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 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 *argv[])
  67 {
  68         if (argc < 2) {
  69                 cmd_usage(cmdtp);
  70                 return 1;
  71         }
  72
  73         /********************************************************************
  74          * Set the address of the fdt
  75          ********************************************************************/
  76         if (argv[1][0] == 'a') {
  77                 unsigned long addr;
  78                 /*
  79                  * Set the address [and length] of the fdt.
  80                  */
  81                 if (argc == 2) {
  82                         if (!fdt_valid()) {
  83                                 return 1;
  84                         }
  85                         printf("The address of the fdt is %p\n", working_fdt);
  86                         return 0;
  87                 }
  88
  89                 addr = simple_strtoul(argv[2], NULL, 16);
  90                 set_working_fdt_addr((void *)addr);
  91
  92                 if (!fdt_valid()) {
  93                         return 1;
  94                 }
  95
  96                 if (argc >= 4) {
  97                         int  len;
  98                         int  err;
  99                         /*
 100                          * Optional new length
 101                          */
 102                         len = simple_strtoul(argv[3], NULL, 16);
 103                         if (len < fdt_totalsize(working_fdt)) {
 104                                 printf ("New length %d < existing length %d, "
 105                                         "ignoring.\n",
 106                                         len, fdt_totalsize(working_fdt));
 107                         } else {
 108                                 /*
 109                                  * Open in place with a new length.
 110                                  */
 111                                 err = fdt_open_into(working_fdt, working_fdt, len);
 112                                 if (err != 0) {
 113                                         printf ("libfdt fdt_open_into(): %s\n",
 114                                                 fdt_strerror(err));
 115                                 }
 116                         }
 117                 }
 118
 119         /********************************************************************
 120          * Move the working_fdt
 121          ********************************************************************/
 122         } else if (strncmp(argv[1], "mo", 2) == 0) {
 123                 struct fdt_header *newaddr;
 124                 int  len;
 125                 int  err;
 126
 127                 if (argc < 4) {
 128                         cmd_usage(cmdtp);
 129                         return 1;
 130                 }
 131
 132                 /*
 133                  * Set the address and length of the fdt.
 134                  */
 135                 working_fdt = (struct fdt_header *)simple_strtoul(argv[2], NULL, 16);
 136                 if (!fdt_valid()) {
 137                         return 1;
 138                 }
 139
 140                 newaddr = (struct fdt_header *)simple_strtoul(argv[3],NULL,16);
 141
 142                 /*
 143                  * If the user specifies a length, use that.  Otherwise use the
 144                  * current length.
 145                  */
 146                 if (argc <= 4) {
 147                         len = fdt_totalsize(working_fdt);
 148                 } else {
 149                         len = simple_strtoul(argv[4], NULL, 16);
 150                         if (len < fdt_totalsize(working_fdt)) {
 151                                 printf ("New length 0x%X < existing length "
 152                                         "0x%X, aborting.\n",
 153                                         len, fdt_totalsize(working_fdt));
 154                                 return 1;
 155                         }
 156                 }
 157
 158                 /*
 159                  * Copy to the new location.
 160                  */
 161                 err = fdt_open_into(working_fdt, newaddr, len);
 162                 if (err != 0) {
 163                         printf ("libfdt fdt_open_into(): %s\n",
 164                                 fdt_strerror(err));
 165                         return 1;
 166                 }
 167                 working_fdt = newaddr;
 168
 169         /********************************************************************
 170          * Make a new node
 171          ********************************************************************/
 172         } else if (strncmp(argv[1], "mk", 2) == 0) {
 173                 char *pathp;            /* path */
 174                 char *nodep;            /* new node to add */
 175                 int  nodeoffset;        /* node offset from libfdt */
 176                 int  err;
 177
 178                 /*
 179                  * Parameters: Node path, new node to be appended to the path.
 180                  */
 181                 if (argc < 4) {
 182                         cmd_usage(cmdtp);
 183                         return 1;
 184                 }
 185
 186                 pathp = argv[2];
 187                 nodep = argv[3];
 188
 189                 nodeoffset = fdt_path_offset (working_fdt, pathp);
 190                 if (nodeoffset < 0) {
 191                         /*
 192                          * Not found or something else bad happened.
