cmd/mvebu/bubt.c

   1 /*
   2  * Copyright (C) 2016 Marvell International Ltd.
   3  *
   4  * SPDX-License-Identifier:     GPL-2.0
   5  * https://spdx.org/licenses
   6  */
   7
   8 #include <config.h>
   9 #include <common.h>
  10 #include <command.h>
  11 #include <vsprintf.h>
  12 #include <errno.h>
  13 #include <dm.h>
  14
  15 #include <spi_flash.h>
  16 #include <spi.h>
  17 #include <nand.h>
  18 #include <usb.h>
  19 #include <fs.h>
  20 #include <mmc.h>
  21 #ifdef CONFIG_BLK
  22 #include <blk.h>
  23 #endif
  24 #include <u-boot/sha1.h>
  25 #include <u-boot/sha256.h>
  26
  27 #ifndef CONFIG_SYS_MMC_ENV_DEV
  28 #define CONFIG_SYS_MMC_ENV_DEV  0
  29 #endif
  30
  31 #if defined(CONFIG_ARMADA_8K)
  32 #define MAIN_HDR_MAGIC          0xB105B002
  33
  34 struct mvebu_image_header {
  35         u32     magic;                  /*  0-3  */
  36         u32     prolog_size;            /*  4-7  */
  37         u32     prolog_checksum;        /*  8-11 */
  38         u32     boot_image_size;        /* 12-15 */
  39         u32     boot_image_checksum;    /* 16-19 */
  40         u32     rsrvd0;                 /* 20-23 */
  41         u32     load_addr;              /* 24-27 */
  42         u32     exec_addr;              /* 28-31 */
  43         u8      uart_cfg;               /*  32   */
  44         u8      baudrate;               /*  33   */
  45         u8      ext_count;              /*  34   */
  46         u8      aux_flags;              /*  35   */
  47         u32     io_arg_0;               /* 36-39 */
  48         u32     io_arg_1;               /* 40-43 */
  49         u32     io_arg_2;               /* 43-47 */
  50         u32     io_arg_3;               /* 48-51 */
  51         u32     rsrvd1;                 /* 52-55 */
  52         u32     rsrvd2;                 /* 56-59 */
  53         u32     rsrvd3;                 /* 60-63 */
  54 };
  55 #elif defined(CONFIG_ARMADA_3700)       /* A3700 */
  56 #define HASH_SUM_LEN            16
  57 #define IMAGE_VERSION_3_6_0     0x030600
  58 #define IMAGE_VERSION_3_5_0     0x030500
  59
  60 struct common_tim_data {
  61         u32     version;
  62         u32     identifier;
  63         u32     trusted;
  64         u32     issue_date;
  65         u32     oem_unique_id;
  66         u32     reserved[5];            /* Reserve 20 bytes */
  67         u32     boot_flash_sign;
  68         u32     num_images;
  69         u32     num_keys;
  70         u32     size_of_reserved;
  71 };
  72
  73 struct mvebu_image_info {
  74         u32     image_id;
  75         u32     next_image_id;
  76         u32     flash_entry_addr;
  77         u32     load_addr;
  78         u32     image_size;
  79         u32     image_size_to_hash;
  80         u32     hash_algorithm_id;
  81         u32     hash[HASH_SUM_LEN];     /* Reserve 512 bits for the hash */
  82         u32     partition_number;
  83         u32     enc_algorithm_id;
  84         u32     encrypt_start_offset;
  85         u32     encrypt_size;
  86 };
  87 #endif /* CONFIG_ARMADA_XXX */
  88
  89 struct bubt_dev {
  90         char name[8];
  91         size_t (*read)(const char *file_name);
  92         int (*write)(size_t image_size);
  93         int (*active)(void);
  94 };
  95
  96 static ulong get_load_addr(void)
  97 {
  98         const char *addr_str;
  99         unsigned long addr;
 100
 101         addr_str = env_get("loadaddr");
 102         if (addr_str)
 103                 addr = simple_strtoul(addr_str, NULL, 16);
 104         else
 105                 addr = CONFIG_SYS_LOAD_ADDR;
 106
 107         return addr;
 108 }
 109
 110 /********************************************************************
 111  *     eMMC services
 112  ********************************************************************/
