package/mtd/src/mtd.c

   1 /*
   2  * mtd - simple memory technology device manipulation tool
   3  *
   4  * Copyright (C) 2005      Waldemar Brodkorb <wbx@dass-it.de>,
   5  * Copyright (C) 2005-2009 Felix Fietkau <nbd@openwrt.org>
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License v2
   9  * as published by the Free Software Foundation.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  19  *
  20  *
  21  * The code is based on the linux-mtd examples.
  22  */
  23
  24 #include <limits.h>
  25 #include <unistd.h>
  26 #include <stdlib.h>
  27 #include <stdio.h>
  28 #include <stdint.h>
  29 #include <signal.h>
  30 #include <sys/ioctl.h>
  31 #include <sys/syscall.h>
  32 #include <fcntl.h>
  33 #include <errno.h>
  34 #include <error.h>
  35 #include <time.h>
  36 #include <string.h>
  37 #include <sys/ioctl.h>
  38 #include <sys/types.h>
  39 #include <sys/param.h>
  40 #include <sys/mount.h>
  41 #include <sys/stat.h>
  42 #include <sys/reboot.h>
  43 #include <linux/reboot.h>
  44 #include "mtd-api.h"
  45 #include "fis.h"
  46 #include "mtd.h"
  47 #include "crc32.h"
  48
  49 #define MAX_ARGS 8
  50 #define JFFS2_DEFAULT_DIR       "" /* directory name without /, empty means root dir */
  51
  52 #if __BYTE_ORDER == __BIG_ENDIAN
  53 #define STORE32_LE(X)           ((((X) & 0x000000FF) << 24) | (((X) & 0x0000FF00) << 8) | (((X) & 0x00FF0000) >> 8) | (((X) & 0xFF000000) >> 24))
  54 #elif __BYTE_ORDER == __LITTLE_ENDIAN
  55 #define STORE32_LE(X)           (X)
  56 #else
  57 #error unkown endianness!
  58 #endif
  59
  60 ssize_t pread(int fd, void *buf, size_t count, off_t offset);
  61 ssize_t pwrite(int fd, const void *buf, size_t count, off_t offset);
  62
  63 #define TRX_MAGIC       0x30524448      /* "HDR0" */
  64 struct trx_header {
  65         uint32_t magic;         /* "HDR0" */
  66         uint32_t len;           /* Length of file including header */
  67         uint32_t crc32;         /* 32-bit CRC from flag_version to end of file */
  68         uint32_t flag_version;  /* 0:15 flags, 16:31 version */
  69         uint32_t offsets[3];    /* Offsets of partitions from start of header */
  70 };
  71
  72 static char *buf = NULL;
  73 static char *imagefile = NULL;
  74 static char *jffs2file = NULL, *jffs2dir = JFFS2_DEFAULT_DIR;
  75 static int buflen = 0;
  76 int quiet;
  77 int mtdsize = 0;
  78 int erasesize = 0;
  79
  80 int mtd_open(const char *mtd, bool block)
  81 {
  82         FILE *fp;
  83         char dev[PATH_MAX];
  84         int i;
  85         int ret;
  86         int flags = O_RDWR | O_SYNC;
  87
  88         if ((fp = fopen("/proc/mtd", "r"))) {
  89                 while (fgets(dev, sizeof(dev), fp)) {
  90                         if (sscanf(dev, "mtd%d:", &i) && strstr(dev, mtd)) {
  91                                 snprintf(dev, sizeof(dev), "/dev/mtd%s/%d", (block ? "block" : ""), i);
  92                                 if ((ret=open(dev, flags))<0) {
  93                                         snprintf(dev, sizeof(dev), "/dev/mtd%s%d", (block ? "block" : ""), i);
  94                                         ret=open(dev, flags);
  95                                 }
  96                                 fclose(fp);
  97                                 return ret;
  98                         }
  99                 }
 100                 fclose(fp);
 101         }
 102
 103         return open(mtd, flags);
 104 }
 105
 106 int mtd_check_open(const char *mtd)
 107 {
 108         struct mtd_info_user mtdInfo;
 109         int fd;
 110
 111         fd = mtd_open(mtd, false);
 112         if(fd < 0) {
 113                 fprintf(stderr, "Could not open mtd device: %s\n", mtd);
 114                 return -1;
 115         }
 116
 117         if(ioctl(fd, MEMGETINFO, &mtdInfo)) {
 118                 fprintf(stderr, "Could not get MTD device info from %s\n", mtd);
 119                 close(fd);
 120                 return -1;
 121         }
 122         mtdsize = mtdInfo.size;
 123         erasesize = mtdInfo.erasesize;
 124
 125         return fd;
