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mtd: add ability to dump a mtd device 

this can be used on nand flashes and will skip bad blocks and run ecc on the
read data before dumping it.

Signed-off-by: John Crispin <blogic@openwrt.org>

SVN-Revision: 43500
lede-17.01
John Crispin 2014-12-02 18:27:49 +00:00
parent 283d7789ee
commit da988d582f
1 changed files with 57 additions and 5 deletions
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58
package/system/mtd/src/mtd.c
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@ -273,6 +273,42 @@ mtd_erase(const char *mtd)
}
static int
mtd_dump(const char *mtd, int size)
{
int ret = 0;
int fd;
if (quiet < 2)
fprintf(stderr, "Dumping %s ...\n", mtd);
fd = mtd_check_open(mtd);
if(fd < 0) {
fprintf(stderr, "Could not open mtd device: %s\n", mtd);
return -1;
}
do {
char buf[256];
int len = (size > sizeof(buf)) ? (sizeof(buf)) : (size);
int rlen = read(fd, buf, len);
if (rlen < 0) {
if (errno == EINTR)
continue;
ret = -1;
goto out;
}
if (!rlen)
break;
write(1, buf, rlen);
} while (size > 0);
out:
close(fd);
return ret;
}
static int
mtd_verify(const char *mtd, char *file)
{
@ -607,7 +643,8 @@ static void usage(void)
" -d <name> directory for jffs2write, defaults to \"tmp\"\n"
" -j <name> integrate <file> into jffs2 data when writing an image\n"
" -s <number> skip the first n bytes when appending data to the jffs2 partiton, defaults to \"0\"\n"
" -p write beginning at partition offset\n");
" -p write beginning at partition offset\n"
" -l <length> the length of data that we want to dump\n");
if (mtd_fixtrx) {
fprintf(stderr,
" -o offset offset of the image header in the partition(for fixtrx)\n");
@ -643,7 +680,7 @@ int main (int argc, char **argv)
int ch, i, boot, imagefd = 0, force, unlocked;
char *erase[MAX_ARGS], *device = NULL;
char *fis_layout = NULL;
size_t offset = 0, part_offset = 0;
size_t offset = 0, part_offset = 0, dump_len = 0;
enum {
CMD_ERASE,
CMD_WRITE,
@ -652,6 +689,7 @@ int main (int argc, char **argv)
CMD_FIXTRX,
CMD_FIXSEAMA,
CMD_VERIFY,
CMD_DUMP,
} cmd = -1;
erase[0] = NULL;
@ -665,7 +703,7 @@ int main (int argc, char **argv)
#ifdef FIS_SUPPORT
"F:"
#endif
"frnqe:d:s:j:p:o:")) != -1)
"frnqe:d:s:j:p:o:l:")) != -1)
switch (ch) {
case 'f':
force = 1;
@ -709,6 +747,14 @@ int main (int argc, char **argv)
usage();
}
break;
case 'l':
errno = 0;
dump_len = strtoul(optarg, 0, 0);
if (errno) {
fprintf(stderr, "-l: illegal numeric string\n");
usage();
}
break;
case 'o':
if (!mtd_fixtrx) {
fprintf(stderr, "-o: is not available on this platform\n");
@ -752,6 +798,9 @@ int main (int argc, char **argv)
cmd = CMD_VERIFY;
imagefile = argv[1];
device = argv[2];
} else if ((strcmp(argv[0], "dump") == 0) && (argc == 2)) {
cmd = CMD_DUMP;
device = argv[1];
} else if ((strcmp(argv[0], "write") == 0) && (argc == 3)) {
cmd = CMD_WRITE;
device = argv[2];
@ -809,6 +858,9 @@ int main (int argc, char **argv)
case CMD_VERIFY:
mtd_verify(device, imagefile);
break;
case CMD_DUMP:
mtd_dump(device, dump_len);
break;
case CMD_ERASE:
if (!unlocked)
mtd_unlock(device);