 113 #ifdef CONFIG_DM_MMC
 114 static int mmc_burn_image(size_t image_size)
 115 {
 116         struct mmc      *mmc;
 117         lbaint_t        start_lba;
 118         lbaint_t        blk_count;
 119         ulong           blk_written;
 120         int             err;
 121         const u8        mmc_dev_num = CONFIG_SYS_MMC_ENV_DEV;
 122 #ifdef CONFIG_BLK
 123         struct blk_desc *blk_desc;
 124 #endif
 125         mmc = find_mmc_device(mmc_dev_num);
 126         if (!mmc) {
 127                 printf("No SD/MMC/eMMC card found\n");
 128                 return -ENOMEDIUM;
 129         }
 130
 131         err = mmc_init(mmc);
 132         if (err) {
 133                 printf("%s(%d) init failed\n", IS_SD(mmc) ? "SD" : "MMC",
 134                        mmc_dev_num);
 135                 return err;
 136         }
 137
 138 #ifdef CONFIG_SYS_MMC_ENV_PART
 139         if (mmc->part_num != CONFIG_SYS_MMC_ENV_PART) {
 140                 err = mmc_switch_part(mmc_dev_num, CONFIG_SYS_MMC_ENV_PART);
 141                 if (err) {
 142                         printf("MMC partition switch failed\n");
 143                         return err;
 144                 }
 145         }
 146 #endif
 147
 148         /* SD reserves LBA-0 for MBR and boots from LBA-1,
 149          * MMC/eMMC boots from LBA-0
 150          */
 151         start_lba = IS_SD(mmc) ? 1 : 0;
 152 #ifdef CONFIG_BLK
 153         blk_count = image_size / mmc->write_bl_len;
 154         if (image_size % mmc->write_bl_len)
 155                 blk_count += 1;
 156
 157         blk_desc = mmc_get_blk_desc(mmc);
 158         if (!blk_desc) {
 159                 printf("Error - failed to obtain block descriptor\n");
 160                 return -ENODEV;
 161         }
 162         blk_written = blk_dwrite(blk_desc, start_lba, blk_count,
 163                                  (void *)get_load_addr());
 164 #else
 165         blk_count = image_size / mmc->block_dev.blksz;
 166         if (image_size % mmc->block_dev.blksz)
 167                 blk_count += 1;
 168
 169         blk_written = mmc->block_dev.block_write(mmc_dev_num,
 170                                                  start_lba, blk_count,
 171                                                  (void *)get_load_addr());
 172 #endif /* CONFIG_BLK */
 173         if (blk_written != blk_count) {
 174                 printf("Error - written %#lx blocks\n", blk_written);
 175                 return -ENOSPC;
 176         }
 177         printf("Done!\n");
 178
 179 #ifdef CONFIG_SYS_MMC_ENV_PART
 180         if (mmc->part_num != CONFIG_SYS_MMC_ENV_PART)
 181                 mmc_switch_part(mmc_dev_num, mmc->part_num);
 182 #endif
 183
 184         return 0;
 185 }
 186
 187 static size_t mmc_read_file(const char *file_name)
 188 {
 189         loff_t          act_read = 0;
 190         int             rc;
 191         struct mmc      *mmc;
 192         const u8        mmc_dev_num = CONFIG_SYS_MMC_ENV_DEV;
 193
 194         mmc = find_mmc_device(mmc_dev_num);
 195         if (!mmc) {
 196                 printf("No SD/MMC/eMMC card found\n");
 197                 return 0;
 198         }
 199
 200         if (mmc_init(mmc)) {
 201                 printf("%s(%d) init failed\n", IS_SD(mmc) ? "SD" : "MMC",
 202                        mmc_dev_num);
 203                 return 0;
 204         }
 205
 206         /* Load from data partition (0) */
 207         if (fs_set_blk_dev("mmc", "0", FS_TYPE_ANY)) {
 208                 printf("Error: MMC 0 not found\n");
 209                 return 0;
 210         }
 211
 212         /* Perfrom file read */
 213         rc = fs_read(file_name, get_load_addr(), 0, 0, &act_read);
 214         if (rc)
 215                 return 0;
 216
 217         return act_read;
 218 }
 219
 220 static int is_mmc_active(void)
