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openwrt-owl/openwrt/package/mtd/mtd.c

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/*
* mtd - simple memory technology device manipulation tool
*
* Copyright (C) 2005 Waldemar Brodkorb <wbx@dass-it.de>,
* Felix Fietkau <nbd@vd-s.ath.cx>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* $Id$
*
* code is based on linux-mtd example code
*/
#include <limits.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <stdint.h>
#include <fcntl.h>
#include <errno.h>
#include <error.h>
#include <time.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/param.h>
#include <sys/mount.h>
#include <sys/stat.h>
#include <sys/reboot.h>
#include <string.h>
#include <linux/mtd/mtd.h>
#define TRX_MAGIC 0x30524448 /* "HDR0" */
#define BUFSIZE (10 * 1024)
#define MAX_ARGS 8
struct trx_header {
uint32_t magic; /* "HDR0" */
uint32_t len; /* Length of file including header */
uint32_t crc32; /* 32-bit CRC from flag_version to end of file */
uint32_t flag_version; /* 0:15 flags, 16:31 version */
uint32_t offsets[3]; /* Offsets of partitions from start of header */
};
int
trx_check(const char *trxfile, const char *mtd, int force)
{
struct mtd_info_user mtdInfo;
int trxfd, fd;
size_t count;
struct trx_header trx;
struct stat trxstat;
trxfd = open(trxfile,O_RDONLY);
if(trxfd < 0) {
fprintf(stderr, "Could not open image: %s\n", trxfile);
exit(1);
}
if (fstat(trxfd,&trxstat) < 0) {
fprintf(stderr, "Could not get image file status: %s\n", trxfile);
close(trxfd);
exit(1);
}
if (force == 0) {
count = read(trxfd, &trx, sizeof(struct trx_header));
if (count < sizeof(struct trx_header)) {
fprintf(stderr, "Could not get trx header, file too small (%ld bytes)\n", count);
close(trxfd);
exit(1);
}
if (trx.magic != TRX_MAGIC || trx.len < sizeof(struct trx_header)) {
fprintf(stderr, "Bad trx header\n");
fprintf(stderr, "If this is a firmware in bin format, like some of the\n"
"original firmware files are, use following command to convert to trx:\n"
"dd if=firmware.bin of=firmware.trx bs=32 skip=1\n");
close(trxfd);
exit(1);
}
lseek(trxfd, 0, SEEK_SET);
}
/* check if image fits to mtd device */
fd = mtd_open(mtd, O_RDWR);
if(fd < 0) {
fprintf(stderr, "Could not open mtd device: %s\n", mtd);
exit(1);
}
if(ioctl(fd, MEMGETINFO, &mtdInfo)) {
fprintf(stderr, "Could not get MTD device info from %s\n", mtd);
close(fd);
exit(1);
}
if(mtdInfo.size < trxstat.st_size) {
fprintf(stderr, "Image too big for partition: %s\n", mtd);
close(trxfd);
close(fd);
exit(1);
}
printf("Writing %s to %s ...\n", trxfile, mtd);
close(fd);
return(trxfd);
}
int
mtd_unlock(const char *mtd)
{
int fd;
struct mtd_info_user mtdInfo;
struct erase_info_user mtdLockInfo;
fd = mtd_open(mtd, O_RDWR);
if(fd < 0) {
fprintf(stderr, "Could not open mtd device: %s\n", mtd);
exit(1);
}
if(ioctl(fd, MEMGETINFO, &mtdInfo)) {
fprintf(stderr, "Could not get MTD device info from %s\n", mtd);
close(fd);
exit(1);
}
printf("Unlocking %s ...\n", mtd);
mtdLockInfo.start = 0;
mtdLockInfo.length = mtdInfo.size;
if(ioctl(fd, MEMUNLOCK, &mtdLockInfo)) {
close(fd);
return 0;
}
close(fd);
return 0;
}
int
mtd_open(const char *mtd, int flags)
{
FILE *fp;
char dev[PATH_MAX];
int i;
if ((fp = fopen("/proc/mtd", "r"))) {
while (fgets(dev, sizeof(dev), fp)) {
if (sscanf(dev, "mtd%d:", &i) && strstr(dev, mtd)) {
snprintf(dev, sizeof(dev), "/dev/mtd/%d", i);
fclose(fp);
return open(dev, flags);
}
}
fclose(fp);
}
return open(mtd, flags);
}
int
mtd_erase(const char *mtd)
{
int fd;
struct mtd_info_user mtdInfo;
struct erase_info_user mtdEraseInfo;
fd = mtd_open(mtd, O_RDWR);
if(fd < 0) {
