cmd/ubi.c

   1 /*
   2  * Unsorted Block Image commands
   3  *
   4  *  Copyright (C) 2008 Samsung Electronics
   5  *  Kyungmin Park <[email protected]>
   6  *
   7  * Copyright 2008-2009 Stefan Roese <[email protected]>, DENX Software Engineering
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13
  14 #include <command.h>
  15 #include <env.h>
  16 #include <exports.h>
  17 #include <malloc.h>
  18 #include <memalign.h>
  19 #include <mtd.h>
  20 #include <nand.h>
  21 #include <onenand_uboot.h>
  22 #include <dm/devres.h>
  23 #include <linux/mtd/mtd.h>
  24 #include <linux/mtd/partitions.h>
  25 #include <linux/err.h>
  26 #include <ubi_uboot.h>
  27 #include <linux/errno.h>
  28 #include <jffs2/load_kernel.h>
  29 #include <linux/log2.h>
  30
  31 #undef ubi_msg
  32 #define ubi_msg(fmt, ...) printf("UBI: " fmt "\n", ##__VA_ARGS__)
  33
  34 /* Private own data */
  35 static struct ubi_device *ubi;
  36
  37 #ifdef CONFIG_CMD_UBIFS
  38 #include <ubifs_uboot.h>
  39 #endif
  40
  41 static void display_volume_info(struct ubi_device *ubi)
  42 {
  43         int i;
  44
  45         for (i = 0; i < (ubi->vtbl_slots + 1); i++) {
  46                 if (!ubi->volumes[i])
  47                         continue;       /* Empty record */
  48                 ubi_dump_vol_info(ubi->volumes[i]);
  49         }
  50 }
  51
  52 static void display_ubi_info(struct ubi_device *ubi)
  53 {
  54         ubi_msg("MTD device name:            \"%s\"", ubi->mtd->name);
  55         ubi_msg("MTD device size:            %llu MiB", ubi->flash_size >> 20);
  56         ubi_msg("physical eraseblock size:   %d bytes (%d KiB)",
  57                         ubi->peb_size, ubi->peb_size >> 10);
  58         ubi_msg("logical eraseblock size:    %d bytes", ubi->leb_size);
  59         ubi_msg("number of good PEBs:        %d", ubi->good_peb_count);
  60         ubi_msg("number of bad PEBs:         %d", ubi->bad_peb_count);
  61         ubi_msg("smallest flash I/O unit:    %d", ubi->min_io_size);
  62         ubi_msg("VID header offset:          %d (aligned %d)",
  63                         ubi->vid_hdr_offset, ubi->vid_hdr_aloffset);
  64         ubi_msg("data offset:                %d", ubi->leb_start);
  65         ubi_msg("max. allowed volumes:       %d", ubi->vtbl_slots);
  66         ubi_msg("wear-leveling threshold:    %d", CONFIG_MTD_UBI_WL_THRESHOLD);
  67         ubi_msg("number of internal volumes: %d", UBI_INT_VOL_COUNT);
  68         ubi_msg("number of user volumes:     %d",
  69                         ubi->vol_count - UBI_INT_VOL_COUNT);
  70         ubi_msg("available PEBs:             %d", ubi->avail_pebs);
  71         ubi_msg("total number of reserved PEBs: %d", ubi->rsvd_pebs);
  72         ubi_msg("number of PEBs reserved for bad PEB handling: %d",
  73                         ubi->beb_rsvd_pebs);
  74         ubi_msg("max/mean erase counter: %d/%d", ubi->max_ec, ubi->mean_ec);
  75 }
  76
  77 static int ubi_info(int layout)
  78 {
  79         if (layout)
  80                 display_volume_info(ubi);
  81         else
  82                 display_ubi_info(ubi);
  83
  84         return 0;
  85 }
  86
  87 static int ubi_list(const char *var, int numeric)
  88 {
  89         size_t namelen, len, size;
  90         char *str, *str2;
  91         int i;
  92
  93         if (!var) {
  94                 for (i = 0; i < (ubi->vtbl_slots + 1); i++) {
  95                         if (!ubi->volumes[i])
  96                                 continue;
  97                         if (ubi->volumes[i]->vol_id >= UBI_INTERNAL_VOL_START)
  98                                 continue;
  99                         printf("%d: %s\n",
 100                                ubi->volumes[i]->vol_id,
 101                                ubi->volumes[i]->name);
 102                 }
 103                 return 0;
 104         }
 105
 106         len = 0;
 107         size = 16;
 108         str = malloc(size);
 109         if (!str)
 110                 return 1;
 111
 112         for (i = 0; i < (ubi->vtbl_slots + 1); i++) {
 113                 if (!ubi->volumes[i])
 114                         continue;
 115                 if (ubi->volumes[i]->vol_id >= UBI_INTERNAL_VOL_START)
