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 **newval, int count, char *data, int *len);
  46 static int fdt_print(const char *pathp, char *prop, int depth);
  47
  48 /*
  49  * Flattened Device Tree command, see the help for parameter definitions.
  50  */
  51 int do_fdt (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
  52 {
  53         if (argc < 2) {
  54                 printf ("Usage:\n%s\n", cmdtp->usage);
  55                 return 1;
  56         }
  57
  58         /********************************************************************
  59          * Set the address of the fdt
  60          ********************************************************************/
  61         if (argv[1][0] == 'a') {
  62                 /*
  63                  * Set the address [and length] of the fdt.
  64                  */
  65                 fdt = (struct fdt_header *)simple_strtoul(argv[2], NULL, 16);
  66
  67                 if (!fdt_valid()) {
  68                         return 1;
  69                 }
  70
  71                 if (argc >= 4) {
  72                         int  len;
  73                         int  err;
  74                         /*
  75                          * Optional new length
  76                          */
  77                         len = simple_strtoul(argv[3], NULL, 16);
  78                         if (len < fdt_totalsize(fdt)) {
  79                                 printf ("New length %d < existing length %d, "
  80                                         "ignoring.\n",
  81                                         len, fdt_totalsize(fdt));
  82                         } else {
  83                                 /*
  84                                  * Open in place with a new length.
  85                                  */
  86                                 err = fdt_open_into(fdt, fdt, len);
  87                                 if (err != 0) {
  88                                         printf ("libfdt fdt_open_into(): %s\n",
  89                                                 fdt_strerror(err));
  90                                 }
  91                         }
  92                 }
  93
  94         /********************************************************************
  95          * Move the fdt
  96          ********************************************************************/
  97         } else if (strncmp(argv[1], "mo", 2) == 0) {
  98                 struct fdt_header *newaddr;
  99                 int  len;
 100                 int  err;
 101
 102                 if (argc < 4) {
 103                         printf ("Usage:\n%s\n", cmdtp->usage);
 104                         return 1;
 105                 }
 106
 107                 /*
 108                  * Set the address and length of the fdt.
 109                  */
 110                 fdt = (struct fdt_header *)simple_strtoul(argv[2], NULL, 16);
 111                 if (!fdt_valid()) {
 112                         return 1;
 113                 }
 114
 115                 newaddr = (struct fdt_header *)simple_strtoul(argv[3],NULL,16);
 116
 117                 /*
 118                  * If the user specifies a length, use that.  Otherwise use the
 119                  * current length.
 120                  */
 121                 if (argc <= 4) {
 122                         len = fdt_totalsize(fdt);
 123                 } else {
 124                         len = simple_strtoul(argv[4], NULL, 16);
 125                         if (len < fdt_totalsize(fdt)) {
 126                                 printf ("New length 0x%X < existing length "
 127                                         "0x%X, aborting.\n",
 128                                         len, fdt_totalsize(fdt));
 129                                 return 1;
 130                         }
 131                 }
 132
 133                 /*
 134                  * Copy to the new location.
 135                  */
 136                 err = fdt_open_into(fdt, newaddr, len);
 137                 if (err != 0) {
 138                         printf ("libfdt fdt_open_into(): %s\n",
 139                                 fdt_strerror(err));
 140                         return 1;
 141                 }
 142                 fdt = newaddr;
 143
 144         /********************************************************************
 145          * Make a new node
 146          ********************************************************************/
 147         } else if (strncmp(argv[1], "mk", 2) == 0) {
 148                 char *pathp;            /* path */
 149                 char *nodep;            /* new node to add */
 150                 int  nodeoffset;        /* node offset from libfdt */
 151                 int  err;
 152
 153                 /*
 154                  * Parameters: Node path, new node to be appended to the path.
 155                  */
 156                 if (argc < 4) {
 157                         printf ("Usage:\n%s\n", cmdtp->usage);
 158                         return 1;
 159                 }
 160
 161                 pathp = argv[2];
 162                 nodep = argv[3];
 163
 164                 nodeoffset = fdt_path_offset (fdt, pathp);
 165                 if (nodeoffset < 0) {
 166                         /*
 167                          * Not found or something else bad happened.
