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  * The working_fdt points to our working flattened device tree.
  50  */
  51 struct fdt_header *working_fdt;
  52
  53 /*
  54  * Flattened Device Tree command, see the help for parameter definitions.
  55  */
  56 int do_fdt (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
  57 {
  58         if (argc < 2) {
  59                 printf ("Usage:\n%s\n", cmdtp->usage);
  60                 return 1;
  61         }
  62
  63         /********************************************************************
  64          * Set the address of the fdt
  65          ********************************************************************/
  66         if (argv[1][0] == 'a') {
  67                 /*
  68                  * Set the address [and length] of the fdt.
  69                  */
  70                 working_fdt = (struct fdt_header *)simple_strtoul(argv[2], NULL, 16);
  71
  72                 if (!fdt_valid()) {
  73                         return 1;
  74                 }
  75
  76                 if (argc >= 4) {
  77                         int  len;
  78                         int  err;
  79                         /*
  80                          * Optional new length
  81                          */
  82                         len = simple_strtoul(argv[3], NULL, 16);
  83                         if (len < fdt_totalsize(working_fdt)) {
  84                                 printf ("New length %d < existing length %d, "
  85                                         "ignoring.\n",
  86                                         len, fdt_totalsize(working_fdt));
  87                         } else {
  88                                 /*
  89                                  * Open in place with a new length.
  90                                  */
  91                                 err = fdt_open_into(working_fdt, working_fdt, len);
  92                                 if (err != 0) {
  93                                         printf ("libfdt fdt_open_into(): %s\n",
  94                                                 fdt_strerror(err));
  95                                 }
  96                         }
  97                 }
  98
  99         /********************************************************************
 100          * Move the working_fdt
 101          ********************************************************************/
 102         } else if (strncmp(argv[1], "mo", 2) == 0) {
 103                 struct fdt_header *newaddr;
 104                 int  len;
 105                 int  err;
 106
 107                 if (argc < 4) {
 108                         printf ("Usage:\n%s\n", cmdtp->usage);
 109                         return 1;
 110                 }
 111
 112                 /*
 113                  * Set the address and length of the fdt.
 114                  */
 115                 working_fdt = (struct fdt_header *)simple_strtoul(argv[2], NULL, 16);
 116                 if (!fdt_valid()) {
 117                         return 1;
 118                 }
 119
 120                 newaddr = (struct fdt_header *)simple_strtoul(argv[3],NULL,16);
 121
 122                 /*
 123                  * If the user specifies a length, use that.  Otherwise use the
 124                  * current length.
 125                  */
 126                 if (argc <= 4) {
 127                         len = fdt_totalsize(working_fdt);
 128                 } else {
 129                         len = simple_strtoul(argv[4], NULL, 16);
 130                         if (len < fdt_totalsize(working_fdt)) {
 131                                 printf ("New length 0x%X < existing length "
 132                                         "0x%X, aborting.\n",
 133                                         len, fdt_totalsize(working_fdt));
 134                                 return 1;
 135                         }
 136                 }
 137
 138                 /*
 139                  * Copy to the new location.
 140                  */
 141                 err = fdt_open_into(working_fdt, newaddr, len);
 142                 if (err != 0) {
 143                         printf ("libfdt fdt_open_into(): %s\n",
 144                                 fdt_strerror(err));
 145                         return 1;
 146                 }
 147                 working_fdt = newaddr;
 148
 149         /********************************************************************
 150          * Make a new node
 151          ********************************************************************/
 152         } else if (strncmp(argv[1], "mk", 2) == 0) {
 153                 char *pathp;            /* path */
 154                 char *nodep;            /* new node to add */
 155                 int  nodeoffset;        /* node offset from libfdt */
 156                 int  err;
 157
 158                 /*
 159                  * Parameters: Node path, new node to be appended to the path.
 160                  */
 161                 if (argc < 4) {
 162                         printf ("Usage:\n%s\n", cmdtp->usage);
 163                         return 1;
 164                 }
 165
 166                 pathp = argv[2];
 167                 nodep = argv[3];
 168
 169                 nodeoffset = fdt_path_offset (working_fdt, pathp);
 170                 if (nodeoffset < 0) {
 171                         /*
 172                          * Not found or something else bad happened.