 116                         continue;
 117
 118                 if (numeric)
 119                         namelen = 10; /* strlen(stringify(INT_MAX)) */
 120                 else
 121                         namelen = strlen(ubi->volumes[i]->name);
 122
 123                 if (len + namelen + 1 > size) {
 124                         size = roundup_pow_of_two(len + namelen + 1) * 2;
 125                         str2 = realloc(str, size);
 126                         if (!str2) {
 127                                 free(str);
 128                                 return 1;
 129                         }
 130                         str = str2;
 131                 }
 132
 133                 if (len)
 134                         str[len++] = ' ';
 135
 136                 if (numeric) {
 137                         len += sprintf(str + len, "%d", ubi->volumes[i]->vol_id) + 1;
 138                 } else {
 139                         memcpy(str + len, ubi->volumes[i]->name, namelen);
 140                         len += namelen;
 141                         str[len] = 0;
 142                 }
 143         }
 144
 145         env_set(var, str);
 146         free(str);
 147
 148         return 0;
 149 }
 150
 151 static int ubi_check_volumename(const struct ubi_volume *vol, char *name)
 152 {
 153         return strcmp(vol->name, name);
 154 }
 155
 156 static int ubi_check(char *name)
 157 {
 158         int i;
 159
 160         for (i = 0; i < (ubi->vtbl_slots + 1); i++) {
 161                 if (!ubi->volumes[i])
 162                         continue;       /* Empty record */
 163
 164                 if (!ubi_check_volumename(ubi->volumes[i], name))
 165                         return 0;
 166         }
 167
 168         return 1;
 169 }
 170
 171 static int verify_mkvol_req(const struct ubi_device *ubi,
 172                             const struct ubi_mkvol_req *req)
 173 {
 174         int n, err = EINVAL;
 175
 176         if (req->bytes < 0 || req->alignment < 0 || req->vol_type < 0 ||
 177             req->name_len < 0)
 178                 goto bad;
 179
 180         if ((req->vol_id < 0 || req->vol_id >= ubi->vtbl_slots) &&
 181             req->vol_id != UBI_VOL_NUM_AUTO)
 182                 goto bad;
 183
 184         if (req->alignment == 0)
 185                 goto bad;
 186
 187         if (req->bytes == 0) {
 188                 printf("No space left in UBI device!\n");
 189                 err = ENOMEM;
 190                 goto bad;
 191         }
 192
 193         if (req->vol_type != UBI_DYNAMIC_VOLUME &&
 194             req->vol_type != UBI_STATIC_VOLUME)
 195                 goto bad;
 196
 197         if (req->alignment > ubi->leb_size)
 198                 goto bad;
 199
 200         n = req->alignment % ubi->min_io_size;
 201         if (req->alignment != 1 && n)
 202                 goto bad;
 203
 204         if (req->name_len > UBI_VOL_NAME_MAX) {
 205                 printf("Name too long!\n");
 206                 err = ENAMETOOLONG;
 207                 goto bad;
 208         }
 209
 210         return 0;
 211 bad:
 212         return err;
 213 }
 214
 215 static int ubi_create_vol(char *volume, int64_t size, int dynamic, int vol_id,
 216                           bool skipcheck)
 217 {
 218         struct ubi_mkvol_req req;
 219         int err;
 220
 221         if (dynamic)
 222                 req.vol_type = UBI_DYNAMIC_VOLUME;
 223         else
 224                 req.vol_type = UBI_STATIC_VOLUME;
 225
 226         req.vol_id = vol_id;
 227         req.alignment = 1;
 228         req.bytes = size;
 229
 230         strcpy(req.name, volume);
 231         req.name_len = strlen(volume);
 232         req.name[req.name_len] = '\0';
 233         req.flags = 0;
 234         if (skipcheck)
 235                 req.flags |= UBI_VOL_SKIP_CRC_CHECK_FLG;
 236
 237         /* It's duplicated at drivers/mtd/ubi/cdev.c */
 238         err = verify_mkvol_req(ubi, &req);
 239         if (err) {
 240                 printf("verify_mkvol_req failed %d\n", err);
 241                 return err;
 242         }
 243         printf("Creating %s volume %s of size %lld\n",