 193                          */
 194                         printf ("libfdt fdt_path_offset() returned %s\n",
 195                                 fdt_strerror(nodeoffset));
 196                         return 1;
 197                 }
 198                 err = fdt_add_subnode(working_fdt, nodeoffset, nodep);
 199                 if (err < 0) {
 200                         printf ("libfdt fdt_add_subnode(): %s\n",
 201                                 fdt_strerror(err));
 202                         return 1;
 203                 }
 204
 205         /********************************************************************
 206          * Set the value of a property in the working_fdt.
 207          ********************************************************************/
 208         } else if (argv[1][0] == 's') {
 209                 char *pathp;            /* path */
 210                 char *prop;             /* property */
 211                 int  nodeoffset;        /* node offset from libfdt */
 212                 static char data[SCRATCHPAD];   /* storage for the property */
 213                 int  len;               /* new length of the property */
 214                 int  ret;               /* return value */
 215
 216                 /*
 217                  * Parameters: Node path, property, optional value.
 218                  */
 219                 if (argc < 4) {
 220                         cmd_usage(cmdtp);
 221                         return 1;
 222                 }
 223
 224                 pathp  = argv[2];
 225                 prop   = argv[3];
 226                 if (argc == 4) {
 227                         len = 0;
 228                 } else {
 229                         ret = fdt_parse_prop(&argv[4], argc - 4, data, &len);
 230                         if (ret != 0)
 231                                 return ret;
 232                 }
 233
 234                 nodeoffset = fdt_path_offset (working_fdt, pathp);
 235                 if (nodeoffset < 0) {
 236                         /*
 237                          * Not found or something else bad happened.
 238                          */
 239                         printf ("libfdt fdt_path_offset() returned %s\n",
 240                                 fdt_strerror(nodeoffset));
 241                         return 1;
 242                 }
 243
 244                 ret = fdt_setprop(working_fdt, nodeoffset, prop, data, len);
 245                 if (ret < 0) {
 246                         printf ("libfdt fdt_setprop(): %s\n", fdt_strerror(ret));
 247                         return 1;
 248                 }
 249
 250         /********************************************************************
 251          * Print (recursive) / List (single level)
 252          ********************************************************************/
 253         } else if ((argv[1][0] == 'p') || (argv[1][0] == 'l')) {
 254                 int depth = MAX_LEVEL;  /* how deep to print */
 255                 char *pathp;            /* path */
 256                 char *prop;             /* property */
 257                 int  ret;               /* return value */
 258                 static char root[2] = "/";
 259
 260                 /*
 261                  * list is an alias for print, but limited to 1 level
 262                  */
 263                 if (argv[1][0] == 'l') {
 264                         depth = 1;
 265                 }
 266
 267                 /*
 268                  * Get the starting path.  The root node is an oddball,
 269                  * the offset is zero and has no name.
 270                  */
 271                 if (argc == 2)
 272                         pathp = root;
 273                 else
 274                         pathp = argv[2];
 275                 if (argc > 3)
 276                         prop = argv[3];
 277                 else
 278                         prop = NULL;
 279
 280                 ret = fdt_print(pathp, prop, depth);
 281                 if (ret != 0)
 282                         return ret;
 283
 284         /********************************************************************
 285          * Remove a property/node
 286          ********************************************************************/
 287         } else if (strncmp(argv[1], "rm", 2) == 0) {
 288                 int  nodeoffset;        /* node offset from libfdt */
 289                 int  err;
 290
 291                 /*
 292                  * Get the path.  The root node is an oddball, the offset
 293                  * is zero and has no name.
 294                  */
 295                 nodeoffset = fdt_path_offset (working_fdt, argv[2]);
 296                 if (nodeoffset < 0) {
 297                         /*
 298                          * Not found or something else bad happened.
 299                          */
 300                         printf ("libfdt fdt_path_offset() returned %s\n",
 301                                 fdt_strerror(nodeoffset));
 302                         return 1;
 303                 }
 304                 /*
 305                  * Do the delete.  A fourth parameter means delete a property,
 306                  * otherwise delete the node.
