
>>>> index 000000000..18db86da5
>>>> --- /dev/null
>>>> +++ b/arch/riscv/boot/main_entry.c
>>>> @@ -0,0 +1,40 @@
>>>> +/*
>>>> + * Copyright (C) 2016 Antony Pavlov <antonynpavlov@gmail.com>
>>>> + *
>>>> + * This file is part of barebox.
>>>> + * See file CREDITS for list of people who contributed to this project.
>>>> + *
>>>> + * This program is free software; you can redistribute it and/or
>>>> + * modify it under the terms of the GNU General Public License as
>>>> + * published by the Free Software Foundation; either version 2 of
>>>> + * the License, or (at your option) any later version.
>>>> + *
>>>> + * This program is distributed in the hope that it will be useful,
>>>> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
>>>> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
>>>> + * GNU General Public License for more details.
>>>> + *
>>>> + */
>>>> +
>>>> +#include <common.h>
>>>> +#include <memory.h>
>>>> +#include <asm-generic/memory_layout.h>
>>>> +#include <asm/sections.h>
>>>> +
>>>> +void main_entry(void);
>>>> +
>>>> +/**
>>>> + * Called plainly from assembler code
>>>> + *
>>>> + * @note The C environment isn't initialized yet
>>>> + */
>>>> +void main_entry(void)
>>>> +{
>>>> +	/* clear the BSS first */
>>>> +	memset(__bss_start, 0x00, __bss_stop - __bss_start);
>>>> +
>>>> +	mem_malloc_init((void *)MALLOC_BASE,
>>>> +			(void *)(MALLOC_BASE + MALLOC_SIZE - 1));
>>>> +
>>>> +	start_barebox();
>>>> +}
>>>> diff --git a/arch/riscv/boot/start.S b/arch/riscv/boot/start.S
>>>> new file mode 100644
>>>> index 000000000..2fd00f63d
>>>> --- /dev/null
>>>> +++ b/arch/riscv/boot/start.S
>>>> @@ -0,0 +1,74 @@
>>>> +/*
>>>> + * Startup Code for MIPS CPU
>>>> + *
>>>> + * based on coreboot/src/arch/riscv/bootblock.S
>>>> + *
>>>> + * Copyright (C) 2016 Antony Pavlov <antonynpavlov@gmail.com>
>>>> + *
>>>> + * This file is part of barebox.
>>>> + * See file CREDITS for list of people who contributed to this project.
>>>> + *
>>>> + * This program is free software; you can redistribute it and/or modify
>>>> + * it under the terms of the GNU General Public License version 2
>>>> + * as published by the Free Software Foundation.
>>>> + *
>>>> + * This program is distributed in the hope that it will be useful,
>>>> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
>>>> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
>>>> + * GNU General Public License for more details.
>>>> + *
>>>> + */
>>>> +
>>>> +#include <asm-generic/memory_layout.h>
>>>> +
>>>> +	.text
>>>> +	.section ".text_entry"
>>>> +	.align 2
>>>> +
>>>> +.globl _start
>>>> +_start:
>>>> +	li sp, STACK_BASE + STACK_SIZE
>>>> +
>>>> +	# make room for HLS and initialize it
>>>> +	addi sp, sp, -64 /* MENTRY_FRAME_SIZE */
>>>> +
>>>> +	# poison the stack
>>>> +	li t1, STACK_BASE
>>>> +	li t0, 0xdeadbeef
>>>> +	sw t0, 0(t1)
>>>> +
>>>> +	# clear any pending interrupts
>>>> +	//csrwi mip, 0
>>> should be removed.
>>>
>>>> +	/* copy barebox to link location */
>>>> +
>>>> +	la	a0, _start	/* a0 <- _start actual address */
>>>> +	li	a1, CONFIG_TEXT_BASE	/* a1 <- _start link address */
>>>> +
>>>> +	beq	a0, a1, main_entry
>>>> +
>>>> +	la	a2, __bss_start
>>>> +
>>>> +#define LONGSIZE 4
>>>> +
>>>> +copy_loop:
>>>> +	/* copy from source address [a0] */
>>>> +	lw	t0, LONGSIZE * 0(a0)
>>>> +	lw	t1, LONGSIZE * 1(a0)
>>>> +	lw	t2, LONGSIZE * 2(a0)
>>>> +	lw	t3, LONGSIZE * 3(a0)
>>>> +	/* copy to target address [a1] */
>>>> +	sw	t0, LONGSIZE * 0(a1)
>>>> +	sw	t1, LONGSIZE * 1(a1)
>>>> +	sw	t2, LONGSIZE * 2(a1)
>>>> +	sw	t3, LONGSIZE * 3(a1)
>>>> +	addi	a0, a0, LONGSIZE * 2
>>>> +	addi	a1, a1, LONGSIZE * 2
>>>> +	bgeu	a2, a0, copy_loop
>>>> +
>>>> +	/* Alas! At the moment I can't load main_entry __link__ address
>>>> +	   into a0 with la. Use CONFIG_TEXT_BASE instead. This solution
>>>> +	   leads to extra cycles for repeat sp initialization. */
>>>> +
>>>> +	li	a0, CONFIG_TEXT_BASE
>>>> +	jalr	a0
>>>> diff --git a/arch/riscv/dts/.gitignore b/arch/riscv/dts/.gitignore
>>>> new file mode 100644
>>>> index 000000000..077903c50
>>>> --- /dev/null
>>>> +++ b/arch/riscv/dts/.gitignore
>>>> @@ -0,0 +1 @@
>>>> +*dtb*
>>>> diff --git a/arch/riscv/dts/Makefile b/arch/riscv/dts/Makefile
>>>> new file mode 100644
>>>> index 000000000..f8380b11c
>>>> --- /dev/null
>>>> +++ b/arch/riscv/dts/Makefile
>>>> @@ -0,0 +1,9 @@
>>>> +BUILTIN_DTB := $(patsubst "%",%,$(CONFIG_BUILTIN_DTB_NAME))
>>>> +obj-$(CONFIG_BUILTIN_DTB) += $(BUILTIN_DTB).dtb.o
>>>> +
>>>> +# just to build a built-in.o. Otherwise compilation fails when no devicetree is
>>>> +# created.
>>>> +obj- += dummy.o
>>>> +
>>>> +always := $(dtb-y)
>>>> +clean-files := *.dtb *.dtb.S .*.dtc .*.pre .*.dts
>>>> diff --git a/arch/riscv/dts/skeleton.dtsi b/arch/riscv/dts/skeleton.dtsi
>>>> new file mode 100644
>>>> index 000000000..38ead821b
>>>> --- /dev/null
>>>> +++ b/arch/riscv/dts/skeleton.dtsi
>>>> @@ -0,0 +1,13 @@
>>>> +/*
>>>> + * Skeleton device tree; the bare minimum needed to boot; just include and
>>>> + * add a compatible value.  The bootloader will typically populate the memory
>>>> + * node.
>>>> + */
>>>> +
>>>> +/ {
>>>> +	#address-cells = <2>;
>>>> +	#size-cells = <1>;
>>>> +	chosen { };
>>>> +	aliases { };
>>>> +	memory { device_type = "memory"; reg = <0 0 0>; };
>>> "reg = <0 0>" instead?
>>>
>>>> +};
>>>> diff --git a/arch/riscv/include/asm/barebox.h b/arch/riscv/include/asm/barebox.h
>>>> new file mode 100644
>>>> index 000000000..2997587d8
>>>> --- /dev/null
>>>> +++ b/arch/riscv/include/asm/barebox.h
>>>> @@ -0,0 +1 @@
>>>> +/* dummy */
>>>> diff --git a/arch/riscv/include/asm/bitops.h b/arch/riscv/include/asm/bitops.h
>>>> new file mode 100644
>>>> index 000000000..e77ab8320
>>>> --- /dev/null
>>>> +++ b/arch/riscv/include/asm/bitops.h
>>>> @@ -0,0 +1,35 @@
>>>> +/*
>>>> + * This program is free software; you can redistribute it and/or
>>>> + * modify it under the terms of the GNU General Public License as
>>>> + * published by the Free Software Foundation; either version 2 of
>>>> + * the License, or (at your option) any later version.
>>>> + *
>>>> + * This program is distributed in the hope that it will be useful,
>>>> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
>>>> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
>>>> + * GNU General Public License for more details.
>>>> + *
>>>> + *
>>>> + */
>>>> +
>>>> +#ifndef _ASM_BITOPS_H_
>>>> +#define _ASM_BITOPS_H_
>>>> +
>>>> +#include <asm-generic/bitops/__ffs.h>
>>>> +#include <asm-generic/bitops/__fls.h>
>>>> +#include <asm-generic/bitops/ffs.h>
>>>> +#include <asm-generic/bitops/fls.h>
>>>> +#include <asm-generic/bitops/ffz.h>
>>>> +#include <asm-generic/bitops/hweight.h>
>>>> +#include <asm-generic/bitops/fls64.h>
>>>> +#include <asm-generic/bitops/find.h>
>>>> +#include <asm-generic/bitops/ops.h>
>>>> +
>>>> +#define set_bit(x, y)			__set_bit(x, y)
>>>> +#define clear_bit(x, y)			__clear_bit(x, y)
>>>> +#define change_bit(x, y)		__change_bit(x, y)
>>>> +#define test_and_set_bit(x, y)		__test_and_set_bit(x, y)
>>>> +#define test_and_clear_bit(x, y)	__test_and_clear_bit(x, y)
>>>> +#define test_and_change_bit(x, y)	__test_and_change_bit(x, y)
>>>> +
>>>> +#endif /* _ASM_BITOPS_H_ */
>>>> diff --git a/arch/riscv/include/asm/bitsperlong.h b/arch/riscv/include/asm/bitsperlong.h
>>>> new file mode 100644
>>>> index 000000000..4641e7e48
>>>> --- /dev/null
>>>> +++ b/arch/riscv/include/asm/bitsperlong.h
>>>> @@ -0,0 +1,10 @@
>>>> +#ifndef __ASM_BITSPERLONG_H
>>>> +#define __ASM_BITSPERLONG_H
>>>> +
>>>> +#ifdef __riscv64
>>>> +#define BITS_PER_LONG 64
>>>> +#else
>>>> +#define BITS_PER_LONG 32
>>>> +#endif
>>>> +
>>>> +#endif /* __ASM_BITSPERLONG_H */
>>>> diff --git a/arch/riscv/include/asm/byteorder.h b/arch/riscv/include/asm/byteorder.h
>>>> new file mode 100644
>>>> index 000000000..778bb7224
>>>> --- /dev/null
>>>> +++ b/arch/riscv/include/asm/byteorder.h
>>>> @@ -0,0 +1,10 @@
>>>> +#ifndef _ASM_RISCV_BYTEORDER_H
>>>> +#define _ASM_RISCV_BYTEORDER_H
>>>> +
>>>> +#if defined(__RISCVEB__)
>>>> +#include <linux/byteorder/big_endian.h>
>>>> +#else
>>>> +#include <linux/byteorder/little_endian.h>
>>>> +#endif
>>>> +
>>>> +#endif /* _ASM_RISCV_BYTEORDER_H */
>>>> diff --git a/arch/riscv/include/asm/common.h b/arch/riscv/include/asm/common.h
>>>> new file mode 100644
>>>> index 000000000..bc8a17e30
>>>> --- /dev/null
>>>> +++ b/arch/riscv/include/asm/common.h
>>>> @@ -0,0 +1,6 @@
>>>> +#ifndef ASM_RISCV_COMMON_H
>>>> +#define ASM_RISCV_COMMON_H
>>>> +
>>>> +/* nothing special yet */
>>>> +
>>>> +#endif /* ASM_RISCV_COMMON_H */
>>>> diff --git a/arch/riscv/include/asm/elf.h b/arch/riscv/include/asm/elf.h
>>>> new file mode 100644
>>>> index 000000000..7134fa058
>>>> --- /dev/null
>>>> +++ b/arch/riscv/include/asm/elf.h
>>>> @@ -0,0 +1,11 @@
>>>> +#ifndef __ASM_RISCV_ELF_H__
>>>> +#define __ASM_RISCV_ELF_H__
>>>> +
>>>> +#if __SIZEOF_POINTER__ == 8
>>>> +#define ELF_CLASS	ELFCLASS64
>>>> +#define CONFIG_PHYS_ADDR_T_64BIT
>>>> +#else
>>>> +#define ELF_CLASS	ELFCLASS32
>>>> +#endif
>>>> +
>>>> +#endif /* __ASM_RISCV_ELF_H__ */
>>>> diff --git a/arch/riscv/include/asm/io.h b/arch/riscv/include/asm/io.h
>>>> new file mode 100644
>>>> index 000000000..3cdea7fca
>>>> --- /dev/null
>>>> +++ b/arch/riscv/include/asm/io.h
>>>> @@ -0,0 +1,8 @@
>>>> +#ifndef __ASM_RISCV_IO_H
>>>> +#define __ASM_RISCV_IO_H
>>>> +
>>>> +#define IO_SPACE_LIMIT 0
>>>> +
>>>> +#include <asm-generic/io.h>
>>>> +
>>>> +#endif /* __ASM_RISCV_IO_H */
>>>> diff --git a/arch/riscv/include/asm/mmu.h b/arch/riscv/include/asm/mmu.h
>>>> new file mode 100644
>>>> index 000000000..95af87142
>>>> --- /dev/null
>>>> +++ b/arch/riscv/include/asm/mmu.h
>>>> @@ -0,0 +1,6 @@
>>>> +#ifndef __ASM_MMU_H
>>>> +#define __ASM_MMU_H
>>>> +
>>>> +#define MAP_ARCH_DEFAULT MAP_UNCACHED
>>>> +
>>>> +#endif /* __ASM_MMU_H */
>>>> diff --git a/arch/riscv/include/asm/posix_types.h b/arch/riscv/include/asm/posix_types.h
>>>> new file mode 100644
>>>> index 000000000..22cae6230
>>>> --- /dev/null
>>>> +++ b/arch/riscv/include/asm/posix_types.h
>>>> @@ -0,0 +1 @@
>>>> +#include <asm-generic/posix_types.h>
>>>> diff --git a/arch/riscv/include/asm/sections.h b/arch/riscv/include/asm/sections.h
>>>> new file mode 100644
>>>> index 000000000..2b8c51603
>>>> --- /dev/null
>>>> +++ b/arch/riscv/include/asm/sections.h
>>>> @@ -0,0 +1 @@
>>>> +#include <asm-generic/sections.h>
>>>> diff --git a/arch/riscv/include/asm/string.h b/arch/riscv/include/asm/string.h
>>>> new file mode 100644
>>>> index 000000000..2997587d8
>>>> --- /dev/null
>>>> +++ b/arch/riscv/include/asm/string.h
>>>> @@ -0,0 +1 @@
>>>> +/* dummy */
>>>> diff --git a/arch/riscv/include/asm/swab.h b/arch/riscv/include/asm/swab.h
>>>> new file mode 100644
>>>> index 000000000..60a90120b
>>>> --- /dev/null
>>>> +++ b/arch/riscv/include/asm/swab.h
>>>> @@ -0,0 +1,6 @@
>>>> +#ifndef _ASM_SWAB_H
>>>> +#define _ASM_SWAB_H
>>>> +
>>>> +/* nothing. use generic functions */
>>>> +
>>>> +#endif /* _ASM_SWAB_H */
>>>> diff --git a/arch/riscv/include/asm/types.h b/arch/riscv/include/asm/types.h
>>>> new file mode 100644
>>>> index 000000000..ba386ab4c
>>>> --- /dev/null
>>>> +++ b/arch/riscv/include/asm/types.h
>>>> @@ -0,0 +1,60 @@
>>>> +#ifndef __ASM_RISCV_TYPES_H
>>>> +#define __ASM_RISCV_TYPES_H
>>>> +
>>>> +#ifdef __riscv64
>>>> +/*
>>>> + * This is used in dlmalloc. On RISCV64 we need it to be 64 bit
>>>> + */
>>>> +#define INTERNAL_SIZE_T unsigned long
>>>> +
>>>> +/*
>>>> + * This is a Kconfig variable in the Kernel, but we want to detect
>>>> + * this during compile time, so we set it here.
>>>> + */
>>>> +#define CONFIG_PHYS_ADDR_T_64BIT
>>>> +
>>>> +#endif
>>>> +
>>>> +typedef unsigned short umode_t;
>>>> +
>>>> +/*
>>>> + * __xx is ok: it doesn't pollute the POSIX namespace. Use these in the
>>>> + * header files exported to user space
>>>> + */
>>>> +
>>>> +typedef __signed__ char __s8;
>>>> +typedef unsigned char __u8;
>>>> +
>>>> +typedef __signed__ short __s16;
>>>> +typedef unsigned short __u16;
