diff options
| author | Simon Glass <sjg@chromium.org> | 2021-10-21 21:08:46 -0600 |
|---|---|---|
| committer | Tom Rini <trini@konsulko.com> | 2021-11-16 14:35:08 -0500 |
| commit | 86b9c3e4e48ba47ef28781d06b97846aca74bc8e (patch) | |
| tree | bd000f2e8969f1e35a7e245d700d7d9f3d95f301 /include/env_default.h | |
| parent | ea754aa5658f395200a2b9a2573291a03c63bc77 (diff) | |
env: Allow U-Boot scripts to be placed in a .env file
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>
Diffstat (limited to 'include/env_default.h')
| -rw-r--r-- | include/env_default.h | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/include/env_default.h b/include/env_default.h index 23430dc70d..401e84e3d5 100644 --- a/include/env_default.h +++ b/include/env_default.h @@ -10,6 +10,10 @@ #include <env_callback.h> #include <linux/stringify.h> +#ifndef USE_HOSTCC +#include <generated/environment.h> +#endif + #ifdef DEFAULT_ENV_INSTANCE_EMBEDDED env_t embedded_environment __UBOOT_ENV_SECTION__(environment) = { ENV_CRC, /* CRC Sum */ @@ -110,6 +114,13 @@ const char default_environment[] = { #if defined(CONFIG_BOOTCOUNT_BOOTLIMIT) && (CONFIG_BOOTCOUNT_BOOTLIMIT > 0) "bootlimit=" __stringify(CONFIG_BOOTCOUNT_BOOTLIMIT)"\0" #endif +#ifdef CONFIG_EXTRA_ENV_TEXT +# ifdef CONFIG_EXTRA_ENV_SETTINGS +# error "Your board uses a text-file environment, so must not define CONFIG_EXTRA_ENV_SETTINGS" +# endif + /* This is created in the Makefile */ + CONFIG_EXTRA_ENV_TEXT +#endif #ifdef CONFIG_EXTRA_ENV_SETTINGS CONFIG_EXTRA_ENV_SETTINGS #endif |