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 *const*newval, int count, char *data, int *len);
  46 static int fdt_print(const char *pathp, char *prop, int depth);
  47
  48 /*
  49  * The working_fdt points to our working flattened device tree.
  50  */
  51 struct fdt_header *working_fdt;
  52
  53 void set_working_fdt_addr(void *addr)
  54 {
  55         char buf[17];
  56
  57         working_fdt = addr;
  58
  59         sprintf(buf, "%lx", (unsigned long)addr);
  60         setenv("fdtaddr", buf);
  61 }
  62
  63 /*
  64  * Flattened Device Tree command, see the help for parameter definitions.
  65  */
  66 int do_fdt (cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
  67 {
  68         if (argc < 2)
  69                 return CMD_RET_USAGE;
  70
  71         /*
  72          * Set the address of the fdt
  73          */
  74         if (argv[1][0] == 'a') {
  75                 unsigned long addr;
  76                 /*
  77                  * Set the address [and length] of the fdt.
  78                  */
  79                 if (argc == 2) {
  80                         if (!fdt_valid()) {
  81                                 return 1;
  82                         }
  83                         printf("The address of the fdt is %p\n", working_fdt);
  84                         return 0;
  85                 }
  86
  87                 addr = simple_strtoul(argv[2], NULL, 16);
  88                 set_working_fdt_addr((void *)addr);
  89
  90                 if (!fdt_valid()) {
  91                         return 1;
  92                 }
  93
  94                 if (argc >= 4) {
  95                         int  len;
  96                         int  err;
  97                         /*
  98                          * Optional new length
  99                          */
 100                         len = simple_strtoul(argv[3], NULL, 16);
 101                         if (len < fdt_totalsize(working_fdt)) {
 102                                 printf ("New length %d < existing length %d, "
 103                                         "ignoring.\n",
 104                                         len, fdt_totalsize(working_fdt));
 105                         } else {
 106                                 /*
 107                                  * Open in place with a new length.
 108                                  */
 109                                 err = fdt_open_into(working_fdt, working_fdt, len);
 110                                 if (err != 0) {
 111                                         printf ("libfdt fdt_open_into(): %s\n",
 112                                                 fdt_strerror(err));
 113                                 }
 114                         }
 115                 }
 116
 117                 return CMD_RET_SUCCESS;
 118         }
 119
 120         if (!working_fdt) {
 121                 puts(
 122                         "No FDT memory address configured. Please configure\n"
 123                         "the FDT address via \"fdt addr <address>\" command.\n"
 124                         "Aborting!\n");
 125                 return CMD_RET_FAILURE;
 126         }
 127
 128         /*
 129          * Move the working_fdt
 130          */
 131         if (strncmp(argv[1], "mo", 2) == 0) {
 132                 struct fdt_header *newaddr;
 133                 int  len;
 134                 int  err;
 135
 136                 if (argc < 4)
 137                         return CMD_RET_USAGE;
 138
 139                 /*
 140                  * Set the address and length of the fdt.
 141                  */
 142                 working_fdt = (struct fdt_header *)simple_strtoul(argv[2], NULL, 16);
 143                 if (!fdt_valid()) {
 144                         return 1;
 145                 }
 146
 147                 newaddr = (struct fdt_header *)simple_strtoul(argv[3],NULL,16);
 148
 149                 /*
 150                  * If the user specifies a length, use that.  Otherwise use the
 151                  * current length.
 152                  */
 153                 if (argc <= 4) {
 154                         len = fdt_totalsize(working_fdt);
 155                 } else {
 156                         len = simple_strtoul(argv[4], NULL, 16);
 157                         if (len < fdt_totalsize(working_fdt)) {
 158                                 printf ("New length 0x%X < existing length "
 159                                         "0x%X, aborting.\n",
 160                                         len, fdt_totalsize(working_fdt));
 161                                 return 1;
 162                         }
 163                 }
 164
 165                 /*
 166                  * Copy to the new location.
