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doc: Mention CONFIG_DEFAULT_ENV_FILE

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Add mention of this option since it does a similar thing to the text
environment.

Signed-off-by: Simon Glass <sjg@chromium.org>
Suggested-by: Rasmus Villemoes <rasmus.villemoes@prevas.dk>
Reviewed-by: Marek Behún <marek.behun@nic.cz>
This commit is contained in:
Simon Glass 2021-10-21 21:08:48 -06:00 committed by Tom Rini
parent f501bb4c2a
commit 1df02d1d01
1 changed files with 15 additions and 0 deletions
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15
doc/usage/environment.rst
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@ -458,3 +458,18 @@ The signature of the callback functions is::
include/search.h
The return value is 0 if the variable change is accepted and 1 otherwise.
External environment file
-------------------------
The `CONFIG_USE_DEFAULT_ENV_FILE` option provides a way to bypass the
environment generation in U-Boot. If enabled, then `CONFIG_DEFAULT_ENV_FILE`
provides the name of a file which is converted into the environment,
completely bypassing the standard environment variables in `env_default.h`.
The format is the same as accepted by the mkenvimage tool, with lines containing
key=value pairs. Blank lines and lines beginning with # are ignored.
Future work may unify this feature with the text-based environment, perhaps
moving the contents of `env_default.h` to a text file.