From cd121bdb6df3fe8dfe45ff1e34f46f86b8f060c0 Mon Sep 17 00:00:00 2001 From: Frank Wunderlich Date: Sat, 29 Jun 2019 11:36:19 +0200 Subject: [PATCH] env: register erase command 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 squashed fixes - start message with "Erasing" - mark erase-function as optional - env: separate eraseenv from saveenv Suggested-by: Simon Goldschmidt Reviewed-by: Simon Goldschmidt --- cmd/Kconfig | 8 ++++++++ cmd/nvedit.c | 20 ++++++++++++++++++++ env/env.c | 30 ++++++++++++++++++++++++++++++ include/environment.h | 17 +++++++++++++++++ 4 files changed, 75 insertions(+) diff --git a/cmd/Kconfig b/cmd/Kconfig index 67284d8a5f..ec746fe825 100644 --- a/cmd/Kconfig +++ b/cmd/Kconfig @@ -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 diff --git a/cmd/nvedit.c b/cmd/nvedit.c index 7e468ab39d..46b1e60f0a 100644 --- a/cmd/nvedit.c +++ b/cmd/nvedit.c @@ -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" diff --git a/env/env.c b/env/env.c index 4b417b90a2..d3cbe2f915 100644 --- a/env/env.c +++ b/env/env.c @@ -24,6 +24,8 @@ void env_fix_drivers(void) entry->load += gd->reloc_off; if (entry->save) entry->save += gd->reloc_off; + if (entry->erase) + entry->erase += gd->reloc_off; if (entry->init) entry->init += gd->reloc_off; } @@ -254,6 +256,34 @@ int env_save(void) return -ENODEV; } +int env_erase(void) +{ + struct env_driver *drv; + + drv = env_driver_lookup(ENVOP_ERASE, gd->env_load_prio); + if (drv) { + int ret; + + if (!drv->erase) + return -ENODEV; + + if (!env_has_inited(drv->location)) + return -ENODEV; + + printf("Erasing Environment on %s... ", drv->name); + ret = drv->erase(); + if (ret) + printf("Failed (%d)\n", ret); + else + printf("OK\n"); + + if (!ret) + return 0; + } + + return -ENODEV; +} + int env_init(void) { struct env_driver *drv; diff --git a/include/environment.h b/include/environment.h index cd96676141..de67cf4f0e 100644 --- a/include/environment.h +++ b/include/environment.h @@ -200,6 +200,7 @@ enum env_operation { ENVOP_INIT, /* we want to call the init function */ ENVOP_LOAD, /* we want to call the load function */ ENVOP_SAVE, /* we want to call the save function */ + ENVOP_ERASE, /* we want to call the erase function */ }; struct env_driver { @@ -225,6 +226,15 @@ struct env_driver { */ int (*save)(void); + /** + * erase() - Erase the environment on storage + * + * This method is optional and required for 'eraseenv' to work. + * + * @return 0 if OK, -ve on error + */ + int (*erase)(void); + /** * init() - Set up the initial pre-relocation environment * @@ -303,6 +313,13 @@ int env_load(void); */ int env_save(void); +/** + * env_erase() - Erase the environment on storage + * + * @return 0 if OK, -ve on error + */ +int env_erase(void); + /** * env_fix_drivers() - Updates envdriver as per relocation */ -- 2.39.5