 167                  */
 168                 err = fdt_open_into(working_fdt, newaddr, len);
 169                 if (err != 0) {
 170                         printf ("libfdt fdt_open_into(): %s\n",
 171                                 fdt_strerror(err));
 172                         return 1;
 173                 }
 174                 working_fdt = newaddr;
 175
 176         /*
 177          * Make a new node
 178          */
 179         } else if (strncmp(argv[1], "mk", 2) == 0) {
 180                 char *pathp;            /* path */
 181                 char *nodep;            /* new node to add */
 182                 int  nodeoffset;        /* node offset from libfdt */
 183                 int  err;
 184
 185                 /*
 186                  * Parameters: Node path, new node to be appended to the path.
 187                  */
 188                 if (argc < 4)
 189                         return CMD_RET_USAGE;
 190
 191                 pathp = argv[2];
 192                 nodep = argv[3];
 193
 194                 nodeoffset = fdt_path_offset (working_fdt, pathp);
 195                 if (nodeoffset < 0) {
 196                         /*
 197                          * Not found or something else bad happened.
 198                          */
 199                         printf ("libfdt fdt_path_offset() returned %s\n",
 200                                 fdt_strerror(nodeoffset));
 201                         return 1;
 202                 }
 203                 err = fdt_add_subnode(working_fdt, nodeoffset, nodep);
 204                 if (err < 0) {
 205                         printf ("libfdt fdt_add_subnode(): %s\n",
 206                                 fdt_strerror(err));
 207                         return 1;
 208                 }
 209
 210         /*
 211          * Set the value of a property in the working_fdt.
 212          */
 213         } else if (argv[1][0] == 's') {
 214                 char *pathp;            /* path */
 215                 char *prop;             /* property */
 216                 int  nodeoffset;        /* node offset from libfdt */
 217                 static char data[SCRATCHPAD];   /* storage for the property */
 218                 int  len;               /* new length of the property */
 219                 int  ret;               /* return value */
 220
 221                 /*
 222                  * Parameters: Node path, property, optional value.
 223                  */
 224                 if (argc < 4)
 225                         return CMD_RET_USAGE;
 226
 227                 pathp  = argv[2];
 228                 prop   = argv[3];
 229                 if (argc == 4) {
 230                         len = 0;
 231                 } else {
 232                         ret = fdt_parse_prop(&argv[4], argc - 4, data, &len);
 233                         if (ret != 0)
 234                                 return ret;
 235                 }
 236
 237                 nodeoffset = fdt_path_offset (working_fdt, pathp);
 238                 if (nodeoffset < 0) {
 239                         /*
 240                          * Not found or something else bad happened.
 241                          */
 242                         printf ("libfdt fdt_path_offset() returned %s\n",
 243                                 fdt_strerror(nodeoffset));
 244                         return 1;
 245                 }
 246
 247                 ret = fdt_setprop(working_fdt, nodeoffset, prop, data, len);
 248                 if (ret < 0) {
 249                         printf ("libfdt fdt_setprop(): %s\n", fdt_strerror(ret));
 250                         return 1;
 251                 }
 252
 253         /*
 254          * Print (recursive) / List (single level)
 255          */
 256         } else if ((argv[1][0] == 'p') || (argv[1][0] == 'l')) {
 257                 int depth = MAX_LEVEL;  /* how deep to print */
 258                 char *pathp;            /* path */
 259                 char *prop;             /* property */
 260                 int  ret;               /* return value */
 261                 static char root[2] = "/";
 262
 263                 /*
 264                  * list is an alias for print, but limited to 1 level
 265                  */
 266                 if (argv[1][0] == 'l') {
 267                         depth = 1;
 268                 }
 269
 270                 /*
 271                  * Get the starting path.  The root node is an oddball,
 272                  * the offset is zero and has no name.
 273                  */
 274                 if (argc == 2)
 275                         pathp = root;
 276                 else
 277                         pathp = argv[2];
 278                 if (argc > 3)
 279                         prop = argv[3];
 280                 else
 281                         prop = NULL;
 282
 283                 ret = fdt_print(pathp, prop, depth);
 284                 if (ret != 0)
 285                         return ret;
 286
 287         /*
 288          * Remove a property/node
 289          */
 290         } else if (strncmp(argv[1], "rm", 2) == 0) {
 291                 int  nodeoffset;        /* node offset from libfdt */
 292                 int  err;
 293
 294                 /*
 295                  * Get the path.  The root node is an oddball, the offset
 296                  * is zero and has no name.
