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env: Create a location driver for each location

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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>
This commit is contained in:
Simon Glass
2017-08-03 12:21:58 -06:00
committed by Tom Rini
parent 42a8180d19
commit 4415f1d1f1
15 changed files with 246 additions and 7 deletions
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12
env/nand.c vendored
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@ -24,7 +24,8 @@
#include <search.h>
#include <errno.h>
#if defined(CONFIG_CMD_SAVEENV) && defined(CONFIG_CMD_NAND)
#if defined(CONFIG_CMD_SAVEENV) && defined(CONFIG_CMD_NAND) && \
!defined(CONFIG_SPL_BUILD)
#define CMD_SAVEENV
#elif defined(CONFIG_ENV_OFFSET_REDUND)
#error CONFIG_ENV_OFFSET_REDUND must have CONFIG_CMD_SAVEENV & CONFIG_CMD_NAND
@ -394,3 +395,12 @@ void env_relocate_spec(void)
#endif /* ! ENV_IS_EMBEDDED */
}
#endif /* CONFIG_ENV_OFFSET_REDUND */
U_BOOT_ENV_LOCATION(nand) = {
.location = ENVL_NAND,
.load = env_relocate_spec,
#if defined(CMD_SAVEENV)
.save = env_save_ptr(saveenv),
#endif
.init = env_init,
};