cmd: mmc: provide boot area protection command
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>
diff --git a/cmd/mmc.c b/cmd/mmc.c
index 6d71208..6142ec8 100644
--- a/cmd/mmc.c
+++ b/cmd/mmc.c
@@ -896,9 +896,30 @@
}
#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 @@
"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"