 173                          */
 174                         printf ("libfdt fdt_path_offset() returned %s\n",
 175                                 fdt_strerror(nodeoffset));
 176                         return 1;
 177                 }
 178                 err = fdt_add_subnode(working_fdt, nodeoffset, nodep);
 179                 if (err < 0) {
 180                         printf ("libfdt fdt_add_subnode(): %s\n",
 181                                 fdt_strerror(err));
 182                         return 1;
 183                 }
 184
 185         /********************************************************************
 186          * Set the value of a property in the working_fdt.
 187          ********************************************************************/
 188         } else if (argv[1][0] == 's') {
 189                 char *pathp;            /* path */
 190                 char *prop;             /* property */
 191                 int  nodeoffset;        /* node offset from libfdt */
 192                 static char data[SCRATCHPAD];   /* storage for the property */
 193                 int  len;               /* new length of the property */
 194                 int  ret;               /* return value */
 195
 196                 /*
 197                  * Parameters: Node path, property, optional value.
 198                  */
 199                 if (argc < 4) {
 200                         printf ("Usage:\n%s\n", cmdtp->usage);
 201                         return 1;
 202                 }
 203
 204                 pathp  = argv[2];
 205                 prop   = argv[3];
 206                 if (argc == 4) {
 207                         len = 0;
 208                 } else {
 209                         ret = fdt_parse_prop(&argv[4], argc - 4, data, &len);
 210                         if (ret != 0)
 211                                 return ret;
 212                 }
 213
 214                 nodeoffset = fdt_path_offset (working_fdt, pathp);
 215                 if (nodeoffset < 0) {
 216                         /*
 217                          * Not found or something else bad happened.
 218                          */
 219                         printf ("libfdt fdt_path_offset() returned %s\n",
 220                                 fdt_strerror(nodeoffset));
 221                         return 1;
 222                 }
 223
 224                 ret = fdt_setprop(working_fdt, nodeoffset, prop, data, len);
 225                 if (ret < 0) {
 226                         printf ("libfdt fdt_setprop(): %s\n", fdt_strerror(ret));
 227                         return 1;
 228                 }
 229
 230         /********************************************************************
 231          * Print (recursive) / List (single level)
 232          ********************************************************************/
 233         } else if ((argv[1][0] == 'p') || (argv[1][0] == 'l')) {
 234                 int depth = MAX_LEVEL;  /* how deep to print */
 235                 char *pathp;            /* path */
 236                 char *prop;             /* property */
 237                 int  ret;               /* return value */
 238                 static char root[2] = "/";
 239
 240                 /*
 241                  * list is an alias for print, but limited to 1 level
 242                  */
 243                 if (argv[1][0] == 'l') {
 244                         depth = 1;
 245                 }
 246
 247                 /*
 248                  * Get the starting path.  The root node is an oddball,
 249                  * the offset is zero and has no name.
 250                  */
 251                 if (argc == 2)
 252                         pathp = root;
 253                 else
 254                         pathp = argv[2];
 255                 if (argc > 3)
 256                         prop = argv[3];
 257                 else
 258                         prop = NULL;
 259
 260                 ret = fdt_print(pathp, prop, depth);
 261                 if (ret != 0)
 262                         return ret;
 263
 264         /********************************************************************
 265          * Remove a property/node
 266          ********************************************************************/
 267         } else if (strncmp(argv[1], "rm", 2) == 0) {
 268                 int  nodeoffset;        /* node offset from libfdt */
 269                 int  err;
 270
 271                 /*
 272                  * Get the path.  The root node is an oddball, the offset
 273                  * is zero and has no name.
 274                  */
 275                 nodeoffset = fdt_path_offset (working_fdt, argv[2]);
 276                 if (nodeoffset < 0) {
 277                         /*
 278                          * Not found or something else bad happened.
 279                          */
 280                         printf ("libfdt fdt_path_offset() returned %s\n",
 281                                 fdt_strerror(nodeoffset));
 282                         return 1;
 283                 }
 284                 /*
 285                  * Do the delete.  A fourth parameter means delete a property,
 286                  * otherwise delete the node.
