boot: add support for fdt_fixup command in environment
The "fdt" command is convenient for making small changes to the OS FDT,
especially during development. This is easy when the kernel and FDT are
loaded separately, but can be cumbersome for FIT images, requiring to
unpack the image, manually apply overlays, etc.
Add an option to execute a command "fdt_fixup" from the environment at
the beginning of image_setup_libfdt() (after overlays are applied, and
before the other fixups).
Signed-off-by: Matthias Schiffer <matthias.schiffer@ew.tq-group.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/boot/Kconfig b/boot/Kconfig
index 987ca73..9f5b8a0 100644
--- a/boot/Kconfig
+++ b/boot/Kconfig
@@ -1514,6 +1514,15 @@
menu "Devicetree fixup"
+config OF_ENV_SETUP
+ bool "Run a command from environment to set up device tree before boot"
+ depends on CMD_FDT
+ help
+ This causes U-Boot to run a command from the environment variable
+ fdt_fixup before booting into the operating system, which can use the
+ fdt command to modify the device tree. The device tree is then passed
+ to the OS.
+
config OF_BOARD_SETUP
bool "Set up board-specific details in device tree before boot"
help