fprintf(stderr, "Could not open mtd device: %s\n", mtd);
exit(1);
}
if(ioctl(fd, MEMGETINFO, &mtdInfo)) {
fprintf(stderr, "Could not get MTD device info from %s\n", mtd);
close(fd);
exit(1);
}
printf("Erasing %s ...\n", mtd);
mtdEraseInfo.length = mtdInfo.erasesize;
for (mtdEraseInfo.start = 0;
mtdEraseInfo.start < mtdInfo.size;
mtdEraseInfo.start += mtdInfo.erasesize) {
ioctl(fd, MEMUNLOCK, &mtdEraseInfo);
if(ioctl(fd, MEMERASE, &mtdEraseInfo)) {
fprintf(stderr, "Could not erase MTD device: %s\n", mtd);
close(fd);
exit(1);
}
}
close(fd);
return 0;
}
int
mtd_write(int trxfd, const char *mtd)
{
int fd,i;
size_t result,size,written;
struct mtd_info_user mtdInfo;
struct erase_info_user mtdEraseInfo;
unsigned char src[BUFSIZE],dest[BUFSIZE];
struct stat trxstat;
if (fstat(trxfd,&trxstat) < 0) {
fprintf(stderr, "Could not get trx image file status\n");
close(trxfd);
exit(1);
}
fd = mtd_open(mtd, O_RDWR);
if(fd < 0) {
fprintf(stderr, "Could not open mtd device: %s\n", mtd);
exit(1);
}
if(ioctl(fd, MEMGETINFO, &mtdInfo)) {
fprintf(stderr, "Could not get MTD device info from %s\n", mtd);
close(fd);
exit(1);
}
mtdEraseInfo.start = 0;
mtdEraseInfo.length = trxstat.st_size & ~(mtdInfo.erasesize -1);
if(trxstat.st_size % mtdInfo.erasesize) mtdEraseInfo.length += mtdInfo.erasesize;
/* erase the chunk */
if (ioctl (fd,MEMERASE,&mtdEraseInfo) < 0) {
fprintf(stderr, "Erasing mtd failed: %s\n", mtd);
exit(1);
}
size = trxstat.st_size;
i = BUFSIZE;
written = 0;
while (size) {
if (size < BUFSIZE) i = size;
read(trxfd,src,i);
result = write(fd,src,i);
if (i != result) {
if (result < 0) {
fprintf(stderr,"Error while writing image");
exit(1);
}
fprintf(stderr,"Error writing image");
exit(1);
}
written += i;
size -= i;
}
return 0;
}
void usage(void)
{
printf("Usage: mtd [<options> ...] <command> [<arguments> ...] <device>\n\n"
"The device is in the format of mtdX (eg: mtd4) or its label.\n"
"mtd recognizes these commands:\n"
" unlock unlock the device\n"
" erase erase all data on device\n"
" write <imagefile> write imagefile to device\n"
"Following options are available:\n"
" -r reboot after successful command\n"
" -f force write without trx checks\n"
" -e <device> erase <device> before executing the command\n\n"
"Example: To write linux.trx to mtd4 labeled as linux and reboot afterwards\n"
" mtd -r write linux.trx linux\n\n");
exit(1);
}
int main (int argc, char **argv)
{
int ch, i, boot, unlock, trxfd, force;
char *erase[MAX_ARGS], *device;
enum {
CMD_ERASE,
CMD_WRITE,
CMD_UNLOCK
} cmd;
erase[0] = NULL;
boot = 0;
force = 0;
while ((ch = getopt(argc, argv, "fre:")) != -1)
switch (ch) {
case 'f':
force = 1;
break;
case 'r':
boot = 1;
break;
case 'e':
i = 0;
while ((erase[i] != NULL) && ((i + 1) < MAX_ARGS))
i++;
erase[i++] = optarg;
erase[i] = NULL;
break;
case '?':
default:
usage();
}
argc -= optind;
argv += optind;
if (argc < 2)
usage();
if ((strcmp(argv[0], "unlock") == 0) && (argc == 2)) {
cmd = CMD_UNLOCK;
device = argv[1];
} else if ((strcmp(argv[0], "erase") == 0) && (argc == 2)) {
cmd = CMD_ERASE;
device = argv[1];
} else if ((strcmp(argv[0], "write") == 0) && (argc == 3)) {
cmd = CMD_WRITE;
device = argv[2];
/* check trx file before erasing or writing anything */
trxfd = trx_check(argv[1], device, force);
} else {
usage();
}
sync();
i = 0;
while (erase[i] != NULL) {
mtd_unlock(erase[i]);
mtd_erase(erase[i]);
i++;
}
mtd_unlock(device);
switch (cmd) {
case CMD_UNLOCK:
break;
case CMD_ERASE:
mtd_erase(device);
break;
case CMD_WRITE:
mtd_write(trxfd, device);
break;
}
if (boot)
kill(1, 15); // send SIGTERM to init for reboot
return 0;
}
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