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cmd: mmc: provide boot area protection command

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Provide command 'mmc wp' to power on write protect boot areas on eMMC
devices.

The B_PWR_WP_EN bit in the extended CSD register BOOT_WP is set. The boot
area are write protected until the next power cycle occurs.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
This commit is contained in:
Heinrich Schuchardt
2020-03-30 07:24:19 +02:00
committed by Peng Fan
parent d5210e4589
commit 0469d84636
3 changed files with 36 additions and 0 deletions
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22
cmd/mmc.c
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@@ -896,9 +896,30 @@ static int do_mmc_bkops_enable(cmd_tbl_t *cmdtp, int flag,
}
#endif
static int do_mmc_boot_wp(cmd_tbl_t *cmdtp, int flag,
int argc, char * const argv[])
{
int err;
struct mmc *mmc;
mmc = init_mmc_device(curr_device, false);
if (!mmc)
return CMD_RET_FAILURE;
if (IS_SD(mmc)) {
printf("It is not an eMMC device\n");
return CMD_RET_FAILURE;
}
err = mmc_boot_wp(mmc);
if (err)
return CMD_RET_FAILURE;
printf("boot areas protected\n");
return CMD_RET_SUCCESS;
}
static cmd_tbl_t cmd_mmc[] = {
U_BOOT_CMD_MKENT(info, 1, 0, do_mmcinfo, "", ""),
U_BOOT_CMD_MKENT(read, 4, 1, do_mmc_read, "", ""),
U_BOOT_CMD_MKENT(wp, 1, 0, do_mmc_boot_wp, "", ""),
#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, "", ""),
@@ -968,6 +989,7 @@ U_BOOT_CMD(
"mmc part - lists available partition on current mmc device\n"
"mmc dev [dev] [part] - show or set current mmc device [partition]\n"
"mmc list - lists available devices\n"
"mmc wp - power on write protect booot partitions\n"
#if CONFIG_IS_ENABLED(MMC_HW_PARTITIONING)
"mmc hwpartition [args...] - does hardware partitioning\n"
" arguments (sizes in 512-byte blocks):\n"