 244                 dynamic ? "dynamic" : "static", volume, size);
 245         /* Call real ubi create volume */
 246         return ubi_create_volume(ubi, &req);
 247 }
 248
 249 static struct ubi_volume *ubi_find_volume(char *volume)
 250 {
 251         struct ubi_volume *vol = NULL;
 252         int i;
 253
 254         for (i = 0; i < ubi->vtbl_slots; i++) {
 255                 vol = ubi->volumes[i];
 256                 if (vol && !strcmp(vol->name, volume))
 257                         return vol;
 258         }
 259
 260         printf("Volume %s not found!\n", volume);
 261         return NULL;
 262 }
 263
 264 static int ubi_remove_vol(char *volume)
 265 {
 266         int err, reserved_pebs, i;
 267         struct ubi_volume *vol;
 268
 269         vol = ubi_find_volume(volume);
 270         if (vol == NULL)
 271                 return ENODEV;
 272
 273         printf("Remove UBI volume %s (id %d)\n", vol->name, vol->vol_id);
 274
 275         if (ubi->ro_mode) {
 276                 printf("It's read-only mode\n");
 277                 err = EROFS;
 278                 goto out_err;
 279         }
 280
 281         err = ubi_change_vtbl_record(ubi, vol->vol_id, NULL);
 282         if (err) {
 283                 printf("Error changing Vol tabel record err=%x\n", err);
 284                 goto out_err;
 285         }
 286         reserved_pebs = vol->reserved_pebs;
 287         for (i = 0; i < vol->reserved_pebs; i++) {
 288                 err = ubi_eba_unmap_leb(ubi, vol, i);
 289                 if (err)
 290                         goto out_err;
 291         }
 292
 293         kfree(vol->eba_tbl);
 294         ubi->volumes[vol->vol_id]->eba_tbl = NULL;
 295         ubi->volumes[vol->vol_id] = NULL;
 296
 297         ubi->rsvd_pebs -= reserved_pebs;
 298         ubi->avail_pebs += reserved_pebs;
 299         i = ubi->beb_rsvd_level - ubi->beb_rsvd_pebs;
 300         if (i > 0) {
 301                 i = ubi->avail_pebs >= i ? i : ubi->avail_pebs;
 302                 ubi->avail_pebs -= i;
 303                 ubi->rsvd_pebs += i;
 304                 ubi->beb_rsvd_pebs += i;
 305                 if (i > 0)
 306                         ubi_msg("reserve more %d PEBs", i);
 307         }
 308         ubi->vol_count -= 1;
 309
 310         return 0;
 311 out_err:
 312         ubi_err(ubi, "cannot remove volume %s, error %d", volume, err);
 313         if (err < 0)
 314                 err = -err;
 315         return err;
 316 }
 317
 318 static int ubi_rename_vol(char *oldname, char *newname)
 319 {
 320         struct ubi_volume *vol;
 321         struct ubi_rename_entry rename;
 322         struct ubi_volume_desc desc;
 323         struct list_head list;
 324
 325         vol = ubi_find_volume(oldname);
 326         if (!vol) {
 327                 printf("%s: volume %s doesn't exist\n", __func__, oldname);
 328                 return ENODEV;
 329         }
 330
 331         if (!ubi_check(newname)) {
 332                 printf("%s: volume %s already exist\n", __func__, newname);
 333                 return EINVAL;
 334         }
 335
 336         printf("Rename UBI volume %s to %s\n", oldname, newname);
 337
 338         if (ubi->ro_mode) {
 339                 printf("%s: ubi device is in read-only mode\n", __func__);
 340                 return EROFS;
 341         }
 342
 343         rename.new_name_len = strlen(newname);
 344         strcpy(rename.new_name, newname);
 345         rename.remove = 0;
 346         desc.vol = vol;
 347         desc.mode = 0;
 348         rename.desc = &desc;
 349         INIT_LIST_HEAD(&rename.list);
 350         INIT_LIST_HEAD(&list);
 351         list_add(&rename.list, &list);
 352
 353         return ubi_rename_volumes(ubi, &list);
 354 }
 355
 356 static int ubi_volume_continue_write(char *volume, void *buf, size_t size)
 357 {
 358         int err = 1;
 359         struct ubi_volume *vol;
 360
 361         vol = ubi_find_volume(volume);
 362         if (vol == NULL)
 363                 return ENODEV;
 364
 365         err = ubi_more_update_data(ubi, vol, buf, size);
 366         if (err < 0) {
 367                 printf("Couldnt or partially wrote data\n");
 368                 return -err;