 221 {
 222         return 1;
 223 }
 224 #else /* CONFIG_DM_MMC */
 225 static int mmc_burn_image(size_t image_size)
 226 {
 227         return -ENODEV;
 228 }
 229
 230 static size_t mmc_read_file(const char *file_name)
 231 {
 232         return 0;
 233 }
 234
 235 static int is_mmc_active(void)
 236 {
 237         return 0;
 238 }
 239 #endif /* CONFIG_DM_MMC */
 240
 241 /********************************************************************
 242  *     SPI services
 243  ********************************************************************/
 244 #ifdef CONFIG_SPI_FLASH
 245 static int spi_burn_image(size_t image_size)
 246 {
 247         int ret;
 248         struct spi_flash *flash;
 249         u32 erase_bytes;
 250
 251         /* Probe the SPI bus to get the flash device */
 252         flash = spi_flash_probe(CONFIG_ENV_SPI_BUS,
 253                                 CONFIG_ENV_SPI_CS,
 254                                 CONFIG_SF_DEFAULT_SPEED,
 255                                 CONFIG_SF_DEFAULT_MODE);
 256         if (!flash) {
 257                 printf("Failed to probe SPI Flash\n");
 258                 return -ENOMEDIUM;
 259         }
 260
 261 #ifdef CONFIG_SPI_FLASH_PROTECTION
 262         spi_flash_protect(flash, 0);
 263 #endif
 264         erase_bytes = image_size +
 265                 (flash->erase_size - image_size % flash->erase_size);
 266         printf("Erasing %d bytes (%d blocks) at offset 0 ...",
 267                erase_bytes, erase_bytes / flash->erase_size);
 268         ret = spi_flash_erase(flash, 0, erase_bytes);
 269         if (ret)
 270                 printf("Error!\n");
 271         else
 272                 printf("Done!\n");
 273
 274         printf("Writing %d bytes from 0x%lx to offset 0 ...",
 275                (int)image_size, get_load_addr());
 276         ret = spi_flash_write(flash, 0, image_size, (void *)get_load_addr());
 277         if (ret)
 278                 printf("Error!\n");
 279         else
 280                 printf("Done!\n");
 281
 282 #ifdef CONFIG_SPI_FLASH_PROTECTION
 283         spi_flash_protect(flash, 1);
 284 #endif
 285
 286         return ret;
 287 }
 288
 289 static int is_spi_active(void)
 290 {
 291         return 1;
 292 }
 293
 294 #else /* CONFIG_SPI_FLASH */
 295 static int spi_burn_image(size_t image_size)
 296 {
 297         return -ENODEV;
 298 }
 299
 300 static int is_spi_active(void)
 301 {
 302         return 0;
 303 }
 304 #endif /* CONFIG_SPI_FLASH */
 305
 306 /********************************************************************
 307  *     NAND services
 308  ********************************************************************/
 309 #ifdef CONFIG_CMD_NAND
 310 static int nand_burn_image(size_t image_size)
 311 {
 312         int ret;
 313         uint32_t block_size;
 314         struct mtd_info *mtd;
 315
 316         mtd = get_nand_dev_by_index(nand_curr_device);
 317         if (!mtd) {
 318                 puts("\nno devices available\n");
 319                 return -ENOMEDIUM;
 320         }
 321         block_size = mtd->erasesize;
 322
 323         /* Align U-Boot size to currently used blocksize */
 324         image_size = ((image_size + (block_size - 1)) & (~(block_size - 1)));
 325
 326         /* Erase the U-BOOT image space */
 327         printf("Erasing 0x%x - 0x%x:...", 0, (int)image_size);
 328         ret = nand_erase(mtd, 0, image_size);
 329         if (ret) {
 330                 printf("Error!\n");
 331                 goto error;
 332         }
 333         printf("Done!\n");
 334
 335         /* Write the image to flash */
 336         printf("Writing %d bytes from 0x%lx to offset 0 ... ",
 337                (int)image_size, get_load_addr());
 338         ret = nand_write(mtd, 0, &image_size, (void *)get_load_addr());
 339         if (ret)
