@@ -10,16 +10,18 @@
#include <string.h>
#include <errno.h>
#include <sys/ioctl.h>
+#include <stdlib.h>
#include <mtd/mtd-user.h>
int main(int argc,char *argv[])
{
- int fd, val, i, offset, ret;
+ int fd, val, i, ret;
+ int offset = 0;
unsigned char buf[16];
- if (argc != 3 || (strcmp(argv[1], "-f") && strcmp(argv[1], "-u"))) {
- fprintf(stderr,"Usage: %s [ -f | -u ] <device>\n", PROGRAM_NAME);
+ if (argc <= 3 || (strcmp(argv[1], "-f") && strcmp(argv[1], "-u"))) {
+ fprintf(stderr,"Usage: %s [ -f | -u ] <device> [<offset>]\n", PROGRAM_NAME);
return EINVAL;
}
@@ -36,9 +38,22 @@ int main(int argc,char *argv[])
return errno;
}
+ if (argc >= 4) {
+ char *p;
+ offset = (off_t)strtoull(argv[3], &p, 0);
+ if (argv[3][0] == 0 || *p != 0) {
+ fprintf(stderr, "%s: bad offset value\n", PROGRAM_NAME);
+ return ERANGE;
+ }
+ }
+
+ if (lseek(fd, offset, SEEK_SET) == (off_t)-1) {
+ perror("lseek()");
+ return errno;
+ }
+
printf("OTP %s data for %s\n",
argv[1][1] == 'f' ? "factory" : "user", argv[2]);
- offset = 0;
while ((ret = read(fd, buf, sizeof(buf)))) {
if (ret < 0) {
perror("read()");
There are flashes which have gaps between OTP regions and flashes where the regions don't start at 0 (for example the Winbond 25Q series, which has three 256 bytes OTP regions starting at 0x1000, 0x2000 and 0x3000). At the moment it is impossible to dump the OTP memory. Fix it by passing an optional offset parameter. Signed-off-by: Michael Walle <michael@walle.cc> --- misc-utils/flash_otp_dump.c | 23 +++++++++++++++++++---- 1 file changed, 19 insertions(+), 4 deletions(-)