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-rw-r--r--doc/uImage.FIT/source_file_format.txt5
1 files changed, 5 insertions, 0 deletions
diff --git a/doc/uImage.FIT/source_file_format.txt b/doc/uImage.FIT/source_file_format.txt
index 18d2aedcb73..884a58456f7 100644
--- a/doc/uImage.FIT/source_file_format.txt
+++ b/doc/uImage.FIT/source_file_format.txt
@@ -304,6 +304,11 @@ 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.
+For FIT image with external data, it would be better to align each blob of data
+to block(512 byte) for block device, so that we don't need to do the copy when
+read the image data in SPL. Pass '-B 0x200' to mkimage to align the FIT
+structure and data to 512 byte, other values available for other align size.
+
9) Examples
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