 126 }
 127
 128 int mtd_erase_block(int fd, int offset)
 129 {
 130         struct erase_info_user mtdEraseInfo;
 131
 132         mtdEraseInfo.start = offset;
 133         mtdEraseInfo.length = erasesize;
 134         ioctl(fd, MEMUNLOCK, &mtdEraseInfo);
 135         if (ioctl (fd, MEMERASE, &mtdEraseInfo) < 0)
 136                 return -1;
 137
 138         return 0;
 139 }
 140
 141 int mtd_write_buffer(int fd, const char *buf, int offset, int length)
 142 {
 143         lseek(fd, offset, SEEK_SET);
 144         write(fd, buf, length);
 145         return 0;
 146 }
 147
 148
 149 static int
 150 image_check(int imagefd, const char *mtd)
 151 {
 152         int ret = 1;
 153 #ifdef target_brcm
 154         ret = trx_check(imagefd, mtd, buf, &buflen);
 155 #endif
 156         return ret;
 157 }
 158
 159 static int mtd_check(const char *mtd)
 160 {
 161         char *next = NULL;
 162         char *str = NULL;
 163         int fd;
 164
 165         if (strchr(mtd, ':')) {
 166                 str = strdup(mtd);
 167                 mtd = str;
 168         }
 169
 170         do {
 171                 next = strchr(mtd, ':');
 172                 if (next) {
 173                         *next = 0;
 174                         next++;
 175                 }
 176
 177                 fd = mtd_check_open(mtd);
 178                 if (fd < 0)
 179                         return 0;
 180
 181                 if (!buf)
 182                         buf = malloc(erasesize);
 183
 184                 close(fd);
 185                 mtd = next;
 186         } while (next);
 187
 188         if (str)
 189                 free(str);
 190
 191         return 1;
 192 }
 193
 194 static int
 195 mtd_unlock(const char *mtd)
 196 {
 197         struct erase_info_user mtdLockInfo;
 198         char *next = NULL;
 199         char *str = NULL;
 200         int fd;
 201
 202         if (strchr(mtd, ':')) {
 203                 str = strdup(mtd);
 204                 mtd = str;
 205         }
 206
 207         do {
 208                 next = strchr(mtd, ':');
 209                 if (next) {
 210                         *next = 0;
 211                         next++;
 212                 }
 213
 214                 fd = mtd_check_open(mtd);
 215                 if(fd < 0) {
 216                         fprintf(stderr, "Could not open mtd device: %s\n", mtd);
 217                         exit(1);
 218                 }
 219
 220                 if (quiet < 2)
 221                         fprintf(stderr, "Unlocking %s ...\n", mtd);
 222
 223                 mtdLockInfo.start = 0;
 224                 mtdLockInfo.length = mtdsize;
 225                 ioctl(fd, MEMUNLOCK, &mtdLockInfo);
 226                 close(fd);
 227                 mtd = next;
 228         } while (next);
 229
 230         if (str)
 231                 free(str);
 232
 233         return 0;
 234 }
 235
 236 static int
 237 mtd_erase(const char *mtd)
 238 {
 239         int fd;
 240         struct erase_info_user mtdEraseInfo;
 241
 242         if (quiet < 2)
 243                 fprintf(stderr, "Erasing %s ...\n", mtd);
 244
 245         fd = mtd_check_open(mtd);
 246         if(fd < 0) {
 247                 fprintf(stderr, "Could not open mtd device: %s\n", mtd);
 248                 exit(1);
 249         }
 250
 251         mtdEraseInfo.length = erasesize;
 252
 253         for (mtdEraseInfo.start = 0;
 254                  mtdEraseInfo.start < mtdsize;
 255                  mtdEraseInfo.start += erasesize) {
 256
 257                 ioctl(fd, MEMUNLOCK, &mtdEraseInfo);
 258                 if(ioctl(fd, MEMERASE, &mtdEraseInfo))
 259                         fprintf(stderr, "Failed to erase block on %s at 0x%x\n", mtd, mtdEraseInfo.start);
 260         }
 261
 262         close(fd);
 263         return 0;
 264
 265 }
 266
 267 static int
 268 mtd_fixtrx(const char *mtd, size_t offset)
 269 {
 270         int fd;
 271         struct trx_header *trx;
 272         char *buf;
 273         ssize_t res;
 274         size_t block_offset;
 275
 276         if (quiet < 2)
