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From: Michael Olbrich <m.olbrich@pengutronix.de>
Date: Sat, 10 Sep 2016 17:40:56 +0200
Subject: [PATCH] vexpress: use device tree provided by QEMU if available
Signed-off-by: Michael Olbrich <m.olbrich@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[];
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