common/cmd_fdt.c

   1 /*
   2  * (C) Copyright 2007
   3  * Gerald Van Baren, Custom IDEAS, vanbaren@cideas.com
   4  * Based on code written by:
   5  *   Pantelis Antoniou <pantelis.antoniou@gmail.com> and
   6  *   Matthew McClintock <msm@freescale.com>
   7  *
   8  * See file CREDITS for list of people who contributed to this
   9  * project.
  10  *
  11  * This program is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU General Public License as
  13  * published by the Free Software Foundation; either version 2 of
  14  * the License, or (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  24  * MA 02111-1307 USA
  25  */
  26
  27 #include <common.h>
  28 #include <command.h>
  29 #include <linux/ctype.h>
  30 #include <linux/types.h>
  31 #include <asm/global_data.h>
  32 #include <fdt.h>
  33 #include <libfdt.h>
  34 #include <fdt_support.h>
  35
  36 #define MAX_LEVEL       32              /* how deeply nested we will go */
  37 #define SCRATCHPAD      1024            /* bytes of scratchpad memory */
  38
  39 /*
  40  * Global data (for the gd->bd)
  41  */
  42 DECLARE_GLOBAL_DATA_PTR;
  43
  44 static int fdt_valid(void);
  45 static int fdt_parse_prop(char *pathp, char *prop, char *newval,
  46         char *data, int *len);
  47 static int fdt_print(const char *pathp, char *prop, int depth);
  48
  49 /*
  50  * Flattened Device Tree command, see the help for parameter definitions.
  51  */
  52 int do_fdt (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
  53 {
  54         if (argc < 2) {
  55                 printf ("Usage:\n%s\n", cmdtp->usage);
  56                 return 1;
  57         }
  58
  59         /********************************************************************
  60          * Set the address of the fdt
  61          ********************************************************************/
  62         if (argv[1][0] == 'a') {
  63                 /*
  64                  * Set the address [and length] of the fdt.
  65                  */
  66                 fdt = (struct fdt_header *)simple_strtoul(argv[2], NULL, 16);
  67
  68                 if (!fdt_valid()) {
  69                         return 1;
  70                 }
  71
  72                 if (argc >= 4) {
  73                         int  len;
  74                         int  err;
  75                         /*
  76                          * Optional new length
  77                          */
  78                         len = simple_strtoul(argv[3], NULL, 16);
  79                         if (len < fdt_totalsize(fdt)) {
  80                                 printf ("New length %d < existing length %d, "
  81                                         "ignoring.\n",
  82                                         len, fdt_totalsize(fdt));
  83                         } else {
  84                                 /*
  85                                  * Open in place with a new length.
  86                                  */
  87                                 err = fdt_open_into(fdt, fdt, len);
  88                                 if (err != 0) {
  89                                         printf ("libfdt fdt_open_into(): %s\n",
  90                                                 fdt_strerror(err));
  91                                 }
  92                         }
  93                 }
  94
  95         /********************************************************************
  96          * Move the fdt
  97          ********************************************************************/
  98         } else if ((argv[1][0] == 'm') && (argv[1][1] == 'o')) {
  99                 struct fdt_header *newaddr;
 100                 int  len;
 101                 int  err;
 102
 103                 if (argc < 4) {
 104                         printf ("Usage:\n%s\n", cmdtp->usage);
 105                         return 1;
 106                 }
 107
 108                 /*
 109                  * Set the address and length of the fdt.
 110                  */
 111                 fdt = (struct fdt_header *)simple_strtoul(argv[2], NULL, 16);
 112                 if (!fdt_valid()) {
 113                         return 1;
 114                 }
 115
 116                 newaddr = (struct fdt_header *)simple_strtoul(argv[3],NULL,16);
 117
 118                 /*
 119                  * If the user specifies a length, use that.  Otherwise use the
 120                  * current length.
 121                  */
 122                 if (argc <= 4) {
 123                         len = fdt_totalsize(fdt);
 124                 } else {
 125                         len = simple_strtoul(argv[4], NULL, 16);
 126                         if (len < fdt_totalsize(fdt)) {
 127                                 printf ("New length 0x%X < existing length "
 128                                         "0x%X, aborting.\n",
 129                                         len, fdt_totalsize(fdt));
 130                                 return 1;
 131                         }
 132                 }
 133
 134                 /*
 135                  * Copy to the new location.