 277                 fprintf(stderr, "Trying to fix trx header in %s at 0x%x...\n", mtd, offset);
 278
 279         block_offset = offset & ~(erasesize - 1);
 280         offset -= block_offset;
 281
 282         fd = mtd_check_open(mtd);
 283         if(fd < 0) {
 284                 fprintf(stderr, "Could not open mtd device: %s\n", mtd);
 285                 exit(1);
 286         }
 287
 288         if (block_offset + erasesize > mtdsize) {
 289                 fprintf(stderr, "Offset too large, device size 0x%x\n", mtdsize);
 290                 exit(1);
 291         }
 292
 293         buf = malloc(erasesize);
 294         if (!buf) {
 295                 perror("malloc");
 296                 exit(1);
 297         }
 298
 299         res = pread(fd, buf, erasesize, block_offset);
 300         if (res != erasesize) {
 301                 perror("pread");
 302                 exit(1);
 303         }
 304
 305         trx = (struct trx_header *) (buf + offset);
 306         if (trx->magic != STORE32_LE(0x30524448)) {
 307                 fprintf(stderr, "No trx magic found\n");
 308                 exit(1);
 309         }
 310
 311         if (trx->len == STORE32_LE(erasesize - offset)) {
 312                 if (quiet < 2)
 313                         fprintf(stderr, "Header already fixed, exiting\n");
 314                 close(fd);
 315                 return 0;
 316         }
 317
 318         trx->len = STORE32_LE(erasesize - offset);
 319
 320         trx->crc32 = STORE32_LE(crc32buf((char*) &trx->flag_version, erasesize - offset - 3*4));
 321         if (mtd_erase_block(fd, block_offset)) {
 322                 fprintf(stderr, "Can't erease block at 0x%x (%s)\n", block_offset, strerror(errno));
 323                 exit(1);
 324         }
 325
 326         if (quiet < 2)
 327                 fprintf(stderr, "New crc32: 0x%x, rewriting block\n", trx->crc32);
 328
 329         if (pwrite(fd, buf, erasesize, block_offset) != erasesize) {
 330                 fprintf(stderr, "Error writing block (%s)\n", strerror(errno));
 331                 exit(1);
 332         }
 333
 334         if (quiet < 2)
 335                 fprintf(stderr, "Done.\n");
 336
 337         close (fd);
 338         sync();
 339         return 0;
 340
 341 }
 342
 343 static int
 344 mtd_refresh(const char *mtd)
 345 {
 346         int fd;
 347
 348         if (quiet < 2)
 349                 fprintf(stderr, "Refreshing mtd partition %s ... ", mtd);
 350
 351         fd = mtd_check_open(mtd);
 352         if(fd < 0) {
 353                 fprintf(stderr, "Could not open mtd device: %s\n", mtd);
 354                 exit(1);
 355         }
 356
 357         if (ioctl(fd, MTDREFRESH, NULL)) {
 358                 fprintf(stderr, "Failed to refresh the MTD device\n");
 359                 close(fd);
 360                 exit(1);
 361         }
 362         close(fd);
 363
 364         if (quiet < 2)
 365                 fprintf(stderr, "\n");
 366
 367         return 0;
 368 }
 369
 370 static void
 371 indicate_writing(const char *mtd)
 372 {
 373         if (quiet < 2)
 374                 fprintf(stderr, "\nWriting from %s to %s ... ", imagefile, mtd);
 375
 376         if (!quiet)
 377                 fprintf(stderr, " [ ]");
 378 }
 379
 380 static int
 381 mtd_write(int imagefd, const char *mtd, char *fis_layout)
 382 {
 383         char *next = NULL;
 384         char *str = NULL;
 385         int fd, result;
 386         ssize_t r, w, e;
 387         ssize_t skip = 0;
 388         uint32_t offset = 0;
 389
 390 #ifdef FIS_SUPPORT
 391         static struct fis_part new_parts[MAX_ARGS];
 392         static struct fis_part old_parts[MAX_ARGS];
 393         int n_new = 0, n_old = 0;
 394
 395         if (fis_layout) {
 396                 const char *tmp = mtd;
 397                 char *word, *brkt;
 398                 int ret;
 399
 400                 memset(&old_parts, 0, sizeof(old_parts));
 401                 memset(&new_parts, 0, sizeof(new_parts));
 402
 403                 do {
 404                         next = strchr(tmp, ':');