 307                  */
 308                 if (argc > 3) {
 309                         err = fdt_delprop(working_fdt, nodeoffset, argv[3]);
 310                         if (err < 0) {
 311                                 printf("libfdt fdt_delprop():  %s\n",
 312                                         fdt_strerror(err));
 313                                 return err;
 314                         }
 315                 } else {
 316                         err = fdt_del_node(working_fdt, nodeoffset);
 317                         if (err < 0) {
 318                                 printf("libfdt fdt_del_node():  %s\n",
 319                                         fdt_strerror(err));
 320                                 return err;
 321                         }
 322                 }
 323
 324         /********************************************************************
 325          * Display header info
 326          ********************************************************************/
 327         } else if (argv[1][0] == 'h') {
 328                 u32 version = fdt_version(working_fdt);
 329                 printf("magic:\t\t\t0x%x\n", fdt_magic(working_fdt));
 330                 printf("totalsize:\t\t0x%x (%d)\n", fdt_totalsize(working_fdt),
 331                        fdt_totalsize(working_fdt));
 332                 printf("off_dt_struct:\t\t0x%x\n",
 333                        fdt_off_dt_struct(working_fdt));
 334                 printf("off_dt_strings:\t\t0x%x\n",
 335                        fdt_off_dt_strings(working_fdt));
 336                 printf("off_mem_rsvmap:\t\t0x%x\n",
 337                        fdt_off_mem_rsvmap(working_fdt));
 338                 printf("version:\t\t%d\n", version);
 339                 printf("last_comp_version:\t%d\n",
 340                        fdt_last_comp_version(working_fdt));
 341                 if (version >= 2)
 342                         printf("boot_cpuid_phys:\t0x%x\n",
 343                                 fdt_boot_cpuid_phys(working_fdt));
 344                 if (version >= 3)
 345                         printf("size_dt_strings:\t0x%x\n",
 346                                 fdt_size_dt_strings(working_fdt));
 347                 if (version >= 17)
 348                         printf("size_dt_struct:\t\t0x%x\n",
 349                                 fdt_size_dt_struct(working_fdt));
 350                 printf("number mem_rsv:\t\t0x%x\n",
 351                        fdt_num_mem_rsv(working_fdt));
 352                 printf("\n");
 353
 354         /********************************************************************
 355          * Set boot cpu id
 356          ********************************************************************/
 357         } else if (strncmp(argv[1], "boo", 3) == 0) {
 358                 unsigned long tmp = simple_strtoul(argv[2], NULL, 16);
 359                 fdt_set_boot_cpuid_phys(working_fdt, tmp);
 360
 361         /********************************************************************
 362          * memory command
 363          ********************************************************************/
 364         } else if (strncmp(argv[1], "me", 2) == 0) {
 365                 uint64_t addr, size;
 366                 int err;
 367                 addr = simple_strtoull(argv[2], NULL, 16);
 368                 size = simple_strtoull(argv[3], NULL, 16);
 369                 err = fdt_fixup_memory(working_fdt, addr, size);
 370                 if (err < 0)
 371                         return err;
 372
 373         /********************************************************************
 374          * mem reserve commands
 375          ********************************************************************/
 376         } else if (strncmp(argv[1], "rs", 2) == 0) {
 377                 if (argv[2][0] == 'p') {
 378                         uint64_t addr, size;
 379                         int total = fdt_num_mem_rsv(working_fdt);
 380                         int j, err;
 381                         printf("index\t\t   start\t\t    size\n");
 382                         printf("-------------------------------"
 383                                 "-----------------\n");
 384                         for (j = 0; j < total; j++) {
 385                                 err = fdt_get_mem_rsv(working_fdt, j, &addr, &size);
 386                                 if (err < 0) {
 387                                         printf("libfdt fdt_get_mem_rsv():  %s\n",
 388                                                         fdt_strerror(err));
 389                                         return err;
 390                                 }
 391                                 printf("    %x\t%08x%08x\t%08x%08x\n", j,
 392                                         (u32)(addr >> 32),
 393                                         (u32)(addr & 0xffffffff),
 394                                         (u32)(size >> 32),
