diff options
| author | Simon Glass <sjg@chromium.org> | 2017-08-03 12:21:58 -0600 |
|---|---|---|
| committer | Tom Rini <trini@konsulko.com> | 2017-08-15 08:18:53 -0400 |
| commit | 4415f1d1f1c57d43f6bc8ff156554c2b2da45b52 (patch) | |
| tree | 0fdd6865c364cb7b68af1e9240a997a0fd686880 /env/fat.c | |
| parent | 42a8180d19ad8f45b4639015050bc709caa4f32c (diff) | |
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>
Diffstat (limited to 'env/fat.c')
| -rw-r--r-- | env/fat.c | 30 |
1 files changed, 28 insertions, 2 deletions
@@ -19,6 +19,18 @@ #include <fat.h> #include <mmc.h> +#ifdef CONFIG_SPL_BUILD +/* TODO(sjg@chromium.org): Figure out why this is needed */ +# if !defined(CONFIG_TARGET_AM335X_EVM) || defined(CONFIG_SPL_OS_BOOT) +# define LOADENV +# endif +#else +# define LOADENV +# if defined(CONFIG_CMD_SAVEENV) +# define CMD_SAVEENV +# endif +#endif + char *env_name_spec = "FAT"; env_t *env_ptr; @@ -34,7 +46,7 @@ int env_init(void) return 0; } -#ifdef CONFIG_CMD_SAVEENV +#ifdef CMD_SAVEENV int saveenv(void) { env_t env_new; @@ -72,8 +84,9 @@ int saveenv(void) puts("done\n"); return 0; } -#endif /* CONFIG_CMD_SAVEENV */ +#endif /* CMD_SAVEENV */ +#ifdef LOADENV void env_relocate_spec(void) { ALLOC_CACHE_ALIGN_BUFFER(char, buf, CONFIG_ENV_SIZE); @@ -108,3 +121,16 @@ void env_relocate_spec(void) err_env_relocate: set_default_env(NULL); } +#endif /* LOADENV */ + +U_BOOT_ENV_LOCATION(fat) = { + .location = ENVL_FAT, + .get_char = env_get_char_spec, +#ifdef LOADENV + .load = env_relocate_spec, +#endif +#ifdef CMD_SAVEENV + .save = env_save_ptr(saveenv), +#endif + .init = env_init, +}; |