 136                  */
 137                 err = fdt_open_into(fdt, newaddr, len);
 138                 if (err != 0) {
 139                         printf ("libfdt fdt_open_into(): %s\n",
 140                                 fdt_strerror(err));
 141                         return 1;
 142                 }
 143                 fdt = newaddr;
 144
 145         /********************************************************************
 146          * Make a new node
 147          ********************************************************************/
 148         } else if ((argv[1][0] == 'm') && (argv[1][1] == 'k')) {
 149                 char *pathp;            /* path */
 150                 char *nodep;            /* new node to add */
 151                 int  nodeoffset;        /* node offset from libfdt */
 152                 int  err;
 153
 154                 /*
 155                  * Parameters: Node path, new node to be appended to the path.
 156                  */
 157                 if (argc < 4) {
 158                         printf ("Usage:\n%s\n", cmdtp->usage);
 159                         return 1;
 160                 }
 161
 162                 pathp = argv[2];
 163                 nodep = argv[3];
 164
 165                 nodeoffset = fdt_path_offset (fdt, pathp);
 166                 if (nodeoffset < 0) {
 167                         /*
 168                          * Not found or something else bad happened.
 169                          */
 170                         printf ("libfdt fdt_path_offset() returned %s\n",
 171                                 fdt_strerror(nodeoffset));
 172                         return 1;
 173                 }
 174                 err = fdt_add_subnode(fdt, nodeoffset, nodep);
 175                 if (err < 0) {
 176                         printf ("libfdt fdt_add_subnode(): %s\n",
 177                                 fdt_strerror(err));
 178                         return 1;
 179                 }
 180
 181         /********************************************************************
 182          * Set the value of a property in the fdt.
 183          ********************************************************************/
 184         } else if (argv[1][0] == 's') {
 185                 char *pathp;            /* path */
 186                 char *prop;             /* property */
 187                 int  nodeoffset;        /* node offset from libfdt */
 188                 static char data[SCRATCHPAD];   /* storage for the property */
 189                 int  len;               /* new length of the property */
 190                 int  ret;               /* return value */
 191
 192                 /*
 193                  * Parameters: Node path, property, optional value.
 194                  */
 195                 if (argc < 4) {
 196                         printf ("Usage:\n%s\n", cmdtp->usage);
 197                         return 1;
 198                 }
 199
 200                 pathp  = argv[2];
 201                 prop   = argv[3];
 202                 if (argc == 4) {
 203                         len = 0;
 204                 } else {
 205                         ret = fdt_parse_prop(pathp, prop, argv[4], data, &len);
 206                         if (ret != 0)
 207                                 return ret;
 208                 }
 209
 210                 nodeoffset = fdt_path_offset (fdt, pathp);
 211                 if (nodeoffset < 0) {
 212                         /*
 213                          * Not found or something else bad happened.
 214                          */
 215                         printf ("libfdt fdt_path_offset() returned %s\n",
 216                                 fdt_strerror(nodeoffset));
 217                         return 1;
 218                 }
 219
 220                 ret = fdt_setprop(fdt, nodeoffset, prop, data, len);
 221                 if (ret < 0) {
 222                         printf ("libfdt fdt_setprop(): %s\n", fdt_strerror(ret));
 223                         return 1;
 224                 }
 225
 226         /********************************************************************
 227          * Print (recursive) / List (single level)
 228          ********************************************************************/
 229         } else if ((argv[1][0] == 'p') || (argv[1][0] == 'l')) {
 230                 int depth = MAX_LEVEL;  /* how deep to print */
 231                 char *pathp;            /* path */
 232                 char *prop;             /* property */
 233                 int  ret;               /* return value */
 234                 static char root[2] = "/";
 235
 236                 /*
 237                  * list is an alias for print, but limited to 1 level
 238                  */
 239                 if (argv[1][0] == 'l') {
 240                         depth = 1;
 241                 }
 242
 243                 /*
 244                  * Get the starting path.  The root node is an oddball,
 245                  * the offset is zero and has no name.
 246                  */
 247                 if (argc == 2)
 248                         pathp = root;
 249                 else
 250                         pathp = argv[2];
 251                 if (argc > 3)
 252                         prop = argv[3];
 253                 else
 254                         prop = NULL;
 255
 256                 ret = fdt_print(pathp, prop, depth);
 257                 if (ret != 0)
 258                         return ret;
 259
 260         /********************************************************************
 261          * Remove a property/node
 262          ********************************************************************/
 263         } else if ((argv[1][0] == 'r') && (argv[1][1] == 'm')) {
 264                 int  nodeoffset;        /* node offset from libfdt */
 265                 int  err;
 266
 267                 /*
 268                  * Get the path.  The root node is an oddball, the offset
 269                  * is zero and has no name.