>>>> +
>>>> +typedef __signed__ int __s32;
>>>> +typedef unsigned int __u32;
>>>> +
>>>> +#if defined(__GNUC__) && !defined(__STRICT_ANSI__)
>>>> +typedef __signed__ long long __s64;
>>>> +typedef unsigned long long __u64;
>>>> +#endif
>>>> +
>>>> +/*
>>>> + * These aren't exported outside the kernel to avoid name space clashes
>>>> + */
>>>> +#ifdef __KERNEL__
>>>> +
>>>> +typedef signed char s8;
>>>> +typedef unsigned char u8;
>>>> +
>>>> +typedef signed short s16;
>>>> +typedef unsigned short u16;
>>>> +
>>>> +typedef signed int s32;
>>>> +typedef unsigned int u32;
>>>> +
>>>> +typedef signed long long s64;
>>>> +typedef unsigned long long u64;
>>>> +
>>>> +#include <asm/bitsperlong.h>
>>>> +
>>>> +#endif /* __KERNEL__ */
>>>> +
>>>> +#endif /* __ASM_RISCV_TYPES_H */
>>>> diff --git a/arch/riscv/include/asm/unaligned.h b/arch/riscv/include/asm/unaligned.h
>>>> new file mode 100644
>>>> index 000000000..aaebc0641
>>>> --- /dev/null
>>>> +++ b/arch/riscv/include/asm/unaligned.h
>>>> @@ -0,0 +1,19 @@
>>>> +#ifndef _ASM_RISCV_UNALIGNED_H
>>>> +#define _ASM_RISCV_UNALIGNED_H
>>>> +
>>>> +/*
>>>> + * FIXME: this file is copy-n-pasted from sandbox's unaligned.h
>>>> + */
>>>> +
>>>> +#include <linux/unaligned/access_ok.h>
>>>> +#include <linux/unaligned/generic.h>
>>>> +
>>>> +#if __BYTE_ORDER == __LITTLE_ENDIAN
>>>> +#define get_unaligned __get_unaligned_le
>>>> +#define put_unaligned __put_unaligned_le
>>>> +#else
>>>> +#define get_unaligned __get_unaligned_be
>>>> +#define put_unaligned __put_unaligned_be
>>>> +#endif
>>>> +
>>>> +#endif /* _ASM_RISCV_UNALIGNED_H */
>>>> diff --git a/arch/riscv/lib/.gitignore b/arch/riscv/lib/.gitignore
>>>> new file mode 100644
>>>> index 000000000..d1165788c
>>>> --- /dev/null
>>>> +++ b/arch/riscv/lib/.gitignore
>>>> @@ -0,0 +1 @@
>>>> +barebox.lds
>>>> diff --git a/arch/riscv/lib/Makefile b/arch/riscv/lib/Makefile
>>>> new file mode 100644
>>>> index 000000000..313363c1a
>>>> --- /dev/null
>>>> +++ b/arch/riscv/lib/Makefile
>>>> @@ -0,0 +1,9 @@
>>>> +extra-$(CONFIG_GENERIC_LINKER_SCRIPT) += barebox.lds
>>>> +
>>>> +obj-y += riscv_timer.o
>>>> +
>>>> +obj-$(CONFIG_32BIT) += lshrdi3.o
>>>> +obj-$(CONFIG_32BIT) += ashldi3.o
>>>> +obj-$(CONFIG_32BIT) += ashrdi3.o
>>>> +
>>>> +obj-$(CONFIG_BUILTIN_DTB) += dtb.o
>>>> diff --git a/arch/riscv/lib/ashldi3.c b/arch/riscv/lib/ashldi3.c
>>>> new file mode 100644
>>>> index 000000000..cbdbcbb6a
>>>> --- /dev/null
>>>> +++ b/arch/riscv/lib/ashldi3.c
>>>> @@ -0,0 +1,28 @@
>>>> +#include <module.h>
>>>> +
>>>> +#include "libgcc.h"
>>>> +
>>>> +long long __ashldi3(long long u, word_type b)
>>>> +{
>>>> +	DWunion uu, w;
>>>> +	word_type bm;
>>>> +
>>>> +	if (b == 0)
>>>> +		return u;
>>>> +
>>>> +	uu.ll = u;
>>>> +	bm = 32 - b;
>>>> +
>>>> +	if (bm <= 0) {
>>>> +		w.s.low = 0;
>>>> +		w.s.high = (unsigned int) uu.s.low << -bm;
>>>> +	} else {
>>>> +		const unsigned int carries = (unsigned int) uu.s.low >> bm;
>>>> +
>>>> +		w.s.low = (unsigned int) uu.s.low << b;
>>>> +		w.s.high = ((unsigned int) uu.s.high << b) | carries;
>>>> +	}
>>>> +
>>>> +	return w.ll;
>>>> +}
>>>> +EXPORT_SYMBOL(__ashldi3);
>>>> diff --git a/arch/riscv/lib/ashrdi3.c b/arch/riscv/lib/ashrdi3.c
>>>> new file mode 100644
>>>> index 000000000..928d6d97c
>>>> --- /dev/null
>>>> +++ b/arch/riscv/lib/ashrdi3.c
>>>> @@ -0,0 +1,30 @@
>>>> +#include <module.h>
>>>> +
>>>> +#include "libgcc.h"
>>>> +
>>>> +long long __ashrdi3(long long u, word_type b)
>>>> +{
>>>> +	DWunion uu, w> +	word_type bm;
>>>> +
>>>> +	if (b == 0)
>>>> +		return u;
>>>> +
>>>> +	uu.ll = u;
>>>> +	bm = 32 - b;
>>>> +
>>>> +	if (bm <= 0) {
>>>> +		/* w.s.high = 1..1 or 0..0 */
>>>> +		w.s.high =
>>>> +		    uu.s.high >> 31;
>>>> +		w.s.low = uu.s.high >> -bm;
>>>> +	} else {
>>>> +		const unsigned int carries = (unsigned int) uu.s.high << bm;
>>>> +
>>>> +		w.s.high = uu.s.high >> b;
>>>> +		w.s.low = ((unsigned int) uu.s.low >> b) | carries;
>>>> +	}
>>>> +
>>>> +	return w.ll;
>>>> +}
>>>> +EXPORT_SYMBOL(__ashrdi3);
>>>> diff --git a/arch/riscv/lib/asm-offsets.c b/arch/riscv/lib/asm-offsets.c
>>>> new file mode 100644
>>>> index 000000000..22f382b71
>>>> --- /dev/null
>>>> +++ b/arch/riscv/lib/asm-offsets.c
>>>> @@ -0,0 +1,12 @@
>>>> +/*
>>>> + * Generate definitions needed by assembly language modules.
>>>> + * This code generates raw asm output which is post-processed to extract
>>>> + * and format the required data.
>>>> + */
>>>> +
>>>> +#include <linux/kbuild.h>
>>>> +
>>>> +int main(void)
>>>> +{
>>>> +	return 0;
>>>> +}
>>>> diff --git a/arch/riscv/lib/barebox.lds.S b/arch/riscv/lib/barebox.lds.S
>>>> new file mode 100644
>>>> index 000000000..9468fb8b5
>>>> --- /dev/null
>>>> +++ b/arch/riscv/lib/barebox.lds.S
>>>> @@ -0,0 +1,89 @@
>>>> +/*
>>>> + * Copyright (C) 2016 Antony Pavlov <antonynpavlov@gmail.com>
>>>> + *
>>>> + * This file is part of barebox.
>>>> + * See file CREDITS for list of people who contributed to this project.
>>>> + *
>>>> + * This program is free software; you can redistribute it and/or modify
>>>> + * it under the terms of the GNU General Public License version 2
>>>> + * as published by the Free Software Foundation.
>>>> + *
>>>> + * This program is distributed in the hope that it will be useful,
>>>> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
>>>> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
>>>> + * GNU General Public License for more details.
>>>> + *
>>>> + */
>>>> +
>>>> +#include <asm-generic/barebox.lds.h>
>>>> +
>>>> +OUTPUT_ARCH(riscv)
>>>> +ENTRY(_start)
>>>> +SECTIONS
>>>> +{
>>>> +	. = TEXT_BASE;
>>>> +
>>>> +	. = ALIGN(8);
>>>> +	.text      :
>>>> +	{
>>>> +		_stext = .;
>>>> +		_start = .;
>>>> +		KEEP(*(.text_entry*))
>>>> +		_text = .;
>>>> +		__bare_init_start = .;
>>>> +		*(.text_bare_init*)
>>>> +		__bare_init_end = .;
>>>> +		*(.text*)
>>>> +	}
>>>> +	BAREBOX_BARE_INIT_SIZE
>>>> +
>>>> +	PRE_IMAGE
>>>> +
>>>> +	. = ALIGN(8);
>>>> +	.rodata : { *(.rodata*) }
>>>> +
>>>> +	_etext = .;			/* End of text and rodata section */
>>>> +	_sdata = .;
>>>> +
>>>> +	. = ALIGN(8);
>>>> +	.data : { *(.data*) }
>>>> +
>>>> +	.barebox_imd : { BAREBOX_IMD }
>>>> +
>>>> +	. = ALIGN(8);
>>>> +	.got : { *(.got*) }
>>>> +
>>>> +	. = .;
>>>> +	__barebox_cmd_start = .;
>>>> +	.barebox_cmd : { BAREBOX_CMDS }
>>>> +	__barebox_cmd_end = .;
>>>> +
>>>> +	__barebox_magicvar_start = .;
>>>> +	.barebox_magicvar : { BAREBOX_MAGICVARS }
>>>> +	__barebox_magicvar_end = .;
>>>> +
>>>> +	__barebox_initcalls_start = .;
>>>> +	.barebox_initcalls : { INITCALLS }
>>>> +	__barebox_initcalls_end = .;
>>>> +
>>>> +	__barebox_exitcalls_start = .;
>>>> +	.barebox_exitcalls : { EXITCALLS }
>>>> +	__barebox_exitcalls_end = .;
>>>> +
>>>> +	__usymtab_start = .;
>>>> +	__usymtab : { BAREBOX_SYMS }
>>>> +	__usymtab_end = .;
>>>> +
>>>> +	.rela.dyn : { *(.rela*) }
>>>> +
>>>> +	.oftables : { BAREBOX_CLK_TABLE() }
>>>> +
>>>> +	.dtb : { BAREBOX_DTB() }
>>>> +
>>>> +	_edata = .;
>>>> +	. = ALIGN(8);
>>>> +	__bss_start = .;
>>>> +	.bss : { *(.bss*) *(.sbss*) }
>>>> +	__bss_stop = .;
>>>> +	_end = .;
>>>> +}
>>>> diff --git a/arch/riscv/lib/dtb.c b/arch/riscv/lib/dtb.c
>>>> new file mode 100644
>>>> index 000000000..09f519dcc
>>>> --- /dev/null
>>>> +++ b/arch/riscv/lib/dtb.c
>>>> @@ -0,0 +1,41 @@
>>>> +/*
>>>> + * Copyright (C) 2016 Antony Pavlov <antonynpavlov@gmail.com>
>>>> + *
>>>> + * See file CREDITS for list of people who contributed to this
>>>> + * project.
>>>> + *
>>>> + * This program is free software; you can redistribute it and/or modify
>>>> + * it under the terms of the GNU General Public License version 2
>>>> + * as published by the Free Software Foundation.
>>>> + *
>>>> + * This program is distributed in the hope that it will be useful,
>>>> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
>>>> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
>>>> + * GNU General Public License for more details.
>>>> + *
>>>> + */
>>>> +#include <common.h>
>>>> +#include <init.h>
>>>> +#include <of.h>
>>>> +
>>>> +extern char __dtb_start[];
>>>> +
>>>> +static int of_riscv_init(void)
>>>> +{
>>>> +	struct device_node *root;
>>>> +
>>>> +	root = of_get_root_node();
>>>> +	if (root)
>>>> +		return 0;
>>>> +
>>>> +	root = of_unflatten_dtb(__dtb_start);
>>>> +	if (!IS_ERR(root)) {
>>>> +		pr_debug("using internal DTB\n");
>>>> +		of_set_root_node(root);
>>>> +		if (IS_ENABLED(CONFIG_OFDEVICE))
>>>> +			of_probe();
>>>> +	}
>>>> +
>>>> +	return 0;
>>>> +}
>>>> +core_initcall(of_riscv_init);
>>>> diff --git a/arch/riscv/lib/libgcc.h b/arch/riscv/lib/libgcc.h
>>>> new file mode 100644
>>>> index 000000000..593e59802
>>>> --- /dev/null
>>>> +++ b/arch/riscv/lib/libgcc.h
>>>> @@ -0,0 +1,29 @@
>>>> +#ifndef __ASM_LIBGCC_H
>>>> +#define __ASM_LIBGCC_H
>>>> +
>>>> +#include <asm/byteorder.h>
>>>> +
>>>> +typedef int word_type __attribute__ ((mode (__word__)));
>>>> +#ifdef __BIG_ENDIAN
>>>> +struct DWstruct {
>>>> +	int high, low;
>>>> +};
>>>> +#elif defined(__LITTLE_ENDIAN)
>>>> +struct DWstruct {
>>>> +	int low, high;
>>>> +};
>>>> +#else
>>>> +#error I feel sick.
>>>> +#endif
>>>> +
>>>> +typedef union {
>>>> +	struct DWstruct s;
>>>> +	long long ll;
>>>> +} DWunion;
>>>> +
>>>> +long long __lshrdi3(long long u, word_type b);
>>>> +long long __ashldi3(long long u, word_type b);
>>>> +long long __ashrdi3(long long u, word_type b);
>>>> +
>>>> +#endif /* __ASM_LIBGCC_H */
>>>> diff --git a/arch/riscv/lib/lshrdi3.c b/arch/riscv/lib/lshrdi3.c
>>>> new file mode 100644
>>>> index 000000000..74a4846e9
>>>> --- /dev/null
>>>> +++ b/arch/riscv/lib/lshrdi3.c
>>>> @@ -0,0 +1,28 @@
>>>> +#include <module.h>
>>>> +
>>>> +#include "libgcc.h"
>>>> +
>>>> +long long __lshrdi3(long long u, word_type b)
>>>> +{
>>>> +	DWunion uu, w;
>>>> +	word_type bm;
>>>> +
>>>> +	if (b == 0)
>>>> +		return u;
>>>> +
>>>> +	uu.ll = u;
>>>> +	bm = 32 - b;
>>>> +
>>>> +	if (bm <= 0) {
>>>> +		w.s.high = 0;
>>>> +		w.s.low = (unsigned int) uu.s.high >> -bm;
>>>> +	} else {
>>>> +		const unsigned int carries = (unsigned int) uu.s.high << bm;
>>>> +
>>>> +		w.s.high = (unsigned int) uu.s.high >> b;
>>>> +		w.s.low = ((unsigned int) uu.s.low >> b) | carries;
>>>> +	}
>>>> +
>>>> +	return w.ll;
>>>> +}
>>>> +EXPORT_SYMBOL(__lshrdi3);
>>>> diff --git a/arch/riscv/lib/riscv_timer.c b/arch/riscv/lib/riscv_timer.c
>>>> new file mode 100644
>>>> index 000000000..46181f877
>>>> --- /dev/null
>>>> +++ b/arch/riscv/lib/riscv_timer.c
>>>> @@ -0,0 +1,68 @@
>>>> +/*
>>>> + * Copyright (C) 2017 Antony Pavlov <antonynpavlov@gmail.com>
>>>> + *
>>>> + * This file is part of barebox.
>>>> + * See file CREDITS for list of people who contributed to this project.
>>>> + *
>>>> + * This program is free software; you can redistribute it and/or modify
>>>> + * it under the terms of the GNU General Public License version 2
>>>> + * as published by the Free Software Foundation.
>>>> + *
>>>> + * This program is distributed in the hope that it will be useful,
>>>> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
>>>> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
>>>> + * GNU General Public License for more details.
>>>> + *
>>>> + */
>>>> +
>>>> +/**
>>>> + * @file
>>>> + * @brief Clocksource based on RISCV cycle CSR timer
>>>> + */
>>>> +
>>>> +#include <init.h>
>>>> +#include <of.h>
>>>> +#include <linux/clk.h>
>>>> +#include <clock.h>
>>>> +#include <io.h>
>>>> +
>>>> +static uint64_t rdcycle_read(void)
>>>> +{
>>>> +	register unsigned long __v;
>>>> +
>>>> +	__asm__ __volatile__ ("rdcycle %0" : "=r" (__v));
>>>> +
>> Maybe you should also add support for 32-bit cores.
> That do you mean?
>
> rdcycle pseudo op should return 32 low bits of cycle counter on 32-bit core.
>
>
>>>> +	return __v;
>>>> +}
>>>> +
>>>> +static struct clocksource rdcycle_cs = {
>>>> +	.read	= rdcycle_read,
>>>> +	.mask	= CLOCKSOURCE_MASK(32),
>>>> +};
>>>> +
Aah I was a little bit confused by the return value type. You could 
expand the mask to 64 and write something like that:


register unsigned long __v;
register unsigned long __t;
uint64_t time;

#ifdef RISCV_64BIT
     __asm__ __volatile__ ("rdcycle %0" : "=r" (__v));
     return __v;
#else
    do {
         __asm__ __volatile__ ("rdcycle %0" : "=r" (__v));
     } while (__v == 0); //maybe with an additional counter as timeout
     __asm__ __volatile__ ("rdcycleh %0" : "=r" (__t));
     time = (__t << 32) & __v;
     return time;
#endif


I don't know if this works, but we should always support both register 
widths.
BTW: Sometimes your license header are from 2016.

-- 
Mit freundlichen Grüßen,
With best regards,
   Daniel Schultz


_______________________________________________
barebox mailing list
barebox@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/barebox

Re: [RFC v4 01/10] Add initial RISC-V architecture support

[Antony Pavlov]

On Thu, 5 Oct 2017 12:55:09 +0200
Daniel Schultz <d.schultz@phytec.de> wrote:

> Hi,
> 
> On 10/03/2017 12:21 AM, Antony Pavlov wrote:
> > On Mon, 2 Oct 2017 12:08:58 +0200
> > Daniel Schultz <d.schultz@phytec.de> wrote:
> >
> >> Hi,
> >>
> >>
> >> On 09/29/2017 02:07 PM, Oleksij Rempel wrote:
> >>> Hi,
> >>>
> >>> hm... mostly looks identical with existing arch
> >>>
> >>> Am 29.09.2017 um 01:12 schrieb Antony Pavlov:
> >>>> Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
> >>>> --
> >>>> TODOs:
> >>>>
> >>>>     * split patch;
> >>>> ---
> >>>>    arch/riscv/Kconfig                   | 73 +++++++++++++++++++++++++++++
> >>>>    arch/riscv/Makefile                  | 68 +++++++++++++++++++++++++++
> >>>>    arch/riscv/boot/Makefile             |  2 +
> >>>>    arch/riscv/boot/main_entry.c         | 40 ++++++++++++++++
> >>>>    arch/riscv/boot/start.S              | 74 ++++++++++++++++++++++++++++++
> >>>>    arch/riscv/dts/.gitignore            |  >  arch/riscv/dts/Makefile              |  9 ++++
> >>>>    arch/riscv/dts/skeleton.dtsi         | 13 ++++++
> >>>>    arch/riscv/include/asm/barebox.h     |  1 +
> >>>>    arch/riscv/include/asm/bitops.h      | 35 ++++++++++++++
> >>>>    arch/riscv/include/asm/bitsperlong.h | 10 ++++
> >>>>    arch/riscv/include/asm/byteorder.h   | 10 ++++
> >>>>    arch/riscv/include/asm/common.h      |  6 +++
> >>>>    arch/riscv/include/asm/elf.h         | 11 +++++
> >>>>    arch/riscv/include/asm/io.h          |  8 ++++
> >>>>    arch/riscv/include/asm/mmu.h         |  6 +++
> >>>>    arch/riscv/include/asm/posix_types.h |  1 +
> >>>>    arch/riscv/include/asm/sections.h    |  1 +
> >>>>    arch/riscv/include/asm/string.h      |  1 +
> >>>>    arch/riscv/include/asm/swab.h        |  6 +++
> >>>>    arch/riscv/include/asm/types.h       | 60 ++++++++++++++++++++++++
> >>>>    arch/riscv/include/asm/unaligned.h   | 19 ++++++++
> >>>>    arch/riscv/lib/.gitignore            |  1 +
> >>>>    arch/riscv/lib/Makefile              |  9 ++++
> >>>>    arch/riscv/lib/ashldi3.c             | 28 ++++++++++++
> >>>>    arch/riscv/lib/ashrdi3.c             | 30 ++++++++++++
> >>>>    arch/riscv/lib/asm-offsets.c         | 12 +++++
> >>>>    arch/riscv/lib/barebox.lds.S         | 89 ++++++++++++++++++++++++++++++++++++
> >>>>    arch/riscv/lib/dtb.c                 | 41 +++++++++++++++++
> >>>>    arch/riscv/lib/libgcc.h              | 29 ++++++++++++
> >>>>    arch/riscv/lib/lshrdi3.c             | 28 ++++++++++++
> >>>>    arch/riscv/lib/riscv_timer.c         | 68 +++++++++++++++++++++++++++
> >>>>    drivers/of/Kconfig                   |  2 +-
> >>>>    33 files changed, 791 insertions(+), 1 deletion(-)
> >>>>
> >>>> diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
> >>>> new file mode 100644
> >>>> index 000000000..b2f0817ef
> >>>> --- /dev/null
> >>>> +++ b/arch/riscv/Kconfig
> >>>> @@ -0,0 +1,73 @@
> >>>> +config RISCV
> >>>> +	bool
> >>>> +	select GENERIC_FIND_NEXT_BIT
> >>>> +	select HAVE_CONFIGURABLE_MEMORY_LAYOUT
> >>>> +	select HAVE_CONFIGURABLE_TEXT_BASE
> >>>> +	select GPIOLIB
> >>>> +	select OFTREE
> >>>> +	select COMMON_CLK
> >>>> +	select COMMON_CLK_OF_PROVIDER
> >>>> +	select CLKDEV_LOOKUP
> >>>> +	default y
> >>>> +
> >>>> +config ARCH_TEXT_BASE
> >>>> +	hex
> >>>> +	default 0x0
> >>>> +
> >>>> +config GENERIC_LINKER_SCRIPT
> >>>> +	bool
> >>>> +	default y
> >>>> +
> >>>> +menu "Machine selection"
> >>>> +
> >>>> +choice
> >>>> +	prompt "CPU selection"
> >>>> +	default CPU_RV_GENERIC
> >>>> +
> >>>> +config CPU_RV_GENERIC
> >>>> +	bool "Generic RISC-V"
> >>>> +	select CPU_SUPPORTS_32BIT_KERNEL
> >>>> +	select CPU_SUPPORTS_64BIT_KERNEL
> >>>> +
> >>>> +endchoice
> >>>> +
> >>>> +config CPU_SUPPORTS_32BIT_KERNEL
> >>>> +	bool
> >>>> +config CPU_SUPPORTS_64BIT_KERNEL
> >>>> +	bool
> >>>> +
> >>>> +choice
> >>>> +	prompt "barebox code model"
> >>>> +	default 64BIT
> >>>> +
> >>>> +config 32BIT
> >>>> +	bool "32-bit barebox"
> >>>> +	depends on CPU_SUPPORTS_32BIT_KERNEL
> >>>> +	help
> >>>> +	  Select this option to build a 32-bit barebox.
> >>>> +
> >>>> +config 64BIT
> >>>> +	bool "64-bit barebox"
> >>>> +	depends on CPU_SUPPORTS_64BIT_KERNEL
> >>>> +	help
> >>>> +	  Select this option to build a 64-bit barebox.
> >>>> +
> >>>> +endchoice
> >>>> +
> >>>> +config BUILTIN_DTB
> >>>> +	bool "link a DTB into the barebox image"
> >>>> +	depends on OFTREE
> >>>> +
> >>>> +config BUILTIN_DTB_NAME
> >>>> +	string "DTB to build into the barebox image"
> >>>> +	depends on BUILTIN_DTB
> >>>> +
> >>>> +endmenu
> >>>> +
> >>>> +source common/Kconfig
> >>>> +source commands/Kconfig
> >>>> +source net/Kconfig
> >>>> +source drivers/Kconfig
> >>>> +source fs/Kconfig
> >>>> +source lib/Kconfig
> >>>> +source crypto/Kconfig
> >>>> diff --git a/arch/riscv/Makefile b/arch/riscv/Makefile
> >>>> new file mode 100644
> >>>> index 000000000..4e3318cf1
> >>>> --- /dev/null
> >>>> +++ b/arch/riscv/Makefile
> >>>> @@ -0,0 +1,68 @@
> >>>> +CPPFLAGS += -fno-strict-aliasing
> >>>> +
> >>>> +cflags-y += -fno-pic -pipe
> >>>> +cflags-y += -Wall -Wmissing-prototypes -Wstrict-prototypes \
> >>>> +	-Wno-uninitialized -Wno-format -Wno-main -mcmodel=medany
> >>>> +
> >>>> +LDFLAGS += $(ldflags-y)
> >>>> +LDFLAGS_barebox += -nostdlib
> >>>> +
> >>>> +TEXT_BASE = $(CONFIG_TEXT_BASE)
> >>>> +CPPFLAGS += -DTEXT_BASE=$(CONFIG_TEXT_BASE)
> >>>> +
> >>>> +ifndef CONFIG_MODULES
> >>>> +# Add cleanup flags
> >>>> +CPPFLAGS += -fdata-sections -ffunction-sections
> >>>> +LDFLAGS_barebox += -static --gc-sections
> >>>> +endif
> >>>> +
> >>>> +KBUILD_BINARY := barebox.bin
> >>>> +
> >>>> +machdirs := $(patsubst %,arch/riscv/mach-%/,$(machine-y))
> >>>> +
> >>>> +ifneq ($(board-y),)
> >>>> +BOARD := arch/riscv/boards/$(board-y)/
> >>>> +else
> >>>> +BOARD :=
> >>>> +endif
> >>>> +
> >>>> +ifeq ($(KBUILD_SRC),)
> >>>> +CPPFLAGS += -I$(BOARD)/include
> >>>> +else
> >>>> +CPPFLAGS += -I$(srctree)/$(BOARD)/include
> >>>> +endif
> >>>> +
> >>>> +ifeq ($(KBUILD_SRC),)
> >>>> +CPPFLAGS += $(patsubst %,-I%include,$(machdirs))
> >>>> +else
> >>>> +CPPFLAGS += $(patsubst %,-I$(srctree)/%include,$(machdirs))
> >>>> +endif
> >>>> +
> >>>> +archprepare: maketools
> >>>> +
> >>>> +PHONY += maketools
> >>>> +
> >>>> +ifneq ($(machine-y),)
> >>>> +MACH  := arch/riscv/mach-$(machine-y)/
> >>>> +else
> >>>> +MACH  :=
> >>>> +endif
> >>>> +
> >>>> +ifneq ($(board-y),)
> >>>> +BOARD := arch/riscv/boards/$(board-y)/
> >>>> +else
> >>>> +BOARD :=
> >>>> +endif
> >>>> +
> >>>> +common-y += $(BOARD) $(MACH)
> >>>> +common-y += arch/riscv/lib/
> >>>> +common-y += arch/riscv/boot/
> >>>> +
> >>>> +common-$(CONFIG_OFTREE) += arch/riscv/dts/
> >>>> +
> >>>> +CPPFLAGS += $(cflags-y)
> >>>> +CFLAGS += $(cflags-y)
> >>>> +
> >>>> +lds-y	:= arch/riscv/lib/barebox.lds
> >>>> +
> >>>> +CLEAN_FILES += arch/riscv/lib/barebox.lds
> >>>> diff --git a/arch/riscv/boot/Makefile b/arch/riscv/boot/Makefile
> >>>> new file mode 100644
> >>>> index 000000000..d6d28ce65
> >>>> --- /dev/null
> >>>> +++ b/arch/riscv/boot/Makefile
> >>>> @@ -0,0 +1,2 @@
> >>>> +obj-y += start.o
> >>>> +obj-y += main_entry.o
> >>>> diff --git a/arch/riscv/boot/main_entry.c b/arch/riscv/boot/main_entry.c
> >>>> new file mode 100644
> >>>> index 000000000..18db86da5
> >>>> --- /dev/null
> >>>> +++ b/arch/riscv/boot/main_entry.c
> >>>> @@ -0,0 +1,40 @@
> >>>> +/*
> >>>> + * Copyright (C) 2016 Antony Pavlov <antonynpavlov@gmail.com>
> >>>> + *
> >>>> + * This file is part of barebox.
> >>>> + * See file CREDITS for list of people who contributed to this project.
> >>>> + *
> >>>> + * This program is free software; you can redistribute it and/or
> >>>> + * modify it under the terms of the GNU General Public License as
> >>>> + * published by the Free Software Foundation; either version 2 of
> >>>> + * the License, or (at your option) any later version.
> >>>> + *
> >>>> + * This program is distributed in the hope that it will be useful,
> >>>> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> >>>> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> >>>> + * GNU General Public License for more details.
> >>>> + *
> >>>> + */
> >>>> +
> >>>> +#include <common.h>
> >>>> +#include <memory.h>
> >>>> +#include <asm-generic/memory_layout.h>
> >>>> +#include <asm/sections.h>
> >>>> +
> >>>> +void main_entry(void);
> >>>> +
> >>>> +/**
> >>>> + * Called plainly from assembler code
> >>>> + *
> >>>> + * @note The C environment isn't initialized yet
> >>>> + */
> >>>> +void main_entry(void)
> >>>> +{
> >>>> +	/* clear the BSS first */
> >>>> +	memset(__bss_start, 0x00, __bss_stop - __bss_start);
> >>>> +
> >>>> +	mem_malloc_init((void *)MALLOC_BASE,
> >>>> +			(void *)(MALLOC_BASE + MALLOC_SIZE - 1));
> >>>> +
> >>>> +	start_barebox();
> >>>> +}
> >>>> diff --git a/arch/riscv/boot/start.S b/arch/riscv/boot/start.S
> >>>> new file mode 100644
> >>>> index 000000000..2fd00f63d
> >>>> --- /dev/null
> >>>> +++ b/arch/riscv/boot/start.S
> >>>> @@ -0,0 +1,74 @@
> >>>> +/*
> >>>> + * Startup Code for MIPS CPU
> >>>> + *
> >>>> + * based on coreboot/src/arch/riscv/bootblock.S
> >>>> + *
> >>>> + * Copyright (C) 2016 Antony Pavlov <antonynpavlov@gmail.com>
> >>>> + *
> >>>> + * This file is part of barebox.
> >>>> + * See file CREDITS for list of people who contributed to this project.
> >>>> + *
> >>>> + * This program is free software; you can redistribute it and/or modify
> >>>> + * it under the terms of the GNU General Public License version 2
> >>>> + * as published by the Free Software Foundation.
> >>>> + *
> >>>> + * This program is distributed in the hope that it will be useful,
> >>>> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> >>>> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> >>>> + * GNU General Public License for more details.
> >>>> + *
> >>>> + */
> >>>> +
> >>>> +#include <asm-generic/memory_layout.h>
> >>>> +
> >>>> +	.text
> >>>> +	.section ".text_entry"
> >>>> +	.align 2
> >>>> +
> >>>> +.globl _start
> >>>> +_start:
> >>>> +	li sp, STACK_BASE + STACK_SIZE
> >>>> +
> >>>> +	# make room for HLS and initialize it
> >>>> +	addi sp, sp, -64 /* MENTRY_FRAME_SIZE */
> >>>> +
> >>>> +	# poison the stack
> >>>> +	li t1, STACK_BASE
> >>>> +	li t0, 0xdeadbeef
> >>>> +	sw t0, 0(t1)
> >>>> +
> >>>> +	# clear any pending interrupts
> >>>> +	//csrwi mip, 0
> >>> should be removed.
> >>>
> >>>> +	/* copy barebox to link location */
> >>>> +
> >>>> +	la	a0, _start	/* a0 <- _start actual address */
> >>>> +	li	a1, CONFIG_TEXT_BASE	/* a1 <- _start link address */
> >>>> +
> >>>> +	beq	a0, a1, main_entry
> >>>> +
> >>>> +	la	a2, __bss_start
> >>>> +
> >>>> +#define LONGSIZE 4
> >>>> +
> >>>> +copy_loop:
> >>>> +	/* copy from source address [a0] */
> >>>> +	lw	t0, LONGSIZE * 0(a0)
> >>>> +	lw	t1, LONGSIZE * 1(a0)
> >>>> +	lw	t2, LONGSIZE * 2(a0)
> >>>> +	lw	t3, LONGSIZE * 3(a0)
> >>>> +	/* copy to target address [a1] */
> >>>> +	sw	t0, LONGSIZE * 0(a1)
> >>>> +	sw	t1, LONGSIZE * 1(a1)
> >>>> +	sw	t2, LONGSIZE * 2(a1)
> >>>> +	sw	t3, LONGSIZE * 3(a1)
> >>>> +	addi	a0, a0, LONGSIZE * 2
> >>>> +	addi	a1, a1, LONGSIZE * 2
> >>>> +	bgeu	a2, a0, copy_loop
> >>>> +
> >>>> +	/* Alas! At the moment I can't load main_entry __link__ address
> >>>> +	   into a0 with la. Use CONFIG_TEXT_BASE instead. This solution
> >>>> +	   leads to extra cycles for repeat sp initialization. */
> >>>> +
> >>>> +	li	a0, CONFIG_TEXT_BASE
> >>>> +	jalr	a0
> >>>> diff --git a/arch/riscv/dts/.gitignore b/arch/riscv/dts/.gitignore
> >>>> new file mode 100644
> >>>> index 000000000..077903c50
> >>>> --- /dev/null
> >>>> +++ b/arch/riscv/dts/.gitignore
> >>>> @@ -0,0 +1 @@
> >>>> +*dtb*
> >>>> diff --git a/arch/riscv/dts/Makefile b/arch/riscv/dts/Makefile
> >>>> new file mode 100644
> >>>> index 000000000..f8380b11c
> >>>> --- /dev/null
> >>>> +++ b/arch/riscv/dts/Makefile
> >>>> @@ -0,0 +1,9 @@
> >>>> +BUILTIN_DTB := $(patsubst "%",%,$(CONFIG_BUILTIN_DTB_NAME))
> >>>> +obj-$(CONFIG_BUILTIN_DTB) += $(BUILTIN_DTB).dtb.o
> >>>> +
> >>>> +# just to build a built-in.o. Otherwise compilation fails when no devicetree is
> >>>> +# created.
> >>>> +obj- += dummy.o
> >>>> +
> >>>> +always := $(dtb-y)
> >>>> +clean-files := *.dtb *.dtb.S .*.dtc .*.pre .*.dts
> >>>> diff --git a/arch/riscv/dts/skeleton.dtsi b/arch/riscv/dts/skeleton.dtsi
> >>>> new file mode 100644
> >>>> index 000000000..38ead821b
> >>>> --- /dev/null
> >>>> +++ b/arch/riscv/dts/skeleton.dtsi
> >>>> @@ -0,0 +1,13 @@
> >>>> +/*
> >>>> + * Skeleton device tree; the bare minimum needed to boot; just include and
> >>>> + * add a compatible value.  The bootloader will typically populate the memory
> >>>> + * node.
> >>>> + */
> >>>> +
> >>>> +/ {
> >>>> +	#address-cells = <2>;
> >>>> +	#size-cells = <1>;
> >>>> +	chosen { };
> >>>> +	aliases { };
> >>>> +	memory { device_type = "memory"; reg = <0 0 0>; };
> >>> "reg = <0 0>" instead?
> >>>
> >>>> +};
> >>>> diff --git a/arch/riscv/include/asm/barebox.h b/arch/riscv/include/asm/barebox.h
> >>>> new file mode 100644
> >>>> index 000000000..2997587d8
> >>>> --- /dev/null
> >>>> +++ b/arch/riscv/include/asm/barebox.h
> >>>> @@ -0,0 +1 @@
> >>>> +/* dummy */
> >>>> diff --git a/arch/riscv/include/asm/bitops.h b/arch/riscv/include/asm/bitops.h
> >>>> new file mode 100644
> >>>> index 000000000..e77ab8320
> >>>> --- /dev/null
> >>>> +++ b/arch/riscv/include/asm/bitops.h
> >>>> @@ -0,0 +1,35 @@
> >>>> +/*
> >>>> + * This program is free software; you can redistribute it and/or
> >>>> + * modify it under the terms of the GNU General Public License as
> >>>> + * published by the Free Software Foundation; either version 2 of
> >>>> + * the License, or (at your option) any later version.
> >>>> + *
> >>>> + * This program is distributed in the hope that it will be useful,
> >>>> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> >>>> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> >>>> + * GNU General Public License for more details.
> >>>> + *
> >>>> + *
> >>>> + */
> >>>> +
> >>>> +#ifndef _ASM_BITOPS_H_
> >>>> +#define _ASM_BITOPS_H_
> >>>> +
> >>>> +#include <asm-generic/bitops/__ffs.h>
> >>>> +#include <asm-generic/bitops/__fls.h>
> >>>> +#include <asm-generic/bitops/ffs.h>
> >>>> +#include <asm-generic/bitops/fls.h>
> >>>> +#include <asm-generic/bitops/ffz.h>
> >>>> +#include <asm-generic/bitops/hweight.h>
> >>>> +#include <asm-generic/bitops/fls64.h>
> >>>> +#include <asm-generic/bitops/find.h>
> >>>> +#include <asm-generic/bitops/ops.h>
> >>>> +
> >>>> +#define set_bit(x, y)			__set_bit(x, y)
> >>>> +#define clear_bit(x, y)			__clear_bit(x, y)
> >>>> +#define change_bit(x, y)		__change_bit(x, y)
> >>>> +#define test_and_set_bit(x, y)		__test_and_set_bit(x, y)
> >>>> +#define test_and_clear_bit(x, y)	__test_and_clear_bit(x, y)
> >>>> +#define test_and_change_bit(x, y)	__test_and_change_bit(x, y)
> >>>> +
> >>>> +#endif /* _ASM_BITOPS_H_ */
> >>>> diff --git a/arch/riscv/include/asm/bitsperlong.h b/arch/riscv/include/asm/bitsperlong.h
> >>>> new file mode 100644
> >>>> index 000000000..4641e7e48
> >>>> --- /dev/null
> >>>> +++ b/arch/riscv/include/asm/bitsperlong.h
> >>>> @@ -0,0 +1,10 @@
> >>>> +#ifndef __ASM_BITSPERLONG_H
> >>>> +#define __ASM_BITSPERLONG_H
> >>>> +
> >>>> +#ifdef __riscv64
> >>>> +#define BITS_PER_LONG 64
> >>>> +#else
> >>>> +#define BITS_PER_LONG 32
> >>>> +#endif
> >>>> +
> >>>> +#endif /* __ASM_BITSPERLONG_H */
> >>>> diff --git a/arch/riscv/include/asm/byteorder.h b/arch/riscv/include/asm/byteorder.h
> >>>> new file mode 100644
> >>>> index 000000000..778bb7224
> >>>> --- /dev/null
> >>>> +++ b/arch/riscv/include/asm/byteorder.h
> >>>> @@ -0,0 +1,10 @@
> >>>> +#ifndef _ASM_RISCV_BYTEORDER_H
> >>>> +#define _ASM_RISCV_BYTEORDER_H
> >>>> +
> >>>> +#if defined(__RISCVEB__)
> >>>> +#include <linux/byteorder/big_endian.h>
> >>>> +#else
> >>>> +#include <linux/byteorder/little_endian.h>
> >>>> +#endif
> >>>> +
> >>>> +#endif /* _ASM_RISCV_BYTEORDER_H */
> >>>> diff --git a/arch/riscv/include/asm/common.h b/arch/riscv/include/asm/common.h
> >>>> new file mode 100644
> >>>> index 000000000..bc8a17e30
> >>>> --- /dev/null
> >>>> +++ b/arch/riscv/include/asm/common.h
> >>>> @@ -0,0 +1,6 @@
> >>>> +#ifndef ASM_RISCV_COMMON_H
> >>>> +#define ASM_RISCV_COMMON_H
> >>>> +
> >>>> +/* nothing special yet */
> >>>> +