 297                  */
 298                 nodeoffset = fdt_path_offset (working_fdt, argv[2]);
 299                 if (nodeoffset < 0) {
 300                         /*
 301                          * Not found or something else bad happened.
 302                          */
 303                         printf ("libfdt fdt_path_offset() returned %s\n",
 304                                 fdt_strerror(nodeoffset));
 305                         return 1;
 306                 }
 307                 /*
 308                  * Do the delete.  A fourth parameter means delete a property,
 309                  * otherwise delete the node.
 310                  */
 311                 if (argc > 3) {
 312                         err = fdt_delprop(working_fdt, nodeoffset, argv[3]);
 313                         if (err < 0) {
 314                                 printf("libfdt fdt_delprop():  %s\n",
 315                                         fdt_strerror(err));
 316                                 return err;
 317                         }
 318                 } else {
 319                         err = fdt_del_node(working_fdt, nodeoffset);
 320                         if (err < 0) {
 321                                 printf("libfdt fdt_del_node():  %s\n",
 322                                         fdt_strerror(err));
 323                                 return err;
 324                         }
 325                 }
 326
 327         /*
 328          * Display header info
 329          */
 330         } else if (argv[1][0] == 'h') {
 331                 u32 version = fdt_version(working_fdt);
 332                 printf("magic:\t\t\t0x%x\n", fdt_magic(working_fdt));
 333                 printf("totalsize:\t\t0x%x (%d)\n", fdt_totalsize(working_fdt),
 334                        fdt_totalsize(working_fdt));
 335                 printf("off_dt_struct:\t\t0x%x\n",
 336                        fdt_off_dt_struct(working_fdt));
 337                 printf("off_dt_strings:\t\t0x%x\n",
 338                        fdt_off_dt_strings(working_fdt));
 339                 printf("off_mem_rsvmap:\t\t0x%x\n",
 340                        fdt_off_mem_rsvmap(working_fdt));
 341                 printf("version:\t\t%d\n", version);
 342                 printf("last_comp_version:\t%d\n",
 343                        fdt_last_comp_version(working_fdt));
 344                 if (version >= 2)
 345                         printf("boot_cpuid_phys:\t0x%x\n",
 346                                 fdt_boot_cpuid_phys(working_fdt));
 347                 if (version >= 3)
 348                         printf("size_dt_strings:\t0x%x\n",
 349                                 fdt_size_dt_strings(working_fdt));
 350                 if (version >= 17)
 351                         printf("size_dt_struct:\t\t0x%x\n",
 352                                 fdt_size_dt_struct(working_fdt));
 353                 printf("number mem_rsv:\t\t0x%x\n",
 354                        fdt_num_mem_rsv(working_fdt));
 355                 printf("\n");
 356
 357         /*
 358          * Set boot cpu id
 359          */
 360         } else if (strncmp(argv[1], "boo", 3) == 0) {
 361                 unsigned long tmp = simple_strtoul(argv[2], NULL, 16);
 362                 fdt_set_boot_cpuid_phys(working_fdt, tmp);
 363
 364         /*
 365          * memory command
 366          */
 367         } else if (strncmp(argv[1], "me", 2) == 0) {
 368                 uint64_t addr, size;
 369                 int err;
 370                 addr = simple_strtoull(argv[2], NULL, 16);
 371                 size = simple_strtoull(argv[3], NULL, 16);
 372                 err = fdt_fixup_memory(working_fdt, addr, size);
 373                 if (err < 0)
 374                         return err;
 375
 376         /*
 377          * mem reserve commands
 378          */
 379         } else if (strncmp(argv[1], "rs", 2) == 0) {
 380                 if (argv[2][0] == 'p') {
 381                         uint64_t addr, size;
 382                         int total = fdt_num_mem_rsv(working_fdt);
 383                         int j, err;
 384                         printf("index\t\t   start\t\t    size\n");
 385                         printf("-------------------------------"
 386                                 "-----------------\n");
 387                         for (j = 0; j < total; j++) {
 388                                 err = fdt_get_mem_rsv(working_fdt, j, &addr, &size);
 389                                 if (err < 0) {
 390                                         printf("libfdt fdt_get_mem_rsv():  %s\n",
 391                                                         fdt_strerror(err));
 392                                         return err;
 393                                 }
 394                                 printf("    %x\t%08x%08x\t%08x%08x\n", j,
