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env: register erase command

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this patch adds basic changes for adding a erase-subcommand to env

with this command the environment stored on non-volatile storage written
by saveenv can be cleared.

Signed-off-by: Frank Wunderlich <frank-w@public-files.de>

squashed fixes
 - start message with "Erasing"
 - mark erase-function as optional
 - env: separate eraseenv from saveenv

Suggested-by: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com>
Reviewed-by: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com>
This commit is contained in:
Frank Wunderlich
2019-06-29 11:36:19 +02:00
committed by Tom Rini
parent 4225f830c5
commit cd121bdb6d
4 changed files with 75 additions and 0 deletions
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8
cmd/Kconfig
View File

@@ -408,6 +408,14 @@ config CMD_SAVEENV
Save all environment variables into the compiled-in persistent
storage.
config CMD_ERASEENV
bool "eraseenv"
default n
depends on CMD_SAVEENV
help
Erase environment variables from the compiled-in persistent
storage.
config CMD_ENV_EXISTS
bool "env exists"
default y

20
cmd/nvedit.c
View File

@@ -767,6 +767,20 @@ U_BOOT_CMD(
"save environment variables to persistent storage",
""
);
#if defined(CONFIG_CMD_ERASEENV)
static int do_env_erase(cmd_tbl_t *cmdtp, int flag, int argc,
char * const argv[])
{
return env_erase() ? 1 : 0;
}
U_BOOT_CMD(
eraseenv, 1, 0, do_env_erase,
"erase environment variables from persistent storage",
""
);
#endif
#endif
#endif /* CONFIG_SPL_BUILD */
@@ -1316,6 +1330,9 @@ static cmd_tbl_t cmd_env_sub[] = {
#endif
#if defined(CONFIG_CMD_SAVEENV) && defined(ENV_IS_IN_DEVICE)
U_BOOT_CMD_MKENT(save, 1, 0, do_env_save, "", ""),
#if defined(CONFIG_CMD_ERASEENV)
U_BOOT_CMD_MKENT(erase, 1, 0, do_env_erase, "", ""),
#endif
#endif
U_BOOT_CMD_MKENT(set, CONFIG_SYS_MAXARGS, 0, do_env_set, "", ""),
#if defined(CONFIG_CMD_ENV_EXISTS)
@@ -1396,6 +1413,9 @@ static char env_help_text[] =
#endif
#if defined(CONFIG_CMD_SAVEENV) && defined(ENV_IS_IN_DEVICE)
"env save - save environment\n"
#if defined(CONFIG_CMD_ERASEENV)
"env erase - erase environment\n"
#endif
#endif
#if defined(CONFIG_CMD_NVEDIT_EFI)
"env set -e name [arg ...] - set UEFI variable; unset if 'arg' not specified\n"