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