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_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;