 270                  */
 271                 nodeoffset = fdt_path_offset (fdt, argv[2]);
 272                 if (nodeoffset < 0) {
 273                         /*
 274                          * Not found or something else bad happened.
 275                          */
 276                         printf ("libfdt fdt_path_offset() returned %s\n",
 277                                 fdt_strerror(nodeoffset));
 278                         return 1;
 279                 }
 280                 /*
 281                  * Do the delete.  A fourth parameter means delete a property,
 282                  * otherwise delete the node.
 283                  */
 284                 if (argc > 3) {
 285                         err = fdt_delprop(fdt, nodeoffset, argv[3]);
 286                         if (err < 0) {
 287                                 printf("libfdt fdt_delprop():  %s\n",
 288                                         fdt_strerror(err));
 289                                 return err;
 290                         }
 291                 } else {
 292                         err = fdt_del_node(fdt, nodeoffset);
 293                         if (err < 0) {
 294                                 printf("libfdt fdt_del_node():  %s\n",
 295                                         fdt_strerror(err));
 296                                 return err;
 297                         }
 298                 }
 299
 300         /********************************************************************
 301          * Display header info
 302          ********************************************************************/
 303         } else if (argv[1][0] == 'h') {
 304                 u32 version = fdt_version(fdt);
 305                 printf("magic:\t\t\t0x%x\n", fdt_magic(fdt));
 306                 printf("totalsize:\t\t0x%x (%d)\n", fdt_totalsize(fdt), fdt_totalsize(fdt));
 307                 printf("off_dt_struct:\t\t0x%x\n", fdt_off_dt_struct(fdt));
 308                 printf("off_dt_strings:\t\t0x%x\n", fdt_off_dt_strings(fdt));
 309                 printf("off_mem_rsvmap:\t\t0x%x\n", fdt_off_mem_rsvmap(fdt));
 310                 printf("version:\t\t%d\n", version);
 311                 printf("last_comp_version:\t%d\n", fdt_last_comp_version(fdt));
 312                 if (version >= 2)
 313                         printf("boot_cpuid_phys:\t0x%x\n",
 314                                 fdt_boot_cpuid_phys(fdt));
 315                 if (version >= 3)
 316                         printf("size_dt_strings:\t0x%x\n",
 317                                 fdt_size_dt_strings(fdt));
 318                 if (version >= 17)
 319                         printf("size_dt_struct:\t\t0x%x\n",
 320                                 fdt_size_dt_struct(fdt));
 321                 printf("number mem_rsv:\t\t0x%x\n", fdt_num_mem_rsv(fdt));
 322                 printf("\n");
 323
 324         /********************************************************************
 325          * Set boot cpu id
 326          ********************************************************************/
 327         } else if ((argv[1][0] == 'b') && (argv[1][1] == 'o')) {
 328                 unsigned long tmp = simple_strtoul(argv[2], NULL, 16);
 329                 fdt_set_boot_cpuid_phys(fdt, tmp);
 330
 331         /********************************************************************
 332          * memory command
 333          ********************************************************************/
 334         } else if ((argv[1][0] == 'm') && (argv[1][1] == 'e')) {
 335                 uint64_t addr, size;
 336                 int err;
 337 #ifdef CFG_64BIT_STRTOUL
 338                         addr = simple_strtoull(argv[2], NULL, 16);
 339                         size = simple_strtoull(argv[3], NULL, 16);
 340 #else
 341                         addr = simple_strtoul(argv[2], NULL, 16);
 342                         size = simple_strtoul(argv[3], NULL, 16);
 343 #endif
 344                 err = fdt_fixup_memory(fdt, addr, size);
 345                 if (err < 0)
 346                         return err;
 347
 348         /********************************************************************
 349          * mem reserve commands
 350          ********************************************************************/
 351         } else if ((argv[1][0] == 'r') && (argv[1][1] == 's')) {
 352                 if (argv[2][0] == 'p') {
 353                         uint64_t addr, size;
 354                         int total = fdt_num_mem_rsv(fdt);
 355                         int j, err;
 356                         printf("index\t\t   start\t\t    size\n");
 357                         printf("-------------------------------"
 358                                 "-----------------\n");
 359                         for (j = 0; j < total; j++) {
 360                                 err = fdt_get_mem_rsv(fdt, j, &addr, &size);
 361                                 if (err < 0) {
 362                                         printf("libfdt fdt_get_mem_rsv():  %s\n",
