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                 working_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(working_fdt)) {
  79                                 printf ("New length %d < existing length %d, "
  80                                         "ignoring.\n",
  81                                         len, fdt_totalsize(working_fdt));
  82                         } else {
  83                                 /*
  84                                  * Open in place with a new length.
  85                                  */
  86                                 err = fdt_open_into(working_fdt, working_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 working_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                 working_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(working_fdt);
 123                 } else {
 124                         len = simple_strtoul(argv[4], NULL, 16);
 125                         if (len < fdt_totalsize(working_fdt)) {
 126                                 printf ("New length 0x%X < existing length "
 127                                         "0x%X, aborting.\n",
 128                                         len, fdt_totalsize(working_fdt));
 129                                 return 1;
 130                         }
 131                 }
 132
 133                 /*
 134                  * Copy to the new location.
 135                  */
 136                 err = fdt_open_into(working_fdt, newaddr, len);
 137                 if (err != 0) {
 138                         printf ("libfdt fdt_open_into(): %s\n",
 139                                 fdt_strerror(err));
 140                         return 1;
 141                 }
 142                 working_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 (working_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(working_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 working_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 (working_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(working_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 (working_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(working_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(working_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(working_fdt);
 304                 printf("magic:\t\t\t0x%x\n", fdt_magic(working_fdt));
 305                 printf("totalsize:\t\t0x%x (%d)\n", fdt_totalsize(working_fdt),
 306                        fdt_totalsize(working_fdt));
 307                 printf("off_dt_struct:\t\t0x%x\n",
 308                        fdt_off_dt_struct(working_fdt));
 309                 printf("off_dt_strings:\t\t0x%x\n",
 310                        fdt_off_dt_strings(working_fdt));
 311                 printf("off_mem_rsvmap:\t\t0x%x\n",
 312                        fdt_off_mem_rsvmap(working_fdt));
 313                 printf("version:\t\t%d\n", version);
 314                 printf("last_comp_version:\t%d\n",
 315                        fdt_last_comp_version(working_fdt));
 316                 if (version >= 2)
 317                         printf("boot_cpuid_phys:\t0x%x\n",
 318                                 fdt_boot_cpuid_phys(working_fdt));
 319                 if (version >= 3)
 320                         printf("size_dt_strings:\t0x%x\n",
 321                                 fdt_size_dt_strings(working_fdt));
 322                 if (version >= 17)
 323                         printf("size_dt_struct:\t\t0x%x\n",
 324                                 fdt_size_dt_struct(working_fdt));
 325                 printf("number mem_rsv:\t\t0x%x\n",
 326                        fdt_num_mem_rsv(working_fdt));
 327                 printf("\n");
 328
 329         /********************************************************************
 330          * Set boot cpu id
 331          ********************************************************************/
 332         } else if (strncmp(argv[1], "boo", 3) == 0) {
 333                 unsigned long tmp = simple_strtoul(argv[2], NULL, 16);
 334                 fdt_set_boot_cpuid_phys(working_fdt, tmp);
 335
 336         /********************************************************************
 337          * memory command
 338          ********************************************************************/
 339         } else if (strncmp(argv[1], "me", 2) == 0) {
 340                 uint64_t addr, size;
 341                 int err;
 342 #ifdef CFG_64BIT_STRTOUL
 343                         addr = simple_strtoull(argv[2], NULL, 16);
 344                         size = simple_strtoull(argv[3], NULL, 16);
 345 #else
 346                         addr = simple_strtoul(argv[2], NULL, 16);
 347                         size = simple_strtoul(argv[3], NULL, 16);
 348 #endif
 349                 err = fdt_fixup_memory(working_fdt, addr, size);
 350                 if (err < 0)
 351                         return err;
 352
 353         /********************************************************************
 354          * mem reserve commands
 355          ********************************************************************/
 356         } else if (strncmp(argv[1], "rs", 2) == 0) {
 357                 if (argv[2][0] == 'p') {
 358                         uint64_t addr, size;