 340                 printf("Error!\n");
 341         else
 342                 printf("Done!\n");
 343
 344 error:
 345         return ret;
 346 }
 347
 348 static int is_nand_active(void)
 349 {
 350         return 1;
 351 }
 352
 353 #else /* CONFIG_CMD_NAND */
 354 static int nand_burn_image(size_t image_size)
 355 {
 356         return -ENODEV;
 357 }
 358
 359 static int is_nand_active(void)
 360 {
 361         return 0;
 362 }
 363 #endif /* CONFIG_CMD_NAND */
 364
 365 /********************************************************************
 366  *     USB services
 367  ********************************************************************/
 368 #if defined(CONFIG_USB_STORAGE) && defined(CONFIG_BLK)
 369 static size_t usb_read_file(const char *file_name)
 370 {
 371         loff_t act_read = 0;
 372         struct udevice *dev;
 373         int rc;
 374
 375         usb_stop();
 376
 377         if (usb_init() < 0) {
 378                 printf("Error: usb_init failed\n");
 379                 return 0;
 380         }
 381
 382         /* Try to recognize storage devices immediately */
 383         blk_first_device(IF_TYPE_USB, &dev);
 384         if (!dev) {
 385                 printf("Error: USB storage device not found\n");
 386                 return 0;
 387         }
 388
 389         /* Always load from usb 0 */
 390         if (fs_set_blk_dev("usb", "0", FS_TYPE_ANY)) {
 391                 printf("Error: USB 0 not found\n");
 392                 return 0;
 393         }
 394
 395         /* Perfrom file read */
 396         rc = fs_read(file_name, get_load_addr(), 0, 0, &act_read);
 397         if (rc)
 398                 return 0;
 399
 400         return act_read;
 401 }
 402
 403 static int is_usb_active(void)
 404 {
 405         return 1;
 406 }
 407
 408 #else /* defined(CONFIG_USB_STORAGE) && defined (CONFIG_BLK) */
 409 static size_t usb_read_file(const char *file_name)
 410 {
 411         return 0;
 412 }
 413
 414 static int is_usb_active(void)
 415 {
 416         return 0;
 417 }
 418 #endif /* defined(CONFIG_USB_STORAGE) && defined (CONFIG_BLK) */
 419
 420 /********************************************************************
 421  *     Network services
 422  ********************************************************************/
 423 #ifdef CONFIG_CMD_NET
 424 static size_t tftp_read_file(const char *file_name)
 425 {
 426         /* update global variable load_addr before tftp file from network */
 427         load_addr = get_load_addr();
 428         return net_loop(TFTPGET);
 429 }
 430
 431 static int is_tftp_active(void)
 432 {
 433         return 1;
 434 }
 435
 436 #else
 437 static size_t tftp_read_file(const char *file_name)
 438 {
 439         return 0;
 440 }
 441
 442 static int is_tftp_active(void)
 443 {
 444         return 0;
 445 }
 446 #endif /* CONFIG_CMD_NET */
 447
 448 enum bubt_devices {
 449         BUBT_DEV_NET = 0,
 450         BUBT_DEV_USB,
 451         BUBT_DEV_MMC,
 452         BUBT_DEV_SPI,
 453         BUBT_DEV_NAND,
 454
 455         BUBT_MAX_DEV
 456 };
 457
 458 struct bubt_dev bubt_devs[BUBT_MAX_DEV] = {
 459         {"tftp", tftp_read_file, NULL, is_tftp_active},
 460         {"usb",  usb_read_file,  NULL, is_usb_active},
 461         {"mmc",  mmc_read_file,  mmc_burn_image, is_mmc_active},
 462         {"spi",  NULL, spi_burn_image,  is_spi_active},
 463         {"nand", NULL, nand_burn_image, is_nand_active},
 464 };
 465
 466 static int bubt_write_file(struct bubt_dev *dst, size_t image_size)
 467 {
 468         if (!dst->write) {
 469                 printf("Error: Write not supported on device %s\n", dst->name);
 470                 return -ENOTSUPP;
 471         }
 472
 473         return dst->write(image_size);
 474 }
 475
 476 #if defined(CONFIG_ARMADA_8K)
 477 u32 do_checksum32(u32 *start, int32_t len)
