[Qemu-devel] [PATCH v3 1/4] hw/arm/boot: load DTB as a ROM image

[Ard Biesheuvel]

In order to make the device tree blob (DTB) available in memory not only at
first boot, but also after system reset, use rom_blob_add_fixed() to install
it into memory.

Reviewed-by: Peter Maydell <address@hidden>
Signed-off-by: Ard Biesheuvel <address@hidden>
---
 hw/arm/boot.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/hw/arm/boot.c b/hw/arm/boot.c
index e32f2f415885..50eca931e1a4 100644
--- a/hw/arm/boot.c
+++ b/hw/arm/boot.c
@@ -396,7 +396,10 @@ static int load_dtb(hwaddr addr, const struct 
arm_boot_info *binfo)
 
     qemu_fdt_dumpdtb(fdt, size);
 
-    cpu_physical_memory_write(addr, fdt, size);
+    /* Put the DTB into the memory map as a ROM image: this will ensure
+     * the DTB is copied again upon reset, even if addr points into RAM.
+     */
+    rom_add_blob_fixed("dtb", fdt, size, addr);
 
     g_free(fdt);
 
-- 
1.8.3.2