> >>>> +#endif /* ASM_RISCV_COMMON_H */
> >>>> diff --git a/arch/riscv/include/asm/elf.h b/arch/riscv/include/asm/elf.h
> >>>> new file mode 100644
> >>>> index 000000000..7134fa058
> >>>> --- /dev/null
> >>>> +++ b/arch/riscv/include/asm/elf.h
> >>>> @@ -0,0 +1,11 @@
> >>>> +#ifndef __ASM_RISCV_ELF_H__
> >>>> +#define __ASM_RISCV_ELF_H__
> >>>> +
> >>>> +#if __SIZEOF_POINTER__ == 8
> >>>> +#define ELF_CLASS	ELFCLASS64
> >>>> +#define CONFIG_PHYS_ADDR_T_64BIT
> >>>> +#else
> >>>> +#define ELF_CLASS	ELFCLASS32
> >>>> +#endif
> >>>> +
> >>>> +#endif /* __ASM_RISCV_ELF_H__ */
> >>>> diff --git a/arch/riscv/include/asm/io.h b/arch/riscv/include/asm/io.h
> >>>> new file mode 100644
> >>>> index 000000000..3cdea7fca
> >>>> --- /dev/null
> >>>> +++ b/arch/riscv/include/asm/io.h
> >>>> @@ -0,0 +1,8 @@
> >>>> +#ifndef __ASM_RISCV_IO_H
> >>>> +#define __ASM_RISCV_IO_H
> >>>> +
> >>>> +#define IO_SPACE_LIMIT 0
> >>>> +
> >>>> +#include <asm-generic/io.h>
> >>>> +
> >>>> +#endif /* __ASM_RISCV_IO_H */
> >>>> diff --git a/arch/riscv/include/asm/mmu.h b/arch/riscv/include/asm/mmu.h
> >>>> new file mode 100644
> >>>> index 000000000..95af87142
> >>>> --- /dev/null
> >>>> +++ b/arch/riscv/include/asm/mmu.h
> >>>> @@ -0,0 +1,6 @@
> >>>> +#ifndef __ASM_MMU_H
> >>>> +#define __ASM_MMU_H
> >>>> +
> >>>> +#define MAP_ARCH_DEFAULT MAP_UNCACHED
> >>>> +
> >>>> +#endif /* __ASM_MMU_H */
> >>>> diff --git a/arch/riscv/include/asm/posix_types.h b/arch/riscv/include/asm/posix_types.h
> >>>> new file mode 100644
> >>>> index 000000000..22cae6230
> >>>> --- /dev/null
> >>>> +++ b/arch/riscv/include/asm/posix_types.h
> >>>> @@ -0,0 +1 @@
> >>>> +#include <asm-generic/posix_types.h>
> >>>> diff --git a/arch/riscv/include/asm/sections.h b/arch/riscv/include/asm/sections.h
> >>>> new file mode 100644
> >>>> index 000000000..2b8c51603
> >>>> --- /dev/null
> >>>> +++ b/arch/riscv/include/asm/sections.h
> >>>> @@ -0,0 +1 @@
> >>>> +#include <asm-generic/sections.h>
> >>>> diff --git a/arch/riscv/include/asm/string.h b/arch/riscv/include/asm/string.h
> >>>> new file mode 100644
> >>>> index 000000000..2997587d8
> >>>> --- /dev/null
> >>>> +++ b/arch/riscv/include/asm/string.h
> >>>> @@ -0,0 +1 @@
> >>>> +/* dummy */
> >>>> diff --git a/arch/riscv/include/asm/swab.h b/arch/riscv/include/asm/swab.h
> >>>> new file mode 100644
> >>>> index 000000000..60a90120b
> >>>> --- /dev/null
> >>>> +++ b/arch/riscv/include/asm/swab.h
> >>>> @@ -0,0 +1,6 @@
> >>>> +#ifndef _ASM_SWAB_H
> >>>> +#define _ASM_SWAB_H
> >>>> +
> >>>> +/* nothing. use generic functions */
> >>>> +
> >>>> +#endif /* _ASM_SWAB_H */
> >>>> diff --git a/arch/riscv/include/asm/types.h b/arch/riscv/include/asm/types.h
> >>>> new file mode 100644
> >>>> index 000000000..ba386ab4c
> >>>> --- /dev/null
> >>>> +++ b/arch/riscv/include/asm/types.h
> >>>> @@ -0,0 +1,60 @@
> >>>> +#ifndef __ASM_RISCV_TYPES_H
> >>>> +#define __ASM_RISCV_TYPES_H
> >>>> +
> >>>> +#ifdef __riscv64
> >>>> +/*
> >>>> + * This is used in dlmalloc. On RISCV64 we need it to be 64 bit
> >>>> + */
> >>>> +#define INTERNAL_SIZE_T unsigned long
> >>>> +
> >>>> +/*
> >>>> + * This is a Kconfig variable in the Kernel, but we want to detect
> >>>> + * this during compile time, so we set it here.
> >>>> + */
> >>>> +#define CONFIG_PHYS_ADDR_T_64BIT
> >>>> +
> >>>> +#endif
> >>>> +
> >>>> +typedef unsigned short umode_t;
> >>>> +
> >>>> +/*
> >>>> + * __xx is ok: it doesn't pollute the POSIX namespace. Use these in the
> >>>> + * header files exported to user space
> >>>> + */
> >>>> +
> >>>> +typedef __signed__ char __s8;
> >>>> +typedef unsigned char __u8;
> >>>> +
> >>>> +typedef __signed__ short __s16;
> >>>> +typedef unsigned short __u16;
> >>>> +
> >>>> +typedef __signed__ int __s32;
> >>>> +typedef unsigned int __u32;
> >>>> +
> >>>> +#if defined(__GNUC__) && !defined(__STRICT_ANSI__)
> >>>> +typedef __signed__ long long __s64;
> >>>> +typedef unsigned long long __u64;
> >>>> +#endif
> >>>> +
> >>>> +/*
> >>>> + * These aren't exported outside the kernel to avoid name space clashes
> >>>> + */
> >>>> +#ifdef __KERNEL__
> >>>> +
> >>>> +typedef signed char s8;
> >>>> +typedef unsigned char u8;
> >>>> +
> >>>> +typedef signed short s16;
> >>>> +typedef unsigned short u16;
> >>>> +
> >>>> +typedef signed int s32;
> >>>> +typedef unsigned int u32;
> >>>> +
> >>>> +typedef signed long long s64;
> >>>> +typedef unsigned long long u64;
> >>>> +
> >>>> +#include <asm/bitsperlong.h>
> >>>> +
> >>>> +#endif /* __KERNEL__ */
> >>>> +
> >>>> +#endif /* __ASM_RISCV_TYPES_H */
> >>>> diff --git a/arch/riscv/include/asm/unaligned.h b/arch/riscv/include/asm/unaligned.h
> >>>> new file mode 100644
> >>>> index 000000000..aaebc0641
> >>>> --- /dev/null
> >>>> +++ b/arch/riscv/include/asm/unaligned.h
> >>>> @@ -0,0 +1,19 @@
> >>>> +#ifndef _ASM_RISCV_UNALIGNED_H
> >>>> +#define _ASM_RISCV_UNALIGNED_H
> >>>> +
> >>>> +/*
> >>>> + * FIXME: this file is copy-n-pasted from sandbox's unaligned.h
> >>>> + */
> >>>> +
> >>>> +#include <linux/unaligned/access_ok.h>
> >>>> +#include <linux/unaligned/generic.h>
> >>>> +
> >>>> +#if __BYTE_ORDER == __LITTLE_ENDIAN
> >>>> +#define get_unaligned __get_unaligned_le
> >>>> +#define put_unaligned __put_unaligned_le
> >>>> +#else
> >>>> +#define get_unaligned __get_unaligned_be
> >>>> +#define put_unaligned __put_unaligned_be
> >>>> +#endif
> >>>> +
> >>>> +#endif /* _ASM_RISCV_UNALIGNED_H */
> >>>> diff --git a/arch/riscv/lib/.gitignore b/arch/riscv/lib/.gitignore
> >>>> new file mode 100644
> >>>> index 000000000..d1165788c
> >>>> --- /dev/null
> >>>> +++ b/arch/riscv/lib/.gitignore
> >>>> @@ -0,0 +1 @@
> >>>> +barebox.lds
> >>>> diff --git a/arch/riscv/lib/Makefile b/arch/riscv/lib/Makefile
> >>>> new file mode 100644
> >>>> index 000000000..313363c1a
> >>>> --- /dev/null
> >>>> +++ b/arch/riscv/lib/Makefile
> >>>> @@ -0,0 +1,9 @@
> >>>> +extra-$(CONFIG_GENERIC_LINKER_SCRIPT) += barebox.lds
> >>>> +
> >>>> +obj-y += riscv_timer.o
> >>>> +
> >>>> +obj-$(CONFIG_32BIT) += lshrdi3.o
> >>>> +obj-$(CONFIG_32BIT) += ashldi3.o
> >>>> +obj-$(CONFIG_32BIT) += ashrdi3.o
> >>>> +
> >>>> +obj-$(CONFIG_BUILTIN_DTB) += dtb.o
> >>>> diff --git a/arch/riscv/lib/ashldi3.c b/arch/riscv/lib/ashldi3.c
> >>>> new file mode 100644
> >>>> index 000000000..cbdbcbb6a
> >>>> --- /dev/null
> >>>> +++ b/arch/riscv/lib/ashldi3.c
> >>>> @@ -0,0 +1,28 @@
> >>>> +#include <module.h>
> >>>> +
> >>>> +#include "libgcc.h"
> >>>> +
> >>>> +long long __ashldi3(long long u, word_type b)
> >>>> +{
> >>>> +	DWunion uu, w;
> >>>> +	word_type bm;
> >>>> +
> >>>> +	if (b == 0)
> >>>> +		return u;
> >>>> +
> >>>> +	uu.ll = u;
> >>>> +	bm = 32 - b;
> >>>> +
> >>>> +	if (bm <= 0) {
> >>>> +		w.s.low = 0;
> >>>> +		w.s.high = (unsigned int) uu.s.low << -bm;
> >>>> +	} else {
> >>>> +		const unsigned int carries = (unsigned int) uu.s.low >> bm;
> >>>> +
> >>>> +		w.s.low = (unsigned int) uu.s.low << b;
> >>>> +		w.s.high = ((unsigned int) uu.s.high << b) | carries;
> >>>> +	}
> >>>> +
> >>>> +	return w.ll;
> >>>> +}
> >>>> +EXPORT_SYMBOL(__ashldi3);
> >>>> diff --git a/arch/riscv/lib/ashrdi3.c b/arch/riscv/lib/ashrdi3.c
> >>>> new file mode 100644
> >>>> index 000000000..928d6d97c
> >>>> --- /dev/null
> >>>> +++ b/arch/riscv/lib/ashrdi3.c
> >>>> @@ -0,0 +1,30 @@
> >>>> +#include <module.h>
> >>>> +
> >>>> +#include "libgcc.h"
> >>>> +
> >>>> +long long __ashrdi3(long long u, word_type b)
> >>>> +{
> >>>> +	DWunion uu, w> +	word_type bm;
> >>>> +
> >>>> +	if (b == 0)
> >>>> +		return u;
> >>>> +
> >>>> +	uu.ll = u;
> >>>> +	bm = 32 - b;
> >>>> +
> >>>> +	if (bm <= 0) {
> >>>> +		/* w.s.high = 1..1 or 0..0 */
> >>>> +		w.s.high =
> >>>> +		    uu.s.high >> 31;
> >>>> +		w.s.low = uu.s.high >> -bm;
> >>>> +	} else {
> >>>> +		const unsigned int carries = (unsigned int) uu.s.high << bm;
> >>>> +
> >>>> +		w.s.high = uu.s.high >> b;
> >>>> +		w.s.low = ((unsigned int) uu.s.low >> b) | carries;
> >>>> +	}
> >>>> +
> >>>> +	return w.ll;
> >>>> +}
> >>>> +EXPORT_SYMBOL(__ashrdi3);
> >>>> diff --git a/arch/riscv/lib/asm-offsets.c b/arch/riscv/lib/asm-offsets.c
> >>>> new file mode 100644
> >>>> index 000000000..22f382b71
> >>>> --- /dev/null
> >>>> +++ b/arch/riscv/lib/asm-offsets.c
> >>>> @@ -0,0 +1,12 @@
> >>>> +/*
> >>>> + * Generate definitions needed by assembly language modules.
> >>>> + * This code generates raw asm output which is post-processed to extract
> >>>> + * and format the required data.
> >>>> + */
> >>>> +
> >>>> +#include <linux/kbuild.h>
> >>>> +
> >>>> +int main(void)
> >>>> +{
> >>>> +	return 0;
> >>>> +}
> >>>> diff --git a/arch/riscv/lib/barebox.lds.S b/arch/riscv/lib/barebox.lds.S
> >>>> new file mode 100644
> >>>> index 000000000..9468fb8b5
> >>>> --- /dev/null
> >>>> +++ b/arch/riscv/lib/barebox.lds.S
> >>>> @@ -0,0 +1,89 @@
> >>>> +/*
> >>>> + * Copyright (C) 2016 Antony Pavlov <antonynpavlov@gmail.com>
> >>>> + *
> >>>> + * This file is part of barebox.
> >>>> + * See file CREDITS for list of people who contributed to this project.
> >>>> + *
> >>>> + * This program is free software; you can redistribute it and/or modify
> >>>> + * it under the terms of the GNU General Public License version 2
> >>>> + * as published by the Free Software Foundation.
> >>>> + *
> >>>> + * This program is distributed in the hope that it will be useful,
> >>>> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> >>>> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> >>>> + * GNU General Public License for more details.
> >>>> + *
> >>>> + */
> >>>> +
> >>>> +#include <asm-generic/barebox.lds.h>
> >>>> +
> >>>> +OUTPUT_ARCH(riscv)
> >>>> +ENTRY(_start)
> >>>> +SECTIONS
> >>>> +{
> >>>> +	. = TEXT_BASE;
> >>>> +
> >>>> +	. = ALIGN(8);
> >>>> +	.text      :
> >>>> +	{
> >>>> +		_stext = .;
> >>>> +		_start = .;
> >>>> +		KEEP(*(.text_entry*))
> >>>> +		_text = .;
> >>>> +		__bare_init_start = .;
> >>>> +		*(.text_bare_init*)
> >>>> +		__bare_init_end = .;
> >>>> +		*(.text*)
> >>>> +	}
> >>>> +	BAREBOX_BARE_INIT_SIZE
> >>>> +
> >>>> +	PRE_IMAGE
> >>>> +
> >>>> +	. = ALIGN(8);
> >>>> +	.rodata : { *(.rodata*) }
> >>>> +
> >>>> +	_etext = .;			/* End of text and rodata section */
> >>>> +	_sdata = .;
> >>>> +
> >>>> +	. = ALIGN(8);
> >>>> +	.data : { *(.data*) }
> >>>> +
> >>>> +	.barebox_imd : { BAREBOX_IMD }
> >>>> +
> >>>> +	. = ALIGN(8);
> >>>> +	.got : { *(.got*) }
> >>>> +
> >>>> +	. = .;
> >>>> +	__barebox_cmd_start = .;
> >>>> +	.barebox_cmd : { BAREBOX_CMDS }
> >>>> +	__barebox_cmd_end = .;
> >>>> +
> >>>> +	__barebox_magicvar_start = .;
> >>>> +	.barebox_magicvar : { BAREBOX_MAGICVARS }
> >>>> +	__barebox_magicvar_end = .;
> >>>> +
> >>>> +	__barebox_initcalls_start = .;
> >>>> +	.barebox_initcalls : { INITCALLS }
> >>>> +	__barebox_initcalls_end = .;
> >>>> +
> >>>> +	__barebox_exitcalls_start = .;
> >>>> +	.barebox_exitcalls : { EXITCALLS }
> >>>> +	__barebox_exitcalls_end = .;
> >>>> +
> >>>> +	__usymtab_start = .;
> >>>> +	__usymtab : { BAREBOX_SYMS }
> >>>> +	__usymtab_end = .;
> >>>> +
> >>>> +	.rela.dyn : { *(.rela*) }
> >>>> +
> >>>> +	.oftables : { BAREBOX_CLK_TABLE() }
> >>>> +
> >>>> +	.dtb : { BAREBOX_DTB() }
> >>>> +
> >>>> +	_edata = .;
> >>>> +	. = ALIGN(8);
> >>>> +	__bss_start = .;
> >>>> +	.bss : { *(.bss*) *(.sbss*) }
> >>>> +	__bss_stop = .;
> >>>> +	_end = .;
> >>>> +}
> >>>> diff --git a/arch/riscv/lib/dtb.c b/arch/riscv/lib/dtb.c
> >>>> new file mode 100644
> >>>> index 000000000..09f519dcc
> >>>> --- /dev/null
> >>>> +++ b/arch/riscv/lib/dtb.c
> >>>> @@ -0,0 +1,41 @@
> >>>> +/*
> >>>> + * Copyright (C) 2016 Antony Pavlov <antonynpavlov@gmail.com>
> >>>> + *
> >>>> + * See file CREDITS for list of people who contributed to this
> >>>> + * project.
> >>>> + *
> >>>> + * This program is free software; you can redistribute it and/or modify
> >>>> + * it under the terms of the GNU General Public License version 2
> >>>> + * as published by the Free Software Foundation.
> >>>> + *
> >>>> + * This program is distributed in the hope that it will be useful,
> >>>> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> >>>> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> >>>> + * GNU General Public License for more details.
> >>>> + *
> >>>> + */
> >>>> +#include <common.h>
> >>>> +#include <init.h>
> >>>> +#include <of.h>
> >>>> +
> >>>> +extern char __dtb_start[];
> >>>> +
> >>>> +static int of_riscv_init(void)
> >>>> +{
> >>>> +	struct device_node *root;
> >>>> +
> >>>> +	root = of_get_root_node();
> >>>> +	if (root)
> >>>> +		return 0;
> >>>> +
> >>>> +	root = of_unflatten_dtb(__dtb_start);
> >>>> +	if (!IS_ERR(root)) {
> >>>> +		pr_debug("using internal DTB\n");
> >>>> +		of_set_root_node(root);
> >>>> +		if (IS_ENABLED(CONFIG_OFDEVICE))
> >>>> +			of_probe();
> >>>> +	}
> >>>> +
> >>>> +	return 0;
> >>>> +}
> >>>> +core_initcall(of_riscv_init);
> >>>> diff --git a/arch/riscv/lib/libgcc.h b/arch/riscv/lib/libgcc.h
> >>>> new file mode 100644
> >>>> index 000000000..593e59802
> >>>> --- /dev/null
> >>>> +++ b/arch/riscv/lib/libgcc.h
> >>>> @@ -0,0 +1,29 @@
> >>>> +#ifndef __ASM_LIBGCC_H
> >>>> +#define __ASM_LIBGCC_H
> >>>> +
> >>>> +#include <asm/byteorder.h>
> >>>> +
> >>>> +typedef int word_type __attribute__ ((mode (__word__)));
> >>>> +#ifdef __BIG_ENDIAN
> >>>> +struct DWstruct {
> >>>> +	int high, low;
> >>>> +};
> >>>> +#elif defined(__LITTLE_ENDIAN)
> >>>> +struct DWstruct {
> >>>> +	int low, high;
> >>>> +};
> >>>> +#else
> >>>> +#error I feel sick.
> >>>> +#endif
> >>>> +
> >>>> +typedef union {
> >>>> +	struct DWstruct s;
> >>>> +	long long ll;
> >>>> +} DWunion;
> >>>> +
> >>>> +long long __lshrdi3(long long u, word_type b);
> >>>> +long long __ashldi3(long long u, word_type b);
> >>>> +long long __ashrdi3(long long u, word_type b);
> >>>> +
> >>>> +#endif /* __ASM_LIBGCC_H */
> >>>> diff --git a/arch/riscv/lib/lshrdi3.c b/arch/riscv/lib/lshrdi3.c
> >>>> new file mode 100644
> >>>> index 000000000..74a4846e9
> >>>> --- /dev/null
> >>>> +++ b/arch/riscv/lib/lshrdi3.c
> >>>> @@ -0,0 +1,28 @@
> >>>> +#include <module.h>
> >>>> +
> >>>> +#include "libgcc.h"
> >>>> +
> >>>> +long long __lshrdi3(long long u, word_type b)
> >>>> +{
> >>>> +	DWunion uu, w;
> >>>> +	word_type bm;
> >>>> +
> >>>> +	if (b == 0)
> >>>> +		return u;
> >>>> +
> >>>> +	uu.ll = u;
> >>>> +	bm = 32 - b;
> >>>> +
> >>>> +	if (bm <= 0) {
> >>>> +		w.s.high = 0;
> >>>> +		w.s.low = (unsigned int) uu.s.high >> -bm;
> >>>> +	} else {
> >>>> +		const unsigned int carries = (unsigned int) uu.s.high << bm;
> >>>> +
> >>>> +		w.s.high = (unsigned int) uu.s.high >> b;
> >>>> +		w.s.low = ((unsigned int) uu.s.low >> b) | carries;
> >>>> +	}
> >>>> +
> >>>> +	return w.ll;
> >>>> +}
> >>>> +EXPORT_SYMBOL(__lshrdi3);
> >>>> diff --git a/arch/riscv/lib/riscv_timer.c b/arch/riscv/lib/riscv_timer.c
> >>>> new file mode 100644
> >>>> index 000000000..46181f877
> >>>> --- /dev/null
> >>>> +++ b/arch/riscv/lib/riscv_timer.c
> >>>> @@ -0,0 +1,68 @@
> >>>> +/*
> >>>> + * Copyright (C) 2017 Antony Pavlov <antonynpavlov@gmail.com>
> >>>> + *
> >>>> + * This file is part of barebox.
> >>>> + * See file CREDITS for list of people who contributed to this project.
> >>>> + *
> >>>> + * This program is free software; you can redistribute it and/or modify
> >>>> + * it under the terms of the GNU General Public License version 2
> >>>> + * as published by the Free Software Foundation.
> >>>> + *
> >>>> + * This program is distributed in the hope that it will be useful,
> >>>> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> >>>> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> >>>> + * GNU General Public License for more details.
> >>>> + *
> >>>> + */
> >>>> +
> >>>> +/**
> >>>> + * @file
> >>>> + * @brief Clocksource based on RISCV cycle CSR timer
> >>>> + */
> >>>> +
> >>>> +#include <init.h>
> >>>> +#include <of.h>
> >>>> +#include <linux/clk.h>
> >>>> +#include <clock.h>
> >>>> +#include <io.h>
> >>>> +
> >>>> +static uint64_t rdcycle_read(void)
> >>>> +{
> >>>> +	register unsigned long __v;
> >>>> +
> >>>> +	__asm__ __volatile__ ("rdcycle %0" : "=r" (__v));
> >>>> +
> >> Maybe you should also add support for 32-bit cores.
> > That do you mean?
> >
> > rdcycle pseudo op should return 32 low bits of cycle counter on 32-bit core.
> >
> >
> >>>> +	return __v;
> >>>> +}
> >>>> +
> >>>> +static struct clocksource rdcycle_cs = {
> >>>> +	.read	= rdcycle_read,
> >>>> +	.mask	= CLOCKSOURCE_MASK(32),
> >>>> +};
> >>>> +
> Aah I was a little bit confused by the return value type. You could 
> expand the mask to 64 and write something like that:
> 
> 
> register unsigned long __v;
> register unsigned long __t;
> uint64_t time;
> 
> #ifdef RISCV_64BIT
>      __asm__ __volatile__ ("rdcycle %0" : "=r" (__v));
>      return __v;
> #else
>     do {
>          __asm__ __volatile__ ("rdcycle %0" : "=r" (__v));
>      } while (__v == 0); //maybe with an additional counter as timeout
>      __asm__ __volatile__ ("rdcycleh %0" : "=r" (__t));
>      time = (__t << 32) & __v;
>      return time;
> #endif
> 
> 
> I don't know if this works, but we should always support both register 
> widths.
>
> BTW: Sometimes your license header are from 2016.