 478 {
 479         u32 sum = 0;
 480         u32 *startp = start;
 481
 482         do {
 483                 sum += *startp;
 484                 startp++;
 485                 len -= 4;
 486         } while (len > 0);
 487
 488         return sum;
 489 }
 490
 491 static int check_image_header(void)
 492 {
 493         struct mvebu_image_header *hdr =
 494                         (struct mvebu_image_header *)get_load_addr();
 495         u32 header_len = hdr->prolog_size;
 496         u32 checksum;
 497         u32 checksum_ref = hdr->prolog_checksum;
 498
 499         /*
 500          * For now compare checksum, and magic. Later we can
 501          * verify more stuff on the header like interface type, etc
 502          */
 503         if (hdr->magic != MAIN_HDR_MAGIC) {
 504                 printf("ERROR: Bad MAGIC 0x%08x != 0x%08x\n",
 505                        hdr->magic, MAIN_HDR_MAGIC);
 506                 return -ENOEXEC;
 507         }
 508
 509         /* The checksum value is discarded from checksum calculation */
 510         hdr->prolog_checksum = 0;
 511
 512         checksum = do_checksum32((u32 *)hdr, header_len);
 513         if (checksum != checksum_ref) {
 514                 printf("Error: Bad Image checksum. 0x%x != 0x%x\n",
 515                        checksum, checksum_ref);
 516                 return -ENOEXEC;
 517         }
 518
 519         /* Restore the checksum before writing */
 520         hdr->prolog_checksum = checksum_ref;
 521         printf("Image checksum...OK!\n");
 522
 523         return 0;
 524 }
 525 #elif defined(CONFIG_ARMADA_3700) /* Armada 3700 */
 526 static int check_image_header(void)
 527 {
 528         struct common_tim_data *hdr = (struct common_tim_data *)get_load_addr();
 529         int image_num;
 530         u8 hash_160_output[SHA1_SUM_LEN];
 531         u8 hash_256_output[SHA256_SUM_LEN];
 532         sha1_context hash1_text;
 533         sha256_context hash256_text;
 534         u8 *hash_output;
 535         u32 hash_algorithm_id;
 536         u32 image_size_to_hash;
 537         u32 flash_entry_addr;
 538         u32 *hash_value;
 539         u32 internal_hash[HASH_SUM_LEN];
 540         const u8 *buff;
 541         u32 num_of_image = hdr->num_images;
 542         u32 version = hdr->version;
 543         u32 trusted = hdr->trusted;
 544
 545         /* bubt checksum validation only supports nontrusted images */
 546         if (trusted == 1) {
 547                 printf("bypass image validation, ");
 548                 printf("only untrusted image is supported now\n");
 549                 return 0;
 550         }
 551         /* only supports image version 3.5 and 3.6 */
 552         if (version != IMAGE_VERSION_3_5_0 && version != IMAGE_VERSION_3_6_0) {
 553                 printf("Error: Unsupported Image version = 0x%08x\n", version);
 554                 return -ENOEXEC;
 555         }
 556         /* validate images hash value */
 557         for (image_num = 0; image_num < num_of_image; image_num++) {
 558                 struct mvebu_image_info *info =
 559                                 (struct mvebu_image_info *)(get_load_addr() +
 560                                 sizeof(struct common_tim_data) +
 561                                 image_num * sizeof(struct mvebu_image_info));
 562                 hash_algorithm_id = info->hash_algorithm_id;
 563                 image_size_to_hash = info->image_size_to_hash;
 564                 flash_entry_addr = info->flash_entry_addr;
 565                 hash_value = info->hash;
 566                 buff = (const u8 *)(get_load_addr() + flash_entry_addr);
 567
 568                 if (image_num == 0) {
 569                         /*
 570                          * The first image includes hash values in its content.
