From: Tony Dinh Date: Wed, 10 Sep 2025 21:56:03 +0000 (-0700) Subject: doc: ext4fs: update documentation for Ext4 Write configuration X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=6578475a9669ea74b9e9e3df2b275309862cb27f;p=thirdparty%2Fu-boot.git doc: ext4fs: update documentation for Ext4 Write configuration Update documentation for how to configure Ext4 Write when using large partitions. Signed-off-by: Tony Dinh --- diff --git a/doc/README.ext4 b/doc/README.ext4 index 8ecd21eee3b..ca9f19953d2 100644 --- a/doc/README.ext4 +++ b/doc/README.ext4 @@ -40,6 +40,17 @@ Also relevant are the generic filesystem commands, selected by: This does not automatically enable EXT4 support for you, you still need to do that yourself. +Lastly, the current u-boot implementation for Ext4 write requires a lot +of memory to run successfully. The following enable support for +large Ext4 partitions: + + CONFIG_EXT4_MAX_JOURNAL_ENTRIES + CONFIG_SYS_MALLOC_LEN + +The number of journal entries and dynamic memory allocation are proportional +to the partition capacity. For example, an ext4 4TB HDD partition could +require approximately 500 entries and more than 128 MB heap space. + Some sample commands to test ext4 support: 1. Check that the commands can be seen in the output of U-Boot help: