board/karo/tx28/flash.c

   1 #include <common.h>
   2 #include <malloc.h>
   3 #include <nand.h>
   4
   5 #include <linux/err.h>
   6
   7 #include <asm/io.h>
   8 #include <asm/sizes.h>
   9 #include <asm/errno.h>
  10 #include <asm/arch/mxs_gpmi-regs.h>
  11 #include <asm/arch/mxs_gpmi-bch-regs.h>
  12
  13 #define FCB_START_BLOCK         0
  14 #define NUM_FCB_BLOCKS          1
  15 #define MAX_FCB_BLOCKS          32768
  16
  17 struct mx28_nand_timing {
  18         u8 data_setup;
  19         u8 data_hold;
  20         u8 address_setup;
  21         u8 dsample_time;
  22         u8 nand_timing_state;
  23         u8 tREA;
  24         u8 tRLOH;
  25         u8 tRHOH;
  26 };
  27
  28 struct mx28_fcb {
  29         u32 checksum;
  30         u32 fingerprint;
  31         u32 version;
  32         struct mx28_nand_timing timing;
  33         u32 page_data_size;
  34         u32 total_page_size;
  35         u32 sectors_per_block;
  36         u32 number_of_nands;    /* not used by ROM code */
  37         u32 total_internal_die; /* not used by ROM code */
  38         u32 cell_type;          /* not used by ROM code */
  39         u32 ecc_blockn_type;
  40         u32 ecc_block0_size;
  41         u32 ecc_blockn_size;
  42         u32 ecc_block0_type;
  43         u32 metadata_size;
  44         u32 ecc_blocks_per_page;
  45         u32 rsrvd[6];            /* not used by ROM code */
  46         u32 bch_mode;
  47         u32 boot_patch;
  48         u32 patch_sectors;
  49         u32 fw1_start_page;
  50         u32 fw2_start_page;
  51         u32 fw1_sectors;
  52         u32 fw2_sectors;
  53         u32 dbbt_search_area;
  54         u32 bb_mark_byte;
  55         u32 bb_mark_startbit;
  56         u32 bb_mark_phys_offset;
  57 };
  58
  59 struct mx28_dbbt_header {
  60         u32 checksum;
  61         u32 fingerprint;
  62         u32 version;
  63         u32 number_bb;
  64         u32 number_pages;
  65         u8 spare[492];
  66 };
  67
  68 struct mx28_dbbt {
  69         u32 nand_number;
  70         u32 number_bb;
  71         u32 bb_num[2040 / 4];
  72 };
  73
  74 #define BF_VAL(v, bf)           (((v) & BM_##bf) >> BP_##bf)
  75
  76 static nand_info_t *mtd = &nand_info[0];
  77
  78 extern void *_start;
  79
  80 #define BIT(v,n)        (((v) >> (n)) & 0x1)
  81
  82 static u8 calculate_parity_13_8(u8 d)
  83 {
  84         u8 p = 0;
  85
  86         p |= (BIT(d, 6) ^ BIT(d, 5) ^ BIT(d, 3) ^ BIT(d, 2))             << 0;
  87         p |= (BIT(d, 7) ^ BIT(d, 5) ^ BIT(d, 4) ^ BIT(d, 2) ^ BIT(d, 1)) << 1;
  88         p |= (BIT(d, 7) ^ BIT(d, 6) ^ BIT(d, 5) ^ BIT(d, 1) ^ BIT(d, 0)) << 2;
  89         p |= (BIT(d, 7) ^ BIT(d, 4) ^ BIT(d, 3) ^ BIT(d, 0))             << 3;
  90         p |= (BIT(d, 6) ^ BIT(d, 4) ^ BIT(d, 3) ^ BIT(d, 2) ^ BIT(d, 1) ^ BIT(d, 0)) << 4;
  91         return p;
  92 }
  93
  94 static void encode_hamming_13_8(void *_src, void *_ecc, size_t size)
  95 {
  96         int i;
  97         u8 *src = _src;
  98         u8 *ecc = _ecc;
  99
 100         for (i = 0; i < size; i++)
 101                 ecc[i] = calculate_parity_13_8(src[i]);
 102 }
 103
 104 static u32 calc_chksum(void *buf, size_t size)
 105 {
 106         u32 chksum;
 107         u8 *bp = buf;
 108         size_t i;
 109
 110         for (i = 0; i < size; i++) {
 111                 chksum += bp[i];
 112         }
 113         return ~chksum;
 114 }
 115
 116 /*
 117   Physical organisation of data in NAND flash:
 118   metadata
 119   payload chunk 0 (may be empty)
 120   ecc for metadata + payload chunk 0
 121   payload chunk 1
 122   ecc for payload chunk 1
 123 ...
