diff options
| -rw-r--r-- | doc/usage/environment.rst | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/doc/usage/environment.rst b/doc/usage/environment.rst index 043c02d9a94..6f3066e2b65 100644 --- a/doc/usage/environment.rst +++ b/doc/usage/environment.rst @@ -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. |