 363                                                         fdt_strerror(err));
 364                                         return err;
 365                                 }
 366                                 printf("    %x\t%08x%08x\t%08x%08x\n", j,
 367                                         (u32)(addr >> 32),
 368                                         (u32)(addr & 0xffffffff),
 369                                         (u32)(size >> 32),
 370                                         (u32)(size & 0xffffffff));
 371                         }
 372                 } else if (argv[2][0] == 'a') {
 373                         uint64_t addr, size;
 374                         int err;
 375 #ifdef CFG_64BIT_STRTOUL
 376                         addr = simple_strtoull(argv[3], NULL, 16);
 377                         size = simple_strtoull(argv[4], NULL, 16);
 378 #else
 379                         addr = simple_strtoul(argv[3], NULL, 16);
 380                         size = simple_strtoul(argv[4], NULL, 16);
 381 #endif
 382                         err = fdt_add_mem_rsv(fdt, addr, size);
 383
 384                         if (err < 0) {
 385                                 printf("libfdt fdt_add_mem_rsv():  %s\n",
 386                                         fdt_strerror(err));
 387                                 return err;
 388                         }
 389                 } else if (argv[2][0] == 'd') {
 390                         unsigned long idx = simple_strtoul(argv[3], NULL, 16);
 391                         int err = fdt_del_mem_rsv(fdt, idx);
 392
 393                         if (err < 0) {
 394                                 printf("libfdt fdt_del_mem_rsv():  %s\n",
 395                                         fdt_strerror(err));
 396                                 return err;
 397                         }
 398                 } else {
 399                         /* Unrecognized command */
 400                         printf ("Usage:\n%s\n", cmdtp->usage);
 401                         return 1;
 402                 }
 403         }
 404 #ifdef CONFIG_OF_BOARD_SETUP
 405         /* Call the board-specific fixup routine */
 406         else if (argv[1][0] == 'b')
 407                 ft_board_setup(fdt, gd->bd);
 408 #endif
 409         /* Create a chosen node */
 410         else if (argv[1][0] == 'c')
 411                 fdt_chosen(fdt, 0, 0, 1);
 412
 413 #ifdef CONFIG_OF_HAS_UBOOT_ENV
 414         /* Create a u-boot-env node */
 415         else if (argv[1][0] == 'e')
 416                 fdt_env(fdt);
 417 #endif
 418 #ifdef CONFIG_OF_HAS_BD_T
 419         /* Create a bd_t node */
 420         else if (argv[1][0] == 'b')
 421                 fdt_bd_t(fdt);
 422 #endif
 423         else {
 424                 /* Unrecognized command */
 425                 printf ("Usage:\n%s\n", cmdtp->usage);
 426                 return 1;
 427         }
 428
 429         return 0;
 430 }
 431
 432 /****************************************************************************/
 433
 434 static int fdt_valid(void)
 435 {
 436         int  err;
 437
 438         if (fdt == NULL) {
 439                 printf ("The address of the fdt is invalid (NULL).\n");
 440                 return 0;
 441         }
 442
 443         err = fdt_check_header(fdt);
 444         if (err == 0)
 445                 return 1;       /* valid */
 446
 447         if (err < 0) {
 448                 printf("libfdt fdt_check_header(): %s", fdt_strerror(err));
 449                 /*
 450                  * Be more informative on bad version.
 451                  */
 452                 if (err == -FDT_ERR_BADVERSION) {
 453                         if (fdt_version(fdt) < FDT_FIRST_SUPPORTED_VERSION) {
 454                                 printf (" - too old, fdt $d < %d",
 455                                         fdt_version(fdt),
 456                                         FDT_FIRST_SUPPORTED_VERSION);
 457                                 fdt = NULL;
 458                         }
 459                         if (fdt_last_comp_version(fdt) > FDT_LAST_SUPPORTED_VERSION) {
 460                                 printf (" - too new, fdt $d > %d",
 461                                         fdt_version(fdt),
 462                                         FDT_LAST_SUPPORTED_VERSION);
 463                                 fdt = NULL;
 464                         }
 465                         return 0;
 466                 }
 467                 printf("\n");
 468                 return 0;
 469         }
 470         return 1;
 471 }
 472
 473 /****************************************************************************/
 474
 475 /*
 476  * Parse the user's input, partially heuristic.  Valid formats:
 477  * <00>         - hex byte
 478  * <0011>       - hex half word (16 bits)
 479  * <00112233>   - hex word (32 bits)
 480  *              - hex double words (64 bits) are not supported, must use
 481  *                      a byte stream instead.