 405                         if (!next)
 406                                 next = (char *) tmp + strlen(tmp);
 407
 408                         memcpy(old_parts[n_old].name, tmp, next - tmp);
 409
 410                         n_old++;
 411                         tmp = next + 1;
 412                 } while(*next);
 413
 414                 for (word = strtok_r(fis_layout, ",", &brkt);
 415                      word;
 416                          word = strtok_r(NULL, ",", &brkt)) {
 417
 418                         tmp = strtok(word, ":");
 419                         strncpy((char *) new_parts[n_new].name, tmp, sizeof(new_parts[n_new].name) - 1);
 420
 421                         tmp = strtok(NULL, ":");
 422                         if (!tmp)
 423                                 goto next;
 424
 425                         new_parts[n_new].size = strtoul(tmp, NULL, 0);
 426
 427                         tmp = strtok(NULL, ":");
 428                         if (!tmp)
 429                                 goto next;
 430
 431                         new_parts[n_new].loadaddr = strtoul(tmp, NULL, 16);
 432 next:
 433                         n_new++;
 434                 }
 435                 ret = fis_validate(old_parts, n_old, new_parts, n_new);
 436                 if (ret < 0) {
 437                         fprintf(stderr, "Failed to validate the new FIS partition table\n");
 438                         exit(1);
 439                 }
 440                 if (ret == 0)
 441                         fis_layout = NULL;
 442         }
 443 #endif
 444
 445         if (strchr(mtd, ':')) {
 446                 str = strdup(mtd);
 447                 mtd = str;
 448         }
 449
 450         r = 0;
 451
 452 resume:
 453         next = strchr(mtd, ':');
 454         if (next) {
 455                 *next = 0;
 456                 next++;
 457         }
 458
 459         fd = mtd_check_open(mtd);
 460         if(fd < 0) {
 461                 fprintf(stderr, "Could not open mtd device: %s\n", mtd);
 462                 exit(1);
 463         }
 464
 465         indicate_writing(mtd);
 466
 467         w = e = 0;
 468         for (;;) {
 469                 /* buffer may contain data already (from trx check or last mtd partition write attempt) */
 470                 while (buflen < erasesize) {
 471                         r = read(imagefd, buf + buflen, erasesize - buflen);
 472                         if (r < 0) {
 473                                 if ((errno == EINTR) || (errno == EAGAIN))
 474                                         continue;
 475                                 else {
 476                                         perror("read");
 477                                         break;
 478                                 }
 479                         }
 480
 481                         if (r == 0)
 482                                 break;
 483
 484                         buflen += r;
 485                 }
 486
 487                 if (buflen == 0)
 488                         break;
 489
 490                 if (skip > 0) {
 491                         skip -= buflen;
 492                         buflen = 0;
 493                         if (skip <= 0)
 494                                 indicate_writing(mtd);
 495
 496                         continue;
 497                 }
 498
 499                 if (jffs2file) {
 500                         if (memcmp(buf, JFFS2_EOF, sizeof(JFFS2_EOF) - 1) == 0) {
 501                                 if (!quiet)
 502                                         fprintf(stderr, "\b\b\b   ");
 503                                 if (quiet < 2)
 504                                         fprintf(stderr, "\nAppending jffs2 data from %s to %s...", jffs2file, mtd);
 505                                 /* got an EOF marker - this is the place to add some jffs2 data */
 506                                 skip = mtd_replace_jffs2(mtd, fd, e, jffs2file);
 507
 508                                 w += skip;
 509                                 e += skip;