 395                                         (u32)(addr >> 32),
 396                                         (u32)(addr & 0xffffffff),
 397                                         (u32)(size >> 32),
 398                                         (u32)(size & 0xffffffff));
 399                         }
 400                 } else if (argv[2][0] == 'a') {
 401                         uint64_t addr, size;
 402                         int err;
 403                         addr = simple_strtoull(argv[3], NULL, 16);
 404                         size = simple_strtoull(argv[4], NULL, 16);
 405                         err = fdt_add_mem_rsv(working_fdt, addr, size);
 406
 407                         if (err < 0) {
 408                                 printf("libfdt fdt_add_mem_rsv():  %s\n",
 409                                         fdt_strerror(err));
 410                                 return err;
 411                         }
 412                 } else if (argv[2][0] == 'd') {
 413                         unsigned long idx = simple_strtoul(argv[3], NULL, 16);
 414                         int err = fdt_del_mem_rsv(working_fdt, idx);
 415
 416                         if (err < 0) {
 417                                 printf("libfdt fdt_del_mem_rsv():  %s\n",
 418                                         fdt_strerror(err));
 419                                 return err;
 420                         }
 421                 } else {
 422                         /* Unrecognized command */
 423                         return CMD_RET_USAGE;
 424                 }
 425         }
 426 #ifdef CONFIG_OF_BOARD_SETUP
 427         /* Call the board-specific fixup routine */
 428         else if (strncmp(argv[1], "boa", 3) == 0)
 429                 ft_board_setup(working_fdt, gd->bd);
 430 #endif
 431         /* Create a chosen node */
 432         else if (argv[1][0] == 'c') {
 433                 unsigned long initrd_start = 0, initrd_end = 0;
 434
 435                 if ((argc != 2) && (argc != 4))
 436                         return CMD_RET_USAGE;
 437
 438                 if (argc == 4) {
 439                         initrd_start = simple_strtoul(argv[2], NULL, 16);
 440                         initrd_end = simple_strtoul(argv[3], NULL, 16);
 441                 }
 442
 443                 fdt_chosen(working_fdt, 1);
 444                 fdt_initrd(working_fdt, initrd_start, initrd_end, 1);
 445         }
 446         /* resize the fdt */
 447         else if (strncmp(argv[1], "re", 2) == 0) {
 448                 fdt_resize(working_fdt);
 449         }
 450         else {
 451                 /* Unrecognized command */
 452                 return CMD_RET_USAGE;
 453         }
 454
 455         return 0;
 456 }
 457
 458 /****************************************************************************/
 459
 460 static int fdt_valid(void)
 461 {
 462         int  err;
 463
 464         if (working_fdt == NULL) {
 465                 printf ("The address of the fdt is invalid (NULL).\n");
 466                 return 0;
 467         }
 468
 469         err = fdt_check_header(working_fdt);
 470         if (err == 0)
 471                 return 1;       /* valid */
 472
 473         if (err < 0) {
 474                 printf("libfdt fdt_check_header(): %s", fdt_strerror(err));
 475                 /*
 476                  * Be more informative on bad version.
 477                  */
 478                 if (err == -FDT_ERR_BADVERSION) {
 479                         if (fdt_version(working_fdt) <
 480                             FDT_FIRST_SUPPORTED_VERSION) {
 481                                 printf (" - too old, fdt %d < %d",
 482                                         fdt_version(working_fdt),
 483                                         FDT_FIRST_SUPPORTED_VERSION);
 484                                 working_fdt = NULL;
 485                         }
 486                         if (fdt_last_comp_version(working_fdt) >
 487                             FDT_LAST_SUPPORTED_VERSION) {
 488                                 printf (" - too new, fdt %d > %d",
 489                                         fdt_version(working_fdt),
 490                                         FDT_LAST_SUPPORTED_VERSION);
 491                                 working_fdt = NULL;
 492                         }
 493                         return 0;
 494                 }
 495                 printf("\n");
 496                 return 0;
 497         }
 498         return 1;
 499 }
 500
 501 /****************************************************************************/
 502
 503 /*
 504  * Parse the user's input, partially heuristic.  Valid formats:
 505  * <0x00112233 4 05>    - an array of cells.  Numbers follow standard
 506  *                      C conventions.
