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arm/boot: Allow boards to modify the FDT blob

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Add a callback hook in arm_boot_info to allow board models to
modify the device tree blob if they need to. (The major expected
use case is to add virtio-mmio nodes for virtio-mmio transports
that exist in QEMU but not in the hardware.)

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 1373977512-28932-7-git-send-email-peter.maydell@linaro.org
This commit is contained in:
Peter Maydell 2013-07-16 13:25:10 +01:00
parent 4b52530be9
commit 3b1cceb8b5
2 changed files with 9 additions and 0 deletions
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5
hw/arm/boot.c
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@ -294,6 +294,11 @@ static int load_dtb(hwaddr addr, const struct arm_boot_info *binfo)
goto fail; goto fail;
} }
} }
if (binfo->modify_dtb) {
binfo->modify_dtb(binfo, fdt);
}
qemu_devtree_dumpdtb(fdt, size); qemu_devtree_dumpdtb(fdt, size);
cpu_physical_memory_write(addr, fdt, size); cpu_physical_memory_write(addr, fdt, size);

4
include/hw/arm/arm.h
View File

@ -55,6 +55,10 @@ struct arm_boot_info {
const struct arm_boot_info *info); const struct arm_boot_info *info);
void (*secondary_cpu_reset_hook)(ARMCPU *cpu, void (*secondary_cpu_reset_hook)(ARMCPU *cpu,
const struct arm_boot_info *info); const struct arm_boot_info *info);
/* if a board needs to be able to modify a device tree provided by
* the user it should implement this hook.
*/
void (*modify_dtb)(const struct arm_boot_info *info, void *fdt);
/* Used internally by arm_boot.c */ /* Used internally by arm_boot.c */
int is_linux; int is_linux;
hwaddr initrd_start; hwaddr initrd_start;