 124   payload chunk n
 125   ecc for payload chunk n
 126  */
 127
 128 static int calc_bb_offset(nand_info_t *mtd, struct mx28_fcb *fcb)
 129 {
 130         int bb_mark_offset;
 131         int chunk_data_size = fcb->ecc_blockn_size * 8;
 132         int chunk_ecc_size = (fcb->ecc_blockn_type << 1) * 13;
 133         int chunk_total_size = chunk_data_size + chunk_ecc_size;
 134         int bb_mark_chunk, bb_mark_chunk_offs;
 135
 136         bb_mark_offset = (mtd->writesize - fcb->metadata_size) * 8;
 137         if (fcb->ecc_block0_size == 0)
 138                 bb_mark_offset -= (fcb->ecc_block0_type << 1) * 13;
 139
 140         bb_mark_chunk = bb_mark_offset / chunk_total_size;
 141         bb_mark_chunk_offs = bb_mark_offset - (bb_mark_chunk * chunk_total_size);
 142         if (bb_mark_chunk_offs > chunk_data_size) {
 143                 printf("Unsupported ECC layout; BB mark resides in ECC data: %u\n",
 144                         bb_mark_chunk_offs);
 145                 return -EINVAL;
 146         }
 147         bb_mark_offset -= bb_mark_chunk * chunk_ecc_size;
 148         return bb_mark_offset;
 149 }
 150
 151 static struct mx28_fcb *create_fcb(void *buf, int fw1_start_block, int fw2_start_block,
 152                                 size_t fw_size)
 153 {
 154         volatile void *gpmi_base = __ioremap(GPMI_BASE_ADDR, SZ_4K, 1);
 155         volatile void *bch_base = __ioremap(BCH_BASE_ADDR, SZ_4K, 1);
 156         u32 fl0, fl1;
 157         u32 t0, t1;
 158         int metadata_size;
 159         int bb_mark_bit_offs;
 160         struct mx28_fcb *fcb;
 161         int fcb_offs;
 162
 163         if (gpmi_base == NULL || bch_base == NULL) {
 164                 return ERR_PTR(-ENOMEM);
 165         }
 166
 167         fl0 = readl(bch_base + HW_BCH_FLASH0LAYOUT0);
 168         fl1 = readl(bch_base + HW_BCH_FLASH0LAYOUT1);
 169         t0 = readl(gpmi_base + HW_GPMI_TIMING0);
 170         t1 = readl(gpmi_base + HW_GPMI_TIMING1);
 171
 172         metadata_size = BF_VAL(fl0, BCH_FLASH0LAYOUT0_META_SIZE);
 173
 174         fcb = buf + ALIGN(metadata_size, 4);
 175         fcb_offs = (void *)fcb - buf;
 176
 177         memset(buf, 0xff, fcb_offs);
 178         memset(fcb, 0x00, sizeof(*fcb));
 179         memset(fcb + 1, 0xff, mtd->erasesize - fcb_offs - sizeof(*fcb));
 180
 181         strncpy((char *)&fcb->fingerprint, "FCB ", 4);
 182         fcb->version = cpu_to_be32(1);
 183
 184         fcb->timing.data_setup = BF_VAL(t0, GPMI_TIMING0_DATA_SETUP);
 185         fcb->timing.data_hold = BF_VAL(t0, GPMI_TIMING0_DATA_HOLD);
 186         fcb->timing.address_setup = BF_VAL(t0, GPMI_TIMING0_ADDRESS_SETUP);
 187
 188         fcb->page_data_size = mtd->writesize;
 189         fcb->total_page_size = mtd->writesize + mtd->oobsize;
 190         fcb->sectors_per_block = mtd->erasesize / mtd->writesize;
 191
 192         fcb->ecc_block0_type = BF_VAL(fl0, BCH_FLASH0LAYOUT0_ECC0);
 193         fcb->ecc_block0_size = BF_VAL(fl0, BCH_FLASH0LAYOUT0_DATA0_SIZE);
 194         fcb->ecc_blockn_type = BF_VAL(fl1, BCH_FLASH0LAYOUT1_ECCN);
 195         fcb->ecc_blockn_size = BF_VAL(fl1, BCH_FLASH0LAYOUT1_DATAN_SIZE);
 196
 197         fcb->metadata_size = BF_VAL(fl0, BCH_FLASH0LAYOUT0_META_SIZE);
 198         fcb->ecc_blocks_per_page = BF_VAL(fl0, BCH_FLASH0LAYOUT0_NBLOCKS);
 199         fcb->bch_mode = readl(bch_base + HW_BCH_MODE);
 200 /*
 201         fcb->boot_patch = 0;
 202         fcb->patch_sectors = 0;
 203 */
 204         fcb->fw1_start_page = fw1_start_block * mtd->erasesize / mtd->writesize;
 205         fcb->fw1_sectors = DIV_ROUND_UP(fw_size, mtd->writesize);
 206
 207         if (fw2_start_block != 0 && fw2_start_block < mtd->size / mtd->erasesize) {
 208                 fcb->fw2_start_page = fw2_start_block * mtd->erasesize / mtd->writesize;
 209                 fcb->fw2_sectors = fcb->fw1_sectors;
 210         }
 211
 212         fcb->dbbt_search_area = 1;
 213
 214         bb_mark_bit_offs = calc_bb_offset(mtd, fcb);
 215         if (bb_mark_bit_offs < 0)
 216                 return ERR_PTR(bb_mark_bit_offs);
 217         fcb->bb_mark_byte = bb_mark_bit_offs / 8;
 218         fcb->bb_mark_startbit = bb_mark_bit_offs % 8;
 219         fcb->bb_mark_phys_offset = mtd->writesize;
