doc: FIT image: clarify usage of "compression" property
Compressed images should have their compression property
set to "none" if U-Boot should leave them compressed.
This is especially the case for compressed ramdisks that
should be uncompressed by the kernel only.
Signed-off-by: Simon Goldschmidt <sgoldschmidt@de.pepperl-fuchs.com>
diff --git a/doc/uImage.FIT/source_file_format.txt b/doc/uImage.FIT/source_file_format.txt
index d2793a1..d701b9b 100644
--- a/doc/uImage.FIT/source_file_format.txt
+++ b/doc/uImage.FIT/source_file_format.txt
@@ -164,7 +164,9 @@
- data : Path to the external file which contains this node's binary data.
- compression : Compression used by included data. Supported compressions
are "gzip" and "bzip2". If no compression is used compression property
- should be set to "none".
+ should be set to "none". If the data is compressed but it should not be
+ uncompressed by U-Boot (e.g. compressed ramdisk), this should also be set
+ to "none".
Conditionally mandatory property:
- os : OS name, mandatory for types "kernel" and "ramdisk". Valid OS names