 287                  */
 288                 if (argc > 3) {
 289                         err = fdt_delprop(working_fdt, nodeoffset, argv[3]);
 290                         if (err < 0) {
 291                                 printf("libfdt fdt_delprop():  %s\n",
 292                                         fdt_strerror(err));
 293                                 return err;
 294                         }
 295                 } else {
 296                         err = fdt_del_node(working_fdt, nodeoffset);
 297                         if (err < 0) {
 298                                 printf("libfdt fdt_del_node():  %s\n",
 299                                         fdt_strerror(err));
 300                                 return err;
 301                         }
 302                 }
 303
 304         /********************************************************************
 305          * Display header info
 306          ********************************************************************/
 307         } else if (argv[1][0] == 'h') {
 308                 u32 version = fdt_version(working_fdt);
 309                 printf("magic:\t\t\t0x%x\n", fdt_magic(working_fdt));
 310                 printf("totalsize:\t\t0x%x (%d)\n", fdt_totalsize(working_fdt),
 311                        fdt_totalsize(working_fdt));
 312                 printf("off_dt_struct:\t\t0x%x\n",
 313                        fdt_off_dt_struct(working_fdt));
 314                 printf("off_dt_strings:\t\t0x%x\n",
 315                        fdt_off_dt_strings(working_fdt));
 316                 printf("off_mem_rsvmap:\t\t0x%x\n",
 317                        fdt_off_mem_rsvmap(working_fdt));
 318                 printf("version:\t\t%d\n", version);
 319                 printf("last_comp_version:\t%d\n",
 320                        fdt_last_comp_version(working_fdt));
 321                 if (version >= 2)
 322                         printf("boot_cpuid_phys:\t0x%x\n",
 323                                 fdt_boot_cpuid_phys(working_fdt));
 324                 if (version >= 3)
 325                         printf("size_dt_strings:\t0x%x\n",
 326                                 fdt_size_dt_strings(working_fdt));
 327                 if (version >= 17)
 328                         printf("size_dt_struct:\t\t0x%x\n",
 329                                 fdt_size_dt_struct(working_fdt));
 330                 printf("number mem_rsv:\t\t0x%x\n",
 331                        fdt_num_mem_rsv(working_fdt));
 332                 printf("\n");
 333
 334         /********************************************************************
 335          * Set boot cpu id
 336          ********************************************************************/
 337         } else if (strncmp(argv[1], "boo", 3) == 0) {
 338                 unsigned long tmp = simple_strtoul(argv[2], NULL, 16);
 339                 fdt_set_boot_cpuid_phys(working_fdt, tmp);
 340
 341         /********************************************************************
 342          * memory command
 343          ********************************************************************/
 344         } else if (strncmp(argv[1], "me", 2) == 0) {
 345                 uint64_t addr, size;
 346                 int err;
 347 #ifdef CFG_64BIT_STRTOUL
 348                         addr = simple_strtoull(argv[2], NULL, 16);
 349                         size = simple_strtoull(argv[3], NULL, 16);
 350 #else
 351                         addr = simple_strtoul(argv[2], NULL, 16);
 352                         size = simple_strtoul(argv[3], NULL, 16);
 353 #endif
 354                 err = fdt_fixup_memory(working_fdt, addr, size);
 355                 if (err < 0)
 356                         return err;
 357
 358         /********************************************************************
 359          * mem reserve commands
 360          ********************************************************************/
 361         } else if (strncmp(argv[1], "rs", 2) == 0) {
 362                 if (argv[2][0] == 'p') {
 363                         uint64_t addr, size;
 364                         int total = fdt_num_mem_rsv(working_fdt);
 365                         int j, err;
 366                         printf("index\t\t   start\t\t    size\n");
 367                         printf("-------------------------------"
 368                                 "-----------------\n");
 369                         for (j = 0; j < total; j++) {
 370                                 err = fdt_get_mem_rsv(working_fdt, j, &addr, &size);
 371                                 if (err < 0) {
 372                                         printf("libfdt fdt_get_mem_rsv():  %s\n",
 373                                                         fdt_strerror(err));
 374                                         return err;
 375                                 }
 376                                 printf("    %x\t%08x%08x\t%08x%08x\n", j,