 571                          * For hash calculation, we need to save the original
 572                          * hash values to a local variable that will be
 573                          * copied back for comparsion and set all zeros to
 574                          * the orignal hash values for calculating new value.
 575                          * First image original format :
 576                          * x...x (datum1) x...x(orig. hash values) x...x(datum2)
 577                          * Replaced first image format :
 578                          * x...x (datum1) 0...0(hash values) x...x(datum2)
 579                          */
 580                         memcpy(internal_hash, hash_value,
 581                                sizeof(internal_hash));
 582                         memset(hash_value, 0, sizeof(internal_hash));
 583                 }
 584                 if (image_size_to_hash == 0) {
 585                         printf("Warning: Image_%d hash checksum is disabled, ",
 586                                image_num);
 587                         printf("skip the image validation.\n");
 588                         continue;
 589                 }
 590                 switch (hash_algorithm_id) {
 591                 case SHA1_SUM_LEN:
 592                         sha1_starts(&hash1_text);
 593                         sha1_update(&hash1_text, buff, image_size_to_hash);
 594                         sha1_finish(&hash1_text, hash_160_output);
 595                         hash_output = hash_160_output;
 596                         break;
 597                 case SHA256_SUM_LEN:
 598                         sha256_starts(&hash256_text);
 599                         sha256_update(&hash256_text, buff, image_size_to_hash);
 600                         sha256_finish(&hash256_text, hash_256_output);
 601                         hash_output = hash_256_output;
 602                         break;
 603                 default:
 604                         printf("Error: Unsupported hash_algorithm_id = %d\n",
 605                                hash_algorithm_id);
 606                         return -ENOEXEC;
 607                 }
 608                 if (image_num == 0)
 609                         memcpy(hash_value, internal_hash,
 610                                sizeof(internal_hash));
 611                 if (memcmp(hash_value, hash_output, hash_algorithm_id) != 0) {
 612                         printf("Error: Image_%d checksum is not correct\n",
 613                                image_num);
 614                         return -ENOEXEC;
 615                 }
 616         }
 617         printf("Image checksum...OK!\n");
 618
 619         return 0;
 620 }
 621
 622 #else /* Not ARMADA? */
 623 static int check_image_header(void)
 624 {
 625         printf("bubt cmd does not support this SoC device or family!\n");
 626         return -ENOEXEC;
 627 }
 628 #endif
 629
 630 static int bubt_verify(size_t image_size)
 631 {
 632         int err;
 633
 634         /* Check a correct image header exists */
 635         err = check_image_header();
 636         if (err) {
 637                 printf("Error: Image header verification failed\n");
 638                 return err;
 639         }
 640
 641         return 0;
 642 }
 643
 644 static int bubt_read_file(struct bubt_dev *src)
 645 {
 646         size_t image_size;
 647
 648         if (!src->read) {
 649                 printf("Error: Read not supported on device \"%s\"\n",
 650                        src->name);
 651                 return 0;
 652         }
 653
 654         image_size = src->read(net_boot_file_name);
 655         if (image_size <= 0) {
 656                 printf("Error: Failed to read file %s from %s\n",
 657                        net_boot_file_name, src->name);
 658                 return 0;
 659         }
 660
 661         return image_size;
 662 }
 663
 664 static int bubt_is_dev_active(struct bubt_dev *dev)
 665 {
 666         if (!dev->active) {