 369         }
 370
 371         if (err) {
 372                 size = err;
 373
 374                 err = ubi_check_volume(ubi, vol->vol_id);
 375                 if (err < 0)
 376                         return -err;
 377
 378                 if (err) {
 379                         ubi_warn(ubi, "volume %d on UBI device %d is corrupt",
 380                                  vol->vol_id, ubi->ubi_num);
 381                         vol->corrupted = 1;
 382                 }
 383
 384                 vol->checked = 1;
 385                 ubi_gluebi_updated(vol);
 386         }
 387
 388         return 0;
 389 }
 390
 391 int ubi_volume_begin_write(char *volume, void *buf, size_t size,
 392         size_t full_size)
 393 {
 394         int err = 1;
 395         int rsvd_bytes = 0;
 396         struct ubi_volume *vol;
 397
 398         vol = ubi_find_volume(volume);
 399         if (vol == NULL)
 400                 return ENODEV;
 401
 402         rsvd_bytes = vol->reserved_pebs * (ubi->leb_size - vol->data_pad);
 403         if (size > rsvd_bytes) {
 404                 printf("size > volume size! Aborting!\n");
 405                 return EINVAL;
 406         }
 407
 408         err = ubi_start_update(ubi, vol, full_size);
 409         if (err < 0) {
 410                 printf("Cannot start volume update\n");
 411                 return -err;
 412         }
 413
 414         return ubi_volume_continue_write(volume, buf, size);
 415 }
 416
 417 int ubi_volume_write(char *volume, void *buf, size_t size)
 418 {
 419         return ubi_volume_begin_write(volume, buf, size, size);
 420 }
 421
 422 int ubi_volume_read(char *volume, char *buf, size_t size)
 423 {
 424         int err, lnum, off, len, tbuf_size;
 425         void *tbuf;
 426         unsigned long long tmp;
 427         struct ubi_volume *vol;
 428         loff_t offp = 0;
 429         size_t len_read;
 430
 431         vol = ubi_find_volume(volume);
 432         if (vol == NULL)
 433                 return ENODEV;
 434
 435         if (vol->updating) {
 436                 printf("updating");
 437                 return EBUSY;
 438         }
 439         if (vol->upd_marker) {
 440                 printf("damaged volume, update marker is set");
 441                 return EBADF;
 442         }
 443         if (offp == vol->used_bytes)
 444                 return 0;
 445
 446         if (size == 0) {
 447                 printf("No size specified -> Using max size (%lld)\n", vol->used_bytes);
 448                 size = vol->used_bytes;
 449         }
 450
 451         printf("Read %zu bytes from volume %s to %p\n", size, volume, buf);
 452
 453         if (vol->corrupted)
 454                 printf("read from corrupted volume %d", vol->vol_id);
 455         if (offp + size > vol->used_bytes)
 456                 size = vol->used_bytes - offp;
 457
 458         tbuf_size = vol->usable_leb_size;
 459         if (size < tbuf_size)
 460                 tbuf_size = ALIGN(size, ubi->min_io_size);
 461         tbuf = malloc_cache_aligned(tbuf_size);
 462         if (!tbuf) {
 463                 printf("NO MEM\n");
 464                 return ENOMEM;
 465         }
 466         len = size > tbuf_size ? tbuf_size : size;
 467
 468         tmp = offp;
 469         off = do_div(tmp, vol->usable_leb_size);
 470         lnum = tmp;
 471         len_read = size;
 472         do {
 473                 if (off + len >= vol->usable_leb_size)
 474                         len = vol->usable_leb_size - off;
 475
 476                 err = ubi_eba_read_leb(ubi, vol, lnum, tbuf, off, len, 0);
 477                 if (err) {
 478                         printf("read err %x\n", err);
 479                         err = -err;
 480                         break;
 481                 }
 482                 off += len;
 483                 if (off == vol->usable_leb_size) {
 484                         lnum += 1;
 485                         off -= vol->usable_leb_size;
 486                 }
 487
 488                 size -= len;
 489                 offp += len;
 490
 491                 memcpy(buf, tbuf, len);
 492
 493                 buf += len;
 494                 len = size > tbuf_size ? tbuf_size : size;