 377                                         (u32)(addr >> 32),
 378                                         (u32)(addr & 0xffffffff),
 379                                         (u32)(size >> 32),
 380                                         (u32)(size & 0xffffffff));
 381                         }
 382                 } else if (argv[2][0] == 'a') {
 383                         uint64_t addr, size;
 384                         int err;
 385 #ifdef CFG_64BIT_STRTOUL
 386                         addr = simple_strtoull(argv[3], NULL, 16);
 387                         size = simple_strtoull(argv[4], NULL, 16);
 388 #else
 389                         addr = simple_strtoul(argv[3], NULL, 16);
 390                         size = simple_strtoul(argv[4], NULL, 16);
 391 #endif
 392                         err = fdt_add_mem_rsv(working_fdt, addr, size);
 393
 394                         if (err < 0) {
 395                                 printf("libfdt fdt_add_mem_rsv():  %s\n",
 396                                         fdt_strerror(err));
 397                                 return err;
 398                         }
 399                 } else if (argv[2][0] == 'd') {
 400                         unsigned long idx = simple_strtoul(argv[3], NULL, 16);
 401                         int err = fdt_del_mem_rsv(working_fdt, idx);
 402
 403                         if (err < 0) {
 404                                 printf("libfdt fdt_del_mem_rsv():  %s\n",
 405                                         fdt_strerror(err));
 406                                 return err;
 407                         }
 408                 } else {
 409                         /* Unrecognized command */
 410                         printf ("Usage:\n%s\n", cmdtp->usage);
 411                         return 1;
 412                 }
 413         }
 414 #ifdef CONFIG_OF_BOARD_SETUP
 415         /* Call the board-specific fixup routine */
 416         else if (strncmp(argv[1], "boa", 3) == 0)
 417                 ft_board_setup(working_fdt, gd->bd);
 418 #endif
 419         /* Create a chosen node */
 420         else if (argv[1][0] == 'c') {
 421                 unsigned long initrd_start = 0, initrd_end = 0;
 422
 423                 if ((argc != 2) && (argc != 4)) {
 424                         printf ("Usage:\n%s\n", cmdtp->usage);
 425                         return 1;
 426                 }
 427
 428                 if (argc == 4) {
 429                         initrd_start = simple_strtoul(argv[2], NULL, 16);
 430                         initrd_end = simple_strtoul(argv[3], NULL, 16);
 431                 }
 432
 433                 fdt_chosen(working_fdt, initrd_start, initrd_end, 1);
 434         } else {
 435                 /* Unrecognized command */
 436                 printf ("Usage:\n%s\n", cmdtp->usage);
 437                 return 1;
 438         }
 439
 440         return 0;
 441 }
 442
 443 /****************************************************************************/
 444
 445 static int fdt_valid(void)
 446 {
 447         int  err;
 448
 449         if (working_fdt == NULL) {
 450                 printf ("The address of the fdt is invalid (NULL).\n");
 451                 return 0;
 452         }
 453
 454         err = fdt_check_header(working_fdt);
 455         if (err == 0)
 456                 return 1;       /* valid */
 457
 458         if (err < 0) {
 459                 printf("libfdt fdt_check_header(): %s", fdt_strerror(err));
 460                 /*
 461                  * Be more informative on bad version.
 462                  */
 463                 if (err == -FDT_ERR_BADVERSION) {
 464                         if (fdt_version(working_fdt) <
 465                             FDT_FIRST_SUPPORTED_VERSION) {
 466                                 printf (" - too old, fdt %d < %d",
 467                                         fdt_version(working_fdt),
 468                                         FDT_FIRST_SUPPORTED_VERSION);
 469                                 working_fdt = NULL;
 470                         }
 471                         if (fdt_last_comp_version(working_fdt) >
 472                             FDT_LAST_SUPPORTED_VERSION) {
 473                                 printf (" - too new, fdt %d > %d",
 474                                         fdt_version(working_fdt),
 475                                         FDT_LAST_SUPPORTED_VERSION);
 476                                 working_fdt = NULL;
 477                         }
 478                         return 0;
 479                 }
 480                 printf("\n");
 481                 return 0;
 482         }
 483         return 1;
 484 }
 485
 486 /****************************************************************************/
 487
 488 /*
 489  * Parse the user's input, partially heuristic.  Valid formats:
 490  * <0x00112233 4 05>    - an array of cells.  Numbers follow standard
 491  *                      C conventions.