 510                                 skip -= buflen;
 511                                 buflen = 0;
 512                                 offset = 0;
 513                                 continue;
 514                         }
 515                         /* no EOF marker, make sure we figure out the last inode number
 516                          * before appending some data */
 517                         mtd_parse_jffs2data(buf, jffs2dir);
 518                 }
 519
 520                 /* need to erase the next block before writing data to it */
 521                 while (w + buflen > e) {
 522                         if (!quiet)
 523                                 fprintf(stderr, "\b\b\b[e]");
 524
 525
 526                         if (mtd_erase_block(fd, e) < 0) {
 527                                 if (next) {
 528                                         if (w < e) {
 529                                                 write(fd, buf + offset, e - w);
 530                                                 offset = e - w;
 531                                         }
 532                                         w = 0;
 533                                         e = 0;
 534                                         close(fd);
 535                                         mtd = next;
 536                                         fprintf(stderr, "\b\b\b   \n");
 537                                         goto resume;
 538                                 } else {
 539                                         fprintf(stderr, "Failed to erase block\n");
 540                                         exit(1);
 541                                 }
 542                         }
 543
 544                         /* erase the chunk */
 545                         e += erasesize;
 546                 }
 547
 548                 if (!quiet)
 549                         fprintf(stderr, "\b\b\b[w]");
 550
 551                 if ((result = write(fd, buf + offset, buflen)) < buflen) {
 552                         if (result < 0) {
 553                                 fprintf(stderr, "Error writing image.\n");
 554                                 exit(1);
 555                         } else {
 556                                 fprintf(stderr, "Insufficient space.\n");
 557                                 exit(1);
 558                         }
 559                 }
 560                 w += buflen;
 561
 562                 buflen = 0;
 563                 offset = 0;
 564         }
 565
 566         if (!quiet)
 567                 fprintf(stderr, "\b\b\b\b    ");
 568
 569 done:
 570         if (quiet < 2)
 571                 fprintf(stderr, "\n");
 572
 573 #ifdef FIS_SUPPORT
 574         if (fis_layout) {
 575                 if (fis_remap(old_parts, n_old, new_parts, n_new) < 0)
 576                         fprintf(stderr, "Failed to update the FIS partition table\n");
 577         }
 578 #endif
 579
 580         close(fd);
 581         return 0;
 582 }
 583
 584 static void usage(void)
 585 {
 586         fprintf(stderr, "Usage: mtd [<options> ...] <command> [<arguments> ...] <device>[:<device>...]\n\n"
 587         "The device is in the format of mtdX (eg: mtd4) or its label.\n"
 588         "mtd recognizes these commands:\n"
 589         "        unlock                  unlock the device\n"
 590         "        refresh                 refresh mtd partition\n"
 591         "        erase                   erase all data on device\n"
 592         "        write <imagefile>|-     write <imagefile> (use - for stdin) to device\n"
 593         "        jffs2write <file>       append <file> to the jffs2 partition on the device\n"
 594         "        fixtrx                  fix the checksum in a trx header on first boot\n"
 595         "Following options are available:\n"
 596         "        -q                      quiet mode (once: no [w] on writing,\n"
 597         "                                           twice: no status messages)\n"
 598         "        -r                      reboot after successful command\n"
