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doc: FIT image: clarify usage of "compression" property

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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>
This commit is contained in:
Simon Goldschmidt 2018-07-30 12:53:18 +02:00 committed by Tom Rini
parent ea975fe16b
commit fd15a9e256
1 changed files with 3 additions and 1 deletions
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doc/uImage.FIT/source_file_format.txt
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@ -164,7 +164,9 @@ the '/images' node should have the following layout:
- 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