There is a command to read the extcsd and some commands to configure
particular features, but no generic write extcsd command. Such a command
may be useful for not-yet-supported features and manufacturer-specific
registers.
Signed-off-by: Philippe Reynes <philippe.reynes@xxxxxxxxxxxx>
[ rebased onto latest master and updated commit message ]
Signed-off-by: Sean Anderson <sean.anderson@xxxxxxxx>
---
mmc.c | 5 +++++
mmc_cmds.c | 32 ++++++++++++++++++++++++++++++++
2 files changed, 37 insertions(+)
diff --git a/mmc.c b/mmc.c
index adcd814..b9aa478 100644
--- a/mmc.c
+++ b/mmc.c
@@ -58,6 +58,11 @@ static struct Command commands[] = {
"Print extcsd data from <device>.",
NULL
},
+ { do_write_extcsd, 3,
+ "extcsd write", "<offset> <value> <device>\n"
+ "Write <value> at offset <offset> to <device>'s extcsd.",
+ NULL
+ },
{ do_writeprotect_boot_get, -1,
"writeprotect boot get", "<device>\n"
"Print the boot partitions write protect status for <device>.",
diff --git a/mmc_cmds.c b/mmc_cmds.c
index e6d3273..33b9e43 100644
--- a/mmc_cmds.c
+++ b/mmc_cmds.c
@@ -1982,6 +1982,38 @@ out_free:
return ret;
}
+int do_write_extcsd(int nargs, char **argv)
+{
+ int fd, ret;
+ int offset, value;
+ char *device;
+
+ if (nargs != 4) {
+ fprintf(stderr, "Usage: mmc extcsd write <offset> <value> </path/to/mmcblkX>\n");
+ exit(1);
+ }
+
+ offset = strtol(argv[1], NULL, 0);
+ value = strtol(argv[2], NULL, 0);
+ device = argv[3];
+
+ fd = open(device, O_RDWR);
+ if (fd < 0) {
+ perror("open");
+ exit(1);
+ }
+
+ ret = write_extcsd_value(fd, offset, value, 0);
+ if (ret) {
+ fprintf(stderr,
+ "Could not write 0x%02x to EXT_CSD[%d] in %s\n",
+ value, offset, device);
+ exit(1);
+ }
+
+ return ret;
+}
+
int do_sanitize(int nargs, char **argv)
{
int fd, ret;
--
2.35.1.1320.gc452695387.dirty