 599         "        -f                      force write without trx checks\n"
 600         "        -e <device>             erase <device> before executing the command\n"
 601         "        -d <name>               directory for jffs2write, defaults to \"tmp\"\n"
 602         "        -j <name>               integrate <file> into jffs2 data when writing an image\n"
 603         "        -o offset               offset of the trx header in the partition (for fixtrx)\n"
 604 #ifdef FIS_SUPPORT
 605         "        -F <part>[:<size>[:<entrypoint>]][,<part>...]\n"
 606         "                                alter the fis partition table to create new partitions replacing\n"
 607         "                                the partitions provided as argument to the write command\n"
 608         "                                (only valid together with the write command)\n"
 609 #endif
 610         "\n"
 611         "Example: To write linux.trx to mtd4 labeled as linux and reboot afterwards\n"
 612         "         mtd -r write linux.trx linux\n\n");
 613         exit(1);
 614 }
 615
 616 static void do_reboot(void)
 617 {
 618         fprintf(stderr, "Rebooting ...\n");
 619         fflush(stderr);
 620
 621         /* try regular reboot method first */
 622         system("/sbin/reboot");
 623         sleep(2);
 624
 625         /* if we're still alive at this point, force the kernel to reboot */
 626         syscall(SYS_reboot,LINUX_REBOOT_MAGIC1,LINUX_REBOOT_MAGIC2,LINUX_REBOOT_CMD_RESTART,NULL);
 627 }
 628
 629 int main (int argc, char **argv)
 630 {
 631         int ch, i, boot, imagefd = 0, force, unlocked;
 632         char *erase[MAX_ARGS], *device = NULL;
 633         char *fis_layout = NULL;
 634         size_t offset = 0;
 635         enum {
 636                 CMD_ERASE,
 637                 CMD_WRITE,
 638                 CMD_UNLOCK,
 639                 CMD_REFRESH,
 640                 CMD_JFFS2WRITE,
 641                 CMD_FIXTRX,
 642         } cmd = -1;
 643
 644         erase[0] = NULL;
 645         boot = 0;
 646         force = 0;
 647         buflen = 0;
 648         quiet = 0;
 649
 650         while ((ch = getopt(argc, argv,
 651 #ifdef FIS_SUPPORT
 652                         "F:"
 653 #endif
 654                         "frqe:d:j:o:")) != -1)
 655                 switch (ch) {
 656                         case 'f':
 657                                 force = 1;
 658                                 break;
 659                         case 'r':
 660                                 boot = 1;
 661                                 break;
 662                         case 'j':
 663                                 jffs2file = optarg;
 664                                 break;
 665                         case 'q':
 666                                 quiet++;
 667                                 break;
 668                         case 'e':
 669                                 i = 0;
 670                                 while ((erase[i] != NULL) && ((i + 1) < MAX_ARGS))
 671                                         i++;
 672
 673                                 erase[i++] = optarg;
 674                                 erase[i] = NULL;
 675                                 break;
 676                         case 'd':
 677                                 jffs2dir = optarg;
 678                                 break;
 679                         case 'o':
 680                                 errno = 0;
 681                                 offset = strtoul(optarg, 0, 0);
 682                                 if (errno) {
 683                                         fprintf(stderr, "-o: illegal numeric string\n");
 684                                         usage();
 685                                 }
 686                                 break;
 687 #ifdef FIS_SUPPORT
 688                         case 'F':
 689                                 fis_layout = optarg;
 690                                 break;
 691 #endif
 692                         case '?':