 359                         int total = fdt_num_mem_rsv(working_fdt);
 360                         int j, err;
 361                         printf("index\t\t   start\t\t    size\n");
 362                         printf("-------------------------------"
 363                                 "-----------------\n");
 364                         for (j = 0; j < total; j++) {
 365                                 err = fdt_get_mem_rsv(working_fdt, j, &addr, &size);
 366                                 if (err < 0) {
 367                                         printf("libfdt fdt_get_mem_rsv():  %s\n",
 368                                                         fdt_strerror(err));
 369                                         return err;
 370                                 }
 371                                 printf("    %x\t%08x%08x\t%08x%08x\n", j,
 372                                         (u32)(addr >> 32),
 373                                         (u32)(addr & 0xffffffff),
 374                                         (u32)(size >> 32),
 375                                         (u32)(size & 0xffffffff));
 376                         }
 377                 } else if (argv[2][0] == 'a') {
 378                         uint64_t addr, size;
 379                         int err;
 380 #ifdef CFG_64BIT_STRTOUL
 381                         addr = simple_strtoull(argv[3], NULL, 16);
 382                         size = simple_strtoull(argv[4], NULL, 16);
 383 #else
 384                         addr = simple_strtoul(argv[3], NULL, 16);
 385                         size = simple_strtoul(argv[4], NULL, 16);
 386 #endif
 387                         err = fdt_add_mem_rsv(working_fdt, addr, size);
 388
 389                         if (err < 0) {
 390                                 printf("libfdt fdt_add_mem_rsv():  %s\n",
 391                                         fdt_strerror(err));
 392                                 return err;
 393                         }
 394                 } else if (argv[2][0] == 'd') {
 395                         unsigned long idx = simple_strtoul(argv[3], NULL, 16);
 396                         int err = fdt_del_mem_rsv(working_fdt, idx);
 397
 398                         if (err < 0) {
 399                                 printf("libfdt fdt_del_mem_rsv():  %s\n",
 400                                         fdt_strerror(err));
 401                                 return err;
 402                         }
 403                 } else {
 404                         /* Unrecognized command */
 405                         printf ("Usage:\n%s\n", cmdtp->usage);
 406                         return 1;
 407                 }
 408         }
 409 #ifdef CONFIG_OF_BOARD_SETUP
 410         /* Call the board-specific fixup routine */
 411         else if (strncmp(argv[1], "boa", 3) == 0)
 412                 ft_board_setup(working_fdt, gd->bd);
 413 #endif
 414         /* Create a chosen node */
 415         else if (argv[1][0] == 'c')
 416                 fdt_chosen(working_fdt, 0, 0, 1);
 417         else {
 418                 /* Unrecognized command */
 419                 printf ("Usage:\n%s\n", cmdtp->usage);
 420                 return 1;
 421         }
 422
 423         return 0;
 424 }
 425
 426 /****************************************************************************/
 427
 428 static int fdt_valid(void)
 429 {
 430         int  err;
 431
 432         if (working_fdt == NULL) {
 433                 printf ("The address of the fdt is invalid (NULL).\n");
 434                 return 0;
 435         }
 436
 437         err = fdt_check_header(working_fdt);
 438         if (err == 0)
 439                 return 1;       /* valid */
 440
 441         if (err < 0) {
 442                 printf("libfdt fdt_check_header(): %s", fdt_strerror(err));
 443                 /*
 444                  * Be more informative on bad version.
 445                  */
 446                 if (err == -FDT_ERR_BADVERSION) {
 447                         if (fdt_version(working_fdt) <
 448                             FDT_FIRST_SUPPORTED_VERSION) {
 449                                 printf (" - too old, fdt $d < %d",
 450                                         fdt_version(working_fdt),
 451                                         FDT_FIRST_SUPPORTED_VERSION);
 452                                 working_fdt = NULL;
 453                         }
 454                         if (fdt_last_comp_version(working_fdt) >
 455                             FDT_LAST_SUPPORTED_VERSION) {
 456                                 printf (" - too new, fdt $d > %d",
 457                                         fdt_version(working_fdt),
 458                                         FDT_LAST_SUPPORTED_VERSION);
 459                                 working_fdt = NULL;
 460                         }
 461                         return 0;
 462                 }
 463                 printf("\n");
 464                 return 0;
 465         }
 466         return 1;
 467 }
 468
 469 /****************************************************************************/
 470
 471 /*
 472  * Parse the user's input, partially heuristic.  Valid formats:
 473  * <0x00112233 4 05>    - an array of cells.  Numbers follow standard
 474  *                      C conventions.