 507  * [00 11 22 .. nn] - byte stream
 508  * "string"     - If the the value doesn't start with "<" or "[", it is
 509  *                      treated as a string.  Note that the quotes are
 510  *                      stripped by the parser before we get the string.
 511  * newval: An array of strings containing the new property as specified
 512  *      on the command line
 513  * count: The number of strings in the array
 514  * data: A bytestream to be placed in the property
 515  * len: The length of the resulting bytestream
 516  */
 517 static int fdt_parse_prop(char * const *newval, int count, char *data, int *len)
 518 {
 519         char *cp;               /* temporary char pointer */
 520         char *newp;             /* temporary newval char pointer */
 521         unsigned long tmp;      /* holds converted values */
 522         int stridx = 0;
 523
 524         *len = 0;
 525         newp = newval[0];
 526
 527         /* An array of cells */
 528         if (*newp == '<') {
 529                 newp++;
 530                 while ((*newp != '>') && (stridx < count)) {
 531                         /*
 532                          * Keep searching until we find that last ">"
 533                          * That way users don't have to escape the spaces
 534                          */
 535                         if (*newp == '\0') {
 536                                 newp = newval[++stridx];
 537                                 continue;
 538                         }
 539
 540                         cp = newp;
 541                         tmp = simple_strtoul(cp, &newp, 0);
 542                         *(uint32_t *)data = __cpu_to_be32(tmp);
 543                         data  += 4;
 544                         *len += 4;
 545
 546                         /* If the ptr didn't advance, something went wrong */
 547                         if ((newp - cp) <= 0) {
 548                                 printf("Sorry, I could not convert \"%s\"\n",
 549                                         cp);
 550                                 return 1;
 551                         }
 552
 553                         while (*newp == ' ')
 554                                 newp++;
 555                 }
 556
 557                 if (*newp != '>') {
 558                         printf("Unexpected character '%c'\n", *newp);
 559                         return 1;
 560                 }
 561         } else if (*newp == '[') {
 562                 /*
 563                  * Byte stream.  Convert the values.
 564                  */
 565                 newp++;
 566                 while ((stridx < count) && (*newp != ']')) {
 567                         while (*newp == ' ')
 568                                 newp++;
 569                         if (*newp == '\0') {
 570                                 newp = newval[++stridx];
 571                                 continue;
 572                         }
 573                         if (!isxdigit(*newp))
 574                                 break;
 575                         tmp = simple_strtoul(newp, &newp, 16);
 576                         *data++ = tmp & 0xFF;
 577                         *len    = *len + 1;
 578                 }
 579                 if (*newp != ']') {
 580                         printf("Unexpected character '%c'\n", *newp);
 581                         return 1;
 582                 }
 583         } else {
 584                 /*
 585                  * Assume it is one or more strings.  Copy it into our
 586                  * data area for convenience (including the
 587                  * terminating '\0's).
 588                  */
 589                 while (stridx < count) {
 590                         size_t length = strlen(newp) + 1;
 591                         strcpy(data, newp);
 592                         data += length;
 593                         *len += length;
 594                         newp = newval[++stridx];
 595                 }
 596         }
 597         return 0;
 598 }
 599
 600 /****************************************************************************/
 601
 602 /*
 603  * Heuristic to guess if this is a string or concatenated strings.
 604  */
 605
 606 static int is_printable_string(const void *data, int len)
 607 {
 608         const char *s = data;
 609
 610         /* zero length is not */
 611         if (len == 0)
 612                 return 0;
 613
 614         /* must terminate with zero */
 615         if (s[len - 1] != '\0')
 616                 return 0;
 617
 618         /* printable or a null byte (concatenated strings) */
 619         while (((*s == '\0') || isprint(*s)) && (len > 0)) {
 620                 /*
 621                  * If we see a null, there are three possibilities:
 622                  * 1) If len == 1, it is the end of the string, printable
 623                  * 2) Next character also a null, not printable.
