2 * mtd - simple memory technology device manipulation tool
4 * Copyright (C) 2005 Waldemar Brodkorb <wbx@dass-it.de>,
5 * Felix Fietkau <nbd@vd-s.ath.cx>
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version 2
10 * of the License, or (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
33 #include <sys/ioctl.h>
34 #include <sys/types.h>
35 #include <sys/param.h>
36 #include <sys/mount.h>
38 #include <sys/reboot.h>
41 #include <linux/mtd/mtd.h>
44 #define TRX_MAGIC 0x30524448 /* "HDR0" */
46 #define TRX_MAX_LEN 0x3A0000
47 #define TRX_NO_HEADER 1 /* Do not write TRX header */
52 uint32_t magic; /* "HDR0" */
53 uint32_t len; /* Length of file including header */
54 uint32_t crc32; /* 32-bit CRC from flag_version to end of file */
55 uint32_t flag_version; /* 0:15 flags, 16:31 version */
56 uint32_t offsets[3]; /* Offsets of partitions from start of header */
59 #define BUFSIZE (10 * 1024)
63 mtd_unlock(const char *mtd)
66 struct mtd_info_user mtdInfo;
67 struct erase_info_user mtdLockInfo;
69 fd = mtd_open(mtd, O_RDWR);
71 fprintf(stderr, "Could not open mtd device: %s\n", mtd);
75 if(ioctl(fd, MEMGETINFO, &mtdInfo)) {
76 fprintf(stderr, "Could not get MTD device info from %s\n", mtd);
81 printf("Unlocking %s ...\n", mtd);
82 mtdLockInfo.start = 0;
83 mtdLockInfo.length = mtdInfo.size;
84 if(ioctl(fd, MEMUNLOCK, &mtdLockInfo)) {
85 fprintf(stderr, "Could not unlock MTD device: %s\n", mtd);
95 mtd_open(const char *mtd, int flags)
101 if ((fp = fopen("/proc/mtd", "r"))) {
102 while (fgets(dev, sizeof(dev), fp)) {
103 if (sscanf(dev, "mtd%d:", &i) && strstr(dev, mtd)) {
104 snprintf(dev, sizeof(dev), "/dev/mtd/%d", i);
106 return open(dev, flags);
112 return open(mtd, flags);
116 mtd_erase(const char *mtd)
119 struct mtd_info_user mtdInfo;
120 struct erase_info_user mtdEraseInfo;
122 fd = mtd_open(mtd, O_RDWR);
124 fprintf(stderr, "Could not open mtd device: %s\n", mtd);
128 if(ioctl(fd, MEMGETINFO, &mtdInfo)) {
129 fprintf(stderr, "Could not get MTD device info from %s\n", mtd);
134 printf("Erasing %s ...\n", mtd);
135 mtdEraseInfo.length = mtdInfo.erasesize;
137 for (mtdEraseInfo.start = 0;
138 mtdEraseInfo.start < mtdInfo.size;
139 mtdEraseInfo.start += mtdInfo.erasesize) {
141 ioctl(fd, MEMUNLOCK, &mtdEraseInfo);
142 if(ioctl(fd, MEMERASE, &mtdEraseInfo)) {
143 fprintf(stderr, "Could not erase MTD device: %s\n", mtd);
155 mtd_write(const char *trxfile, const char *mtd)
160 size_t result,size,written;
161 struct mtd_info_user mtdInfo;
162 struct erase_info_user mtdEraseInfo;
164 unsigned char src[BUFSIZE],dest[BUFSIZE];
166 fd = mtd_open(mtd, O_RDWR);
168 fprintf(stderr, "Could not open mtd device: %s\n", mtd);
172 if(ioctl(fd, MEMGETINFO, &mtdInfo)) {
173 fprintf(stderr, "Could not get MTD device info from %s\n", mtd);
178 trxfd = open(trxfile,O_RDONLY);
180 fprintf(stderr, "Could not open trx image: %s\n", trxfile);
184 if (fstat (trxfd,&trxstat) < 0) {
185 fprintf(stderr, "Could not get trx image file status: %s\n", trxfile);
190 if(mtdInfo.size < trxstat.st_size) {
191 fprintf(stderr, "Image too big for partition: %s\n", mtd);
196 printf("Writing %s to %s ...\n", trxfile, mtd);
198 mtdEraseInfo.start = 0;
199 mtdEraseInfo.length = trxstat.st_size & ~(mtdInfo.erasesize -1);
200 if(trxstat.st_size % mtdInfo.erasesize) mtdEraseInfo.length += mtdInfo.erasesize;
202 /* erase the chunk */
203 if (ioctl (fd,MEMERASE,&mtdEraseInfo) < 0) {
204 fprintf(stderr, "Erasing mtd failed: %s\n", mtd);
208 size = trxstat.st_size;
213 if (size < BUFSIZE) i = size;
215 result = write(fd,src,i);
218 fprintf(stderr,"Error while writing image");
221 fprintf(stderr,"Error writing image");
233 printf("Usage: mtd [<options> ...] <command> [<arguments> ...] <device>\n\n"
234 "The device is in the format of mtdX (eg: mtd4) or its label.\n"
235 "mtd recognizes these commands:\n"
236 " unlock unlock the device\n"
237 " erase erase all data on device\n"
238 " write <imagefile> write imagefile to device\n"
239 "Following options are available:\n"
240 " -u unlock device before accessing it\n"
241 " -r reboot after successful command\n"
242 " -e <device> erase <device> before executing the command\n\n"
243 "Example: To write linux.trx to mtd4 labeled as linux and reboot afterwards\n"
244 " mtd -r write linux.trx linux\n\n");
248 int main (int argc, char **argv)
250 int ch, i, boot, unlock;
251 char *erase[MAX_ARGS], *device;
262 printf("mtd: Modify data within a Memory Technology Device.\n"
263 "Copyright (C) 2005 Waldemar Brodkorb <wbx@dass-it.de>,\n"
264 " Felix Fietkau <nbd@vd-s.ath.cx>\n"
265 "Documented by Mike Strates [dumpedcore] <mike@dilaudid.net>\n"
266 "mtd has ABSOLUTELY NO WARRANTY and is licensed under the GNU GPL.\n\n");
268 while ((ch = getopt(argc, argv, "ure:")) != -1)
278 while ((erase[i] != NULL) && ((i + 1) < MAX_ARGS))
295 if ((strcmp(argv[0], "unlock") == 0) && (argc == 2)) {
298 } else if ((strcmp(argv[0], "erase") == 0) && (argc == 2)) {
301 } else if ((strcmp(argv[0], "write") == 0) && (argc == 3)) {
311 while (erase[i] != NULL) {
312 mtd_unlock(erase[i]);
328 mtd_write(argv[1], device);