 475  * [00 11 22 .. nn] - byte stream
 476  * "string"     - If the the value doesn't start with "<" or "[", it is
 477  *                      treated as a string.  Note that the quotes are
 478  *                      stripped by the parser before we get the string.
 479  * newval: An array of strings containing the new property as specified
 480  *      on the command line
 481  * count: The number of strings in the array
 482  * data: A bytestream to be placed in the property
 483  * len: The length of the resulting bytestream
 484  */
 485 static int fdt_parse_prop(char **newval, int count, char *data, int *len)
 486 {
 487         char *cp;               /* temporary char pointer */
 488         char *newp;             /* temporary newval char pointer */
 489         unsigned long tmp;      /* holds converted values */
 490         int stridx = 0;
 491
 492         *len = 0;
 493         newp = newval[0];
 494
 495         /* An array of cells */
 496         if (*newp == '<') {
 497                 newp++;
 498                 while ((*newp != '>') && (stridx < count)) {
 499                         /*
 500                          * Keep searching until we find that last ">"
 501                          * That way users don't have to escape the spaces
 502                          */
 503                         if (*newp == '\0') {
 504                                 newp = newval[++stridx];
 505                                 continue;
 506                         }
 507
 508                         cp = newp;
 509                         tmp = simple_strtoul(cp, &newp, 0);
 510                         *(uint32_t *)data = __cpu_to_be32(tmp);
 511                         data  += 4;
 512                         *len += 4;
 513
 514                         /* If the ptr didn't advance, something went wrong */
 515                         if ((newp - cp) <= 0) {
 516                                 printf("Sorry, I could not convert \"%s\"\n",
 517                                         cp);
 518                                 return 1;
 519                         }
 520
 521                         while (*newp == ' ')
 522                                 newp++;
 523                 }
 524
 525                 if (*newp != '>') {
 526                         printf("Unexpected character '%c'\n", *newp);
 527                         return 1;
 528                 }
 529         } else if (*newp == '[') {
 530                 /*
 531                  * Byte stream.  Convert the values.
 532                  */
 533                 newp++;
 534                 while ((*newp != ']') && (stridx < count)) {
 535                         tmp = simple_strtoul(newp, &newp, 16);
 536                         *data++ = tmp & 0xFF;
 537                         *len    = *len + 1;
 538                         while (*newp == ' ')
 539                                 newp++;
 540                         if (*newp != '\0')
 541                                 newp = newval[++stridx];
 542                 }
 543                 if (*newp != ']') {
 544                         printf("Unexpected character '%c'\n", *newval);
 545                         return 1;
 546                 }
 547         } else {
 548                 /*
 549                  * Assume it is a string.  Copy it into our data area for
 550                  * convenience (including the terminating '\0').
 551                  */
 552                 while (stridx < count) {
 553                         *len = strlen(newp) + 1;
 554                         strcpy(data, newp);
 555                         newp = newval[++stridx];
 556                 }
 557         }
 558         return 0;
 559 }
 560
 561 /****************************************************************************/
 562
 563 /*
 564  * Heuristic to guess if this is a string or concatenated strings.
 565  */
 566
 567 static int is_printable_string(const void *data, int len)
 568 {
 569         const char *s = data;
 570
 571         /* zero length is not */
 572         if (len == 0)
 573                 return 0;
 574
 575         /* must terminate with zero */
 576         if (s[len - 1] != '\0')
 577                 return 0;
 578
 579         /* printable or a null byte (concatenated strings) */
 580         while (((*s == '\0') || isprint(*s)) && (len > 0)) {
 581                 /*
 582                  * If we see a null, there are three possibilities:
 583                  * 1) If len == 1, it is the end of the string, printable
 584                  * 2) Next character also a null, not printable.
 585                  * 3) Next character not a null, continue to check.