 667                 printf("Device \"%s\" not supported by U-BOOT image\n",
 668                        dev->name);
 669                 return 0;
 670         }
 671
 672         if (!dev->active()) {
 673                 printf("Device \"%s\" is inactive\n", dev->name);
 674                 return 0;
 675         }
 676
 677         return 1;
 678 }
 679
 680 struct bubt_dev *find_bubt_dev(char *dev_name)
 681 {
 682         int dev;
 683
 684         for (dev = 0; dev < BUBT_MAX_DEV; dev++) {
 685                 if (strcmp(bubt_devs[dev].name, dev_name) == 0)
 686                         return &bubt_devs[dev];
 687         }
 688
 689         return 0;
 690 }
 691
 692 #define DEFAULT_BUBT_SRC "tftp"
 693
 694 #ifndef DEFAULT_BUBT_DST
 695 #ifdef CONFIG_MVEBU_SPI_BOOT
 696 #define DEFAULT_BUBT_DST "spi"
 697 #elif defined(CONFIG_MVEBU_NAND_BOOT)
 698 #define DEFAULT_BUBT_DST "nand"
 699 #elif defined(CONFIG_MVEBU_MMC_BOOT)
 700 #define DEFAULT_BUBT_DST "mmc"
 701 else
 702 #define DEFAULT_BUBT_DST "error"
 703 #endif
 704 #endif /* DEFAULT_BUBT_DST */
 705
 706 int do_bubt_cmd(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 707 {
 708         struct bubt_dev *src, *dst;
 709         size_t image_size;
 710         char src_dev_name[8];
 711         char dst_dev_name[8];
 712         char *name;
 713         int  err;
 714
 715         if (argc < 2)
 716                 copy_filename(net_boot_file_name,
 717                               CONFIG_MVEBU_UBOOT_DFLT_NAME,
 718                               sizeof(net_boot_file_name));
 719         else
 720                 copy_filename(net_boot_file_name, argv[1],
 721                               sizeof(net_boot_file_name));
 722
 723         if (argc >= 3) {
 724                 strncpy(dst_dev_name, argv[2], 8);
 725         } else {
 726                 name = DEFAULT_BUBT_DST;
 727                 strncpy(dst_dev_name, name, 8);
 728         }
 729
 730         if (argc >= 4)
 731                 strncpy(src_dev_name, argv[3], 8);
 732         else
 733                 strncpy(src_dev_name, DEFAULT_BUBT_SRC, 8);
 734
 735         /* Figure out the destination device */
 736         dst = find_bubt_dev(dst_dev_name);
 737         if (!dst) {
 738                 printf("Error: Unknown destination \"%s\"\n", dst_dev_name);
 739                 return -EINVAL;
 740         }
 741
 742         if (!bubt_is_dev_active(dst))
 743                 return -ENODEV;
 744
 745         /* Figure out the source device */
 746         src = find_bubt_dev(src_dev_name);
 747         if (!src) {
 748                 printf("Error: Unknown source \"%s\"\n", src_dev_name);
 749                 return 1;
 750         }
 751
 752         if (!bubt_is_dev_active(src))
 753                 return -ENODEV;
 754
 755         printf("Burning U-BOOT image \"%s\" from \"%s\" to \"%s\"\n",
 756                net_boot_file_name, src->name, dst->name);
 757
 758         image_size = bubt_read_file(src);
 759         if (!image_size)
 760                 return -EIO;
 761
 762         err = bubt_verify(image_size);
 763         if (err)
 764                 return err;
 765
 766         err = bubt_write_file(dst, image_size);
 767         if (err)
 768                 return err;
 769
 770         return 0;
 771 }
 772
 773 U_BOOT_CMD(
 774         bubt, 4, 0, do_bubt_cmd,
 775         "Burn a u-boot image to flash",
 776         "[file-name] [destination [source]]\n"
 777         "\t-file-name     The image file name to burn. Default = flash-image.bin\n"
 778         "\t-destination   Flash to burn to [spi, nand, mmc]. Default = active boot device\n"
 779         "\t-source        The source to load image from [tftp, usb, mmc]. Default = tftp\n"
 780         "Examples:\n"
 781         "\tbubt - Burn flash-image.bin from tftp to active boot device\n"
 782         "\tbubt flash-image-new.bin nand - Burn flash-image-new.bin from tftp to NAND flash\n"
 783         "\tbubt backup-flash-image.bin mmc usb - Burn backup-flash-image.bin from usb to MMC\n"
 784
 785 );