 168                          */
 169                         printf ("libfdt fdt_path_offset() returned %s\n",
 170                                 fdt_strerror(nodeoffset));
 171                         return 1;
 172                 }
 173                 err = fdt_add_subnode(fdt, nodeoffset, nodep);
 174                 if (err < 0) {
 175                         printf ("libfdt fdt_add_subnode(): %s\n",
 176                                 fdt_strerror(err));
 177                         return 1;
 178                 }
 179
 180         /********************************************************************
 181          * Set the value of a property in the fdt.
 182          ********************************************************************/
 183         } else if (argv[1][0] == 's') {
 184                 char *pathp;            /* path */
 185                 char *prop;             /* property */
 186                 int  nodeoffset;        /* node offset from libfdt */
 187                 static char data[SCRATCHPAD];   /* storage for the property */
 188                 int  len;               /* new length of the property */
 189                 int  ret;               /* return value */
 190
 191                 /*
 192                  * Parameters: Node path, property, optional value.
 193                  */
 194                 if (argc < 4) {
 195                         printf ("Usage:\n%s\n", cmdtp->usage);
 196                         return 1;
 197                 }
 198
 199                 pathp  = argv[2];
 200                 prop   = argv[3];
 201                 if (argc == 4) {
 202                         len = 0;
 203                 } else {
 204                         ret = fdt_parse_prop(&argv[4], argc - 4, data, &len);
 205                         if (ret != 0)
 206                                 return ret;
 207                 }
 208
 209                 nodeoffset = fdt_path_offset (fdt, pathp);
 210                 if (nodeoffset < 0) {
 211                         /*
 212                          * Not found or something else bad happened.
 213                          */
 214                         printf ("libfdt fdt_path_offset() returned %s\n",
 215                                 fdt_strerror(nodeoffset));
 216                         return 1;
 217                 }
 218
 219                 ret = fdt_setprop(fdt, nodeoffset, prop, data, len);
 220                 if (ret < 0) {
 221                         printf ("libfdt fdt_setprop(): %s\n", fdt_strerror(ret));
 222                         return 1;
 223                 }
 224
 225         /********************************************************************
 226          * Print (recursive) / List (single level)
 227          ********************************************************************/
 228         } else if ((argv[1][0] == 'p') || (argv[1][0] == 'l')) {
 229                 int depth = MAX_LEVEL;  /* how deep to print */
 230                 char *pathp;            /* path */
 231                 char *prop;             /* property */
 232                 int  ret;               /* return value */
 233                 static char root[2] = "/";
 234
 235                 /*
 236                  * list is an alias for print, but limited to 1 level
 237                  */
 238                 if (argv[1][0] == 'l') {
 239                         depth = 1;
 240                 }
 241
 242                 /*
 243                  * Get the starting path.  The root node is an oddball,
 244                  * the offset is zero and has no name.
 245                  */
 246                 if (argc == 2)
 247                         pathp = root;
 248                 else
 249                         pathp = argv[2];
 250                 if (argc > 3)
 251                         prop = argv[3];
 252                 else
 253                         prop = NULL;
 254
 255                 ret = fdt_print(pathp, prop, depth);
 256                 if (ret != 0)
 257                         return ret;
 258
 259         /********************************************************************
 260          * Remove a property/node
 261          ********************************************************************/
 262         } else if (strncmp(argv[1], "rm", 2) == 0) {
 263                 int  nodeoffset;        /* node offset from libfdt */
 264                 int  err;
 265
 266                 /*
 267                  * Get the path.  The root node is an oddball, the offset
 268                  * is zero and has no name.
 269                  */
 270                 nodeoffset = fdt_path_offset (fdt, argv[2]);
 271                 if (nodeoffset < 0) {
 272                         /*
 273                          * Not found or something else bad happened.