RISC-V RFC patchseries v1 was proposed in 2016, see
http://lists.infradead.org/pipermail/barebox/2016-October/028309.html

I have not introduced sizeble changes in this files in 2017.

-- 
Best regards,
  Antony Pavlov

_______________________________________________
barebox mailing list
barebox@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/barebox

[RFC v4 02/10] RISC-V: add Erizo SoC support

[Antony Pavlov]

Erizo is an opensource hardware SoC for FPGA.

Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
---
 arch/riscv/Kconfig                         | 11 +++++++
 arch/riscv/Makefile                        |  3 ++
 arch/riscv/boards/erizo-generic/.gitignore |  1 +
 arch/riscv/boards/erizo-generic/Makefile   |  1 +
 arch/riscv/boards/erizo-generic/board.c    | 28 ++++++++++++++++++
 arch/riscv/dts/erizo.dtsi                  | 46 ++++++++++++++++++++++++++++++
 arch/riscv/dts/erizo_generic.dts           | 31 ++++++++++++++++++++
 arch/riscv/mach-erizo/Kconfig              | 11 +++++++
 arch/riscv/mach-erizo/Makefile             |  3 ++
 9 files changed, 135 insertions(+)

diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index b2f0817ef..f4bfbea7c 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -20,6 +20,15 @@ config GENERIC_LINKER_SCRIPT
 
 menu "Machine selection"
 
+choice
+	prompt "System type"
+	default MACH_ERIZO
+
+config MACH_ERIZO
+	bool "erizo family"
+
+endchoice
+
 choice
 	prompt "CPU selection"
 	default CPU_RV_GENERIC
@@ -62,6 +71,8 @@ config BUILTIN_DTB_NAME
 	string "DTB to build into the barebox image"
 	depends on BUILTIN_DTB
 
+source arch/riscv/mach-erizo/Kconfig
+
 endmenu
 
 source common/Kconfig
diff --git a/arch/riscv/Makefile b/arch/riscv/Makefile
index 4e3318cf1..8947a1860 100644
--- a/arch/riscv/Makefile
+++ b/arch/riscv/Makefile
@@ -7,6 +7,9 @@ cflags-y += -Wall -Wmissing-prototypes -Wstrict-prototypes \
 LDFLAGS += $(ldflags-y)
 LDFLAGS_barebox += -nostdlib
 
+machine-$(CONFIG_MACH_ERIZO)	:= erizo
+board-$(CONFIG_BOARD_ERIZO_GENERIC)	:= erizo-generic
+
 TEXT_BASE = $(CONFIG_TEXT_BASE)
 CPPFLAGS += -DTEXT_BASE=$(CONFIG_TEXT_BASE)
 
diff --git a/arch/riscv/boards/erizo-generic/.gitignore b/arch/riscv/boards/erizo-generic/.gitignore
new file mode 100644
index 000000000..d1165788c
--- /dev/null
+++ b/arch/riscv/boards/erizo-generic/.gitignore
@@ -0,0 +1 @@
+barebox.lds
diff --git a/arch/riscv/boards/erizo-generic/Makefile b/arch/riscv/boards/erizo-generic/Makefile
new file mode 100644
index 000000000..dcfc2937d
--- /dev/null
+++ b/arch/riscv/boards/erizo-generic/Makefile
@@ -0,0 +1 @@
+obj-y += board.o
diff --git a/arch/riscv/boards/erizo-generic/board.c b/arch/riscv/boards/erizo-generic/board.c
new file mode 100644
index 000000000..ecda85001
--- /dev/null
+++ b/arch/riscv/boards/erizo-generic/board.c
@@ -0,0 +1,28 @@
+/*
+ * Copyright (C) 2016 Antony Pavlov <antonynpavlov@gmail.com>
+ *
+ * This file is part of barebox.
+ * See file CREDITS for list of people who contributed to this project.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <common.h>
+#include <driver.h>
+#include <init.h>
+
+static int hostname_init(void)
+{
+	barebox_set_hostname("barebox");
+
+	return 0;
+}
+postcore_initcall(hostname_init);
diff --git a/arch/riscv/dts/erizo.dtsi b/arch/riscv/dts/erizo.dtsi
new file mode 100644
index 000000000..1660ad104
--- /dev/null
+++ b/arch/riscv/dts/erizo.dtsi
@@ -0,0 +1,46 @@
+/dts-v1/;
+
+#include "skeleton.dtsi"
+
+/ {
+	compatible = "miet-riscv-workgroup,erizo";
+
+	#address-cells = <1>;
+	#size-cells = <1>;
+
+	clocks {
+		ref_clk: ref_clk {
+			#clock-cells = <0>;
+			compatible = "fixed-clock";
+			clock-frequency = <24000000>;
+		};
+	};
+
+	cpus {
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		cpu@0 {
+			device_type = "cpu";
+			compatible = "cliffordwolf,picorv32";
+			clocks = <&ref_clk>;
+			reg = <0>;
+		};
+	};
+
+	uart0: uart@90000000 {
+		compatible = "ns16550a";
+		reg = <0x90000000 0x20>;
+		reg-shift = <2>;
+		clocks = <&ref_clk>;
+	};
+
+	gpio0: gpio@91000000 {
+		compatible = "wd,mbl-gpio";
+		reg-names = "dat", "dirout";
+		reg = <0x91000000 0x4>,
+			<0x91000004 0x4>;
+		#gpio-cells = <2>;
+		gpio-controller;
+	};
+};
diff --git a/arch/riscv/dts/erizo_generic.dts b/arch/riscv/dts/erizo_generic.dts
new file mode 100644
index 000000000..b2b1bdda5
--- /dev/null
+++ b/arch/riscv/dts/erizo_generic.dts
@@ -0,0 +1,31 @@
+#include "erizo.dtsi"
+#include <dt-bindings/gpio/gpio.h>
+
+/ {
+	model = "generic Erizo SoC board";
+	compatible = "miet-riscv-workgroup,erizo-generic-board";
+
+	memory {
+		device_type = "memory";
+		reg = <0x80000000 0x00800000>;
+	};
+
+	spi0 {
+		compatible = "spi-gpio";
+		#address-cells = <1>;
+		#size-cells = <0>;
+		gpio-sck  = <&gpio0 0 GPIO_ACTIVE_HIGH>;
+		gpio-miso = <&gpio0 1 GPIO_ACTIVE_HIGH>;
+		gpio-mosi = <&gpio0 2 GPIO_ACTIVE_HIGH>;
+		cs-gpios  = <&gpio0 3 GPIO_ACTIVE_LOW>;
+		num-chipselects = <1>;
+
+		m25p128@0 {
+			compatible = "m25p128", "jedec,spi-nor";
+			#address-cells = <1>;
+			#size-cells = <1>;
+			reg = <0>;
+			spi-max-frequency = <1000000>;
+		};
+	};
+};
diff --git a/arch/riscv/mach-erizo/Kconfig b/arch/riscv/mach-erizo/Kconfig
new file mode 100644
index 000000000..2400b4437
--- /dev/null
+++ b/arch/riscv/mach-erizo/Kconfig
@@ -0,0 +1,11 @@
+if MACH_ERIZO
+
+choice
+	prompt "Board type"
+
+config BOARD_ERIZO_GENERIC
+	bool "erizo generic board"
+
+endchoice
+
+endif
diff --git a/arch/riscv/mach-erizo/Makefile b/arch/riscv/mach-erizo/Makefile
new file mode 100644
index 000000000..d9c51e74c
--- /dev/null
+++ b/arch/riscv/mach-erizo/Makefile
@@ -0,0 +1,3 @@
+# just to build a built-in.o. Otherwise compilation fails when no o-files is
+# created.
+obj- += dummy.o
-- 
2.14.1


_______________________________________________
barebox mailing list
barebox@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/barebox

Re: [RFC v4 02/10] RISC-V: add Erizo SoC support

[Oleksij Rempel]

[-- Attachment #1.1.1: Type: text/plain, Size: 6662 bytes --]

Probably it is better to send it as patch not as RFC ;)

Am 29.09.2017 um 01:12 schrieb Antony Pavlov:
> Erizo is an opensource hardware SoC for FPGA.
> 
> Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
> ---
>  arch/riscv/Kconfig                         | 11 +++++++
>  arch/riscv/Makefile                        |  3 ++
>  arch/riscv/boards/erizo-generic/.gitignore |  1 +
>  arch/riscv/boards/erizo-generic/Makefile   |  1 +
>  arch/riscv/boards/erizo-generic/board.c    | 28 ++++++++++++++++++
>  arch/riscv/dts/erizo.dtsi                  | 46 ++++++++++++++++++++++++++++++
>  arch/riscv/dts/erizo_generic.dts           | 31 ++++++++++++++++++++
>  arch/riscv/mach-erizo/Kconfig              | 11 +++++++
>  arch/riscv/mach-erizo/Makefile             |  3 ++
>  9 files changed, 135 insertions(+)
> 
> diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
> index b2f0817ef..f4bfbea7c 100644
> --- a/arch/riscv/Kconfig
> +++ b/arch/riscv/Kconfig
> @@ -20,6 +20,15 @@ config GENERIC_LINKER_SCRIPT
>  
>  menu "Machine selection"
>  
> +choice
> +	prompt "System type"
> +	default MACH_ERIZO
> +
> +config MACH_ERIZO
> +	bool "erizo family"
> +
> +endchoice
> +
>  choice
>  	prompt "CPU selection"
>  	default CPU_RV_GENERIC
> @@ -62,6 +71,8 @@ config BUILTIN_DTB_NAME
>  	string "DTB to build into the barebox image"
>  	depends on BUILTIN_DTB
>  
> +source arch/riscv/mach-erizo/Kconfig
> +
>  endmenu
>  
>  source common/Kconfig
> diff --git a/arch/riscv/Makefile b/arch/riscv/Makefile
> index 4e3318cf1..8947a1860 100644
> --- a/arch/riscv/Makefile
> +++ b/arch/riscv/Makefile
> @@ -7,6 +7,9 @@ cflags-y += -Wall -Wmissing-prototypes -Wstrict-prototypes \
>  LDFLAGS += $(ldflags-y)
>  LDFLAGS_barebox += -nostdlib
>  
> +machine-$(CONFIG_MACH_ERIZO)	:= erizo
> +board-$(CONFIG_BOARD_ERIZO_GENERIC)	:= erizo-generic
> +
>  TEXT_BASE = $(CONFIG_TEXT_BASE)
>  CPPFLAGS += -DTEXT_BASE=$(CONFIG_TEXT_BASE)
>  
> diff --git a/arch/riscv/boards/erizo-generic/.gitignore b/arch/riscv/boards/erizo-generic/.gitignore
> new file mode 100644
> index 000000000..d1165788c
> --- /dev/null
> +++ b/arch/riscv/boards/erizo-generic/.gitignore
> @@ -0,0 +1 @@
> +barebox.lds
> diff --git a/arch/riscv/boards/erizo-generic/Makefile b/arch/riscv/boards/erizo-generic/Makefile
> new file mode 100644
> index 000000000..dcfc2937d
> --- /dev/null
> +++ b/arch/riscv/boards/erizo-generic/Makefile
> @@ -0,0 +1 @@
> +obj-y += board.o
> diff --git a/arch/riscv/boards/erizo-generic/board.c b/arch/riscv/boards/erizo-generic/board.c
> new file mode 100644
> index 000000000..ecda85001
> --- /dev/null
> +++ b/arch/riscv/boards/erizo-generic/board.c
> @@ -0,0 +1,28 @@
> +/*
> + * Copyright (C) 2016 Antony Pavlov <antonynpavlov@gmail.com>
> + *
> + * This file is part of barebox.
> + * See file CREDITS for list of people who contributed to this project.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2
> + * as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + *
> + */
> +
> +#include <common.h>
> +#include <driver.h>
> +#include <init.h>
> +
> +static int hostname_init(void)
> +{
> +	barebox_set_hostname("barebox");

please, use board name. Maybe: erizo-generic or so.
For network boot the filenames will be constructed as following:
username-hostname-filetype


> +
> +	return 0;
> +}
> +postcore_initcall(hostname_init);
> diff --git a/arch/riscv/dts/erizo.dtsi b/arch/riscv/dts/erizo.dtsi
> new file mode 100644
> index 000000000..1660ad104
> --- /dev/null
> +++ b/arch/riscv/dts/erizo.dtsi
> @@ -0,0 +1,46 @@
> +/dts-v1/;
> +
> +#include "skeleton.dtsi"
> +
> +/ {
> +	compatible = "miet-riscv-workgroup,erizo";
> +
> +	#address-cells = <1>;
> +	#size-cells = <1>;
> +
> +	clocks {
> +		ref_clk: ref_clk {
> +			#clock-cells = <0>;
> +			compatible = "fixed-clock";
> +			clock-frequency = <24000000>;
> +		};
> +	};
> +
> +	cpus {
> +		#address-cells = <1>;
> +		#size-cells = <0>;
> +
> +		cpu@0 {
> +			device_type = "cpu";
> +			compatible = "cliffordwolf,picorv32";
> +			clocks = <&ref_clk>;
> +			reg = <0>;
> +		};
> +	};
> +
> +	uart0: uart@90000000 {
> +		compatible = "ns16550a";
> +		reg = <0x90000000 0x20>;
> +		reg-shift = <2>;
> +		clocks = <&ref_clk>;
> +	};
> +
> +	gpio0: gpio@91000000 {
> +		compatible = "wd,mbl-gpio";
> +		reg-names = "dat", "dirout";
> +		reg = <0x91000000 0x4>,
> +			<0x91000004 0x4>;
> +		#gpio-cells = <2>;
> +		gpio-controller;
> +	};
> +};
> diff --git a/arch/riscv/dts/erizo_generic.dts b/arch/riscv/dts/erizo_generic.dts
> new file mode 100644
> index 000000000..b2b1bdda5
> --- /dev/null
> +++ b/arch/riscv/dts/erizo_generic.dts
> @@ -0,0 +1,31 @@
> +#include "erizo.dtsi"
> +#include <dt-bindings/gpio/gpio.h>
> +
> +/ {
> +	model = "generic Erizo SoC board";
> +	compatible = "miet-riscv-workgroup,erizo-generic-board";
> +
> +	memory {
> +		device_type = "memory";
> +		reg = <0x80000000 0x00800000>;
> +	};
> +
> +	spi0 {
> +		compatible = "spi-gpio";
> +		#address-cells = <1>;
> +		#size-cells = <0>;
> +		gpio-sck  = <&gpio0 0 GPIO_ACTIVE_HIGH>;
> +		gpio-miso = <&gpio0 1 GPIO_ACTIVE_HIGH>;
> +		gpio-mosi = <&gpio0 2 GPIO_ACTIVE_HIGH>;
> +		cs-gpios  = <&gpio0 3 GPIO_ACTIVE_LOW>;
> +		num-chipselects = <1>;
> +
> +		m25p128@0 {
> +			compatible = "m25p128", "jedec,spi-nor";
> +			#address-cells = <1>;
> +			#size-cells = <1>;
> +			reg = <0>;
> +			spi-max-frequency = <1000000>;
> +		};
> +	};
> +};
> diff --git a/arch/riscv/mach-erizo/Kconfig b/arch/riscv/mach-erizo/Kconfig
> new file mode 100644
> index 000000000..2400b4437
> --- /dev/null
> +++ b/arch/riscv/mach-erizo/Kconfig
> @@ -0,0 +1,11 @@
> +if MACH_ERIZO
> +
> +choice
> +	prompt "Board type"
> +
> +config BOARD_ERIZO_GENERIC
> +	bool "erizo generic board"
> +
> +endchoice
> +
> +endif
> diff --git a/arch/riscv/mach-erizo/Makefile b/arch/riscv/mach-erizo/Makefile
> new file mode 100644
> index 000000000..d9c51e74c
> --- /dev/null
> +++ b/arch/riscv/mach-erizo/Makefile
> @@ -0,0 +1,3 @@
> +# just to build a built-in.o. Otherwise compilation fails when no o-files is
> +# created.
> +obj- += dummy.o
> 


-- 
Regards,
Oleksij


[-- Attachment #1.2: OpenPGP digital signature --]
[-- Type: application/pgp-signature, Size: 195 bytes --]

[-- Attachment #2: Type: text/plain, Size: 149 bytes --]

_______________________________________________
barebox mailing list
barebox@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/barebox

Re: [RFC v4 02/10] RISC-V: add Erizo SoC support

[Antony Pavlov]

On Fri, 29 Sep 2017 14:18:40 +0200
Oleksij Rempel <linux@rempel-privat.de> wrote:

> Probably it is better to send it as patch not as RFC ;)

There are still some issues.
 
> Am 29.09.2017 um 01:12 schrieb Antony Pavlov:

...

> > diff --git a/arch/riscv/boards/erizo-generic/board.c b/arch/riscv/boards/erizo-generic/board.c
> > new file mode 100644
> > index 000000000..ecda85001
> > --- /dev/null
> > +++ b/arch/riscv/boards/erizo-generic/board.c
> > @@ -0,0 +1,28 @@
> > +/*
> > + * Copyright (C) 2016 Antony Pavlov <antonynpavlov@gmail.com>
> > + *
> > + * This file is part of barebox.
> > + * See file CREDITS for list of people who contributed to this project.
> > + *
> > + * This program is free software; you can redistribute it and/or modify
> > + * it under the terms of the GNU General Public License version 2
> > + * as published by the Free Software Foundation.
> > + *
> > + * This program is distributed in the hope that it will be useful,
> > + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> > + * GNU General Public License for more details.
> > + *
> > + */
> > +
> > +#include <common.h>
> > +#include <driver.h>
> > +#include <init.h>
> > +
> > +static int hostname_init(void)
> > +{
> > +	barebox_set_hostname("barebox");
> 
> please, use board name. Maybe: erizo-generic or so.
> For network boot the filenames will be constructed as following:
> username-hostname-filetype


That's a good point!


> 
> > +
> > +	return 0;
> > +}
> > +postcore_initcall(hostname_init);


-- 
Best regards,
  Antony Pavlov

_______________________________________________
barebox mailing list
barebox@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/barebox

[RFC v4 03/10] RISC-V: add low-level debug macros for ns16550

[Antony Pavlov]

This patch adds macros for ns16550 port initialisation
and single char output. The macros can be used in
MIPS asm pbl code.

Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
---
 arch/riscv/include/asm/debug_ll_ns16550.h | 186 ++++++++++++++++++++++++++++++
 1 file changed, 186 insertions(+)

diff --git a/arch/riscv/include/asm/debug_ll_ns16550.h b/arch/riscv/include/asm/debug_ll_ns16550.h
new file mode 100644
index 000000000..6929453b1
--- /dev/null
+++ b/arch/riscv/include/asm/debug_ll_ns16550.h
@@ -0,0 +1,186 @@
+/*
+ * Copyright (C) 2016, 2017 Antony Pavlov <antonynpavlov@gmail.com>
+ *
+ * This file is part of barebox.
+ * See file CREDITS for list of people who contributed to this project.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+/** @file
+ *  This file contains declaration for early output support
+ */
+#ifndef __INCLUDE_RISCV_ASM_DEBUG_LL_NS16550_H__
+#define __INCLUDE_RISCV_ASM_DEBUG_LL_NS16550_H__
+
+#include <linux/kconfig.h>
+
+#ifdef CONFIG_DEBUG_LL
+
+#ifndef DEBUG_LL_UART_ADDR
+#error DEBUG_LL_UART_ADDR is undefined!
+#endif
+
+#ifndef DEBUG_LL_UART_SHIFT
+#error DEBUG_LL_UART_SHIFT is undefined!
+#endif
+
+#ifndef DEBUG_LL_UART_DIVISOR
+#error DEBUG_LL_UART_DIVISOR is undefined!
+#endif
+
+#endif /* CONFIG_DEBUG_LL */
+
+#define UART_THR	(0x0 << DEBUG_LL_UART_SHIFT)
+#define UART_RBR	(0x0 << DEBUG_LL_UART_SHIFT)
+#define UART_DLL	(0x0 << DEBUG_LL_UART_SHIFT)
+#define UART_DLM	(0x1 << DEBUG_LL_UART_SHIFT)
+#define UART_LCR	(0x3 << DEBUG_LL_UART_SHIFT)
+#define UART_LSR	(0x5 << DEBUG_LL_UART_SHIFT)
+
+#define UART_LCR_W	0x07	/* Set UART to 8,N,2 & DLAB = 0 */
+#define UART_LCR_DLAB	0x87	/* Set UART to 8,N,2 & DLAB = 1 */
+
+#define UART_LSR_DR	0x01    /* UART received data present */
+#define UART_LSR_THRE	0x20	/* Xmit holding register empty */
+
+#if defined(DEBUG_LL_UART_IOSIZE32)
+#define UART_REG_L	lw
+#define UART_REG_S	sw
+#elif defined(DEBUG_LL_UART_IOSIZE8)
+#define UART_REG_L	lbu
+#define UART_REG_S	sb
+#else
+#error "Please define DEBUG_LL_UART_IOSIZE{8,32}"
+#endif
+
+#ifndef __ASSEMBLY__
+/*
+ * C macros
+ */
+
+#include <asm/io.h>
+
+static inline void PUTC_LL(char ch)
+{
+#ifdef CONFIG_DEBUG_LL
+	while (!(__raw_readl((u8 *)DEBUG_LL_UART_ADDR + UART_LSR) & UART_LSR_THRE))
+		;
+	__raw_writel(ch, (u8 *)DEBUG_LL_UART_ADDR + UART_THR);
+#endif /* CONFIG_DEBUG_LL */
+}
+
+static inline void debug_ll_ns16550_init(void)
+{
+#ifdef CONFIG_DEBUG_LL
+	__raw_writel(UART_LCR_DLAB, (u8 *)DEBUG_LL_UART_ADDR + UART_LCR);
+	__raw_writel(DEBUG_LL_UART_DIVISOR & 0xff, (u8 *)DEBUG_LL_UART_ADDR + UART_DLL);
+	__raw_writel((DEBUG_LL_UART_DIVISOR >> 8) & 0xff, (u8 *)DEBUG_LL_UART_ADDR + UART_DLM);
+	__raw_writel(UART_LCR_W, (u8 *)DEBUG_LL_UART_ADDR + UART_LCR);
+#endif /* CONFIG_DEBUG_LL */
+}
+#else /* __ASSEMBLY__ */
+/*
+ * Macros for use in assembly language code
+ */
+
+.macro	debug_ll_ns16550_init
+#ifdef CONFIG_DEBUG_LL
+	li	t0, DEBUG_LL_UART_ADDR
+
+	li	t1, UART_LCR_DLAB		/* DLAB on */
+	UART_REG_S	t1, UART_LCR(t0)		/* Write it out */
+
+	li	t1, DEBUG_LL_UART_DIVISOR
+	UART_REG_S	t1, UART_DLL(t0)		/* write low order byte */
+	srl	t1, t1, 8
+	UART_REG_S	t1, UART_DLM(t0)		/* write high order byte */
+
+	li	t1, UART_LCR_W			/* DLAB off */
+	UART_REG_S	t1, UART_LCR(t0)		/* Write it out */
+#endif /* CONFIG_DEBUG_LL */
+.endm
+
+/*
+ * output a character in a0
+ */
+.macro	debug_ll_outc_a0
+#ifdef CONFIG_DEBUG_LL
+
+	li	t0, DEBUG_LL_UART_ADDR
+
+201:
+	UART_REG_L	t1, UART_LSR(t0)	/* get line status */
+	andi	t1, t1, UART_LSR_THRE	/* check for transmitter empty */
+	beqz	t1, 201b			/* try again */
+
+	UART_REG_S	a0, UART_THR(t0)	/* write the character */
+
+#endif /* CONFIG_DEBUG_LL */
+.endm
+
+/*
+ * output a character
+ */
+.macro	debug_ll_outc chr
+#ifdef CONFIG_DEBUG_LL
+	li	a0, \chr
+	debug_ll_outc_a0
+#endif /* CONFIG_DEBUG_LL */
+.endm
+
+/*
+ * output CR + NL
+ */
+.macro	debug_ll_ns16550_outnl
+#ifdef CONFIG_DEBUG_LL
+	debug_ll_outc '\r'
+	debug_ll_outc '\n'
+#endif /* CONFIG_DEBUG_LL */
+.endm
+
+/*
+ * check character in input buffer
+ * return value:
+ *  v0 = 0   no character in input buffer
+ *  v0 != 0  character in input buffer
+ */
+.macro	debug_ll_tstc
+#ifdef CONFIG_DEBUG_LL
+	li      t0, DEBUG_LL_UART_ADDR
+
+	/* get line status and check for data present */
+	UART_REG_L	s0, UART_LSR(t0)
+	andi	s0, s0, UART_LSR_DR
+
+#endif /* CONFIG_DEBUG_LL */
+.endm
+
+/*
+ * get character to v0
+ */
+.macro	debug_ll_getc
+#ifdef CONFIG_DEBUG_LL
+
+204:
+	debug_ll_tstc
+
+	/* try again */
+	beqz	s0, 204b
+
+	/* read a character */
+	UART_REG_L	s0, UART_RBR(t0)
+
+#endif /* CONFIG_DEBUG_LL */
+.endm
+#endif /* __ASSEMBLY__ */
+
+#endif /* __INCLUDE_RISCV_ASM_DEBUG_LL_NS16550_H__ */
-- 
2.14.1