 482  * [00 11 22 .. nn] - byte stream
 483  * "string"     - If the the value doesn't start with "<" or "[", it is
 484  *                      treated as a string.  Note that the quotes are
 485  *                      stripped by the parser before we get the string.
 486  */
 487 static int fdt_parse_prop(char *pathp, char *prop, char *newval,
 488         char *data, int *len)
 489 {
 490         char *cp;               /* temporary char pointer */
 491         unsigned long tmp;      /* holds converted values */
 492
 493         if (*newval == '<') {
 494                 /*
 495                  * Bigger values than bytes.
 496                  */
 497                 *len = 0;
 498                 newval++;
 499                 while ((*newval != '>') && (*newval != '\0')) {
 500                         cp = newval;
 501                         tmp = simple_strtoul(cp, &newval, 16);
 502                         if ((newval - cp) <= 2) {
 503                                 *data = tmp & 0xFF;
 504                                 data  += 1;
 505                                 *len += 1;
 506                         } else if ((newval - cp) <= 4) {
 507                                 *(uint16_t *)data = __cpu_to_be16(tmp);
 508                                 data  += 2;
 509                                 *len += 2;
 510                         } else if ((newval - cp) <= 8) {
 511                                 *(uint32_t *)data = __cpu_to_be32(tmp);
 512                                 data  += 4;
 513                                 *len += 4;
 514                         } else {
 515                                 printf("Sorry, I could not convert \"%s\"\n",
 516                                         cp);
 517                                 return 1;
 518                         }
 519                         while (*newval == ' ')
 520                                 newval++;
 521                 }
 522                 if (*newval != '>') {
 523                         printf("Unexpected character '%c'\n", *newval);
 524                         return 1;
 525                 }
 526         } else if (*newval == '[') {
 527                 /*
 528                  * Byte stream.  Convert the values.
 529                  */
 530                 *len = 0;
 531                 newval++;
 532                 while ((*newval != ']') && (*newval != '\0')) {
 533                         tmp = simple_strtoul(newval, &newval, 16);
 534                         *data++ = tmp & 0xFF;
 535                         *len    = *len + 1;
 536                         while (*newval == ' ')
 537                                 newval++;
 538                 }
 539                 if (*newval != ']') {
 540                         printf("Unexpected character '%c'\n", *newval);
 541                         return 1;
 542                 }
 543         } else {
 544                 /*
 545                  * Assume it is a string.  Copy it into our data area for
 546                  * convenience (including the terminating '\0').
 547                  */
 548                 *len = strlen(newval) + 1;
 549                 strcpy(data, newval);
 550         }
 551         return 0;
 552 }
 553
 554 /****************************************************************************/
 555
 556 /*
 557  * Heuristic to guess if this is a string or concatenated strings.
 558  */
 559
 560 static int is_printable_string(const void *data, int len)
 561 {
 562         const char *s = data;
 563
 564         /* zero length is not */
 565         if (len == 0)
 566                 return 0;
 567
 568         /* must terminate with zero */
 569         if (s[len - 1] != '\0')
 570                 return 0;
 571
 572         /* printable or a null byte (concatenated strings) */
 573         while (((*s == '\0') || isprint(*s)) && (len > 0)) {
 574                 /*
 575                  * If we see a null, there are three possibilities:
 576                  * 1) If len == 1, it is the end of the string, printable
 577                  * 2) Next character also a null, not printable.
 578                  * 3) Next character not a null, continue to check.
 579                  */
 580                 if (s[0] == '\0') {
 581                         if (len == 1)
 582                                 return 1;
 583                         if (s[1] == '\0')
 584                                 return 0;
 585                 }
 586                 s++;
 587                 len--;
 588         }
 589
 590         /* Not the null termination, or not done yet: not printable */
 591         if (*s != '\0' || (len != 0))
 592                 return 0;
 593
 594         return 1;
 595 }
 596
 597
 598 /*
 599  * Print the property in the best format, a heuristic guess.  Print as
 600  * a string, concatenated strings, a byte, word, double word, or (if all
 601  * else fails) it is printed as a stream of bytes.
