spl: fit: Support both external and embedded data

[oweals/u-boot.git] / doc / uImage.FIT / source_file_format.txt

diff --git a/doc/uImage.FIT/source_file_format.txt b/doc/uImage.FIT/source_file_format.txt
index 136d3d7078eed79a7c4e68109e955974efb8b2c8..32825eda8d571b1d3eca1e100aec394ed0a3ec63 100644 (file)
--- a/doc/uImage.FIT/source_file_format.txt
+++ b/doc/uImage.FIT/source_file_format.txt
@@ -288,6 +288,10 @@ The 'data-offset' property can be substituted with 'data-position', which
 defines an absolute position or address as the offset. This is helpful when
 booting U-Boot proper before performing relocation.
 
+Normal kernel FIT image has data embedded within FIT structure. U-Boot image
+for SPL boot has external data. Existence of 'data-offset' can be used to
+identify which format is used.
+
 9) Examples
 -----------