 492  * [00 11 22 .. nn] - byte stream
 493  * "string"     - If the the value doesn't start with "<" or "[", it is
 494  *                      treated as a string.  Note that the quotes are
 495  *                      stripped by the parser before we get the string.
 496  * newval: An array of strings containing the new property as specified
 497  *      on the command line
 498  * count: The number of strings in the array
 499  * data: A bytestream to be placed in the property
 500  * len: The length of the resulting bytestream
 501  */
 502 static int fdt_parse_prop(char **newval, int count, char *data, int *len)
 503 {
 504         char *cp;               /* temporary char pointer */
 505         char *newp;             /* temporary newval char pointer */
 506         unsigned long tmp;      /* holds converted values */
 507         int stridx = 0;
 508
 509         *len = 0;
 510         newp = newval[0];
 511
 512         /* An array of cells */
 513         if (*newp == '<') {
 514                 newp++;
 515                 while ((*newp != '>') && (stridx < count)) {
 516                         /*
 517                          * Keep searching until we find that last ">"
 518                          * That way users don't have to escape the spaces
 519                          */
 520                         if (*newp == '\0') {
 521                                 newp = newval[++stridx];
 522                                 continue;
 523                         }
 524
 525                         cp = newp;
 526                         tmp = simple_strtoul(cp, &newp, 0);
 527                         *(uint32_t *)data = __cpu_to_be32(tmp);
 528                         data  += 4;
 529                         *len += 4;
 530
 531                         /* If the ptr didn't advance, something went wrong */
 532                         if ((newp - cp) <= 0) {
 533                                 printf("Sorry, I could not convert \"%s\"\n",
 534                                         cp);
 535                                 return 1;
 536                         }
 537
 538                         while (*newp == ' ')
 539                                 newp++;
 540                 }
 541
 542                 if (*newp != '>') {
 543                         printf("Unexpected character '%c'\n", *newp);
 544                         return 1;
 545                 }
 546         } else if (*newp == '[') {
 547                 /*
 548                  * Byte stream.  Convert the values.
 549                  */
 550                 newp++;
 551                 while ((*newp != ']') && (stridx < count)) {
 552                         tmp = simple_strtoul(newp, &newp, 16);
 553                         *data++ = tmp & 0xFF;
 554                         *len    = *len + 1;
 555                         while (*newp == ' ')
 556                                 newp++;
 557                         if (*newp != '\0')
 558                                 newp = newval[++stridx];
 559                 }
 560                 if (*newp != ']') {
 561                         printf("Unexpected character '%c'\n", *newp);
 562                         return 1;
 563                 }
 564         } else {
 565                 /*
 566                  * Assume it is a string.  Copy it into our data area for
 567                  * convenience (including the terminating '\0').
 568                  */
 569                 while (stridx < count) {
 570                         *len = strlen(newp) + 1;
 571                         strcpy(data, newp);
 572                         newp = newval[++stridx];
 573                 }
 574         }
 575         return 0;
 576 }
 577
 578 /****************************************************************************/
 579
 580 /*
 581  * Heuristic to guess if this is a string or concatenated strings.
 582  */
 583
 584 static int is_printable_string(const void *data, int len)
 585 {
 586         const char *s = data;
 587
 588         /* zero length is not */
 589         if (len == 0)
 590                 return 0;
 591
 592         /* must terminate with zero */
 593         if (s[len - 1] != '\0')
 594                 return 0;
 595
 596         /* printable or a null byte (concatenated strings) */
 597         while (((*s == '\0') || isprint(*s)) && (len > 0)) {
 598                 /*
 599                  * If we see a null, there are three possibilities:
 600                  * 1) If len == 1, it is the end of the string, printable
 601                  * 2) Next character also a null, not printable.
 602                  * 3) Next character not a null, continue to check.
