env: Create a location driver for each location
Set up a location driver for each supported environment location. At
present this just points to the global functions and is not used. A
later patch will switch this over to use private functions in each driver.
There are several special cases here in various drivers to handle
peculiarities of certain boards:
1. Some boards define CONFIG_ENV_IS_IN_FAT and CONFIG_SPL_ENV_SUPPORT but
do not actually load the environment in SPL. The env load code was
optimised out before but with the driver, it is not. Therefore a special
case is added to env/fat.c. The correct fix (depending on board testing
might be to disable CONFIG_SPL_ENV_SUPPORT.
2. A similar situations happens with CONFIG_ENV_IS_IN_FLASH. Some boards
do not actually load the environment in SPL, so to reduce code size we
need to drop that code. A similar fix may be possible with these boards,
or it may be possible to adjust the environment CONFIG settings.
Added to the above is that the CONFIG_SPL_ENV_SUPPORT option does not
apply when the environment is in flash.
Obviously the above has been discovered through painful and time-consuming
trial and error. Hopefully board maintainers can take a look and figure
out what is actually needed.
Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/env/ext4.c b/env/ext4.c
index 7bb4ce7..c6a8492 100644
--- a/env/ext4.c
+++ b/env/ext4.c
@@ -127,3 +127,11 @@
err_env_relocate:
set_default_env(NULL);
}
+
+U_BOOT_ENV_LOCATION(ext4) = {
+ .location = ENVL_EXT4,
+ .get_char = env_get_char_spec,
+ .load = env_relocate_spec,
+ .save = env_save_ptr(saveenv),
+ .init = env_init,
+};