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mmc-utils: Add a command to write extcsd registers

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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@sagemcom.com>
[ rebased onto latest master and updated commit message ]
Signed-off-by: Sean Anderson <sean.anderson@seco.com>
Link: https://lore.kernel.org/r/20221216161625.2924013-1-sean.anderson@seco.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Sean Anderson 2022-12-16 11:16:25 -05:00 committed by Ulf Hansson
parent c62dd8e415
commit a08f08ec67
2 changed files with 37 additions and 0 deletions
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5
mmc.c
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@ -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>.",

32
mmc_cmds.c
View File

@ -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;