 274                          */
 275                         printf ("libfdt fdt_path_offset() returned %s\n",
 276                                 fdt_strerror(nodeoffset));
 277                         return 1;
 278                 }
 279                 /*
 280                  * Do the delete.  A fourth parameter means delete a property,
 281                  * otherwise delete the node.
 282                  */
 283                 if (argc > 3) {
 284                         err = fdt_delprop(fdt, nodeoffset, argv[3]);
 285                         if (err < 0) {
 286                                 printf("libfdt fdt_delprop():  %s\n",
 287                                         fdt_strerror(err));
 288                                 return err;
 289                         }
 290                 } else {
 291                         err = fdt_del_node(fdt, nodeoffset);
 292                         if (err < 0) {
 293                                 printf("libfdt fdt_del_node():  %s\n",
 294                                         fdt_strerror(err));
 295                                 return err;
 296                         }
 297                 }
 298
 299         /********************************************************************
 300          * Display header info
 301          ********************************************************************/
 302         } else if (argv[1][0] == 'h') {
 303                 u32 version = fdt_version(fdt);
 304                 printf("magic:\t\t\t0x%x\n", fdt_magic(fdt));
 305                 printf("totalsize:\t\t0x%x (%d)\n", fdt_totalsize(fdt), fdt_totalsize(fdt));
 306                 printf("off_dt_struct:\t\t0x%x\n", fdt_off_dt_struct(fdt));
 307                 printf("off_dt_strings:\t\t0x%x\n", fdt_off_dt_strings(fdt));
 308                 printf("off_mem_rsvmap:\t\t0x%x\n", fdt_off_mem_rsvmap(fdt));
 309                 printf("version:\t\t%d\n", version);
 310                 printf("last_comp_version:\t%d\n", fdt_last_comp_version(fdt));
 311                 if (version >= 2)
 312                         printf("boot_cpuid_phys:\t0x%x\n",
 313                                 fdt_boot_cpuid_phys(fdt));
 314                 if (version >= 3)
 315                         printf("size_dt_strings:\t0x%x\n",
 316                                 fdt_size_dt_strings(fdt));
 317                 if (version >= 17)
 318                         printf("size_dt_struct:\t\t0x%x\n",
 319                                 fdt_size_dt_struct(fdt));
 320                 printf("number mem_rsv:\t\t0x%x\n", fdt_num_mem_rsv(fdt));
 321                 printf("\n");
 322
 323         /********************************************************************
 324          * Set boot cpu id
 325          ********************************************************************/
 326         } else if (strncmp(argv[1], "boo", 3) == 0) {
 327                 unsigned long tmp = simple_strtoul(argv[2], NULL, 16);
 328                 fdt_set_boot_cpuid_phys(fdt, tmp);
 329
 330         /********************************************************************
 331          * memory command
 332          ********************************************************************/
 333         } else if (strncmp(argv[1], "me", 2) == 0) {
 334                 uint64_t addr, size;
 335                 int err;
 336 #ifdef CFG_64BIT_STRTOUL
 337                         addr = simple_strtoull(argv[2], NULL, 16);
 338                         size = simple_strtoull(argv[3], NULL, 16);
 339 #else
 340                         addr = simple_strtoul(argv[2], NULL, 16);
 341                         size = simple_strtoul(argv[3], NULL, 16);
 342 #endif
 343                 err = fdt_fixup_memory(fdt, addr, size);
 344                 if (err < 0)
 345                         return err;
 346
 347         /********************************************************************
 348          * mem reserve commands
 349          ********************************************************************/
 350         } else if (strncmp(argv[1], "rs", 2) == 0) {
 351                 if (argv[2][0] == 'p') {
 352                         uint64_t addr, size;
 353                         int total = fdt_num_mem_rsv(fdt);
 354                         int j, err;
 355                         printf("index\t\t   start\t\t    size\n");
 356                         printf("-------------------------------"
 357                                 "-----------------\n");
 358                         for (j = 0; j < total; j++) {
 359                                 err = fdt_get_mem_rsv(fdt, j, &addr, &size);
