123 lines
2.4 KiB
C
123 lines
2.4 KiB
C
/*
|
|
* flash_otp_write.c -- write One-Time-Program data
|
|
*/
|
|
|
|
#define PROGRAM_NAME "flash_otp_write"
|
|
|
|
#include <stdio.h>
|
|
#include <unistd.h>
|
|
#include <fcntl.h>
|
|
#include <string.h>
|
|
#include <stdlib.h>
|
|
#include <errno.h>
|
|
#include <sys/types.h>
|
|
#include <sys/ioctl.h>
|
|
|
|
#include <common.h>
|
|
#include <mtd/mtd-user.h>
|
|
|
|
ssize_t xread(int fd, void *buf, size_t count)
|
|
{
|
|
ssize_t ret, done = 0;
|
|
|
|
retry:
|
|
ret = read(fd, buf + done, count - done);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
done += ret;
|
|
|
|
if (ret == 0 /* EOF */ || done == count)
|
|
return done;
|
|
else
|
|
goto retry;
|
|
}
|
|
|
|
int main(int argc,char *argv[])
|
|
{
|
|
int fd, val, ret, size, wrote, len;
|
|
mtd_info_t mtdInfo;
|
|
off_t offset;
|
|
char *p, buf[2048];
|
|
|
|
if (argc != 4 || strcmp(argv[1], "-u")) {
|
|
fprintf(stderr, "Usage: %s -u <device> <offset>\n", PROGRAM_NAME);
|
|
fprintf(stderr, "the raw data to write should be provided on stdin\n");
|
|
fprintf(stderr, "CAUTION! ONCE SET TO 0, OTP DATA BITS CAN'T BE ERASED!\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;
|
|
}
|
|
|
|
if (ioctl(fd, MEMGETINFO, &mtdInfo)) {
|
|
perror("MEMGETINFO");
|
|
return errno;
|
|
}
|
|
|
|
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("Writing OTP user data on %s at offset 0x%"PRIxoff_t"\n", argv[2], offset);
|
|
|
|
if (mtd_type_is_nand_user(&mtdInfo))
|
|
len = mtdInfo.writesize;
|
|
else
|
|
len = 256;
|
|
|
|
if (len > sizeof(buf)) {
|
|
printf("huh, writesize (%d) bigger than buffer (%zu)\n",
|
|
len, sizeof(buf));
|
|
return ENOMEM;
|
|
}
|
|
|
|
wrote = 0;
|
|
while ((size = xread(0, buf, len))) {
|
|
if (size < 0) {
|
|
perror("read()");
|
|
return errno;
|
|
}
|
|
p = buf;
|
|
while (size > 0) {
|
|
if (mtd_type_is_nand_user(&mtdInfo)) {
|
|
/* Fill remain buffers with 0xff */
|
|
memset(buf + size, 0xff, mtdInfo.writesize - size);
|
|
size = mtdInfo.writesize;
|
|
}
|
|
ret = write(fd, p, size);
|
|
if (ret < 0) {
|
|
perror("write()");
|
|
return errno;
|
|
}
|
|
if (ret == 0) {
|
|
printf("write() returned 0 after writing %d bytes\n", wrote);
|
|
return 0;
|
|
}
|
|
p += ret;
|
|
wrote += ret;
|
|
size -= ret;
|
|
}
|
|
}
|
|
|
|
printf("Wrote %d bytes of OTP user data\n", wrote);
|
|
return 0;
|
|
}
|