mmc-utils: Add command to set the boot bus conditions
This was added because some eMMC devices had the boot bus conditions
set incorrectly causing them to hang on boot.
Signed-off-by: Al Cooper <acooperx@gmail.com>
Signed-off-by: Chris Ball <chris@printf.net>
diff --git a/mmc.c b/mmc.c
index e0667fc..2adf15c 100644
--- a/mmc.c
+++ b/mmc.c
@@ -95,6 +95,14 @@
"Enable the boot partition for the <device>.\nTo receive acknowledgment of boot from the card set <send_ack>\nto 1, else set it to 0.",
NULL
},
+ { do_boot_bus_conditions_set, -4,
+ "bootbus set", "<boot_mode> " "<reset_boot_bus_conditions> " "<boot_bus_width> " "<device>\n"
+ "Set Boot Bus Conditions.\n"
+ "<boot_mode> must be \"single_backward|single_hs|dual\"\n"
+ "<reset_boot_bus_conditions> must be \"x1|retain\"\n"
+ "<boot_bus_width> must be \"x1|x4|x8\"",
+ NULL
+ },
{ do_write_bkops_en, -1,
"bkops enable", "<device>\n"
"Enable the eMMC BKOPS feature on <device>.\nNOTE! This is a one-time programmable (unreversible) change.",
diff --git a/mmc.h b/mmc.h
index a30ce1c..d57cad5 100644
--- a/mmc.h
+++ b/mmc.h
@@ -50,9 +50,10 @@
#define EXT_CSD_PART_SWITCH_TIME 199
#define EXT_CSD_BOOT_CFG 179
#define EXT_CSD_PART_CONFIG 179
+#define EXT_CSD_BOOT_BUS_CONDITIONS 177
#define EXT_CSD_ERASE_GROUP_DEF 175
#define EXT_CSD_BOOT_WP 173
-#define EXT_CSD_WR_REL_SET 167
+#define EXT_CSD_WR_REL_SET 167
#define EXT_CSD_WR_REL_PARAM 166
#define EXT_CSD_SANITIZE_START 165
#define EXT_CSD_BKOPS_EN 163 /* R/W */
diff --git a/mmc_cmds.c b/mmc_cmds.c
index 2471eb0..bf3ff78 100644
--- a/mmc_cmds.c
+++ b/mmc_cmds.c
@@ -303,6 +303,75 @@
return ret;
}
+int do_boot_bus_conditions_set(int nargs, char **argv)
+{
+ __u8 ext_csd[512];
+ __u8 value = 0;
+ int fd, ret;
+ char *device;
+
+ CHECK(nargs != 5, "Usage: mmc: bootbus set <boot_mode> "
+ "<reset_boot_bus_conditions> <boot_bus_width> <device>\n",
+ exit(1));
+
+ if (strcmp(argv[1], "single_backward") == 0)
+ value |= 0;
+ else if (strcmp(argv[1], "single_hs") == 0)
+ value |= 0x8;
+ else if (strcmp(argv[1], "dual") == 0)
+ value |= 0x10;
+ else {
+ fprintf(stderr, "illegal <boot_mode> specified\n");
+ exit(1);
+ }
+
+ if (strcmp(argv[2], "x1") == 0)
+ value |= 0;
+ else if (strcmp(argv[2], "retain") == 0)
+ value |= 0x4;
+ else {
+ fprintf(stderr,
+ "illegal <reset_boot_bus_conditions> specified\n");
+ exit(1);
+ }
+
+ if (strcmp(argv[3], "x1") == 0)
+ value |= 0;
+ else if (strcmp(argv[3], "x4") == 0)
+ value |= 0x1;
+ else if (strcmp(argv[3], "x8") == 0)
+ value |= 0x2;
+ else {
+ fprintf(stderr, "illegal <boot_bus_width> specified\n");
+ exit(1);
+ }
+
+ device = argv[4];
+ fd = open(device, O_RDWR);
+ if (fd < 0) {
+ perror("open");
+ exit(1);
+ }
+
+ ret = read_extcsd(fd, ext_csd);
+ if (ret) {
+ fprintf(stderr, "Could not read EXT_CSD from %s\n", device);
+ exit(1);
+ }
+ printf("Changing ext_csd[BOOT_BUS_CONDITIONS] from 0x%02x to 0x%02x\n",
+ ext_csd[EXT_CSD_BOOT_BUS_CONDITIONS], value);
+
+ ret = write_extcsd_value(fd, EXT_CSD_BOOT_BUS_CONDITIONS, value);
+ if (ret) {
+ fprintf(stderr, "Could not write 0x%02x to "
+ "EXT_CSD[%d] in %s\n",
+ value, EXT_CSD_BOOT_BUS_CONDITIONS, device);
+ exit(1);
+ }
+ close(fd);
+ return ret;
+}
+
int do_hwreset(int value, int nargs, char **argv)
{
__u8 ext_csd[512];
@@ -948,6 +1017,9 @@
ext_csd_rev = ext_csd[192];
switch (ext_csd_rev) {
+ case 7:
+ str = "5.0";
+ break;
case 6:
str = "4.5";
break;
diff --git a/mmc_cmds.h b/mmc_cmds.h
index 6d2a5ed..ab181d4 100644
--- a/mmc_cmds.h
+++ b/mmc_cmds.h
@@ -21,6 +21,7 @@
int do_writeprotect_set(int nargs, char **argv);
int do_disable_512B_emulation(int nargs, char **argv);
int do_write_boot_en(int nargs, char **argv);
+int do_boot_bus_conditions_set(int nargs, char **argv);
int do_write_bkops_en(int nargs, char **argv);
int do_hwreset_en(int nargs, char **argv);
int do_hwreset_dis(int nargs, char **argv);