 624                  * 3) Next character not a null, continue to check.
 625                  */
 626                 if (s[0] == '\0') {
 627                         if (len == 1)
 628                                 return 1;
 629                         if (s[1] == '\0')
 630                                 return 0;
 631                 }
 632                 s++;
 633                 len--;
 634         }
 635
 636         /* Not the null termination, or not done yet: not printable */
 637         if (*s != '\0' || (len != 0))
 638                 return 0;
 639
 640         return 1;
 641 }
 642
 643
 644 /*
 645  * Print the property in the best format, a heuristic guess.  Print as
 646  * a string, concatenated strings, a byte, word, double word, or (if all
 647  * else fails) it is printed as a stream of bytes.
 648  */
 649 static void print_data(const void *data, int len)
 650 {
 651         int j;
 652
 653         /* no data, don't print */
 654         if (len == 0)
 655                 return;
 656
 657         /*
 658          * It is a string, but it may have multiple strings (embedded '\0's).
 659          */
 660         if (is_printable_string(data, len)) {
 661                 puts("\"");
 662                 j = 0;
 663                 while (j < len) {
 664                         if (j > 0)
 665                                 puts("\", \"");
 666                         puts(data);
 667                         j    += strlen(data) + 1;
 668                         data += strlen(data) + 1;
 669                 }
 670                 puts("\"");
 671                 return;
 672         }
 673
 674         if ((len %4) == 0) {
 675                 const u32 *p;
 676
 677                 printf("<");
 678                 for (j = 0, p = data; j < len/4; j ++)
 679                         printf("0x%x%s", fdt32_to_cpu(p[j]), j < (len/4 - 1) ? " " : "");
 680                 printf(">");
 681         } else { /* anything else... hexdump */
 682                 const u8 *s;
 683
 684                 printf("[");
 685                 for (j = 0, s = data; j < len; j++)
 686                         printf("%02x%s", s[j], j < len - 1 ? " " : "");
 687                 printf("]");
 688         }
 689 }
 690
 691 /****************************************************************************/
 692
 693 /*
 694  * Recursively print (a portion of) the working_fdt.  The depth parameter
 695  * determines how deeply nested the fdt is printed.
 696  */
 697 static int fdt_print(const char *pathp, char *prop, int depth)
 698 {
 699         static char tabs[MAX_LEVEL+1] =
 700                 "\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t"
 701                 "\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t";
 702         const void *nodep;      /* property node pointer */
 703         int  nodeoffset;        /* node offset from libfdt */
 704         int  nextoffset;        /* next node offset from libfdt */
 705         uint32_t tag;           /* tag */
 706         int  len;               /* length of the property */
 707         int  level = 0;         /* keep track of nesting level */
 708         const struct fdt_property *fdt_prop;
 709
 710         nodeoffset = fdt_path_offset (working_fdt, pathp);
 711         if (nodeoffset < 0) {
 712                 /*
 713                  * Not found or something else bad happened.
 714                  */
 715                 printf ("libfdt fdt_path_offset() returned %s\n",
 716                         fdt_strerror(nodeoffset));
 717                 return 1;
 718         }
 719         /*
 720          * The user passed in a property as well as node path.
 721          * Print only the given property and then return.
 722          */
 723         if (prop) {
 724                 nodep = fdt_getprop (working_fdt, nodeoffset, prop, &len);
 725                 if (len == 0) {
 726                         /* no property value */
 727                         printf("%s %s\n", pathp, prop);
 728                         return 0;
 729                 } else if (len > 0) {
 730                         printf("%s = ", prop);
 731                         print_data (nodep, len);
 732                         printf("\n");
 733                         return 0;
 734                 } else {
 735                         printf ("libfdt fdt_getprop(): %s\n",
 736                                 fdt_strerror(len));
 737                         return 1;
 738                 }
 739         }
 740
 741         /*
 742          * The user passed in a node path and no property,
 743          * print the node and all subnodes.
