1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
|
/*
* flash_otp_lock.c -- lock area of One-Time-Program data
*/
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include <sys/ioctl.h>
#include <mtd/mtd-user.h>
int main(int argc,char *argv[])
{
int fd, val, ret, offset, size;
char *p, buf[8];
if (argc != 5 || strcmp(argv[1], "-u")) {
fprintf(stderr, "Usage: %s -u <device> <offset> <size>\n", argv[0]);
fprintf(stderr, "offset and size must match on OTP region boundaries\n");
fprintf(stderr, "CAUTION! ONCE LOCKED, OTP REGIONS CAN'T BE UNLOCKED!\n");
return EINVAL;
}
fd = open(argv[2], O_WRONLY);
if (fd < 0) {
perror(argv[2]);
return errno;
}
val = MTD_OTP_USER;
ret = ioctl(fd, OTPSELECT, &val);
if (ret < 0) {
perror("OTPSELECT");
return errno;
}
offset = strtoul(argv[3], &p, 0);
if (argv[3][0] == 0 || *p != 0) {
fprintf(stderr, "%s: bad offset value\n", argv[0]);
return ERANGE;
}
size = strtoul(argv[4], &p, 0);
if (argv[4][0] == 0 || *p != 0) {
fprintf(stderr, "%s: bad size value\n", argv[0]);
return ERANGE;
}
printf("About to lock OTP user data on %s from 0x%x to 0x%x\n",
argv[2], offset, offset + size);
printf("Are you sure (yes|no)? ");
if (fgets(buf, sizeof(buf), stdin) && strcmp(buf, "yes\n") == 0) {
struct otp_info info;
info.start = offset;
info.length = size;
ret = ioctl(fd, OTPLOCK, &info);
if (ret < 0) {
perror("OTPLOCK");
return errno;
}
printf("Done.\n");
} else {
printf("Aborted\n");
}
return 0;
}
|