 220
 221         fcb->checksum = calc_chksum(&fcb->fingerprint, 512 - 4);
 222         return fcb;
 223 }
 224
 225 static int find_fcb(void *ref, int page)
 226 {
 227         int ret = 0;
 228         struct nand_chip *chip = mtd->priv;
 229         void *buf = malloc(mtd->erasesize);
 230
 231         if (buf == NULL) {
 232                 return -ENOMEM;
 233         }
 234         chip->select_chip(mtd, 0);
 235         chip->cmdfunc(mtd, NAND_CMD_READ0, 0x00, page);
 236         ret = chip->ecc.read_page_raw(mtd, chip, buf);
 237         if (ret) {
 238                 printf("Failed to read FCB from page %u: %d\n", page, ret);
 239                 return ret;
 240         }
 241         chip->select_chip(mtd, -1);
 242         if (memcmp(buf, ref, mtd->writesize) == 0) {
 243                 printf("%s: Found FCB in page %u (%08x)\n", __func__,
 244                         page, page * mtd->writesize);
 245                 ret = 1;
 246         }
 247         free(buf);
 248         return ret;
 249 }
 250
 251 static int write_fcb(void *buf, int block)
 252 {
 253         int ret;
 254         struct nand_chip *chip = mtd->priv;
 255         int page = block * mtd->erasesize / mtd->writesize;
 256
 257         ret = find_fcb(buf, page);
 258         if (ret > 0) {
 259                 printf("FCB at block %d is up to date\n", block);
 260                 return 0;
 261         }
 262
 263         ret = nand_erase(mtd, block * mtd->erasesize, mtd->erasesize);
 264         if (ret) {
 265                 printf("Failed to erase FCB block %u\n", block);
 266                 return ret;
 267         }
 268
 269         printf("Writing FCB to block %d @ %08x\n", block,
 270                 block * mtd->erasesize);
 271         chip->select_chip(mtd, 0);
 272         ret = chip->write_page(mtd, chip, buf, page, 0, 1);
 273         if (ret) {
 274                 printf("Failed to write FCB to block %u: %d\n", block, ret);
 275         }
 276         chip->select_chip(mtd, -1);
 277         return ret;
 278 }
 279
 280 #define chk_overlap(a,b)                                \
 281         ((a##_start_block <= b##_end_block &&           \
 282                 a##_end_block >= b##_start_block) ||    \
 283         (b##_start_block <= a##_end_block &&            \
 284                 b##_end_block >= a##_start_block))
 285
 286 #define fail_if_overlap(a,b,m1,m2) do {                         \
 287         if (chk_overlap(a, b)) {                                \
 288                 printf("%s blocks %lu..%lu overlap %s in blocks %lu..%lu!\n", \
 289                         m1, a##_start_block, a##_end_block,     \
 290                         m2, b##_start_block, b##_end_block);    \
 291                 return -EINVAL;                                 \
 292         }                                                       \
 293 } while (0)
 294
 295 int do_update(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
 296 {
 297         int ret;
 298         int block;
 299         int erase_size = mtd->erasesize;
 300         int page_size = mtd->writesize;
 301         void *buf;
 302         char *load_addr;
 303         char *file_size;
 304         size_t size = 0;
 305         void *addr = NULL;
 306         struct mx28_fcb *fcb;
 307         unsigned long fcb_start_block = FCB_START_BLOCK;
 308         unsigned long num_fcb_blocks = NUM_FCB_BLOCKS;
 309         unsigned long fcb_end_block;
 310         unsigned long mtd_num_blocks = mtd->size / mtd->erasesize;
 311         unsigned long env_start_block = CONFIG_ENV_OFFSET / mtd->erasesize;
 312         unsigned long env_end_block = env_start_block +
 313                 DIV_ROUND_UP(CONFIG_ENV_SIZE, mtd->erasesize) - 1;
 314         int optind;
 315         int fw1_set = 0;
 316         int fw2_set = 0;
 317         unsigned long fw1_start_block = 0, fw1_end_block;
 318         unsigned long fw2_start_block = 0, fw2_end_block;
 319         unsigned long fw_num_blocks;
 320         unsigned long extra_blocks = 2;
 321         nand_erase_options_t erase_opts = { 0, };
 322         int fcb_written = 0;
 323
 324         load_addr = getenv("fileaddr");
 325         file_size = getenv("filesize");
 326
