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authorJohn Crispin <john@openwrt.org>2014-12-02 18:27:49 +0000
committerJohn Crispin <john@openwrt.org>2014-12-02 18:27:49 +0000
commitda988d582f30879381debf9e9ddf1f8cd646c3a3 (patch)
tree4cc6a85a33eb6519f18112cf71ad2a63c7e975ba /package
parent283d7789eea8cb57e31bc6a06d47c5813ebba283 (diff)
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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
Diffstat (limited to 'package')
-rw-r--r--package/system/mtd/src/mtd.c62
1 files changed, 57 insertions, 5 deletions
diff --git a/package/system/mtd/src/mtd.c b/package/system/mtd/src/mtd.c
index ae0d032168..e0a90f6719 100644
--- a/package/system/mtd/src/mtd.c
+++ b/package/system/mtd/src/mtd.c
@@ -274,6 +274,42 @@ 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)
{
uint32_t f_md5[4], m_md5[4];
@@ -596,7 +632,7 @@ static void usage(void)
fprintf(stderr,
" fixseama fix the checksum in a seama header on first boot\n");
}
- fprintf(stderr,
+ fprintf(stderr,
"Following options are available:\n"
" -q quiet mode (once: no [w] on writing,\n"
" twice: no status messages)\n"
@@ -607,11 +643,12 @@ 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");
- }
+ }
fprintf(stderr,
#ifdef FIS_SUPPORT
" -F <part>[:<size>[:<entrypoint>]][,<part>...]\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);