 495         } while (size);
 496
 497         if (!size)
 498                 env_set_hex("filesize", len_read);
 499
 500         free(tbuf);
 501         return err;
 502 }
 503
 504 static int ubi_dev_scan(struct mtd_info *info, const char *vid_header_offset)
 505 {
 506         char ubi_mtd_param_buffer[80];
 507         int err;
 508
 509         if (!vid_header_offset)
 510                 sprintf(ubi_mtd_param_buffer, "%s", info->name);
 511         else
 512                 sprintf(ubi_mtd_param_buffer, "%s,%s", info->name,
 513                         vid_header_offset);
 514
 515         err = ubi_mtd_param_parse(ubi_mtd_param_buffer, NULL);
 516         if (err)
 517                 return -err;
 518
 519         err = ubi_init();
 520         if (err)
 521                 return -err;
 522
 523         return 0;
 524 }
 525
 526 static int ubi_set_skip_check(char *volume, bool skip_check)
 527 {
 528         struct ubi_vtbl_record vtbl_rec;
 529         struct ubi_volume *vol;
 530
 531         vol = ubi_find_volume(volume);
 532         if (!vol)
 533                 return ENODEV;
 534
 535         printf("%sing skip_check on volume %s\n",
 536                skip_check ? "Sett" : "Clear", volume);
 537
 538         vtbl_rec = ubi->vtbl[vol->vol_id];
 539         if (skip_check) {
 540                 vtbl_rec.flags |= UBI_VTBL_SKIP_CRC_CHECK_FLG;
 541                 vol->skip_check = 1;
 542         } else {
 543                 vtbl_rec.flags &= ~UBI_VTBL_SKIP_CRC_CHECK_FLG;
 544                 vol->skip_check = 0;
 545         }
 546
 547         return ubi_change_vtbl_record(ubi, vol->vol_id, &vtbl_rec);
 548 }
 549
 550 static int ubi_detach(void)
 551 {
 552 #ifdef CONFIG_CMD_UBIFS
 553         /*
 554          * Automatically unmount UBIFS partition when user
 555          * changes the UBI device. Otherwise the following
 556          * UBIFS commands will crash.
 557          */
 558         if (ubifs_is_mounted())
 559                 cmd_ubifs_umount();
 560 #endif
 561
 562         /*
 563          * Call ubi_exit() before re-initializing the UBI subsystem
 564          */
 565         if (ubi)
 566                 ubi_exit();
 567
 568         ubi = NULL;
 569
 570         return 0;
 571 }
 572
 573 int ubi_part(char *part_name, const char *vid_header_offset)
 574 {
 575         struct mtd_info *mtd;
 576         int err = 0;
 577
 578         if (ubi && ubi->mtd && !strcmp(ubi->mtd->name, part_name)) {
 579                 printf("UBI partition '%s' already selected\n", part_name);
 580                 return 0;
 581         }
 582
 583         ubi_detach();
 584
 585         mtd_probe_devices();
 586         mtd = get_mtd_device_nm(part_name);
 587         if (IS_ERR(mtd)) {
 588                 printf("Partition %s not found!\n", part_name);
 589                 return 1;
 590         }
 591         put_mtd_device(mtd);
 592
 593         err = ubi_dev_scan(mtd, vid_header_offset);
 594         if (err) {
 595                 printf("UBI init error %d\n", err);
 596                 printf("Please check, if the correct MTD partition is used (size big enough?)\n");
 597                 return err;
 598         }
 599
 600         ubi = ubi_devices[0];
 601
 602         return 0;
 603 }
 604
 605 static int do_ubi(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
 606 {
 607         int64_t size = 0;
 608         ulong addr = 0;
 609         bool skipcheck = false;
 610
 611         if (argc < 2)
 612                 return CMD_RET_USAGE;
 613
 614         if (strcmp(argv[1], "detach") == 0)
 615                 return ubi_detach();
 616
 617         if (strcmp(argv[1], "part") == 0) {
 618                 const char *vid_header_offset = NULL;
 619
 620                 /* Print current partition */
 621                 if (argc == 2) {
 622                         if (!ubi) {
 623                                 printf("Error, no UBI device selected!\n");
 624                                 return 1;
 625                         }
 626
 627                         printf("Device %d: %s, MTD partition %s\n",
 628                                ubi->ubi_num, ubi->ubi_name, ubi->mtd->name);
