diff options
Diffstat (limited to 'flash_otp_write.c')
-rw-r--r-- | flash_otp_write.c | 122 |
1 files changed, 0 insertions, 122 deletions
diff --git a/flash_otp_write.c b/flash_otp_write.c deleted file mode 100644 index 111318d..0000000 --- a/flash_otp_write.c +++ /dev/null @@ -1,122 +0,0 @@ -/* - * 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; -} |