 603                  */
 604                 if (s[0] == '\0') {
 605                         if (len == 1)
 606                                 return 1;
 607                         if (s[1] == '\0')
 608                                 return 0;
 609                 }
 610                 s++;
 611                 len--;
 612         }
 613
 614         /* Not the null termination, or not done yet: not printable */
 615         if (*s != '\0' || (len != 0))
 616                 return 0;
 617
 618         return 1;
 619 }
 620
 621
 622 /*
 623  * Print the property in the best format, a heuristic guess.  Print as
 624  * a string, concatenated strings, a byte, word, double word, or (if all
 625  * else fails) it is printed as a stream of bytes.
 626  */
 627 static void print_data(const void *data, int len)
 628 {
 629         int j;
 630
 631         /* no data, don't print */
 632         if (len == 0)
 633                 return;
 634
 635         /*
 636          * It is a string, but it may have multiple strings (embedded '\0's).
 637          */
 638         if (is_printable_string(data, len)) {
 639                 puts("\"");
 640                 j = 0;
 641                 while (j < len) {
 642                         if (j > 0)
 643                                 puts("\", \"");
 644                         puts(data);
 645                         j    += strlen(data) + 1;
 646                         data += strlen(data) + 1;
 647                 }
 648                 puts("\"");
 649                 return;
 650         }
 651
 652         if ((len %4) == 0) {
 653                 const u32 *p;
 654
 655                 printf("<");
 656                 for (j = 0, p = data; j < len/4; j ++)
 657                         printf("0x%x%s", p[j], j < (len/4 - 1) ? " " : "");
 658                 printf(">");
 659         } else { /* anything else... hexdump */
 660                 const u8 *s;
 661
 662                 printf("[");
 663                 for (j = 0, s = data; j < len; j++)
 664                         printf("%02x%s", s[j], j < len - 1 ? " " : "");
 665                 printf("]");
 666         }
 667 }
 668
 669 /****************************************************************************/
 670
 671 /*
 672  * Recursively print (a portion of) the working_fdt.  The depth parameter
 673  * determines how deeply nested the fdt is printed.
 674  */
 675 static int fdt_print(const char *pathp, char *prop, int depth)
 676 {
 677         static char tabs[MAX_LEVEL+1] =
 678                 "\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t"
 679                 "\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t";
 680         const void *nodep;      /* property node pointer */
 681         int  nodeoffset;        /* node offset from libfdt */
 682         int  nextoffset;        /* next node offset from libfdt */
 683         uint32_t tag;           /* tag */
 684         int  len;               /* length of the property */
 685         int  level = 0;         /* keep track of nesting level */
 686         const struct fdt_property *fdt_prop;
 687
 688         nodeoffset = fdt_path_offset (working_fdt, pathp);
 689         if (nodeoffset < 0) {
 690                 /*
 691                  * Not found or something else bad happened.
 692                  */
 693                 printf ("libfdt fdt_path_offset() returned %s\n",
 694                         fdt_strerror(nodeoffset));
 695                 return 1;
 696         }
 697         /*
 698          * The user passed in a property as well as node path.
 699          * Print only the given property and then return.
 700          */
 701         if (prop) {
 702                 nodep = fdt_getprop (working_fdt, nodeoffset, prop, &len);
 703                 if (len == 0) {
 704                         /* no property value */
 705                         printf("%s %s\n", pathp, prop);
 706                         return 0;
 707                 } else if (len > 0) {
 708                         printf("%s = ", prop);
 709                         print_data (nodep, len);
 710                         printf("\n");
 711                         return 0;
 712                 } else {
 713                         printf ("libfdt fdt_getprop(): %s\n",
 714                                 fdt_strerror(len));
 715                         return 1;
 716                 }
 717         }
 718
 719         /*
 720          * The user passed in a node path and no property,
 721          * print the node and all subnodes.