 360                                 if (err < 0) {
 361                                         printf("libfdt fdt_get_mem_rsv():  %s\n",
 362                                                         fdt_strerror(err));
 363                                         return err;
 364                                 }
 365                                 printf("    %x\t%08x%08x\t%08x%08x\n", j,
 366                                         (u32)(addr >> 32),
 367                                         (u32)(addr & 0xffffffff),
 368                                         (u32)(size >> 32),
 369                                         (u32)(size & 0xffffffff));
 370                         }
 371                 } else if (argv[2][0] == 'a') {
 372                         uint64_t addr, size;
 373                         int err;
 374 #ifdef CFG_64BIT_STRTOUL
 375                         addr = simple_strtoull(argv[3], NULL, 16);
 376                         size = simple_strtoull(argv[4], NULL, 16);
 377 #else
 378                         addr = simple_strtoul(argv[3], NULL, 16);
 379                         size = simple_strtoul(argv[4], NULL, 16);
 380 #endif
 381                         err = fdt_add_mem_rsv(fdt, addr, size);
 382
 383                         if (err < 0) {
 384                                 printf("libfdt fdt_add_mem_rsv():  %s\n",
 385                                         fdt_strerror(err));
 386                                 return err;
 387                         }
 388                 } else if (argv[2][0] == 'd') {
 389                         unsigned long idx = simple_strtoul(argv[3], NULL, 16);
 390                         int err = fdt_del_mem_rsv(fdt, idx);
 391
 392                         if (err < 0) {
 393                                 printf("libfdt fdt_del_mem_rsv():  %s\n",
 394                                         fdt_strerror(err));
 395                                 return err;
 396                         }
 397                 } else {
 398                         /* Unrecognized command */
 399                         printf ("Usage:\n%s\n", cmdtp->usage);
 400                         return 1;
 401                 }
 402         }
 403 #ifdef CONFIG_OF_BOARD_SETUP
 404         /* Call the board-specific fixup routine */
 405         else if (strncmp(argv[1], "boa", 3) == 0)
 406                 ft_board_setup(fdt, gd->bd);
 407 #endif
 408         /* Create a chosen node */
 409         else if (argv[1][0] == 'c')
 410                 fdt_chosen(fdt, 0, 0, 1);
 411         else {
 412                 /* Unrecognized command */
 413                 printf ("Usage:\n%s\n", cmdtp->usage);
 414                 return 1;
 415         }
 416
 417         return 0;
 418 }
 419
 420 /****************************************************************************/
 421
 422 static int fdt_valid(void)
 423 {
 424         int  err;
 425
 426         if (fdt == NULL) {
 427                 printf ("The address of the fdt is invalid (NULL).\n");
 428                 return 0;
 429         }
 430
 431         err = fdt_check_header(fdt);
 432         if (err == 0)
 433                 return 1;       /* valid */
 434
 435         if (err < 0) {
 436                 printf("libfdt fdt_check_header(): %s", fdt_strerror(err));
 437                 /*
 438                  * Be more informative on bad version.
 439                  */
 440                 if (err == -FDT_ERR_BADVERSION) {
 441                         if (fdt_version(fdt) < FDT_FIRST_SUPPORTED_VERSION) {
 442                                 printf (" - too old, fdt $d < %d",
 443                                         fdt_version(fdt),
 444                                         FDT_FIRST_SUPPORTED_VERSION);
 445                                 fdt = NULL;
 446                         }
 447                         if (fdt_last_comp_version(fdt) > FDT_LAST_SUPPORTED_VERSION) {
 448                                 printf (" - too new, fdt $d > %d",
 449                                         fdt_version(fdt),
 450                                         FDT_LAST_SUPPORTED_VERSION);
 451                                 fdt = NULL;
 452                         }
 453                         return 0;
 454                 }
 455                 printf("\n");
 456                 return 0;
 457         }
 458         return 1;
 459 }
 460
 461 /****************************************************************************/
 462
 463 /*
 464  * Parse the user's input, partially heuristic.  Valid formats:
 465  * <0x00112233 4 05>    - an array of cells.  Numbers follow standard
 466  *                      C conventions.
