From 3b1cceb8b52320150fd93dc094ba11fd01c6adfa Mon Sep 17 00:00:00 2001 From: Peter Maydell Date: Tue, 16 Jul 2013 13:25:10 +0100 Subject: arm/boot: Allow boards to modify the FDT blob 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 Message-id: 1373977512-28932-7-git-send-email-peter.maydell@linaro.org --- hw/arm/boot.c | 5 +++++ include/hw/arm/arm.h | 4 ++++ 2 files changed, 9 insertions(+) diff --git a/hw/arm/boot.c b/hw/arm/boot.c index 1780316afb..9fbe5d22a5 100644 --- a/hw/arm/boot.c +++ b/hw/arm/boot.c @@ -294,6 +294,11 @@ static int load_dtb(hwaddr addr, const struct arm_boot_info *binfo) goto fail; } } + + if (binfo->modify_dtb) { + binfo->modify_dtb(binfo, fdt); + } + qemu_devtree_dumpdtb(fdt, size); cpu_physical_memory_write(addr, fdt, size); diff --git a/include/hw/arm/arm.h b/include/hw/arm/arm.h index 7b2b02daaf..bae87c6273 100644 --- a/include/hw/arm/arm.h +++ b/include/hw/arm/arm.h @@ -55,6 +55,10 @@ struct arm_boot_info { const struct arm_boot_info *info); void (*secondary_cpu_reset_hook)(ARMCPU *cpu, 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 */ int is_linux; hwaddr initrd_start; -- cgit v1.2.3