 327         if (argc < 2 && load_addr == NULL) {
 328                 printf("Load address not specified\n");
 329                 return -EINVAL;
 330         }
 331         if (argc < 3 && file_size == NULL) {
 332                 printf("Image size not specified\n");
 333                 return -EINVAL;
 334         }
 335
 336         for (optind = 1; optind < argc; optind++) {
 337                 if (strcmp(argv[optind], "-b") == 0) {
 338                         if (optind >= argc - 1) {
 339                                 printf("Option %s requires an argument\n", argv[optind]);
 340                                 return -EINVAL;
 341                         }
 342                         optind++;
 343                         fcb_start_block = simple_strtoul(argv[optind], NULL, 0);
 344                         if (fcb_start_block >= mtd_num_blocks) {
 345                                 printf("Block number %lu is out of range: 0..%lu\n",
 346                                         fcb_start_block, mtd_num_blocks - 1);
 347                                 return -EINVAL;
 348                         }
 349                 } else if (strcmp(argv[optind], "-n") == 0) {
 350                         if (optind >= argc - 1) {
 351                                 printf("Option %s requires an argument\n", argv[optind]);
 352                                 return -EINVAL;
 353                         }
 354                         optind++;
 355                         num_fcb_blocks = simple_strtoul(argv[optind], NULL, 0);
 356                         if (num_fcb_blocks > MAX_FCB_BLOCKS) {
 357                                 printf("Extraneous number of FCB blocks; max. allowed: %u\n",
 358                                         MAX_FCB_BLOCKS);
 359                                 return -EINVAL;
 360                         }
 361                 } else if (strcmp(argv[optind], "-f") == 0) {
 362                         if (optind >= argc - 1) {
 363                                 printf("Option %s requires an argument\n", argv[optind]);
 364                                 return -EINVAL;
 365                         }
 366                         optind++;
 367                         fw1_start_block = simple_strtoul(argv[optind], NULL, 0);
 368                         if (fw1_start_block >= mtd_num_blocks) {
 369                                 printf("Block number %lu is out of range: 0..%lu\n",
 370                                         fw1_start_block,
 371                                         mtd_num_blocks - 1);
 372                                 return -EINVAL;
 373                         }
 374                         fw1_set = 1;
 375                 } else if (strcmp(argv[optind], "-r") == 0) {
 376                         if (optind < argc - 1 && argv[optind + 1][0] != '-') {
 377                                 optind++;
 378                                 fw2_start_block = simple_strtoul(argv[optind], NULL, 0);
 379                                 if (fw2_start_block >= mtd_num_blocks) {
 380                                         printf("Block number %lu is out of range: 0..%lu\n",
 381                                                 fw2_start_block,
 382                                                 mtd_num_blocks - 1);
 383                                         return -EINVAL;
 384                                 }
 385                         }
 386                         fw2_set = 1;
 387                 } else if (strcmp(argv[optind], "-e") == 0) {
 388                         if (optind >= argc - 1) {
 389                                 printf("Option %s requires an argument\n", argv[optind]);
 390                                 return -EINVAL;
 391                         }
 392                         optind++;
 393                         extra_blocks = simple_strtoul(argv[optind], NULL, 0);
 394                         if (extra_blocks >= mtd_num_blocks) {
 395                                 printf("Extra block count %lu is out of range: 0..%lu\n",
 396                                         extra_blocks,
 397                                         mtd_num_blocks - 1);
 398                                 return -EINVAL;