 744          */
 745         while(level >= 0) {
 746                 tag = fdt_next_tag(working_fdt, nodeoffset, &nextoffset);
 747                 switch(tag) {
 748                 case FDT_BEGIN_NODE:
 749                         pathp = fdt_get_name(working_fdt, nodeoffset, NULL);
 750                         if (level <= depth) {
 751                                 if (pathp == NULL)
 752                                         pathp = "/* NULL pointer error */";
 753                                 if (*pathp == '\0')
 754                                         pathp = "/";    /* root is nameless */
 755                                 printf("%s%s {\n",
 756                                         &tabs[MAX_LEVEL - level], pathp);
 757                         }
 758                         level++;
 759                         if (level >= MAX_LEVEL) {
 760                                 printf("Nested too deep, aborting.\n");
 761                                 return 1;
 762                         }
 763                         break;
 764                 case FDT_END_NODE:
 765                         level--;
 766                         if (level <= depth)
 767                                 printf("%s};\n", &tabs[MAX_LEVEL - level]);
 768                         if (level == 0) {
 769                                 level = -1;             /* exit the loop */
 770                         }
 771                         break;
 772                 case FDT_PROP:
 773                         fdt_prop = fdt_offset_ptr(working_fdt, nodeoffset,
 774                                         sizeof(*fdt_prop));
 775                         pathp    = fdt_string(working_fdt,
 776                                         fdt32_to_cpu(fdt_prop->nameoff));
 777                         len      = fdt32_to_cpu(fdt_prop->len);
 778                         nodep    = fdt_prop->data;
 779                         if (len < 0) {
 780                                 printf ("libfdt fdt_getprop(): %s\n",
 781                                         fdt_strerror(len));
 782                                 return 1;
 783                         } else if (len == 0) {
 784                                 /* the property has no value */
 785                                 if (level <= depth)
 786                                         printf("%s%s;\n",
 787                                                 &tabs[MAX_LEVEL - level],
 788                                                 pathp);
 789                         } else {
 790                                 if (level <= depth) {
 791                                         printf("%s%s = ",
 792                                                 &tabs[MAX_LEVEL - level],
 793                                                 pathp);
 794                                         print_data (nodep, len);
 795                                         printf(";\n");
 796                                 }
 797                         }
 798                         break;
 799                 case FDT_NOP:
 800                         printf("%s/* NOP */\n", &tabs[MAX_LEVEL - level]);
 801                         break;
 802                 case FDT_END:
 803                         return 1;
 804                 default:
 805                         if (level <= depth)
 806                                 printf("Unknown tag 0x%08X\n", tag);
 807                         return 1;
 808                 }
 809                 nodeoffset = nextoffset;
 810         }
 811         return 0;
 812 }
 813
 814 /********************************************************************/
 815
 816 U_BOOT_CMD(
 817         fdt,    255,    0,      do_fdt,
 818         "flattened device tree utility commands",
 819             "addr   <addr> [<length>]        - Set the fdt location to <addr>\n"
 820 #ifdef CONFIG_OF_BOARD_SETUP
 821         "fdt boardsetup                      - Do board-specific set up\n"
 822 #endif
 823         "fdt move   <fdt> <newaddr> <length> - Copy the fdt to <addr> and make it active\n"
 824         "fdt resize                          - Resize fdt to size + padding to 4k addr\n"
 825         "fdt print  <path> [<prop>]          - Recursive print starting at <path>\n"
 826         "fdt list   <path> [<prop>]          - Print one level starting at <path>\n"
 827         "fdt set    <path> <prop> [<val>]    - Set <property> [to <val>]\n"
 828         "fdt mknode <path> <node>            - Create a new node after <path>\n"
 829         "fdt rm     <path> [<prop>]          - Delete the node or <property>\n"
 830         "fdt header                          - Display header info\n"
 831         "fdt bootcpu <id>                    - Set boot cpuid\n"
 832         "fdt memory <addr> <size>            - Add/Update memory node\n"
 833         "fdt rsvmem print                    - Show current mem reserves\n"
 834         "fdt rsvmem add <addr> <size>        - Add a mem reserve\n"
 835         "fdt rsvmem delete <index>           - Delete a mem reserves\n"
 836         "fdt chosen [<start> <end>]          - Add/update the /chosen branch in the tree\n"
 837         "                                        <start>/<end> - initrd start/end addr\n"
 838         "NOTE: Dereference aliases by omiting the leading '/', "
 839                 "e.g. fdt print ethernet0."
 840 );