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env: Allow U-Boot scripts to be placed in a .env file

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At present U-Boot environment variables, and thus scripts, are defined
by CONFIG_EXTRA_ENV_SETTINGS. It is painful to add large amounts of text
to this file and dealing with quoting and newlines is harder than it
should be. It would be better if we could just type the script into a
text file and have it included by U-Boot.

Add a feature that brings in a .env file associated with the board
config, if present. To use it, create a file in a board/<vendor>
directory, typically called <board>.env and controlled by the
CONFIG_ENV_SOURCE_FILE option.

The environment variables should be of the form "var=value". Values can
extend to multiple lines. See the README under 'Environment Variables:'
for more information and an example.

In many cases environment variables need access to the U-Boot CONFIG
variables to select different options. Enable this so that the environment
scripts can be as useful as the ones currently in the board config files.
This uses the C preprocessor, means that comments can be included in the
environment using /* ... */

Also support += to allow variables to be appended to. This is needed when
using the preprocessor.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Marek Behún <marek.behun@nic.cz>
Tested-by: Marek Behún <marek.behun@nic.cz>
This commit is contained in:
Simon Glass
2021-10-21 21:08:46 -06:00
committed by Tom Rini
parent ea754aa565
commit 86b9c3e4e4
10 changed files with 372 additions and 2 deletions
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18
env/Kconfig vendored
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@@ -3,6 +3,24 @@ menu "Environment"
config ENV_SUPPORT
def_bool y
config ENV_SOURCE_FILE
string "Environment file to use"
default ""
help
This sets the basename to use to generate the default environment.
This a text file as described in doc/usage/environment.rst
The file must be in the board directory and have a .env extension, so
the resulting filename is typically
board/<vendor>/<board>/<CONFIG_ENV_SOURCE_FILE>.env
If the file is not present, an error is produced.
If this CONFIG is empty, U-Boot uses CONFIG SYS_BOARD as a default, if
the file board/<vendor>/<board>/<SYS_BOARD>.env exists. Otherwise the
environment is assumed to come from the ad-hoc
CONFIG_EXTRA_ENV_SETTINGS #define
config SAVEENV
def_bool y if CMD_SAVEENV