 693                         default:
 694                                 usage();
 695                 }
 696         argc -= optind;
 697         argv += optind;
 698
 699         if (argc < 2)
 700                 usage();
 701
 702         if ((strcmp(argv[0], "unlock") == 0) && (argc == 2)) {
 703                 cmd = CMD_UNLOCK;
 704                 device = argv[1];
 705         } else if ((strcmp(argv[0], "refresh") == 0) && (argc == 2)) {
 706                 cmd = CMD_REFRESH;
 707                 device = argv[1];
 708         } else if ((strcmp(argv[0], "erase") == 0) && (argc == 2)) {
 709                 cmd = CMD_ERASE;
 710                 device = argv[1];
 711         } else if ((strcmp(argv[0], "fixtrx") == 0) && (argc == 2)) {
 712                 cmd = CMD_FIXTRX;
 713                 device = argv[1];
 714         } else if ((strcmp(argv[0], "write") == 0) && (argc == 3)) {
 715                 cmd = CMD_WRITE;
 716                 device = argv[2];
 717
 718                 if (strcmp(argv[1], "-") == 0) {
 719                         imagefile = "<stdin>";
 720                         imagefd = 0;
 721                 } else {
 722                         imagefile = argv[1];
 723                         if ((imagefd = open(argv[1], O_RDONLY)) < 0) {
 724                                 fprintf(stderr, "Couldn't open image file: %s!\n", imagefile);
 725                                 exit(1);
 726                         }
 727                 }
 728
 729                 if (!mtd_check(device)) {
 730                         fprintf(stderr, "Can't open device for writing!\n");
 731                         exit(1);
 732                 }
 733                 /* check trx file before erasing or writing anything */
 734                 if (!image_check(imagefd, device) && !force) {
 735                         fprintf(stderr, "Image check failed.\n");
 736                         exit(1);
 737                 }
 738         } else if ((strcmp(argv[0], "jffs2write") == 0) && (argc == 3)) {
 739                 cmd = CMD_JFFS2WRITE;
 740                 device = argv[2];
 741
 742                 imagefile = argv[1];
 743                 if (!mtd_check(device)) {
 744                         fprintf(stderr, "Can't open device for writing!\n");
 745                         exit(1);
 746                 }
 747         } else {
 748                 usage();
 749         }
 750
 751         sync();
 752
 753         i = 0;
 754         unlocked = 0;
 755         while (erase[i] != NULL) {
 756                 mtd_unlock(erase[i]);
 757                 mtd_erase(erase[i]);
 758                 if (strcmp(erase[i], device) == 0)
 759                         unlocked = 1;
 760                 i++;
 761         }
 762
 763         switch (cmd) {
 764                 case CMD_UNLOCK:
 765                         if (!unlocked)
 766                                 mtd_unlock(device);
 767                         break;
 768                 case CMD_ERASE:
 769                         if (!unlocked)
 770                                 mtd_unlock(device);
 771                         mtd_erase(device);
 772                         break;
 773                 case CMD_WRITE:
 774                         if (!unlocked)
 775                                 mtd_unlock(device);
 776                         mtd_write(imagefd, device, fis_layout);
 777                         break;
 778                 case CMD_JFFS2WRITE:
 779                         if (!unlocked)
 780                                 mtd_unlock(device);
 781                         mtd_write_jffs2(device, imagefile, jffs2dir);
 782                         break;
 783                 case CMD_REFRESH:
 784                         mtd_refresh(device);
 785                         break;
 786                 case CMD_FIXTRX:
 787                         mtd_fixtrx(device, offset);
 788                         break;
 789         }
 790
 791         sync();
 792
 793         if (boot)
 794                 do_reboot();
 795
 796         return 0;
 797 }