 399                         }
 400                 } else if (argv[optind][0] == '-') {
 401                         printf("Unrecognized option %s\n", argv[optind]);
 402                         return -EINVAL;
 403                 }
 404         }
 405         if (argc > optind) {
 406                 load_addr = NULL;
 407                 addr = (void *)simple_strtoul(argv[optind], NULL, 0);
 408                 optind++;
 409         }
 410         if (argc > optind) {
 411                 file_size = NULL;
 412                 size = simple_strtoul(argv[optind], NULL, 0);
 413                 optind++;
 414         }
 415         if (load_addr != NULL) {
 416                 addr = (void *)simple_strtoul(load_addr, NULL, 16);
 417                 printf("Using default load address %p\n", addr);
 418         }
 419         if (file_size != NULL) {
 420                 size = simple_strtoul(file_size, NULL, 16);
 421                 printf("Using default file size %08x\n", size);
 422         }
 423         fcb_end_block = fcb_start_block + num_fcb_blocks - 1;
 424         fw_num_blocks = DIV_ROUND_UP(size, mtd->erasesize);
 425
 426         if (!fw1_set) {
 427                 fw1_start_block = fcb_end_block + 1;
 428                 fw1_end_block = fw1_start_block + fw_num_blocks + extra_blocks - 1;
 429                 if (chk_overlap(fw1, env)) {
 430                         fw1_start_block = env_end_block + 1;
 431                         fw1_end_block = fw1_start_block + fw_num_blocks + extra_blocks - 1;
 432                 }
 433         } else {
 434                 fw1_end_block = fw1_start_block + fw_num_blocks + extra_blocks - 1;
 435         }
 436
 437         if (fw2_set && fw2_start_block == 0) {
 438                 fw2_start_block = fw1_end_block + 1;
 439                 fw2_end_block = fw2_start_block + fw_num_blocks + extra_blocks - 1;
 440                 if (chk_overlap(fw2, env)) {
 441                         fw2_start_block = env_end_block + 1;
 442                         fw2_end_block = fw2_start_block + fw_num_blocks + extra_blocks - 1;
 443                 }
 444         } else {
 445                 fw2_end_block = fw2_start_block + fw_num_blocks + extra_blocks - 1;
 446         }
 447
 448         fail_if_overlap(fcb, env, "FCB", "Environment");
 449         fail_if_overlap(fcb, fw1, "FCB", "FW1");
 450         fail_if_overlap(fw1, env, "FW1", "Environment");
 451         if (fw2_set) {
 452                 fail_if_overlap(fcb, fw2, "FCB", "FW2");
 453                 fail_if_overlap(fw2, env, "FW2", "Environment");
 454                 fail_if_overlap(fw1, fw2, "FW1", "FW2");
 455         }
 456
 457         buf = malloc(erase_size);
 458         if (buf == NULL) {
 459                 printf("Failed to allocate buffer\n");
 460                 return -ENOMEM;
 461         }
 462         /* search for first non-bad block in FW1 block range */
 463         while (fw1_start_block <= fw1_end_block) {
 464                 if (!nand_block_isbad(mtd, fw1_start_block * mtd->erasesize))
 465                         break;
 466                 fw1_start_block++;
 467         }
 468         if (fw1_end_block - fw1_start_block + 1 < fw_num_blocks) {
 469                 printf("Too many bad blocks in FW1 block range: %lu..%lu\n",
 470                         fw1_end_block + 1 - fw_num_blocks - extra_blocks,
 471                         fw1_end_block);
 472                 return -EINVAL;
 473         }
 474
 475         /* search for first non-bad block in FW2 block range */
 476         while (fw2_set && fw2_start_block <= fw2_end_block) {
 477                 if (!nand_block_isbad(mtd, fw2_start_block * mtd->erasesize))
 478                         break;
 479                 fw2_start_block++;
 480         }
 481         if (fw2_end_block - fw2_start_block + 1 < fw_num_blocks) {
 482                 printf("Too many bad blocks in FW2 area %08lx..%08lx\n",
 483                         fw2_end_block + 1 - fw_num_blocks - extra_blocks,
 484                         fw2_end_block);
 485                 return -EINVAL;
 486         }
 487
 488         fcb = create_fcb(buf, fw1_start_block, fw2_start_block,
 489                         (fw_num_blocks + extra_blocks) * mtd->erasesize);