_______________________________________________
barebox mailing list
barebox@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/barebox

[RFC v4 04/10] RISC-V: add nmon nano-monitor

[Antony Pavlov]

nmon is a tiny (<1024 bytes) monitor program
for the RV32I processors.

It can operate with NO working RAM at all!

It uses only the processor registers and NS16550-compatible
UART port for operation, so it can be used for a memory
controller setup code debugging.

Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
---
 arch/riscv/Kconfig                  |  24 ++++
 arch/riscv/boot/start.S             |  14 +++
 arch/riscv/include/asm/riscv_nmon.h | 234 ++++++++++++++++++++++++++++++++++++
 3 files changed, 272 insertions(+)

diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index f4bfbea7c..ce5f317cf 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -75,6 +75,30 @@ source arch/riscv/mach-erizo/Kconfig
 
 endmenu
 
+menu "RISC-V specific settings"
+
+config HAS_NMON
+	bool
+
+config NMON
+	bool "nmon"
+	depends on HAS_NMON
+	depends on DEBUG_LL
+	help
+	  Say yes here to add the nmon to pbl.
+	  nmon -- nano-monitor program for the RISC-V processors.
+	  It can operate with NO working RAM, using only
+	  the processor registers.
+
+config NMON_HELP
+	bool "nmon help message"
+	depends on NMON
+	help
+	  Say yes here to get the nmon commands message on
+	  every nmon start.
+
+endmenu
+
 source common/Kconfig
 source commands/Kconfig
 source net/Kconfig
diff --git a/arch/riscv/boot/start.S b/arch/riscv/boot/start.S
index 2fd00f63d..c2ca6f9a1 100644
--- a/arch/riscv/boot/start.S
+++ b/arch/riscv/boot/start.S
@@ -21,12 +21,21 @@
 
 #include <asm-generic/memory_layout.h>
 
+#include "mach/debug_ll.h"
+
+#include "asm/riscv_nmon.h"
+
 	.text
 	.section ".text_entry"
 	.align 2
 
 .globl _start
 _start:
+
+	debug_ll_ns16550_init
+
+	riscv_nmon
+
 	li sp, STACK_BASE + STACK_SIZE
 
 	# make room for HLS and initialize it
@@ -66,9 +75,14 @@ copy_loop:
 	addi	a1, a1, LONGSIZE * 2
 	bgeu	a2, a0, copy_loop
 
+	nmon_outs copy_loop_done_message
+
 	/* Alas! At the moment I can't load main_entry __link__ address
 	   into a0 with la. Use CONFIG_TEXT_BASE instead. This solution
 	   leads to extra cycles for repeat sp initialization. */
 
 	li	a0, CONFIG_TEXT_BASE
 	jalr	a0
+
+copy_loop_done_message:
+	.asciz "\r\ncopy loop done\r\nrestarting...\r\n"
diff --git a/arch/riscv/include/asm/riscv_nmon.h b/arch/riscv/include/asm/riscv_nmon.h
new file mode 100644
index 000000000..717f61334
--- /dev/null
+++ b/arch/riscv/include/asm/riscv_nmon.h
@@ -0,0 +1,234 @@
+/*
+ * nano-monitor for RISC-V CPU
+ *
+ * Copyright (C) 2016, 2017 Antony Pavlov <antonynpavlov@gmail.com>
+ *
+ * This file is part of barebox.
+ * See file CREDITS for list of people who contributed to this project.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#ifndef __ASM_RISCV_NMON_H
+#define __ASM_RISCV_NMON_H
+
+#define CODE_ESC	0x1b
+
+.macro nmon_outs msg
+
+	la	a1, \msg
+
+	jal	_nmon_outs
+
+.endm
+
+/*
+ * output a 32-bit value in hex
+ */
+.macro debug_ll_outhexw
+#ifdef CONFIG_DEBUG_LL
+	move	t6, a0
+	li	t5, 32
+
+202:
+	addi	t5, t5, -4
+	srl	a0, t6, t5
+
+	/* output one hex digit */
+	andi	a0, a0, 15
+	li	t4, 10
+	blt	a0, t4, 203f
+
+	addi	a0, a0, ('a' - '9' - 1)
+
+203:
+	addi	a0, a0, '0'
+
+	debug_ll_outc_a0
+
+	li	t4, 1
+	bge	t5, t4, 202b
+
+#endif /* CONFIG_DEBUG_LL */
+.endm
+
+.macro riscv_nmon
+
+nmon_main_help:
+#ifdef CONFIG_NMON_HELP
+	nmon_outs	msg_nmon_help
+#endif /* CONFIG_NMON_HELP */
+
+nmon_main:
+	nmon_outs	msg_prompt
+
+	debug_ll_getc
+
+	li	a0, 'q'
+	bne	s0, a0, 3f
+
+	jal	_nmon_outc_a0
+
+	j	nmon_exit
+
+3:
+	li	a0, 'd'
+	beq	s0, a0, nmon_cmd_d
+
+	li	a0, 'w'
+	beq	s0, a0, nmon_cmd_w
+
+	li	a0, 'g'
+	beq	s0, a0, nmon_cmd_g
+
+	j	nmon_main_help
+
+nmon_cmd_d:
+	jal	_nmon_outc_a0
+
+	li	a0, ' '
+	jal	_nmon_outc_a0
+
+	jal	_nmon_gethexw
+
+	nmon_outs	msg_nl
+
+	lw	a0, (s0)
+	debug_ll_outhexw
+
+	j	nmon_main
+
+nmon_cmd_w:
+	jal	_nmon_outc_a0
+
+	li	a0, ' '
+	jal	_nmon_outc_a0
+
+	jal	_nmon_gethexw
+	move	s2, s0
+
+	li	a0, ' '
+	jal	_nmon_outc_a0
+	jal	_nmon_gethexw
+
+	sw	s0, 0(s2)
+	j	nmon_main
+
+nmon_cmd_g:
+	jal	_nmon_outc_a0
+
+	li	a0, ' '
+	jal	_nmon_outc_a0
+
+	jal	_nmon_gethexw
+	move	s2, s0
+
+	nmon_outs	msg_nl
+
+	jalr	s2
+	j	nmon_main
+
+_nmon_outc_a0:
+	debug_ll_outc_a0
+	jr	ra
+
+_nmon_outs:
+
+	lb	a0, 0(a1)
+	addi	a1, a1, 1
+	beqz	a0, _nmon_jr_ra_exit
+
+	debug_ll_outc_a0
+
+	j	_nmon_outs
+
+_nmon_gethexw:
+
+	li	t3, 8
+	li	t2, 0
+
+_get_hex_digit:
+	debug_ll_getc
+
+	li	s1, CODE_ESC
+	beq	s0, s1, nmon_main
+
+	li	s1, '0'
+	bge	s0, s1, 0f
+	j	_get_hex_digit
+
+0:
+	li	s1, '9'
+	ble	s0, s1, 9f
+
+	li	s1, 'f'
+	ble	s0, s1, 1f
+	j	_get_hex_digit
+
+1:
+	li	s1, 'a'
+	bge	s0, s1, 8f
+
+	j	_get_hex_digit
+
+8: /* s0 \in {'a', 'b' ... 'f'} */
+	sub	a3, s0, s1
+	addi	a3, a3, 0xa
+	j	0f
+
+9: /* s0 \in {'0', '1' ... '9'} */
+	li	a3, '0'
+	sub	a3, s0, a3
+
+0:	move	a0, s0
+	debug_ll_outc_a0
+
+	sll	t2, t2, 4
+	or	t2, t2, a3
+	li	t0, 1
+	sub	t3, t3, t0
+
+	beqz	t3, 0f
+
+	j	_get_hex_digit
+
+0:
+	move	s0, t2
+
+_nmon_jr_ra_exit:
+	jr	ra
+
+msg_prompt:
+	.asciz "\r\nnmon> "
+
+msg_nl:
+	.asciz "\r\n"
+
+msg_bsp:
+	.asciz "\b \b"
+
+#ifdef CONFIG_NMON_HELP
+msg_nmon_help:
+	.ascii "\r\n\r\nnmon commands:\r\n"
+	.ascii " q - quit\r\n"
+	.ascii " d <addr> - read 32-bit word from <addr>\r\n"
+	.ascii " w <addr> <val> - write 32-bit word to <addr>\r\n"
+	.ascii " g <addr> - jump to <addr>\r\n"
+	.asciz "   use <ESC> key to interrupt current command\r\n"
+#endif /* CONFIG_NMON_HELP */
+
+	.align 2
+nmon_exit:
+	nmon_outs	msg_nl
+
+.endm
+
+#endif /* __ASM_RISCV_NMON_H */
-- 
2.14.1


_______________________________________________
barebox mailing list
barebox@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/barebox

Re: [RFC v4 04/10] RISC-V: add nmon nano-monitor

[Oleksij Rempel]

[-- Attachment #1.1.1: Type: text/plain, Size: 7202 bytes --]

Same as for MIPS

Am 29.09.2017 um 01:12 schrieb Antony Pavlov:
> nmon is a tiny (<1024 bytes) monitor program
> for the RV32I processors.
> 
> It can operate with NO working RAM at all!
> 
> It uses only the processor registers and NS16550-compatible
> UART port for operation, so it can be used for a memory
> controller setup code debugging.
> 
> Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
> ---
>  arch/riscv/Kconfig                  |  24 ++++
>  arch/riscv/boot/start.S             |  14 +++
>  arch/riscv/include/asm/riscv_nmon.h | 234 ++++++++++++++++++++++++++++++++++++
>  3 files changed, 272 insertions(+)
> 
> diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
> index f4bfbea7c..ce5f317cf 100644
> --- a/arch/riscv/Kconfig
> +++ b/arch/riscv/Kconfig
> @@ -75,6 +75,30 @@ source arch/riscv/mach-erizo/Kconfig
>  
>  endmenu
>  
> +menu "RISC-V specific settings"
> +
> +config HAS_NMON
> +	bool
> +
> +config NMON
> +	bool "nmon"
> +	depends on HAS_NMON
> +	depends on DEBUG_LL
> +	help
> +	  Say yes here to add the nmon to pbl.
> +	  nmon -- nano-monitor program for the RISC-V processors.
> +	  It can operate with NO working RAM, using only
> +	  the processor registers.
> +
> +config NMON_HELP
> +	bool "nmon help message"
> +	depends on NMON
> +	help
> +	  Say yes here to get the nmon commands message on
> +	  every nmon start.
> +
> +endmenu
> +
>  source common/Kconfig
>  source commands/Kconfig
>  source net/Kconfig
> diff --git a/arch/riscv/boot/start.S b/arch/riscv/boot/start.S
> index 2fd00f63d..c2ca6f9a1 100644
> --- a/arch/riscv/boot/start.S
> +++ b/arch/riscv/boot/start.S
> @@ -21,12 +21,21 @@
>  
>  #include <asm-generic/memory_layout.h>
>  
> +#include "mach/debug_ll.h"
> +
> +#include "asm/riscv_nmon.h"
> +
>  	.text
>  	.section ".text_entry"
>  	.align 2
>  
>  .globl _start
>  _start:
> +
> +	debug_ll_ns16550_init
> +
> +	riscv_nmon
> +
>  	li sp, STACK_BASE + STACK_SIZE
>  
>  	# make room for HLS and initialize it
> @@ -66,9 +75,14 @@ copy_loop:
>  	addi	a1, a1, LONGSIZE * 2
>  	bgeu	a2, a0, copy_loop
>  
> +	nmon_outs copy_loop_done_message
> +
>  	/* Alas! At the moment I can't load main_entry __link__ address
>  	   into a0 with la. Use CONFIG_TEXT_BASE instead. This solution
>  	   leads to extra cycles for repeat sp initialization. */
>  
>  	li	a0, CONFIG_TEXT_BASE
>  	jalr	a0
> +
> +copy_loop_done_message:
> +	.asciz "\r\ncopy loop done\r\nrestarting...\r\n"
> diff --git a/arch/riscv/include/asm/riscv_nmon.h b/arch/riscv/include/asm/riscv_nmon.h
> new file mode 100644
> index 000000000..717f61334
> --- /dev/null
> +++ b/arch/riscv/include/asm/riscv_nmon.h

may be arch/riscv/include/asm/pbl_nmon.h instead?
to use same naming shema as for existing arch:
arch/mips/include/asm/pbl_nmon.h

every thing else seems to be nearly identical with MIPS, except some
instruction differences.

> @@ -0,0 +1,234 @@
> +/*
> + * nano-monitor for RISC-V CPU
> + *
> + * Copyright (C) 2016, 2017 Antony Pavlov <antonynpavlov@gmail.com>
> + *
> + * This file is part of barebox.
> + * See file CREDITS for list of people who contributed to this project.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2
> + * as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + *
> + */
> +
> +#ifndef __ASM_RISCV_NMON_H
> +#define __ASM_RISCV_NMON_H
> +
> +#define CODE_ESC	0x1b
> +
> +.macro nmon_outs msg
> +
> +	la	a1, \msg
> +
> +	jal	_nmon_outs
> +
> +.endm
> +
> +/*
> + * output a 32-bit value in hex
> + */
> +.macro debug_ll_outhexw
> +#ifdef CONFIG_DEBUG_LL
> +	move	t6, a0
> +	li	t5, 32
> +
> +202:
> +	addi	t5, t5, -4
> +	srl	a0, t6, t5
> +
> +	/* output one hex digit */
> +	andi	a0, a0, 15
> +	li	t4, 10
> +	blt	a0, t4, 203f
> +
> +	addi	a0, a0, ('a' - '9' - 1)
> +
> +203:
> +	addi	a0, a0, '0'
> +
> +	debug_ll_outc_a0
> +
> +	li	t4, 1
> +	bge	t5, t4, 202b
> +
> +#endif /* CONFIG_DEBUG_LL */
> +.endm
> +
> +.macro riscv_nmon
> +
> +nmon_main_help:
> +#ifdef CONFIG_NMON_HELP
> +	nmon_outs	msg_nmon_help
> +#endif /* CONFIG_NMON_HELP */
> +
> +nmon_main:
> +	nmon_outs	msg_prompt
> +
> +	debug_ll_getc
> +
> +	li	a0, 'q'
> +	bne	s0, a0, 3f
> +
> +	jal	_nmon_outc_a0
> +
> +	j	nmon_exit
> +
> +3:
> +	li	a0, 'd'
> +	beq	s0, a0, nmon_cmd_d
> +
> +	li	a0, 'w'
> +	beq	s0, a0, nmon_cmd_w
> +
> +	li	a0, 'g'
> +	beq	s0, a0, nmon_cmd_g
> +
> +	j	nmon_main_help
> +
> +nmon_cmd_d:
> +	jal	_nmon_outc_a0
> +
> +	li	a0, ' '
> +	jal	_nmon_outc_a0
> +
> +	jal	_nmon_gethexw
> +
> +	nmon_outs	msg_nl
> +
> +	lw	a0, (s0)
> +	debug_ll_outhexw
> +
> +	j	nmon_main
> +
> +nmon_cmd_w:
> +	jal	_nmon_outc_a0
> +
> +	li	a0, ' '
> +	jal	_nmon_outc_a0
> +
> +	jal	_nmon_gethexw
> +	move	s2, s0
> +
> +	li	a0, ' '
> +	jal	_nmon_outc_a0
> +	jal	_nmon_gethexw
> +
> +	sw	s0, 0(s2)
> +	j	nmon_main
> +
> +nmon_cmd_g:
> +	jal	_nmon_outc_a0
> +
> +	li	a0, ' '
> +	jal	_nmon_outc_a0
> +
> +	jal	_nmon_gethexw
> +	move	s2, s0
> +
> +	nmon_outs	msg_nl
> +
> +	jalr	s2
> +	j	nmon_main
> +
> +_nmon_outc_a0:
> +	debug_ll_outc_a0
> +	jr	ra
> +
> +_nmon_outs:
> +
> +	lb	a0, 0(a1)
> +	addi	a1, a1, 1
> +	beqz	a0, _nmon_jr_ra_exit
> +
> +	debug_ll_outc_a0
> +
> +	j	_nmon_outs
> +
> +_nmon_gethexw:
> +
> +	li	t3, 8
> +	li	t2, 0
> +
> +_get_hex_digit:
> +	debug_ll_getc
> +
> +	li	s1, CODE_ESC
> +	beq	s0, s1, nmon_main
> +
> +	li	s1, '0'
> +	bge	s0, s1, 0f
> +	j	_get_hex_digit
> +
> +0:
> +	li	s1, '9'
> +	ble	s0, s1, 9f
> +
> +	li	s1, 'f'
> +	ble	s0, s1, 1f
> +	j	_get_hex_digit
> +
> +1:
> +	li	s1, 'a'
> +	bge	s0, s1, 8f
> +
> +	j	_get_hex_digit
> +
> +8: /* s0 \in {'a', 'b' ... 'f'} */
> +	sub	a3, s0, s1
> +	addi	a3, a3, 0xa
> +	j	0f
> +
> +9: /* s0 \in {'0', '1' ... '9'} */
> +	li	a3, '0'
> +	sub	a3, s0, a3
> +
> +0:	move	a0, s0
> +	debug_ll_outc_a0
> +
> +	sll	t2, t2, 4
> +	or	t2, t2, a3
> +	li	t0, 1
> +	sub	t3, t3, t0
> +
> +	beqz	t3, 0f
> +
> +	j	_get_hex_digit
> +
> +0:
> +	move	s0, t2
> +
> +_nmon_jr_ra_exit:
> +	jr	ra
> +
> +msg_prompt:
> +	.asciz "\r\nnmon> "
> +
> +msg_nl:
> +	.asciz "\r\n"
> +
> +msg_bsp:
> +	.asciz "\b \b"
> +
> +#ifdef CONFIG_NMON_HELP
> +msg_nmon_help:
> +	.ascii "\r\n\r\nnmon commands:\r\n"
> +	.ascii " q - quit\r\n"
> +	.ascii " d <addr> - read 32-bit word from <addr>\r\n"
> +	.ascii " w <addr> <val> - write 32-bit word to <addr>\r\n"
> +	.ascii " g <addr> - jump to <addr>\r\n"
> +	.asciz "   use <ESC> key to interrupt current command\r\n"
> +#endif /* CONFIG_NMON_HELP */
> +
> +	.align 2
> +nmon_exit:
> +	nmon_outs	msg_nl
> +
> +.endm
> +
> +#endif /* __ASM_RISCV_NMON_H */
> 


-- 
Regards,
Oleksij


[-- Attachment #1.2: OpenPGP digital signature --]
[-- Type: application/pgp-signature, Size: 195 bytes --]

[-- Attachment #2: Type: text/plain, Size: 149 bytes --]

_______________________________________________
barebox mailing list
barebox@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/barebox

Re: [RFC v4 04/10] RISC-V: add nmon nano-monitor

[Antony Pavlov]

On Fri, 29 Sep 2017 14:26:34 +0200
Oleksij Rempel <linux@rempel-privat.de> wrote:

> Same as for MIPS
> 

Yes, I have based arch/riscv on arch/mips.