 722          */
 723         while(level >= 0) {
 724                 tag = fdt_next_tag(working_fdt, nodeoffset, &nextoffset);
 725                 switch(tag) {
 726                 case FDT_BEGIN_NODE:
 727                         pathp = fdt_get_name(working_fdt, nodeoffset, NULL);
 728                         if (level <= depth) {
 729                                 if (pathp == NULL)
 730                                         pathp = "/* NULL pointer error */";
 731                                 if (*pathp == '\0')
 732                                         pathp = "/";    /* root is nameless */
 733                                 printf("%s%s {\n",
 734                                         &tabs[MAX_LEVEL - level], pathp);
 735                         }
 736                         level++;
 737                         if (level >= MAX_LEVEL) {
 738                                 printf("Nested too deep, aborting.\n");
 739                                 return 1;
 740                         }
 741                         break;
 742                 case FDT_END_NODE:
 743                         level--;
 744                         if (level <= depth)
 745                                 printf("%s};\n", &tabs[MAX_LEVEL - level]);
 746                         if (level == 0) {
 747                                 level = -1;             /* exit the loop */
 748                         }
 749                         break;
 750                 case FDT_PROP:
 751                         fdt_prop = fdt_offset_ptr(working_fdt, nodeoffset,
 752                                         sizeof(*fdt_prop));
 753                         pathp    = fdt_string(working_fdt,
 754                                         fdt32_to_cpu(fdt_prop->nameoff));
 755                         len      = fdt32_to_cpu(fdt_prop->len);
 756                         nodep    = fdt_prop->data;
 757                         if (len < 0) {
 758                                 printf ("libfdt fdt_getprop(): %s\n",
 759                                         fdt_strerror(len));
 760                                 return 1;
 761                         } else if (len == 0) {
 762                                 /* the property has no value */
 763                                 if (level <= depth)
 764                                         printf("%s%s;\n",
 765                                                 &tabs[MAX_LEVEL - level],
 766                                                 pathp);
 767                         } else {
 768                                 if (level <= depth) {
 769                                         printf("%s%s = ",
 770                                                 &tabs[MAX_LEVEL - level],
 771                                                 pathp);
 772                                         print_data (nodep, len);
 773                                         printf(";\n");
 774                                 }
 775                         }
 776                         break;
 777                 case FDT_NOP:
 778                         printf("%s/* NOP */\n", &tabs[MAX_LEVEL - level]);
 779                         break;
 780                 case FDT_END:
 781                         return 1;
 782                 default:
 783                         if (level <= depth)
 784                                 printf("Unknown tag 0x%08X\n", tag);
 785                         return 1;
 786                 }
 787                 nodeoffset = nextoffset;
 788         }
 789         return 0;
 790 }
 791
 792 /********************************************************************/
 793
 794 U_BOOT_CMD(
 795         fdt,    255,    0,      do_fdt,
 796         "fdt     - flattened device tree utility commands\n",
 797             "addr   <addr> [<length>]        - Set the fdt location to <addr>\n"
 798 #ifdef CONFIG_OF_BOARD_SETUP
 799         "fdt boardsetup                      - Do board-specific set up\n"
 800 #endif
 801         "fdt move   <fdt> <newaddr> <length> - Copy the fdt to <addr> and make it active\n"
 802         "fdt print  <path> [<prop>]          - Recursive print starting at <path>\n"
 803         "fdt list   <path> [<prop>]          - Print one level starting at <path>\n"
 804         "fdt set    <path> <prop> [<val>]    - Set <property> [to <val>]\n"
 805         "fdt mknode <path> <node>            - Create a new node after <path>\n"
 806         "fdt rm     <path> [<prop>]          - Delete the node or <property>\n"
 807         "fdt header                          - Display header info\n"
 808         "fdt bootcpu <id>                    - Set boot cpuid\n"
 809         "fdt memory <addr> <size>            - Add/Update memory node\n"
 810         "fdt rsvmem print                    - Show current mem reserves\n"
 811         "fdt rsvmem add <addr> <size>        - Add a mem reserve\n"
 812         "fdt rsvmem delete <index>           - Delete a mem reserves\n"
 813         "fdt chosen [<start> <end>]          - Add/update the /chosen branch in the tree\n"
 814         "                                        <start>/<end> - initrd start/end addr\n"
 815         "NOTE: If the path or property you are setting/printing has a '#' character\n"
 816         "     or spaces, you MUST escape it with a \\ character or quote it with \".\n"
 817 );