 602  */
 603 static void print_data(const void *data, int len)
 604 {
 605         int j;
 606         const u8 *s;
 607
 608         /* no data, don't print */
 609         if (len == 0)
 610                 return;
 611
 612         /*
 613          * It is a string, but it may have multiple strings (embedded '\0's).
 614          */
 615         if (is_printable_string(data, len)) {
 616                 puts("\"");
 617                 j = 0;
 618                 while (j < len) {
 619                         if (j > 0)
 620                                 puts("\", \"");
 621                         puts(data);
 622                         j    += strlen(data) + 1;
 623                         data += strlen(data) + 1;
 624                 }
 625                 puts("\"");
 626                 return;
 627         }
 628
 629         switch (len) {
 630         case 1:  /* byte */
 631                 printf("<0x%02x>", (*(u8 *) data) & 0xff);
 632                 break;
 633         case 2:  /* half-word */
 634                 printf("<0x%04x>", be16_to_cpu(*(u16 *) data) & 0xffff);
 635                 break;
 636         case 4:  /* word */
 637                 printf("<0x%08x>", be32_to_cpu(*(u32 *) data) & 0xffffffffU);
 638                 break;
 639         case 8:  /* double-word */
 640 #if __WORDSIZE == 64
 641                 printf("<0x%016llx>", be64_to_cpu(*(uint64_t *) data));
 642 #else
 643                 printf("<0x%08x ", be32_to_cpu(*(u32 *) data) & 0xffffffffU);
 644                 data += 4;
 645                 printf("0x%08x>", be32_to_cpu(*(u32 *) data) & 0xffffffffU);
 646 #endif
 647                 break;
 648         default:                /* anything else... hexdump */
 649                 printf("[");
 650                 for (j = 0, s = data; j < len; j++)
 651                         printf("%02x%s", s[j], j < len - 1 ? " " : "");
 652                 printf("]");
 653
 654                 break;
 655         }
 656 }
 657
 658 /****************************************************************************/
 659
 660 /*
 661  * Recursively print (a portion of) the fdt.  The depth parameter
 662  * determines how deeply nested the fdt is printed.
 663  */
 664 static int fdt_print(const char *pathp, char *prop, int depth)
 665 {
 666         static char tabs[MAX_LEVEL+1] =
 667                 "\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t"
 668                 "\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t";
 669         const void *nodep;      /* property node pointer */
 670         int  nodeoffset;        /* node offset from libfdt */
 671         int  nextoffset;        /* next node offset from libfdt */
 672         uint32_t tag;           /* tag */
 673         int  len;               /* length of the property */
 674         int  level = 0;         /* keep track of nesting level */
 675         const struct fdt_property *fdt_prop;
 676
 677         nodeoffset = fdt_path_offset (fdt, pathp);
 678         if (nodeoffset < 0) {
 679                 /*
 680                  * Not found or something else bad happened.
 681                  */
 682                 printf ("libfdt fdt_path_offset() returned %s\n",
 683                         fdt_strerror(nodeoffset));
 684                 return 1;
 685         }
 686         /*
 687          * The user passed in a property as well as node path.
 688          * Print only the given property and then return.
 689          */
 690         if (prop) {
 691                 nodep = fdt_getprop (fdt, nodeoffset, prop, &len);
 692                 if (len == 0) {
 693                         /* no property value */
 694                         printf("%s %s\n", pathp, prop);
 695                         return 0;
 696                 } else if (len > 0) {
 697                         printf("%s = ", prop);
 698                         print_data (nodep, len);
 699                         printf("\n");
 700                         return 0;
 701                 } else {
 702                         printf ("libfdt fdt_getprop(): %s\n",
 703                                 fdt_strerror(len));
 704                         return 1;
 705                 }
 706         }
 707
 708         /*
 709          * The user passed in a node path and no property,
 710          * print the node and all subnodes.