> Am 29.09.2017 um 01:12 schrieb Antony Pavlov:

...

> > diff --git a/arch/riscv/include/asm/riscv_nmon.h b/arch/riscv/include/asm/riscv_nmon.h
> > new file mode 100644
> > index 000000000..717f61334
> > --- /dev/null
> > +++ b/arch/riscv/include/asm/riscv_nmon.h
> 
> may be arch/riscv/include/asm/pbl_nmon.h instead?
> to use same naming shema as for existing arch:
> arch/mips/include/asm/pbl_nmon.h

Contrariwise! I have a plan to sync mips naming schema with riscv.

> every thing else seems to be nearly identical with MIPS, except some
> instruction differences.

Little wonder, since RISC-V ISA looks like reduced MIPS ISA.

I can recomend the notable paper on ISA ideas behind RISC-V

  Design of the RISC-V Instruction Set Architecture by Andrew Waterman
  http://escholarship.org/uc/item/7zj0b3m7#page-14

 
> > @@ -0,0 +1,234 @@
> > +/*
> > + * nano-monitor for RISC-V CPU
> > + *
> > + * Copyright (C) 2016, 2017 Antony Pavlov <antonynpavlov@gmail.com>
> > + *
> > + * This file is part of barebox.
> > + * See file CREDITS for list of people who contributed to this project.
> > + *
> > + * This program is free software; you can redistribute it and/or modify
> > + * it under the terms of the GNU General Public License version 2
> > + * as published by the Free Software Foundation.
> > + *
> > + * This program is distributed in the hope that it will be useful,
> > + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> > + * GNU General Public License for more details.
> > + *
> > + */
> > +
> > +#ifndef __ASM_RISCV_NMON_H
> > +#define __ASM_RISCV_NMON_H
> > +
> > +#define CODE_ESC	0x1b
> > +
> > +.macro nmon_outs msg
> > +
> > +	la	a1, \msg
> > +
> > +	jal	_nmon_outs
> > +
> > +.endm
> > +
> > +/*
> > + * output a 32-bit value in hex
> > + */
> > +.macro debug_ll_outhexw
> > +#ifdef CONFIG_DEBUG_LL
> > +	move	t6, a0
> > +	li	t5, 32
> > +
> > +202:
> > +	addi	t5, t5, -4
> > +	srl	a0, t6, t5
> > +
> > +	/* output one hex digit */
> > +	andi	a0, a0, 15
> > +	li	t4, 10
> > +	blt	a0, t4, 203f
> > +
> > +	addi	a0, a0, ('a' - '9' - 1)
> > +
> > +203:
> > +	addi	a0, a0, '0'
> > +
> > +	debug_ll_outc_a0
> > +
> > +	li	t4, 1
> > +	bge	t5, t4, 202b
> > +
> > +#endif /* CONFIG_DEBUG_LL */
> > +.endm
> > +
> > +.macro riscv_nmon
> > +
> > +nmon_main_help:
> > +#ifdef CONFIG_NMON_HELP
> > +	nmon_outs	msg_nmon_help
> > +#endif /* CONFIG_NMON_HELP */
> > +
> > +nmon_main:
> > +	nmon_outs	msg_prompt
> > +
> > +	debug_ll_getc
> > +
> > +	li	a0, 'q'
> > +	bne	s0, a0, 3f
> > +
> > +	jal	_nmon_outc_a0
> > +
> > +	j	nmon_exit
> > +
> > +3:
> > +	li	a0, 'd'
> > +	beq	s0, a0, nmon_cmd_d
> > +
> > +	li	a0, 'w'
> > +	beq	s0, a0, nmon_cmd_w
> > +
> > +	li	a0, 'g'
> > +	beq	s0, a0, nmon_cmd_g
> > +
> > +	j	nmon_main_help
> > +
> > +nmon_cmd_d:
> > +	jal	_nmon_outc_a0
> > +
> > +	li	a0, ' '
> > +	jal	_nmon_outc_a0
> > +
> > +	jal	_nmon_gethexw
> > +
> > +	nmon_outs	msg_nl
> > +
> > +	lw	a0, (s0)
> > +	debug_ll_outhexw
> > +
> > +	j	nmon_main
> > +
> > +nmon_cmd_w:
> > +	jal	_nmon_outc_a0
> > +
> > +	li	a0, ' '
> > +	jal	_nmon_outc_a0
> > +
> > +	jal	_nmon_gethexw
> > +	move	s2, s0
> > +
> > +	li	a0, ' '
> > +	jal	_nmon_outc_a0
> > +	jal	_nmon_gethexw
> > +
> > +	sw	s0, 0(s2)
> > +	j	nmon_main
> > +
> > +nmon_cmd_g:
> > +	jal	_nmon_outc_a0
> > +
> > +	li	a0, ' '
> > +	jal	_nmon_outc_a0
> > +
> > +	jal	_nmon_gethexw
> > +	move	s2, s0
> > +
> > +	nmon_outs	msg_nl
> > +
> > +	jalr	s2
> > +	j	nmon_main
> > +
> > +_nmon_outc_a0:
> > +	debug_ll_outc_a0
> > +	jr	ra
> > +
> > +_nmon_outs:
> > +
> > +	lb	a0, 0(a1)
> > +	addi	a1, a1, 1
> > +	beqz	a0, _nmon_jr_ra_exit
> > +
> > +	debug_ll_outc_a0
> > +
> > +	j	_nmon_outs
> > +
> > +_nmon_gethexw:
> > +
> > +	li	t3, 8
> > +	li	t2, 0
> > +
> > +_get_hex_digit:
> > +	debug_ll_getc
> > +
> > +	li	s1, CODE_ESC
> > +	beq	s0, s1, nmon_main
> > +
> > +	li	s1, '0'
> > +	bge	s0, s1, 0f
> > +	j	_get_hex_digit
> > +
> > +0:
> > +	li	s1, '9'
> > +	ble	s0, s1, 9f
> > +
> > +	li	s1, 'f'
> > +	ble	s0, s1, 1f
> > +	j	_get_hex_digit
> > +
> > +1:
> > +	li	s1, 'a'
> > +	bge	s0, s1, 8f
> > +
> > +	j	_get_hex_digit
> > +
> > +8: /* s0 \in {'a', 'b' ... 'f'} */
> > +	sub	a3, s0, s1
> > +	addi	a3, a3, 0xa
> > +	j	0f
> > +
> > +9: /* s0 \in {'0', '1' ... '9'} */
> > +	li	a3, '0'
> > +	sub	a3, s0, a3
> > +
> > +0:	move	a0, s0
> > +	debug_ll_outc_a0
> > +
> > +	sll	t2, t2, 4
> > +	or	t2, t2, a3
> > +	li	t0, 1
> > +	sub	t3, t3, t0
> > +
> > +	beqz	t3, 0f
> > +
> > +	j	_get_hex_digit
> > +
> > +0:
> > +	move	s0, t2
> > +
> > +_nmon_jr_ra_exit:
> > +	jr	ra
> > +
> > +msg_prompt:
> > +	.asciz "\r\nnmon> "
> > +
> > +msg_nl:
> > +	.asciz "\r\n"
> > +
> > +msg_bsp:
> > +	.asciz "\b \b"
> > +
> > +#ifdef CONFIG_NMON_HELP
> > +msg_nmon_help:
> > +	.ascii "\r\n\r\nnmon commands:\r\n"
> > +	.ascii " q - quit\r\n"
> > +	.ascii " d <addr> - read 32-bit word from <addr>\r\n"
> > +	.ascii " w <addr> <val> - write 32-bit word to <addr>\r\n"
> > +	.ascii " g <addr> - jump to <addr>\r\n"
> > +	.asciz "   use <ESC> key to interrupt current command\r\n"
> > +#endif /* CONFIG_NMON_HELP */
> > +
> > +	.align 2
> > +nmon_exit:
> > +	nmon_outs	msg_nl
> > +
> > +.endm
> > +
> > +#endif /* __ASM_RISCV_NMON_H */
> > 
> 
> 
> -- 
> Regards,
> Oleksij
> 


-- 
Best regards,
  Antony Pavlov

_______________________________________________
barebox mailing list
barebox@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/barebox

[RFC v4 05/10] RISC-V: erizo: add DEBUG_LL support

[Antony Pavlov]

Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
---
 arch/riscv/Kconfig                            |  1 +
 arch/riscv/mach-erizo/include/mach/debug_ll.h | 37 +++++++++++++++++++++++++++
 2 files changed, 38 insertions(+)

diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index ce5f317cf..cf02ecf27 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -26,6 +26,7 @@ choice
 
 config MACH_ERIZO
 	bool "erizo family"
+	select HAS_DEBUG_LL
 
 endchoice
 
diff --git a/arch/riscv/mach-erizo/include/mach/debug_ll.h b/arch/riscv/mach-erizo/include/mach/debug_ll.h
new file mode 100644
index 000000000..913b323d9
--- /dev/null
+++ b/arch/riscv/mach-erizo/include/mach/debug_ll.h
@@ -0,0 +1,37 @@
+/*
+ * Copyright (C) 2017 Antony Pavlov <antonynpavlov@gmail.com>
+ *
+ * This file is part of barebox.
+ * See file CREDITS for list of people who contributed to this project.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#ifndef __MACH_ERIZO_DEBUG_LL__
+#define __MACH_ERIZO_DEBUG_LL__
+
+/** @file
+ *  This File contains declaration for early output support
+ */
+
+#include <linux/kconfig.h>
+
+#define DEBUG_LL_UART_ADDR	0x90000000
+#define DEBUG_LL_UART_SHIFT	2
+#define DEBUG_LL_UART_IOSIZE32
+
+#define DEBUG_LL_UART_CLK       (24000000 / 16)
+#define DEBUG_LL_UART_BPS       CONFIG_BAUDRATE
+#define DEBUG_LL_UART_DIVISOR   (DEBUG_LL_UART_CLK / DEBUG_LL_UART_BPS)
+
+#include <asm/debug_ll_ns16550.h>
+
+#endif /* __MACH_ERIZO_DEBUG_LL__ */
-- 
2.14.1


_______________________________________________
barebox mailing list
barebox@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/barebox

[RFC v4 06/10] RISC-V: erizo: enable NMON

[Antony Pavlov]

Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
---
 arch/riscv/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index cf02ecf27..f350269e6 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -27,6 +27,7 @@ choice
 config MACH_ERIZO
 	bool "erizo family"
 	select HAS_DEBUG_LL
+	select HAS_NMON
 
 endchoice
 
-- 
2.14.1


_______________________________________________
barebox mailing list
barebox@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/barebox

[RFC v4 07/10] RISC-V: erizo: add nmon image creation

[Antony Pavlov]

Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
---
 arch/riscv/Makefile      | 11 +++++++++++
 scripts/erizo-nmon-image |  3 +++
 2 files changed, 14 insertions(+)

diff --git a/arch/riscv/Makefile b/arch/riscv/Makefile
index 8947a1860..0b282538a 100644
--- a/arch/riscv/Makefile
+++ b/arch/riscv/Makefile
@@ -69,3 +69,14 @@ CFLAGS += $(cflags-y)
 lds-y	:= arch/riscv/lib/barebox.lds
 
 CLEAN_FILES += arch/riscv/lib/barebox.lds
+
+ifeq ($(CONFIG_MACH_ERIZO),y)
+KBUILD_IMAGE := barebox.erizo.nmon
+endif
+
+quiet_cmd_erizo_nmon_image = MKIMAGE $@
+      cmd_erizo_nmon_image = $(srctree)/scripts/erizo-nmon-image $< $@ || \
+	echo "WARNING: Couldn't create erizo nmon image due to previous errors."
+
+barebox.erizo.nmon: $(KBUILD_BINARY) FORCE
+	$(call if_changed,erizo_nmon_image)
diff --git a/scripts/erizo-nmon-image b/scripts/erizo-nmon-image
new file mode 100755
index 000000000..4f0185b6d
--- /dev/null
+++ b/scripts/erizo-nmon-image
@@ -0,0 +1,3 @@
+#!/bin/sh
+
+hexdump -v -e '/4 "%08x\n"' $1 | perl -e '$a = 0x80000000; while (<>) { chop; printf("expect \"nmon> \"\n"); printf("send \"w%08x$_\"\n", $a); $a = $a + 4; }' > $2
-- 
2.14.1


_______________________________________________
barebox mailing list
barebox@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/barebox

[RFC v4 08/10] RISC-V: add erizo_generic_defconfig

[Antony Pavlov]

Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
---
 arch/riscv/configs/erizo_generic_defconfig | 55 ++++++++++++++++++++++++++++++
 1 file changed, 55 insertions(+)

diff --git a/arch/riscv/configs/erizo_generic_defconfig b/arch/riscv/configs/erizo_generic_defconfig
new file mode 100644
index 000000000..8ccad8934
--- /dev/null
+++ b/arch/riscv/configs/erizo_generic_defconfig
@@ -0,0 +1,55 @@
+CONFIG_32BIT=y
+CONFIG_BUILTIN_DTB=y
+CONFIG_BUILTIN_DTB_NAME="erizo_generic"
+# CONFIG_GLOBALVAR is not set
+CONFIG_TEXT_BASE=0x80000000
+CONFIG_MEMORY_LAYOUT_FIXED=y
+CONFIG_STACK_BASE=0x800e0000
+CONFIG_STACK_SIZE=0x20000
+CONFIG_MALLOC_BASE=0x80100000
+CONFIG_MALLOC_SIZE=0x100000
+CONFIG_MALLOC_TLSF=y
+CONFIG_PANIC_HANG=y
+CONFIG_HUSH_FANCY_PROMPT=y
+CONFIG_CMDLINE_EDITING=y
+CONFIG_AUTO_COMPLETE=y
+# CONFIG_ERRNO_MESSAGES is not set
+# CONFIG_TIMESTAMP is not set
+# CONFIG_BOOTM is not set
+# CONFIG_ENV_HANDLING is not set
+CONFIG_POLLER=y
+CONFIG_DEBUG_LL=y
+CONFIG_LONGHELP=y
+CONFIG_CMD_IOMEM=y
+CONFIG_CMD_IMD=y
+CONFIG_CMD_MEMINFO=y
+CONFIG_CMD_GO=y
+CONFIG_CMD_LOADY=y
+CONFIG_CMD_CMP=y
+CONFIG_CMD_MD5SUM=y
+CONFIG_CMD_SHA1SUM=y
+CONFIG_CMD_MSLEEP=y
+CONFIG_CMD_SLEEP=y
+CONFIG_CMD_MEMTEST=y
+CONFIG_CMD_MM=y
+CONFIG_CMD_FLASH=y
+CONFIG_CMD_GPIO=y
+CONFIG_CMD_I2C=y
+CONFIG_CMD_SPI=y
+CONFIG_CMD_OF_DUMP=y
+CONFIG_CMD_TIME=y
+CONFIG_CMD_DHRYSTONE=y
+CONFIG_OFDEVICE=y
+CONFIG_DRIVER_SERIAL_NS16550=y
+CONFIG_DRIVER_SPI_GPIO=y
+CONFIG_I2C=y
+CONFIG_I2C_GPIO=y
+CONFIG_MTD=y
+# CONFIG_MTD_OOB_DEVICE is not set
+CONFIG_MTD_M25P80=y
+CONFIG_CLOCKSOURCE_DUMMY_RATE=60000
+CONFIG_EEPROM_AT25=y
+CONFIG_EEPROM_AT24=y
+CONFIG_GPIO_GENERIC_PLATFORM=y
+# CONFIG_PINCTRL is not set
+CONFIG_DIGEST_CRC32_GENERIC=y
-- 
2.14.1


_______________________________________________
barebox mailing list
barebox@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/barebox

Re: [RFC v4 08/10] RISC-V: add erizo_generic_defconfig

[Oleksij Rempel]

[-- Attachment #1.1.1: Type: text/plain, Size: 2079 bytes --]

Am 29.09.2017 um 01:12 schrieb Antony Pavlov:
> Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
> ---
>  arch/riscv/configs/erizo_generic_defconfig | 55 ++++++++++++++++++++++++++++++
>  1 file changed, 55 insertions(+)
> 
> diff --git a/arch/riscv/configs/erizo_generic_defconfig b/arch/riscv/configs/erizo_generic_defconfig
> new file mode 100644
> index 000000000..8ccad8934
> --- /dev/null
> +++ b/arch/riscv/configs/erizo_generic_defconfig
> @@ -0,0 +1,55 @@
> +CONFIG_32BIT=y
> +CONFIG_BUILTIN_DTB=y
> +CONFIG_BUILTIN_DTB_NAME="erizo_generic"
> +# CONFIG_GLOBALVAR is not set
> +CONFIG_TEXT_BASE=0x80000000
> +CONFIG_MEMORY_LAYOUT_FIXED=y
> +CONFIG_STACK_BASE=0x800e0000
> +CONFIG_STACK_SIZE=0x20000
> +CONFIG_MALLOC_BASE=0x80100000
> +CONFIG_MALLOC_SIZE=0x100000
> +CONFIG_MALLOC_TLSF=y
> +CONFIG_PANIC_HANG=y
> +CONFIG_HUSH_FANCY_PROMPT=y
> +CONFIG_CMDLINE_EDITING=y
> +CONFIG_AUTO_COMPLETE=y
> +# CONFIG_ERRNO_MESSAGES is not set
> +# CONFIG_TIMESTAMP is not set
> +# CONFIG_BOOTM is not set
> +# CONFIG_ENV_HANDLING is not set
> +CONFIG_POLLER=y
> +CONFIG_DEBUG_LL=y
> +CONFIG_LONGHELP=y
> +CONFIG_CMD_IOMEM=y
> +CONFIG_CMD_IMD=y
> +CONFIG_CMD_MEMINFO=y
> +CONFIG_CMD_GO=y
> +CONFIG_CMD_LOADY=y
> +CONFIG_CMD_CMP=y
> +CONFIG_CMD_MD5SUM=y
> +CONFIG_CMD_SHA1SUM=y
> +CONFIG_CMD_MSLEEP=y
> +CONFIG_CMD_SLEEP=y
> +CONFIG_CMD_MEMTEST=y
> +CONFIG_CMD_MM=y
> +CONFIG_CMD_FLASH=y
> +CONFIG_CMD_GPIO=y
> +CONFIG_CMD_I2C=y
> +CONFIG_CMD_SPI=y
> +CONFIG_CMD_OF_DUMP=y
> +CONFIG_CMD_TIME=y
> +CONFIG_CMD_DHRYSTONE=y
> +CONFIG_OFDEVICE=y
> +CONFIG_DRIVER_SERIAL_NS16550=y
> +CONFIG_DRIVER_SPI_GPIO=y
> +CONFIG_I2C=y
> +CONFIG_I2C_GPIO=y
> +CONFIG_MTD=y
> +# CONFIG_MTD_OOB_DEVICE is not set
> +CONFIG_MTD_M25P80=y
> +CONFIG_CLOCKSOURCE_DUMMY_RATE=60000
> +CONFIG_EEPROM_AT25=y
> +CONFIG_EEPROM_AT24=y

hm... none of it seems to be in devicetree. Do you need this eeproms?

