[RFC 0/4] riscv: add initial LiteX SoC support

[Antony Pavlov <antonynpavlov@gmail.com>]

This RFC patchseries adds initial LiteX RISC-V SoC support for barebox.

You can obtain this patchseries from github:

    $ git clone -b 20190602.litex https://github.com/frantony/barebox

LiteX is a Migen-based System on Chip [1], supporting softcore VexRiscv CPU,
 a 32-bits Linux Capable RISC-V CPU [2].

All the components used to create the LiteX SoC are open-source and
the flexibility of Spinal HDL/Migen allow targeting easily very various
FPGA devices/boards: Lattice, Altera, Xilinx, Microsemi FPGAs
with SDRAM/DDR/DDR2/DDR3/DDR4 RAMs, RMII/MII/RGMII/1000BASE-X Ethernet PHYs.

The LiteX SoC with VexRiscv CPU can be deployed on e.g. Digilent ARTY board [3]
or Terasic DE0-Nano board [4].

You can boot barebox from serial port using flterm [5]:, e.g.:

flterm --port /dev/ttyUSB0 --kernel <path_to_barebox.bin> --kernel-adr 0x40000000


TODO
====

  * add pbl support for riscv barebox;
  * add liteeth Ethernet core support [6] (tip: use ARTY board);
  * fix issues (see the WIP commit);
  * use barebox to start linux [2] and zephyr [7].


REFERENCES
==========

 [1] https://github.com/enjoy-digital/litex
 [2] https://github.com/enjoy-digital/linux-on-litex-vexriscv
 [3] https://store.digilentinc.com/arty-a7-artix-7-fpga-development-board-for-makers-and-hobbyists/
 [4] http://www.terasic.com.tw/cgi-bin/page/archive.pl?Language=English&No=593
 [5] https://github.com/timvideos/flterm
 [6] https://github.com/enjoy-digital/liteeth
 [7] https://github.com/zephyrproject-rtos/zephyr/tree/master/boards/riscv32/litex_vexriscv


Antony Pavlov (4):
  riscv: add initial LiteX SoC support
  serial: add litex UART driver
  WIP: make it work on litex
  riscv: add litex_defconfig

 arch/riscv/Kconfig                            |   6 +
 arch/riscv/Makefile                           |   1 +
 arch/riscv/boot/start.S                       |   2 -
 arch/riscv/configs/litex_defconfig            |  45 +++++++
 arch/riscv/dts/litex-generic.dts              |  17 +++
 arch/riscv/dts/litex.dtsi                     |  36 +++++
 arch/riscv/mach-litex/Kconfig                 |  11 ++
 arch/riscv/mach-litex/Makefile                |   3 +
 arch/riscv/mach-litex/include/mach/debug_ll.h | 124 ++++++++++++++++++
 common/bootm.c                                |   2 +
 drivers/serial/Makefile                       |   1 +
 drivers/serial/serial_litex.c                 |  99 ++++++++++++++
 12 files changed, 345 insertions(+), 2 deletions(-)
 create mode 100644 arch/riscv/configs/litex_defconfig
 create mode 100644 arch/riscv/dts/litex-generic.dts
 create mode 100644 arch/riscv/dts/litex.dtsi
 create mode 100644 arch/riscv/mach-litex/Kconfig
 create mode 100644 arch/riscv/mach-litex/Makefile
 create mode 100644 arch/riscv/mach-litex/include/mach/debug_ll.h
 create mode 100644 drivers/serial/serial_litex.c

-- 
2.20.1


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