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From: Lucas Stach <l.stach@pengutronix.de>
To: barebox@lists.infradead.org
Subject: [PATCH v2 09/12] vexpress: use device tree provided by QEMU if available
Date: Thu, 12 Oct 2017 12:26:55 +0200	[thread overview]
Message-ID: <20171012102658.17104-9-l.stach@pengutronix.de> (raw)
In-Reply-To: <20171012102658.17104-1-l.stach@pengutronix.de>

From: Michael Olbrich <m.olbrich@pengutronix.de>

Signed-off-by: Michael Olbrich <m.olbrich@pengutronix.de>
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
---
 arch/arm/boards/vexpress/lowlevel.c | 20 ++++++++++++++++++--
 1 file changed, 18 insertions(+), 2 deletions(-)

diff --git a/arch/arm/boards/vexpress/lowlevel.c b/arch/arm/boards/vexpress/lowlevel.c
index 0a226b295c2a..9fe7c836b7b6 100644
--- a/arch/arm/boards/vexpress/lowlevel.c
+++ b/arch/arm/boards/vexpress/lowlevel.c
@@ -9,18 +9,34 @@
 #include <asm/barebox-arm-head.h>
 #include <asm/barebox-arm.h>
 #include <asm/system_info.h>
+#include <asm/unaligned.h>
 #include <linux/amba/sp804.h>
 
 static inline void start_vexpress_common(void *internal_dt)
 {
 	void *fdt = internal_dt - get_runtime_offset();
+	unsigned long membase, memsize = SZ_512M;
 
 	arm_cpu_lowlevel_init();
 
 	if (amba_is_arm_sp804(IOMEM(0x10011000)))
-		barebox_arm_entry(0x60000000, SZ_512M, fdt);
+		membase = 0x60000000;
 	else
-		barebox_arm_entry(0x80000000, SZ_512M, fdt);
+		membase = 0x80000000;
+
+	/* QEMU may put a DTB at the start of RAM */
+	if (IS_ENABLED(CONFIG_OFDEVICE) &&
+	    get_unaligned_be32((void*)membase) == FDT_MAGIC) {
+		fdt = (void*)membase;
+		/*
+		 * Need to move membase a bit as the PBL wants to relocate
+		 * to the start of RAM, which would overwrite the DTB.
+		 */
+		membase += SZ_4M;
+		memsize -= SZ_4M;
+	}
+
+	barebox_arm_entry(membase, memsize, fdt);
 }
 
 extern char __dtb_vexpress_v2p_ca9_start[];
-- 
2.11.0


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  parent reply	other threads:[~2017-10-12 10:27 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-10-12 10:26 [PATCH v2 01/12] ARM: vexpress: always build relocatable image Lucas Stach
2017-10-12 10:26 ` [PATCH v2 02/12] of: populate clock providers before other devices Lucas Stach
2017-10-12 10:26 ` [PATCH v2 03/12] clk: versatile: add basic clocks Lucas Stach
2017-10-12 10:26 ` [PATCH v2 04/12] clocksource: sp804: silently ignore secondary instaces Lucas Stach
2017-10-12 10:26 ` [PATCH v2 05/12] mci: mmci: add DT support Lucas Stach
2017-10-12 10:26 ` [PATCH v2 06/12] ARM: vexpress: switch to DT probe and multi-image build Lucas Stach
2017-10-12 10:26 ` [PATCH v2 07/12] ARM: vexpress: regenerate config Lucas Stach
2017-10-12 10:26 ` [PATCH v2 08/12] docs: add qemu vexpress Lucas Stach
2017-10-12 10:26 ` Lucas Stach [this message]
2017-10-12 10:26 ` [PATCH v2 10/12] vexpress: add bootstate node to the device tree Lucas Stach
2017-10-12 10:26 ` [PATCH v2 11/12] of: base: add function to copy a device tree node Lucas Stach
2017-10-12 10:26 ` [PATCH v2 12/12] ARM: vexpress: add fixup handler for 'virtio, mmio' devices Lucas Stach
2017-10-16  7:31 ` [PATCH v2 01/12] ARM: vexpress: always build relocatable image Sascha Hauer

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