73 lines
1.5 KiB
C
73 lines
1.5 KiB
C
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/*
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* flash_otp_lock.c -- lock area of One-Time-Program data
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*/
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#define PROGRAM_NAME "flash_otp_lock"
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#include <stdio.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <string.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <sys/ioctl.h>
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#include <mtd/mtd-user.h>
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#include "common.h"
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int main(int argc,char *argv[])
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{
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int fd, val, ret, offset, size;
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char *p;
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if (argc != 5 || strcmp(argv[1], "-u")) {
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fprintf(stderr, "Usage: %s -u <device> <offset> <size>\n", PROGRAM_NAME);
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fprintf(stderr, "offset and size must match on OTP region boundaries\n");
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fprintf(stderr, "CAUTION! ONCE LOCKED, OTP REGIONS CAN'T BE UNLOCKED!\n");
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return EINVAL;
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}
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fd = open(argv[2], O_WRONLY);
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if (fd < 0) {
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perror(argv[2]);
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return errno;
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}
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val = MTD_OTP_USER;
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ret = ioctl(fd, OTPSELECT, &val);
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if (ret < 0) {
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perror("OTPSELECT");
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return errno;
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}
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offset = strtoul(argv[3], &p, 0);
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if (argv[3][0] == 0 || *p != 0) {
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fprintf(stderr, "%s: bad offset value\n", PROGRAM_NAME);
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return ERANGE;
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}
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size = strtoul(argv[4], &p, 0);
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if (argv[4][0] == 0 || *p != 0) {
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fprintf(stderr, "%s: bad size value\n", PROGRAM_NAME);
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return ERANGE;
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}
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printf("About to lock OTP user data on %s from 0x%x to 0x%x\n",
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argv[2], offset, offset + size);
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if (prompt("Are you sure?", false)) {
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struct otp_info info;
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info.start = offset;
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info.length = size;
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ret = ioctl(fd, OTPLOCK, &info);
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if (ret < 0) {
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perror("OTPLOCK");
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return errno;
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}
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printf("Done.\n");
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} else {
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printf("Aborted\n");
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}
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return 0;
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}
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