"mmc eraseenv" allows to erase the section on mmc where env is stored
Signed-off-by: Frank Wunderlich frank-w@public-files.de --- cmd/mmc.c | 33 +++++++++++++++++++++++++++++++++ 1 file changed, 33 insertions(+)
diff --git a/cmd/mmc.c b/cmd/mmc.c index 8bc3648193..b8e2c353b4 100644 --- a/cmd/mmc.c +++ b/cmd/mmc.c @@ -441,6 +441,37 @@ static int do_mmc_erase(cmd_tbl_t *cmdtp, int flag,
return (n == cnt) ? CMD_RET_SUCCESS : CMD_RET_FAILURE; } + +static int do_mmc_erase_env(cmd_tbl_t *cmdtp, int flag, + int argc, char * const argv[]) +{ + struct mmc *mmc; + u32 blk, cnt, n; + + if (argc != 1) + return CMD_RET_USAGE; + + mmc = init_mmc_device(curr_device, false); + + if (!mmc) + return CMD_RET_FAILURE; + + blk = CONFIG_ENV_OFFSET / mmc->read_bl_len; + cnt = CONFIG_ENV_SIZE / mmc->read_bl_len; + + printf("\nMMC erase env: dev # %d, block # %d (0x%8x), count %d (0x%8x)", + curr_device, blk, blk * mmc->read_bl_len, + cnt, cnt * mmc->read_bl_len); + + if (mmc_getwp(mmc) == 1) { + printf("Error: card is write protected!\n"); + return CMD_RET_FAILURE; + } + n = blk_derase(mmc_get_blk_desc(mmc), blk, cnt); + printf("%d blocks erased: %s\n", n, (n == cnt) ? "OK" : "ERROR"); + + return (n == cnt) ? CMD_RET_SUCCESS : CMD_RET_FAILURE; +} #endif
static int do_mmc_rescan(cmd_tbl_t *cmdtp, int flag, @@ -878,6 +909,7 @@ static cmd_tbl_t cmd_mmc[] = { #if CONFIG_IS_ENABLED(MMC_WRITE) U_BOOT_CMD_MKENT(write, 4, 0, do_mmc_write, "", ""), U_BOOT_CMD_MKENT(erase, 3, 0, do_mmc_erase, "", ""), + U_BOOT_CMD_MKENT(eraseenv, 1, 0, do_mmc_erase_env, "", ""), #endif #if CONFIG_IS_ENABLED(CMD_MMC_SWRITE) U_BOOT_CMD_MKENT(swrite, 3, 0, do_mmc_sparse_write, "", ""), @@ -940,6 +972,7 @@ U_BOOT_CMD( "mmc swrite addr blk#\n" #endif "mmc erase blk# cnt\n" + "mmc eraseenv - erase environment\n" "mmc rescan\n" "mmc part - lists available partition on current mmc device\n" "mmc dev [dev] [part] - show or set current mmc device [partition]\n" -- 2.17.1