 586                  */
 587                 if (s[0] == '\0') {
 588                         if (len == 1)
 589                                 return 1;
 590                         if (s[1] == '\0')
 591                                 return 0;
 592                 }
 593                 s++;
 594                 len--;
 595         }
 596
 597         /* Not the null termination, or not done yet: not printable */
 598         if (*s != '\0' || (len != 0))
 599                 return 0;
 600
 601         return 1;
 602 }
 603
 604
 605 /*
 606  * Print the property in the best format, a heuristic guess.  Print as
 607  * a string, concatenated strings, a byte, word, double word, or (if all
 608  * else fails) it is printed as a stream of bytes.
 609  */
 610 static void print_data(const void *data, int len)
 611 {
 612         int j;
 613
 614         /* no data, don't print */
 615         if (len == 0)
 616                 return;
 617
 618         /*
 619          * It is a string, but it may have multiple strings (embedded '\0's).
 620          */
 621         if (is_printable_string(data, len)) {
 622                 puts("\"");
 623                 j = 0;
 624                 while (j < len) {
 625                         if (j > 0)
 626                                 puts("\", \"");
 627                         puts(data);
 628                         j    += strlen(data) + 1;
 629                         data += strlen(data) + 1;
 630                 }
 631                 puts("\"");
 632                 return;
 633         }
 634
 635         if ((len %4) == 0) {
 636                 const u32 *p;
 637
 638                 printf("<");
 639                 for (j = 0, p = data; j < len/4; j ++)
 640                         printf("0x%x%s", p[j], j < (len/4 - 1) ? " " : "");
 641                 printf(">");
 642         } else { /* anything else... hexdump */
 643                 const u8 *s;
 644
 645                 printf("[");
 646                 for (j = 0, s = data; j < len; j++)
 647                         printf("%02x%s", s[j], j < len - 1 ? " " : "");
 648                 printf("]");
 649         }
 650 }
 651
 652 /****************************************************************************/
 653
 654 /*
 655  * Recursively print (a portion of) the working_fdt.  The depth parameter
 656  * determines how deeply nested the fdt is printed.
 657  */
 658 static int fdt_print(const char *pathp, char *prop, int depth)
 659 {
 660         static char tabs[MAX_LEVEL+1] =
 661                 "\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t"
 662                 "\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t";
 663         const void *nodep;      /* property node pointer */
 664         int  nodeoffset;        /* node offset from libfdt */
 665         int  nextoffset;        /* next node offset from libfdt */
 666         uint32_t tag;           /* tag */
 667         int  len;               /* length of the property */
 668         int  level = 0;         /* keep track of nesting level */
 669         const struct fdt_property *fdt_prop;
 670
 671         nodeoffset = fdt_path_offset (working_fdt, pathp);
 672         if (nodeoffset < 0) {
 673                 /*
 674                  * Not found or something else bad happened.
 675                  */
 676                 printf ("libfdt fdt_path_offset() returned %s\n",
 677                         fdt_strerror(nodeoffset));
 678                 return 1;
 679         }
 680         /*
 681          * The user passed in a property as well as node path.
 682          * Print only the given property and then return.
 683          */
 684         if (prop) {
 685                 nodep = fdt_getprop (working_fdt, nodeoffset, prop, &len);
 686                 if (len == 0) {
 687                         /* no property value */
 688                         printf("%s %s\n", pathp, prop);
 689                         return 0;
 690                 } else if (len > 0) {
 691                         printf("%s = ", prop);
 692                         print_data (nodep, len);
 693                         printf("\n");
 694                         return 0;
 695                 } else {
 696                         printf ("libfdt fdt_getprop(): %s\n",
 697                                 fdt_strerror(len));
 698                         return 1;
 699                 }
 700         }
 701
 702         /*
 703          * The user passed in a node path and no property,
 704          * print the node and all subnodes.