 467  * [00 11 22 .. nn] - byte stream
 468  * "string"     - If the the value doesn't start with "<" or "[", it is
 469  *                      treated as a string.  Note that the quotes are
 470  *                      stripped by the parser before we get the string.
 471  * newval: An array of strings containing the new property as specified
 472  *      on the command line
 473  * count: The number of strings in the array
 474  * data: A bytestream to be placed in the property
 475  * len: The length of the resulting bytestream
 476  */
 477 static int fdt_parse_prop(char **newval, int count, char *data, int *len)
 478 {
 479         char *cp;               /* temporary char pointer */
 480         char *newp;             /* temporary newval char pointer */
 481         unsigned long tmp;      /* holds converted values */
 482         int stridx = 0;
 483
 484         *len = 0;
 485         newp = newval[0];
 486
 487         /* An array of cells */
 488         if (*newp == '<') {
 489                 newp++;
 490                 while ((*newp != '>') && (stridx < count)) {
 491                         /*
 492                          * Keep searching until we find that last ">"
 493                          * That way users don't have to escape the spaces
 494                          */
 495                         if (*newp == '\0') {
 496                                 newp = newval[++stridx];
 497                                 continue;
 498                         }
 499
 500                         cp = newp;
 501                         tmp = simple_strtoul(cp, &newp, 0);
 502                         *(uint32_t *)data = __cpu_to_be32(tmp);
 503                         data  += 4;
 504                         *len += 4;
 505
 506                         /* If the ptr didn't advance, something went wrong */
 507                         if ((newp - cp) <= 0) {
 508                                 printf("Sorry, I could not convert \"%s\"\n",
 509                                         cp);
 510                                 return 1;
 511                         }
 512
 513                         while (*newp == ' ')
 514                                 newp++;
 515                 }
 516
 517                 if (*newp != '>') {
 518                         printf("Unexpected character '%c'\n", *newp);
 519                         return 1;
 520                 }
 521         } else if (*newp == '[') {
 522                 /*
 523                  * Byte stream.  Convert the values.
 524                  */
 525                 newp++;
 526                 while ((*newp != ']') && (stridx < count)) {
 527                         tmp = simple_strtoul(newp, &newp, 16);
 528                         *data++ = tmp & 0xFF;
 529                         *len    = *len + 1;
 530                         while (*newp == ' ')
 531                                 newp++;
 532                         if (*newp != '\0')
 533                                 newp = newval[++stridx];
 534                 }
 535                 if (*newp != ']') {
 536                         printf("Unexpected character '%c'\n", *newval);
 537                         return 1;
 538                 }
 539         } else {
 540                 /*
 541                  * Assume it is a string.  Copy it into our data area for
 542                  * convenience (including the terminating '\0').
 543                  */
 544                 while (stridx < count) {
 545                         *len = strlen(newp) + 1;
 546                         strcpy(data, newp);
 547                         newp = newval[++stridx];
 548                 }
 549         }
 550         return 0;
 551 }
 552
 553 /****************************************************************************/
 554
 555 /*
 556  * Heuristic to guess if this is a string or concatenated strings.
 557  */
 558
 559 static int is_printable_string(const void *data, int len)
 560 {
 561         const char *s = data;
 562
 563         /* zero length is not */
 564         if (len == 0)
 565                 return 0;
 566
 567         /* must terminate with zero */
 568         if (s[len - 1] != '\0')
 569                 return 0;
 570
 571         /* printable or a null byte (concatenated strings) */
 572         while (((*s == '\0') || isprint(*s)) && (len > 0)) {
 573                 /*
 574                  * If we see a null, there are three possibilities:
 575                  * 1) If len == 1, it is the end of the string, printable
 576                  * 2) Next character also a null, not printable.
 577                  * 3) Next character not a null, continue to check.
