fit: fdt overlays doc
Signed-off-by: Pantelis Antoniou <pantelis.antoniou@konsulko.com>
Reviewed-by: Łukasz Majewski
Acked-by: Simon Glass <sjg@chromium.org>
diff --git a/doc/uImage.FIT/source_file_format.txt b/doc/uImage.FIT/source_file_format.txt
index 32825ed..6f727a1 100644
--- a/doc/uImage.FIT/source_file_format.txt
+++ b/doc/uImage.FIT/source_file_format.txt
@@ -235,7 +235,7 @@
|- description = "configuration description"
|- kernel = "kernel sub-node unit name"
|- ramdisk = "ramdisk sub-node unit name"
- |- fdt = "fdt sub-node unit-name"
+ |- fdt = "fdt sub-node unit-name" [, "fdt overlay sub-node unit-name", ...]
|- fpga = "fpga sub-node unit-name"
|- loadables = "loadables sub-node unit-name"
@@ -249,7 +249,9 @@
- ramdisk : Unit name of the corresponding ramdisk image (component image
node of a "ramdisk" type).
- fdt : Unit name of the corresponding fdt blob (component image node of a
- "fdt type").
+ "fdt type"). Additional fdt overlay nodes can be supplied which signify
+ that the resulting device tree blob is generated by the first base fdt
+ blob with all subsequent overlays applied.
- setup : Unit name of the corresponding setup binary (used for booting
an x86 kernel). This contains the setup.bin file built by the kernel.
- fpga : Unit name of the corresponding fpga bitstream blob