 629                         return 0;
 630                 }
 631
 632                 if (argc < 3)
 633                         return CMD_RET_USAGE;
 634
 635                 if (argc > 3)
 636                         vid_header_offset = argv[3];
 637
 638                 return ubi_part(argv[2], vid_header_offset);
 639         }
 640
 641         if ((strcmp(argv[1], "part") != 0) && !ubi) {
 642                 printf("Error, no UBI device selected!\n");
 643                 return 1;
 644         }
 645
 646         if (strcmp(argv[1], "info") == 0) {
 647                 int layout = 0;
 648                 if (argc > 2 && !strncmp(argv[2], "l", 1))
 649                         layout = 1;
 650                 return ubi_info(layout);
 651         }
 652
 653         if (strcmp(argv[1], "list") == 0) {
 654                 int numeric = 0;
 655                 if (argc >= 3 && argv[2][0] == '-') {
 656                         if (strcmp(argv[2], "-numeric") == 0)
 657                                 numeric = 1;
 658                         else
 659                                 return CMD_RET_USAGE;
 660                 }
 661                 if (!numeric && argc != 2 && argc != 3)
 662                         return CMD_RET_USAGE;
 663                 if (numeric && argc != 3 && argc != 4)
 664                         return CMD_RET_USAGE;
 665                 return ubi_list(argv[numeric ? 3 : 2], numeric);
 666         }
 667
 668         if (strcmp(argv[1], "check") == 0) {
 669                 if (argc > 2)
 670                         return ubi_check(argv[2]);
 671
 672                 printf("Error, no volume name passed\n");
 673                 return 1;
 674         }
 675
 676         if (strncmp(argv[1], "create", 6) == 0) {
 677                 int dynamic = 1;        /* default: dynamic volume */
 678                 int id = UBI_VOL_NUM_AUTO;
 679
 680                 /* Use maximum available size */
 681                 size = 0;
 682
 683                 /* E.g., create volume with "skipcheck" bit set */
 684                 if (argc == 7) {
 685                         skipcheck = strncmp(argv[6], "--skipcheck", 11) == 0;
 686                         argc--;
 687                 }
 688
 689                 /* E.g., create volume size type vol_id */
 690                 if (argc == 6) {
 691                         id = simple_strtoull(argv[5], NULL, 16);
 692                         argc--;
 693                 }
 694
 695                 /* E.g., create volume size type */
 696                 if (argc == 5) {
 697                         if (strncmp(argv[4], "s", 1) == 0)
 698                                 dynamic = 0;
 699                         else if (strncmp(argv[4], "d", 1) != 0) {
 700                                 printf("Incorrect type\n");
 701                                 return 1;
 702                         }
 703                         argc--;
 704                 }
 705                 /* E.g., create volume size */
 706                 if (argc == 4) {
 707                         if (argv[3][0] != '-')
 708                                 size = simple_strtoull(argv[3], NULL, 16);
 709                         argc--;
 710                 }
 711                 /* Use maximum available size */
 712                 if (!size) {
 713                         size = (int64_t)ubi->avail_pebs * ubi->leb_size;
 714                         printf("No size specified -> Using max size (%lld)\n", size);
 715                 }
 716                 /* E.g., create volume */
 717                 if (argc == 3) {
 718                         return ubi_create_vol(argv[2], size, dynamic, id,
 719                                               skipcheck);
 720                 }
 721         }
 722
 723         if (strncmp(argv[1], "remove", 6) == 0) {
 724                 /* E.g., remove volume */
 725                 if (argc == 3)
 726                         return ubi_remove_vol(argv[2]);
 727         }
 728
 729         if (IS_ENABLED(CONFIG_CMD_UBI_RENAME) && !strncmp(argv[1], "rename", 6))
 730                 return ubi_rename_vol(argv[2], argv[3]);
 731
 732         if (strncmp(argv[1], "skipcheck", 9) == 0) {