 578                  */
 579                 if (s[0] == '\0') {
 580                         if (len == 1)
 581                                 return 1;
 582                         if (s[1] == '\0')
 583                                 return 0;
 584                 }
 585                 s++;
 586                 len--;
 587         }
 588
 589         /* Not the null termination, or not done yet: not printable */
 590         if (*s != '\0' || (len != 0))
 591                 return 0;
 592
 593         return 1;
 594 }
 595
 596
 597 /*
 598  * Print the property in the best format, a heuristic guess.  Print as
 599  * a string, concatenated strings, a byte, word, double word, or (if all
 600  * else fails) it is printed as a stream of bytes.
 601  */
 602 static void print_data(const void *data, int len)
 603 {
 604         int j;
 605
 606         /* no data, don't print */
 607         if (len == 0)
 608                 return;
 609
 610         /*
 611          * It is a string, but it may have multiple strings (embedded '\0's).
 612          */
 613         if (is_printable_string(data, len)) {
 614                 puts("\"");
 615                 j = 0;
 616                 while (j < len) {
 617                         if (j > 0)
 618                                 puts("\", \"");
 619                         puts(data);
 620                         j    += strlen(data) + 1;
 621                         data += strlen(data) + 1;
 622                 }
 623                 puts("\"");
 624                 return;
 625         }
 626
 627         if ((len %4) == 0) {
 628                 const u32 *p;
 629
 630                 printf("<");
 631                 for (j = 0, p = data; j < len/4; j ++)
 632                         printf("0x%x%s", p[j], j < (len/4 - 1) ? " " : "");
 633                 printf(">");
 634         } else { /* anything else... hexdump */
 635                 const u8 *s;
 636
 637                 printf("[");
 638                 for (j = 0, s = data; j < len; j++)
 639                         printf("%02x%s", s[j], j < len - 1 ? " " : "");
 640                 printf("]");
 641         }
 642 }
 643
 644 /****************************************************************************/
 645
 646 /*
 647  * Recursively print (a portion of) the fdt.  The depth parameter
 648  * determines how deeply nested the fdt is printed.
 649  */
 650 static int fdt_print(const char *pathp, char *prop, int depth)
 651 {
 652         static char tabs[MAX_LEVEL+1] =
 653                 "\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t"
 654                 "\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t";
 655         const void *nodep;      /* property node pointer */
 656         int  nodeoffset;        /* node offset from libfdt */
 657         int  nextoffset;        /* next node offset from libfdt */
 658         uint32_t tag;           /* tag */
 659         int  len;               /* length of the property */
 660         int  level = 0;         /* keep track of nesting level */
 661         const struct fdt_property *fdt_prop;
 662
 663         nodeoffset = fdt_path_offset (fdt, pathp);
 664         if (nodeoffset < 0) {
 665                 /*
 666                  * Not found or something else bad happened.
 667                  */
 668                 printf ("libfdt fdt_path_offset() returned %s\n",
 669                         fdt_strerror(nodeoffset));
 670                 return 1;
 671         }
 672         /*
 673          * The user passed in a property as well as node path.
 674          * Print only the given property and then return.
 675          */
 676         if (prop) {
 677                 nodep = fdt_getprop (fdt, nodeoffset, prop, &len);
 678                 if (len == 0) {
 679                         /* no property value */
 680                         printf("%s %s\n", pathp, prop);
 681                         return 0;
 682                 } else if (len > 0) {
 683                         printf("%s = ", prop);
 684                         print_data (nodep, len);
 685                         printf("\n");
 686                         return 0;
 687                 } else {
 688                         printf ("libfdt fdt_getprop(): %s\n",
 689                                 fdt_strerror(len));
 690                         return 1;
 691                 }
 692         }
 693
 694         /*
 695          * The user passed in a node path and no property,
 696          * print the node and all subnodes.