 711          */
 712         while(level >= 0) {
 713                 tag = fdt_next_tag(fdt, nodeoffset, &nextoffset);
 714                 switch(tag) {
 715                 case FDT_BEGIN_NODE:
 716                         pathp = fdt_get_name(fdt, nodeoffset, NULL);
 717                         if (level <= depth) {
 718                                 if (pathp == NULL)
 719                                         pathp = "/* NULL pointer error */";
 720                                 if (*pathp == '\0')
 721                                         pathp = "/";    /* root is nameless */
 722                                 printf("%s%s {\n",
 723                                         &tabs[MAX_LEVEL - level], pathp);
 724                         }
 725                         level++;
 726                         if (level >= MAX_LEVEL) {
 727                                 printf("Nested too deep, aborting.\n");
 728                                 return 1;
 729                         }
 730                         break;
 731                 case FDT_END_NODE:
 732                         level--;
 733                         if (level <= depth)
 734                                 printf("%s};\n", &tabs[MAX_LEVEL - level]);
 735                         if (level == 0) {
 736                                 level = -1;             /* exit the loop */
 737                         }
 738                         break;
 739                 case FDT_PROP:
 740                         fdt_prop = fdt_offset_ptr(fdt, nodeoffset,
 741                                         sizeof(*fdt_prop));
 742                         pathp    = fdt_string(fdt,
 743                                         fdt32_to_cpu(fdt_prop->nameoff));
 744                         len      = fdt32_to_cpu(fdt_prop->len);
 745                         nodep    = fdt_prop->data;
 746                         if (len < 0) {
 747                                 printf ("libfdt fdt_getprop(): %s\n",
 748                                         fdt_strerror(len));
 749                                 return 1;
 750                         } else if (len == 0) {
 751                                 /* the property has no value */
 752                                 if (level <= depth)
 753                                         printf("%s%s;\n",
 754                                                 &tabs[MAX_LEVEL - level],
 755                                                 pathp);
 756                         } else {
 757                                 if (level <= depth) {
 758                                         printf("%s%s = ",
 759                                                 &tabs[MAX_LEVEL - level],
 760                                                 pathp);
 761                                         print_data (nodep, len);
 762                                         printf(";\n");
 763                                 }
 764                         }
 765                         break;
 766                 case FDT_NOP:
 767                         printf("/* NOP */\n", &tabs[MAX_LEVEL - level]);
 768                         break;
 769                 case FDT_END:
 770                         return 1;
 771                 default:
 772                         if (level <= depth)
 773                                 printf("Unknown tag 0x%08X\n", tag);
 774                         return 1;
 775                 }
 776                 nodeoffset = nextoffset;
 777         }
 778         return 0;
 779 }
 780
 781 /********************************************************************/
 782
 783 U_BOOT_CMD(
 784         fdt,    5,      0,      do_fdt,
 785         "fdt     - flattened device tree utility commands\n",
 786             "addr   <addr> [<length>]        - Set the fdt location to <addr>\n"
 787 #ifdef CONFIG_OF_BOARD_SETUP
 788         "fdt boardsetup                      - Do board-specific set up\n"
 789 #endif
 790         "fdt move   <fdt> <newaddr> <length> - Copy the fdt to <addr> and make it active\n"
 791         "fdt print  <path> [<prop>]          - Recursive print starting at <path>\n"
 792         "fdt list   <path> [<prop>]          - Print one level starting at <path>\n"
 793         "fdt set    <path> <prop> [<val>]    - Set <property> [to <val>]\n"
 794         "fdt mknode <path> <node>            - Create a new node after <path>\n"
 795         "fdt rm     <path> [<prop>]          - Delete the node or <property>\n"
 796         "fdt header                          - Display header info\n"
 797         "fdt bootcpu <id>                    - Set boot cpuid\n"
 798         "fdt memory <addr> <size>            - Add/Update memory node\n"
 799         "fdt rsvmem print                    - Show current mem reserves\n"
 800         "fdt rsvmem add <addr> <size>        - Add a mem reserve\n"
 801         "fdt rsvmem delete <index>           - Delete a mem reserves\n"
 802         "fdt chosen - Add/update the /chosen branch in the tree\n"
 803 #ifdef CONFIG_OF_HAS_UBOOT_ENV
 804         "fdt env    - Add/replace the /u-boot-env branch in the tree\n"
 805 #endif
 806 #ifdef CONFIG_OF_HAS_BD_T
 807         "fdt bd_t   - Add/replace the /bd_t branch in the tree\n"
 808 #endif
 809         "NOTE: If the path or property you are setting/printing has a '#' character\n"
 810         "     or spaces, you MUST escape it with a \\ character or quote it with \".\n"
 811 );