 733                 /* E.g., change skip_check flag */
 734                 if (argc == 4) {
 735                         skipcheck = strncmp(argv[3], "on", 2) == 0;
 736                         return ubi_set_skip_check(argv[2], skipcheck);
 737                 }
 738         }
 739
 740         if (strncmp(argv[1], "write", 5) == 0) {
 741                 int ret;
 742
 743                 if (argc < 5) {
 744                         printf("Please see usage\n");
 745                         return 1;
 746                 }
 747
 748                 addr = hextoul(argv[2], NULL);
 749                 size = hextoul(argv[4], NULL);
 750
 751                 if (strlen(argv[1]) == 10 &&
 752                     strncmp(argv[1] + 5, ".part", 5) == 0) {
 753                         if (argc < 6) {
 754                                 ret = ubi_volume_continue_write(argv[3],
 755                                                 (void *)addr, size);
 756                         } else {
 757                                 size_t full_size;
 758                                 full_size = hextoul(argv[5], NULL);
 759                                 ret = ubi_volume_begin_write(argv[3],
 760                                                 (void *)addr, size, full_size);
 761                         }
 762                 } else {
 763                         ret = ubi_volume_write(argv[3], (void *)addr, size);
 764                 }
 765                 if (!ret) {
 766                         printf("%lld bytes written to volume %s\n", size,
 767                                argv[3]);
 768                 }
 769
 770                 return ret;
 771         }
 772
 773         if (strncmp(argv[1], "read", 4) == 0) {
 774                 size = 0;
 775
 776                 /* E.g., read volume size */
 777                 if (argc == 5) {
 778                         size = hextoul(argv[4], NULL);
 779                         argc--;
 780                 }
 781
 782                 /* E.g., read volume */
 783                 if (argc == 4) {
 784                         addr = hextoul(argv[2], NULL);
 785                         argc--;
 786                 }
 787
 788                 if (argc == 3) {
 789                         return ubi_volume_read(argv[3], (char *)addr, size);
 790                 }
 791         }
 792
 793         printf("Please see usage\n");
 794         return 1;
 795 }
 796
 797 U_BOOT_CMD(
 798         ubi, 7, 1, do_ubi,
 799         "ubi commands",
 800         "detach"
 801                 " - detach ubi from a mtd partition\n"
 802         "ubi part [part] [offset]\n"
 803                 " - Show or set current partition (with optional VID"
 804                 " header offset)\n"
 805         "ubi info [l[ayout]]"
 806                 " - Display volume and ubi layout information\n"
 807         "ubi list [flags]"
 808                 " - print the list of volumes\n"
 809         "ubi list [flags] <varname>"
 810                 " - set environment variable to the list of volumes"
 811                 " (flags can be -numeric)\n"
 812         "ubi check volumename"
 813                 " - check if volumename exists\n"
 814         "ubi create[vol] volume [size] [type] [id] [--skipcheck]\n"
 815                 " - create volume name with size ('-' for maximum"
 816                 " available size)\n"
 817         "ubi write[vol] address volume size"
 818                 " - Write volume from address with size\n"
 819         "ubi write.part address volume size [fullsize]\n"
 820                 " - Write part of a volume from address\n"
 821         "ubi read[vol] address volume [size]"
 822                 " - Read volume to address with size\n"
 823         "ubi remove[vol] volume"
 824                 " - Remove volume\n"
 825 #if IS_ENABLED(CONFIG_CMD_UBI_RENAME)
 826         "ubi rename oldname newname\n"
 827 #endif
 828         "ubi skipcheck volume on/off - Set or clear skip_check flag in volume header\n"
 829         "[Legends]\n"
 830         " volume: character name\n"
 831         " size: specified in bytes\n"
 832         " type: s[tatic] or d[ynamic] (default=dynamic)"
 833 );