 697          */
 698         while(level >= 0) {
 699                 tag = fdt_next_tag(fdt, nodeoffset, &nextoffset);
 700                 switch(tag) {
 701                 case FDT_BEGIN_NODE:
 702                         pathp = fdt_get_name(fdt, nodeoffset, NULL);
 703                         if (level <= depth) {
 704                                 if (pathp == NULL)
 705                                         pathp = "/* NULL pointer error */";
 706                                 if (*pathp == '\0')
 707                                         pathp = "/";    /* root is nameless */
 708                                 printf("%s%s {\n",
 709                                         &tabs[MAX_LEVEL - level], pathp);
 710                         }
 711                         level++;
 712                         if (level >= MAX_LEVEL) {
 713                                 printf("Nested too deep, aborting.\n");
 714                                 return 1;
 715                         }
 716                         break;
 717                 case FDT_END_NODE:
 718                         level--;
 719                         if (level <= depth)
 720                                 printf("%s};\n", &tabs[MAX_LEVEL - level]);
 721                         if (level == 0) {
 722                                 level = -1;             /* exit the loop */
 723                         }
 724                         break;
 725                 case FDT_PROP:
 726                         fdt_prop = fdt_offset_ptr(fdt, nodeoffset,
 727                                         sizeof(*fdt_prop));
 728                         pathp    = fdt_string(fdt,
 729                                         fdt32_to_cpu(fdt_prop->nameoff));
 730                         len      = fdt32_to_cpu(fdt_prop->len);
 731                         nodep    = fdt_prop->data;
 732                         if (len < 0) {
 733                                 printf ("libfdt fdt_getprop(): %s\n",
 734                                         fdt_strerror(len));
 735                                 return 1;
 736                         } else if (len == 0) {
 737                                 /* the property has no value */
 738                                 if (level <= depth)
 739                                         printf("%s%s;\n",
 740                                                 &tabs[MAX_LEVEL - level],
 741                                                 pathp);
 742                         } else {
 743                                 if (level <= depth) {
 744                                         printf("%s%s = ",
 745                                                 &tabs[MAX_LEVEL - level],
 746                                                 pathp);
 747                                         print_data (nodep, len);
 748                                         printf(";\n");
 749                                 }
 750                         }
 751                         break;
 752                 case FDT_NOP:
 753                         printf("/* NOP */\n", &tabs[MAX_LEVEL - level]);
 754                         break;
 755                 case FDT_END:
 756                         return 1;
 757                 default:
 758                         if (level <= depth)
 759                                 printf("Unknown tag 0x%08X\n", tag);
 760                         return 1;
 761                 }
 762                 nodeoffset = nextoffset;
 763         }
 764         return 0;
 765 }
 766
 767 /********************************************************************/
 768
 769 U_BOOT_CMD(
 770         fdt,    255,    0,      do_fdt,
 771         "fdt     - flattened device tree utility commands\n",
 772             "addr   <addr> [<length>]        - Set the fdt location to <addr>\n"
 773 #ifdef CONFIG_OF_BOARD_SETUP
 774         "fdt boardsetup                      - Do board-specific set up\n"
 775 #endif
 776         "fdt move   <fdt> <newaddr> <length> - Copy the fdt to <addr> and make it active\n"
 777         "fdt print  <path> [<prop>]          - Recursive print starting at <path>\n"
 778         "fdt list   <path> [<prop>]          - Print one level starting at <path>\n"
 779         "fdt set    <path> <prop> [<val>]    - Set <property> [to <val>]\n"
 780         "fdt mknode <path> <node>            - Create a new node after <path>\n"
 781         "fdt rm     <path> [<prop>]          - Delete the node or <property>\n"
 782         "fdt header                          - Display header info\n"
 783         "fdt bootcpu <id>                    - Set boot cpuid\n"
 784         "fdt memory <addr> <size>            - Add/Update memory node\n"
 785         "fdt rsvmem print                    - Show current mem reserves\n"
 786         "fdt rsvmem add <addr> <size>        - Add a mem reserve\n"
 787         "fdt rsvmem delete <index>           - Delete a mem reserves\n"
 788         "fdt chosen - Add/update the /chosen branch in the tree\n"
 789         "NOTE: If the path or property you are setting/printing has a '#' character\n"
 790         "     or spaces, you MUST escape it with a \\ character or quote it with \".\n"
 791 );