 705          */
 706         while(level >= 0) {
 707                 tag = fdt_next_tag(working_fdt, nodeoffset, &nextoffset);
 708                 switch(tag) {
 709                 case FDT_BEGIN_NODE:
 710                         pathp = fdt_get_name(working_fdt, nodeoffset, NULL);
 711                         if (level <= depth) {
 712                                 if (pathp == NULL)
 713                                         pathp = "/* NULL pointer error */";
 714                                 if (*pathp == '\0')
 715                                         pathp = "/";    /* root is nameless */
 716                                 printf("%s%s {\n",
 717                                         &tabs[MAX_LEVEL - level], pathp);
 718                         }
 719                         level++;
 720                         if (level >= MAX_LEVEL) {
 721                                 printf("Nested too deep, aborting.\n");
 722                                 return 1;
 723                         }
 724                         break;
 725                 case FDT_END_NODE:
 726                         level--;
 727                         if (level <= depth)
 728                                 printf("%s};\n", &tabs[MAX_LEVEL - level]);
 729                         if (level == 0) {
 730                                 level = -1;             /* exit the loop */
 731                         }
 732                         break;
 733                 case FDT_PROP:
 734                         fdt_prop = fdt_offset_ptr(working_fdt, nodeoffset,
 735                                         sizeof(*fdt_prop));
 736                         pathp    = fdt_string(working_fdt,
 737                                         fdt32_to_cpu(fdt_prop->nameoff));
 738                         len      = fdt32_to_cpu(fdt_prop->len);
 739                         nodep    = fdt_prop->data;
 740                         if (len < 0) {
 741                                 printf ("libfdt fdt_getprop(): %s\n",
 742                                         fdt_strerror(len));
 743                                 return 1;
 744                         } else if (len == 0) {
 745                                 /* the property has no value */
 746                                 if (level <= depth)
 747                                         printf("%s%s;\n",
 748                                                 &tabs[MAX_LEVEL - level],
 749                                                 pathp);
 750                         } else {
 751                                 if (level <= depth) {
 752                                         printf("%s%s = ",
 753                                                 &tabs[MAX_LEVEL - level],
 754                                                 pathp);
 755                                         print_data (nodep, len);
 756                                         printf(";\n");
 757                                 }
 758                         }
 759                         break;
 760                 case FDT_NOP:
 761                         printf("/* NOP */\n", &tabs[MAX_LEVEL - level]);
 762                         break;
 763                 case FDT_END:
 764                         return 1;
 765                 default:
 766                         if (level <= depth)
 767                                 printf("Unknown tag 0x%08X\n", tag);
 768                         return 1;
 769                 }
 770                 nodeoffset = nextoffset;
 771         }
 772         return 0;
 773 }
 774
 775 /********************************************************************/
 776
 777 U_BOOT_CMD(
 778         fdt,    255,    0,      do_fdt,
 779         "fdt     - flattened device tree utility commands\n",
 780             "addr   <addr> [<length>]        - Set the fdt location to <addr>\n"
 781 #ifdef CONFIG_OF_BOARD_SETUP
 782         "fdt boardsetup                      - Do board-specific set up\n"
 783 #endif
 784         "fdt move   <fdt> <newaddr> <length> - Copy the fdt to <addr> and make it active\n"
 785         "fdt print  <path> [<prop>]          - Recursive print starting at <path>\n"
 786         "fdt list   <path> [<prop>]          - Print one level starting at <path>\n"
 787         "fdt set    <path> <prop> [<val>]    - Set <property> [to <val>]\n"
 788         "fdt mknode <path> <node>            - Create a new node after <path>\n"
 789         "fdt rm     <path> [<prop>]          - Delete the node or <property>\n"
 790         "fdt header                          - Display header info\n"
 791         "fdt bootcpu <id>                    - Set boot cpuid\n"
 792         "fdt memory <addr> <size>            - Add/Update memory node\n"
 793         "fdt rsvmem print                    - Show current mem reserves\n"
 794         "fdt rsvmem add <addr> <size>        - Add a mem reserve\n"
 795         "fdt rsvmem delete <index>           - Delete a mem reserves\n"
 796         "fdt chosen - Add/update the /chosen branch in the tree\n"
 797         "NOTE: If the path or property you are setting/printing has a '#' character\n"
 798         "     or spaces, you MUST escape it with a \\ character or quote it with \".\n"
 799 );