> +CONFIG_GPIO_GENERIC_PLATFORM=y
> +# CONFIG_PINCTRL is not set
> +CONFIG_DIGEST_CRC32_GENERIC=y
> 


-- 
Regards,
Oleksij


[-- Attachment #1.2: OpenPGP digital signature --]
[-- Type: application/pgp-signature, Size: 195 bytes --]

[-- Attachment #2: Type: text/plain, Size: 149 bytes --]

_______________________________________________
barebox mailing list
barebox@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/barebox

Re: [RFC v4 08/10] RISC-V: add erizo_generic_defconfig

[Antony Pavlov]

On Fri, 29 Sep 2017 14:29:21 +0200
Oleksij Rempel <linux@rempel-privat.de> wrote:

> Am 29.09.2017 um 01:12 schrieb Antony Pavlov:
> > Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
> > ---
> >  arch/riscv/configs/erizo_generic_defconfig | 55 ++++++++++++++++++++++++++++++
> >  1 file changed, 55 insertions(+)
> > 
> > diff --git a/arch/riscv/configs/erizo_generic_defconfig b/arch/riscv/configs/erizo_generic_defconfig
> > new file mode 100644
> > index 000000000..8ccad8934
> > --- /dev/null
> > +++ b/arch/riscv/configs/erizo_generic_defconfig
> > @@ -0,0 +1,55 @@
> > +CONFIG_32BIT=y
> > +CONFIG_BUILTIN_DTB=y
> > +CONFIG_BUILTIN_DTB_NAME="erizo_generic"
> > +# CONFIG_GLOBALVAR is not set
> > +CONFIG_TEXT_BASE=0x80000000
> > +CONFIG_MEMORY_LAYOUT_FIXED=y
> > +CONFIG_STACK_BASE=0x800e0000
> > +CONFIG_STACK_SIZE=0x20000
> > +CONFIG_MALLOC_BASE=0x80100000
> > +CONFIG_MALLOC_SIZE=0x100000
> > +CONFIG_MALLOC_TLSF=y
> > +CONFIG_PANIC_HANG=y
> > +CONFIG_HUSH_FANCY_PROMPT=y
> > +CONFIG_CMDLINE_EDITING=y
> > +CONFIG_AUTO_COMPLETE=y
> > +# CONFIG_ERRNO_MESSAGES is not set
> > +# CONFIG_TIMESTAMP is not set
> > +# CONFIG_BOOTM is not set
> > +# CONFIG_ENV_HANDLING is not set
> > +CONFIG_POLLER=y
> > +CONFIG_DEBUG_LL=y
> > +CONFIG_LONGHELP=y
> > +CONFIG_CMD_IOMEM=y
> > +CONFIG_CMD_IMD=y
> > +CONFIG_CMD_MEMINFO=y
> > +CONFIG_CMD_GO=y
> > +CONFIG_CMD_LOADY=y
> > +CONFIG_CMD_CMP=y
> > +CONFIG_CMD_MD5SUM=y
> > +CONFIG_CMD_SHA1SUM=y
> > +CONFIG_CMD_MSLEEP=y
> > +CONFIG_CMD_SLEEP=y
> > +CONFIG_CMD_MEMTEST=y
> > +CONFIG_CMD_MM=y
> > +CONFIG_CMD_FLASH=y
> > +CONFIG_CMD_GPIO=y
> > +CONFIG_CMD_I2C=y
> > +CONFIG_CMD_SPI=y
> > +CONFIG_CMD_OF_DUMP=y
> > +CONFIG_CMD_TIME=y
> > +CONFIG_CMD_DHRYSTONE=y
> > +CONFIG_OFDEVICE=y
> > +CONFIG_DRIVER_SERIAL_NS16550=y
> > +CONFIG_DRIVER_SPI_GPIO=y
> > +CONFIG_I2C=y
> > +CONFIG_I2C_GPIO=y
> > +CONFIG_MTD=y
> > +# CONFIG_MTD_OOB_DEVICE is not set
> > +CONFIG_MTD_M25P80=y
> > +CONFIG_CLOCKSOURCE_DUMMY_RATE=60000
> > +CONFIG_EEPROM_AT25=y
> > +CONFIG_EEPROM_AT24=y
> 
> hm... none of it seems to be in devicetree. Do you need this eeproms?

My bad! These options used in development branch.

In my RICS-V TODO list I have the 'add support for Opencores I2C and SPI IP-blocks' record.

At the moment I work on testing bitbanged SPI and I2C on real FPGA boards.
Next I will try to use Opencores I2C and SPI IP-blocks instead of GPIO bitbang.

> 
> > +CONFIG_GPIO_GENERIC_PLATFORM=y
> > +# CONFIG_PINCTRL is not set
> > +CONFIG_DIGEST_CRC32_GENERIC=y
> > 

-- 
Best regards,
  Antony Pavlov

_______________________________________________
barebox mailing list
barebox@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/barebox

[RFC v4 09/10] scripts: add nmon-loader

[Antony Pavlov]

Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
---
 scripts/nmon-loader | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)

diff --git a/scripts/nmon-loader b/scripts/nmon-loader
new file mode 100755
index 000000000..d80a53097
--- /dev/null
+++ b/scripts/nmon-loader
@@ -0,0 +1,31 @@
+#!/usr/bin/expect -f
+
+# device
+set image [lindex $argv 0];
+set modem [lindex $argv 1];
+set speed [lindex $argv 2];
+
+if {$argc != 3} {
+    puts "Usage:"
+    puts "    nmon-loader.expect <file> <device> <speed>"
+    exit 2
+}
+
+# keep it open
+exec sh -c "sleep 3 < $modem" &
+
+# serial port parameters
+exec stty -F $modem $speed raw -clocal -echo -istrip -hup
+
+# connect
+send_user "connecting to $modem, exit with ~.\n"
+spawn -open [open $modem w+]
+send_user "connected\n"
+send "\r"
+
+source $image
+
+interact {
+    ~- exit
+    ~~ {send "\034"}
+}
-- 
2.14.1


_______________________________________________
barebox mailing list
barebox@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/barebox

[RFC v4 10/10] Documentation: add RISC-V docs

[Antony Pavlov]

Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
---
 Documentation/boards/riscv.rst | 110 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 110 insertions(+)

diff --git a/Documentation/boards/riscv.rst b/Documentation/boards/riscv.rst
new file mode 100644
index 000000000..912f16786
--- /dev/null
+++ b/Documentation/boards/riscv.rst
@@ -0,0 +1,110 @@
+RISC-V
+======
+
+At the moment only qemu emulator is supported (see https://github.com/riscv/riscv-isa-sim
+for details).
+
+Running RISC-V barebox on qemu
+------------------------------
+
+Obtain RISC-V GCC/Newlib Toolchain,
+see https://github.com/riscv/riscv-tools/blob/master/README.md
+for details. The ``build.sh`` script from ``riscv-tools`` should
+create toolchain.
+
+Next compile qemu emulator::
+
+  $ git clone -b 20170824.erizo https://github.com/miet-riscv-workgroup/riscv-qemu
+  $ cd riscv-qemu
+  $ cap="no" ./configure \
+    --extra-cflags="-Wno-maybe-uninitialized" \
+    --audio-drv-list="" \
+    --disable-attr \
+    --disable-blobs \
+    --disable-bluez \
+    --disable-brlapi \
+    --disable-curl \
+    --disable-curses \
+    --disable-docs \
+    --disable-kvm \
+    --disable-spice \
+    --disable-sdl \
+    --disable-vde \
+    --disable-vnc-sasl \
+    --disable-werror \
+    --enable-trace-backend=simple \
+    --disable-stack-protector \
+    --target-list=riscv32-softmmu,riscv64-softmmu
+  $ make
+
+
+Next compile barebox::
+
+  $ make erizo_generic_defconfig ARCH=riscv
+  ...
+  $ make ARCH=riscv CROSS_COMPILE=<path to your riscv toolchain>/riscv32-unknown-elf-
+
+Run barebox::
+
+  $ <path to riscv-qemu source>/riscv32-softmmu/qemu-system-riscv32 \
+      -nographic -M erizo -bios <path to barebox sources >/barebox.bin \
+      -serial stdio -monitor none -trace file=/dev/null
+
+  nmon> q
+  
+  copy loop done
+  restarting...
+  
+  nmon> q
+  Switch to console [cs0]
+  
+  
+  barebox 2017.08.0-00102-g212af75153 #1 Mon Sep 4 20:54:31 MSK 2017
+  
+  
+  Board: generic Erizo SoC board
+  m25p80 m25p128@00: unrecognized JEDEC id bytes: 00,  0,  0
+  m25p80 m25p128@00: probe failed: error 2
+  malloc space: 0x80100000 -> 0x801fffff (size 1 MiB)
+  running /env/bin/init...
+  /env/bin/init not found
+  barebox:/
+
+
+Running RISC-V barebox on DE0-Nano FPGA board
+---------------------------------------------
+
+See https://github.com/open-design/riscv-soc-cores/ for instructions
+on DE0-Nano bitstream generation and loading.
+
+Connect to board's UART with your favorite serial communication software
+(e.g. minicom) and check 'nmon> ' prompt (nmon runs from onchip ROM).
+
+Next close your communication software and use ./scripts/nmon-loader
+to load barebox image into board's DRAM, e.g.
+
+  # ./scripts/nmon-loader barebox.erizo.nmon /dev/ttyUSB1 115200
+
+Wait several munutes for 'nmon> ' prompt.
+
+Next, start barebox from DRAM:
+
+  nmon> g 80000000
+
+You should see one more 'nmon> ' prompt (this nmon runs from DRAM).
+Exit nmon with 'q' command:
+
+  nmon> q
+  Switch to console [cs0]
+  
+  
+  barebox 2017.08.0-00102-g212af75153 #1 Mon Sep 4 20:54:31 MSK 2017
+  
+  
+  Board: generic Erizo SoC board
+  m25p80 m25p128@00: unrecognized JEDEC id bytes: 00,  0,  0
+  m25p80 m25p128@00: probe failed: error 2
+  malloc space: 0x80100000 -> 0x801fffff (size 1 MiB)
+  running /env/bin/init...
+  /env/bin/init not found
+  barebox:/ 
-- 
2.14.1


_______________________________________________
barebox mailing list
barebox@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/barebox

Re: [RFC v4 10/10] Documentation: add RISC-V docs

[Oleksij Rempel]

[-- Attachment #1.1.1: Type: text/plain, Size: 3949 bytes --]

Am 29.09.2017 um 01:12 schrieb Antony Pavlov:
> Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
> ---
>  Documentation/boards/riscv.rst | 110 +++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 110 insertions(+)
> 
> diff --git a/Documentation/boards/riscv.rst b/Documentation/boards/riscv.rst
> new file mode 100644
> index 000000000..912f16786
> --- /dev/null
> +++ b/Documentation/boards/riscv.rst
> @@ -0,0 +1,110 @@
> +RISC-V
> +======
> +
> +At the moment only qemu emulator is supported (see https://github.com/riscv/riscv-isa-sim
> +for details).
> +
> +Running RISC-V barebox on qemu
> +------------------------------
> +
> +Obtain RISC-V GCC/Newlib Toolchain,
> +see https://github.com/riscv/riscv-tools/blob/master/README.md
> +for details. The ``build.sh`` script from ``riscv-tools`` should
> +create toolchain.
> +
> +Next compile qemu emulator::
> +
> +  $ git clone -b 20170824.erizo https://github.com/miet-riscv-workgroup/riscv-qemu
> +  $ cd riscv-qemu
> +  $ cap="no" ./configure \
> +    --extra-cflags="-Wno-maybe-uninitialized" \
> +    --audio-drv-list="" \
> +    --disable-attr \
> +    --disable-blobs \
> +    --disable-bluez \
> +    --disable-brlapi \
> +    --disable-curl \
> +    --disable-curses \
> +    --disable-docs \
> +    --disable-kvm \
> +    --disable-spice \
> +    --disable-sdl \
> +    --disable-vde \
> +    --disable-vnc-sasl \
> +    --disable-werror \
> +    --enable-trace-backend=simple \
> +    --disable-stack-protector \
> +    --target-list=riscv32-softmmu,riscv64-softmmu
> +  $ make
> +
> +
> +Next compile barebox::
> +
> +  $ make erizo_generic_defconfig ARCH=riscv
> +  ...
> +  $ make ARCH=riscv CROSS_COMPILE=<path to your riscv toolchain>/riscv32-unknown-elf-
> +
> +Run barebox::
> +
> +  $ <path to riscv-qemu source>/riscv32-softmmu/qemu-system-riscv32 \
> +      -nographic -M erizo -bios <path to barebox sources >/barebox.bin \
> +      -serial stdio -monitor none -trace file=/dev/null
> +
> +  nmon> q
> +  
> +  copy loop done
> +  restarting...
> +  
> +  nmon> q
> +  Switch to console [cs0]
> +  
> +  
> +  barebox 2017.08.0-00102-g212af75153 #1 Mon Sep 4 20:54:31 MSK 2017
> +  
> +  
> +  Board: generic Erizo SoC board
> +  m25p80 m25p128@00: unrecognized JEDEC id bytes: 00,  0,  0
> +  m25p80 m25p128@00: probe failed: error 2
> +  malloc space: 0x80100000 -> 0x801fffff (size 1 MiB)
> +  running /env/bin/init...
> +  /env/bin/init not found
> +  barebox:/
> +
> +
> +Running RISC-V barebox on DE0-Nano FPGA board
> +---------------------------------------------
> +
> +See https://github.com/open-design/riscv-soc-cores/ for instructions
> +on DE0-Nano bitstream generation and loading.
> +
> +Connect to board's UART with your favorite serial communication software
> +(e.g. minicom) and check 'nmon> ' prompt (nmon runs from onchip ROM).
> +
> +Next close your communication software and use ./scripts/nmon-loader
> +to load barebox image into board's DRAM, e.g.
> +
> +  # ./scripts/nmon-loader barebox.erizo.nmon /dev/ttyUSB1 115200
> +
> +Wait several munutes for 'nmon> ' prompt.
> +
> +Next, start barebox from DRAM:
> +
> +  nmon> g 80000000
> +
> +You should see one more 'nmon> ' prompt (this nmon runs from DRAM).
> +Exit nmon with 'q' command:
> +
> +  nmon> q
> +  Switch to console [cs0]
> +  
> +  
> +  barebox 2017.08.0-00102-g212af75153 #1 Mon Sep 4 20:54:31 MSK 2017
> +  
> +  
> +  Board: generic Erizo SoC board
> +  m25p80 m25p128@00: unrecognized JEDEC id bytes: 00,  0,  0
> +  m25p80 m25p128@00: probe failed: error 2

hmmm... not working example?

> +  malloc space: 0x80100000 -> 0x801fffff (size 1 MiB)
> +  running /env/bin/init...
> +  /env/bin/init not found
> +  barebox:/ 

some parts are missing in defconfig. Barebox shell can display hostname
and so on ;)
-- 
Regards,
Oleksij


[-- Attachment #1.2: OpenPGP digital signature --]
[-- Type: application/pgp-signature, Size: 195 bytes --]

[-- Attachment #2: Type: text/plain, Size: 149 bytes --]

_______________________________________________
barebox mailing list
barebox@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/barebox

Re: [RFC v4 10/10] Documentation: add RISC-V docs

[Antony Pavlov]

On Fri, 29 Sep 2017 14:35:37 +0200
Oleksij Rempel <linux@rempel-privat.de> wrote:

> Am 29.09.2017 um 01:12 schrieb Antony Pavlov:
> > Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
> > ---
> >  Documentation/boards/riscv.rst | 110 +++++++++++++++++++++++++++++++++++++++++
> >  1 file changed, 110 insertions(+)
> > 
> > diff --git a/Documentation/boards/riscv.rst b/Documentation/boards/riscv.rst
> > new file mode 100644
> > index 000000000..912f16786
> > --- /dev/null
> > +++ b/Documentation/boards/riscv.rst
> > @@ -0,0 +1,110 @@
> > +RISC-V
> > +======
> > +
> > +At the moment only qemu emulator is supported (see https://github.com/riscv/riscv-isa-sim
> > +for details).
> > +
> > +Running RISC-V barebox on qemu
> > +------------------------------
> > +
> > +Obtain RISC-V GCC/Newlib Toolchain,
> > +see https://github.com/riscv/riscv-tools/blob/master/README.md
> > +for details. The ``build.sh`` script from ``riscv-tools`` should
> > +create toolchain.
> > +
> > +Next compile qemu emulator::
> > +
> > +  $ git clone -b 20170824.erizo https://github.com/miet-riscv-workgroup/riscv-qemu
> > +  $ cd riscv-qemu
> > +  $ cap="no" ./configure \
> > +    --extra-cflags="-Wno-maybe-uninitialized" \
> > +    --audio-drv-list="" \
> > +    --disable-attr \
> > +    --disable-blobs \
> > +    --disable-bluez \
> > +    --disable-brlapi \
> > +    --disable-curl \
> > +    --disable-curses \
> > +    --disable-docs \
> > +    --disable-kvm \
> > +    --disable-spice \
> > +    --disable-sdl \
> > +    --disable-vde \
> > +    --disable-vnc-sasl \
> > +    --disable-werror \
> > +    --enable-trace-backend=simple \
> > +    --disable-stack-protector \
> > +    --target-list=riscv32-softmmu,riscv64-softmmu
> > +  $ make
> > +
> > +
> > +Next compile barebox::
> > +
> > +  $ make erizo_generic_defconfig ARCH=riscv
> > +  ...
> > +  $ make ARCH=riscv CROSS_COMPILE=<path to your riscv toolchain>/riscv32-unknown-elf-
> > +
> > +Run barebox::
> > +
> > +  $ <path to riscv-qemu source>/riscv32-softmmu/qemu-system-riscv32 \
> > +      -nographic -M erizo -bios <path to barebox sources >/barebox.bin \
> > +      -serial stdio -monitor none -trace file=/dev/null
> > +
> > +  nmon> q
> > +  
> > +  copy loop done
> > +  restarting...
> > +  
> > +  nmon> q
> > +  Switch to console [cs0]
> > +  
> > +  
> > +  barebox 2017.08.0-00102-g212af75153 #1 Mon Sep 4 20:54:31 MSK 2017
> > +  
> > +  
> > +  Board: generic Erizo SoC board
> > +  m25p80 m25p128@00: unrecognized JEDEC id bytes: 00,  0,  0
> > +  m25p80 m25p128@00: probe failed: error 2
> > +  malloc space: 0x80100000 -> 0x801fffff (size 1 MiB)
> > +  running /env/bin/init...
> > +  /env/bin/init not found
> > +  barebox:/
> > +
> > +
> > +Running RISC-V barebox on DE0-Nano FPGA board
> > +---------------------------------------------
> > +
> > +See https://github.com/open-design/riscv-soc-cores/ for instructions
> > +on DE0-Nano bitstream generation and loading.
> > +
> > +Connect to board's UART with your favorite serial communication software
> > +(e.g. minicom) and check 'nmon> ' prompt (nmon runs from onchip ROM).
> > +
> > +Next close your communication software and use ./scripts/nmon-loader
> > +to load barebox image into board's DRAM, e.g.
> > +
> > +  # ./scripts/nmon-loader barebox.erizo.nmon /dev/ttyUSB1 115200
> > +
> > +Wait several munutes for 'nmon> ' prompt.
> > +
> > +Next, start barebox from DRAM:
> > +
> > +  nmon> g 80000000
> > +
> > +You should see one more 'nmon> ' prompt (this nmon runs from DRAM).
> > +Exit nmon with 'q' command:
> > +
> > +  nmon> q
> > +  Switch to console [cs0]
> > +  
> > +  
> > +  barebox 2017.08.0-00102-g212af75153 #1 Mon Sep 4 20:54:31 MSK 2017
> > +  
> > +  
> > +  Board: generic Erizo SoC board
> > +  m25p80 m25p128@00: unrecognized JEDEC id bytes: 00,  0,  0
> > +  m25p80 m25p128@00: probe failed: error 2
> 
> hmmm... not working example?


At the moment I run risc-v barebox on several FPGA boards.
SPI flash chip is absent on some boards.
This log was produced by SPI-flash-chip-less board.

Also SPI flash chip emulation is absent for Erizo qemu board.


> > +  malloc space: 0x80100000 -> 0x801fffff (size 1 MiB)
> > +  running /env/bin/init...
> > +  /env/bin/init not found
> > +  barebox:/ 
> 
> some parts are missing in defconfig. Barebox shell can display hostname
> and so on ;)
> -- 
> Regards,
> Oleksij
> 


-- 
Best regards,
  Antony Pavlov

_______________________________________________
barebox mailing list
barebox@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/barebox