 490         if (IS_ERR(fcb)) {
 491                 printf("Failed to initialize FCB: %ld\n", PTR_ERR(fcb));
 492                 return PTR_ERR(fcb);
 493         }
 494         encode_hamming_13_8(fcb, (void *)fcb + 512, 512);
 495
 496         for (block = fcb_start_block; block < fcb_start_block + num_fcb_blocks;
 497              block++) {
 498                 if (nand_block_isbad(mtd, block * mtd->erasesize)) {
 499                         if (block == fcb_start_block)
 500                                 fcb_start_block++;
 501                         continue;
 502                 }
 503                 ret = write_fcb(buf, block);
 504                 if (ret) {
 505                         printf("Failed to write FCB to block %u\n", block);
 506                         return ret;
 507                 }
 508                 fcb_written = 1;
 509         }
 510
 511         if (!fcb_written) {
 512                 printf("Could not write FCB to flash\n");
 513                 return -EIO;
 514         }
 515
 516         printf("Programming U-Boot image from %p to block %lu\n",
 517                 addr, fw1_start_block);
 518         if (size & (page_size - 1)) {
 519                 memset(addr + size, 0xff, size & (page_size - 1));
 520                 size = ALIGN(size, page_size);
 521         }
 522
 523         erase_opts.offset = fcb->fw1_start_page * page_size;
 524         erase_opts.length = ALIGN(size, erase_size) +
 525                 extra_blocks * mtd->erasesize;
 526         erase_opts.quiet = 1;
 527
 528         printf("Erasing flash @ %08lx..%08lx\n", erase_opts.offset,
 529                 erase_opts.offset + erase_opts.length - 1);
 530
 531         ret = nand_erase_opts(mtd, &erase_opts);
 532         if (ret) {
 533                 printf("Failed to erase flash: %d\n", ret);
 534                 return ret;
 535         }
 536         printf("Programming flash @ %08x..%08x from %p\n",
 537                 fcb->fw1_start_page * page_size,
 538                 fcb->fw1_start_page * page_size + size, addr);
 539         ret = nand_write_skip_bad(mtd, fcb->fw1_start_page * page_size,
 540                                 &size, addr);
 541         if (ret) {
 542                 printf("Failed to program flash: %d\n", ret);
 543                 return ret;
 544         }
 545         if (fw2_start_block == 0) {
 546                 return ret;
 547         }
 548
 549         printf("Programming redundant U-Boot image to block %lu\n",
 550                 fw2_start_block);
 551         erase_opts.offset = fcb->fw2_start_page * page_size;
 552         printf("Erasing flash @ %08lx..%08lx\n", erase_opts.offset,
 553                 erase_opts.offset + erase_opts.length - 1);
 554
 555         ret = nand_erase_opts(mtd, &erase_opts);
 556         if (ret) {
 557                 printf("Failed to erase flash: %d\n", ret);
 558                 return ret;
 559         }
 560         printf("Programming flash @ %08x..%08x from %p\n",
 561                 fcb->fw2_start_page * page_size,
 562                 fcb->fw2_start_page * page_size + size, addr);
 563         ret = nand_write_skip_bad(mtd, fcb->fw2_start_page * page_size,
 564                                 &size, addr);
 565         if (ret) {
 566                 printf("Failed to program flash: %d\n", ret);
 567                 return ret;
 568         }
 569         return ret;
 570 }
 571
 572 U_BOOT_CMD(romupdate, 11, 0, do_update,
 573         "Creates an FCB data structure and writes an U-Boot image to flash\n",
 574         "[-b #] [-n #] [-f #] [-r [#]] [<address>] [<length>]\n"
 575         "\t-b #\tfirst FCB block number (default 0)\n"
 576         "\t-n #\ttotal number of FCB blocks (default 1)\n"
 577         "\t-f #\twrite bootloader image at block #\n"
 578         "\t-r\twrite redundant bootloader image at next free block after first image\n"
 579         "\t-r #\twrite redundant bootloader image at block #\n"
 580         "\t-e #\tspecify number of redundant blocks per boot loader image\n"
 581         "\t<address>\tRAM address of bootloader image (default: ${fileaddr}\n"
 582         "\t<length>\tlength of bootloader image in RAM (default: ${filesize}"
 583         );