 395                                         (u32)(size & 0xffffffff));
 396                         }
 397                 } else if (argv[2][0] == 'a') {
 398                         uint64_t addr, size;
 399                         int err;
 400                         addr = simple_strtoull(argv[3], NULL, 16);
 401                         size = simple_strtoull(argv[4], NULL, 16);
 402                         err = fdt_add_mem_rsv(working_fdt, addr, size);
 403
 404                         if (err < 0) {
 405                                 printf("libfdt fdt_add_mem_rsv():  %s\n",
 406                                         fdt_strerror(err));
 407                                 return err;
 408                         }
 409                 } else if (argv[2][0] == 'd') {
 410                         unsigned long idx = simple_strtoul(argv[3], NULL, 16);
 411                         int err = fdt_del_mem_rsv(working_fdt, idx);
 412
 413                         if (err < 0) {
 414                                 printf("libfdt fdt_del_mem_rsv():  %s\n",
 415                                         fdt_strerror(err));
 416                                 return err;
 417                         }
 418                 } else {
 419                         /* Unrecognized command */
 420                         cmd_usage(cmdtp);
 421                         return 1;
 422                 }
 423         }
 424 #ifdef CONFIG_OF_BOARD_SETUP
 425         /* Call the board-specific fixup routine */
 426         else if (strncmp(argv[1], "boa", 3) == 0)
 427                 ft_board_setup(working_fdt, gd->bd);
 428 #endif
 429         /* Create a chosen node */
 430         else if (argv[1][0] == 'c') {
 431                 unsigned long initrd_start = 0, initrd_end = 0;
 432
 433                 if ((argc != 2) && (argc != 4)) {
 434                         cmd_usage(cmdtp);
 435                         return 1;
 436                 }
 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                 cmd_usage(cmdtp);
 453                 return 1;
 454         }
 455
 456         return 0;
 457 }
 458
 459 /****************************************************************************/
 460
 461 static int fdt_valid(void)
 462 {
 463         int  err;
 464
 465         if (working_fdt == NULL) {
 466                 printf ("The address of the fdt is invalid (NULL).\n");
 467                 return 0;
 468         }
 469
 470         err = fdt_check_header(working_fdt);
 471         if (err == 0)
 472                 return 1;       /* valid */
 473
 474         if (err < 0) {
 475                 printf("libfdt fdt_check_header(): %s", fdt_strerror(err));
 476                 /*
 477                  * Be more informative on bad version.
 478                  */
 479                 if (err == -FDT_ERR_BADVERSION) {
 480                         if (fdt_version(working_fdt) <
 481                             FDT_FIRST_SUPPORTED_VERSION) {
 482                                 printf (" - too old, fdt %d < %d",
 483                                         fdt_version(working_fdt),
 484                                         FDT_FIRST_SUPPORTED_VERSION);
 485                                 working_fdt = NULL;
 486                         }
 487                         if (fdt_last_comp_version(working_fdt) >
 488                             FDT_LAST_SUPPORTED_VERSION) {
 489                                 printf (" - too new, fdt %d > %d",
 490                                         fdt_version(working_fdt),
 491                                         FDT_LAST_SUPPORTED_VERSION);
 492                                 working_fdt = NULL;
 493                         }
 494                         return 0;
 495                 }
 496                 printf("\n");
 497                 return 0;
 498         }
 499         return 1;
 500 }
 501
 502 /****************************************************************************/
 503
 504 /*
 505  * Parse the user's input, partially heuristic.  Valid formats:
 506  * <0x00112233 4 05>    - an array of cells.  Numbers follow standard
 507  *                      C conventions.
 508  * [00 11 22 .. nn] - byte stream
 509  * "string"     - If the the value doesn't start with "<" or "[", it is
 510  *                      treated as a string.  Note that the quotes are
 511  *                      stripped by the parser before we get the string.
 512  * newval: An array of strings containing the new property as specified
 513  *      on the command line
 514  * count: The number of strings in the array
 515  * data: A bytestream to be placed in the property
 516  * len: The length of the resulting bytestream
 517  */
 518 static int fdt_parse_prop(char **newval, int count, char *data, int *len)
 519 {
 520         char *cp;               /* temporary char pointer */
 521         char *newp;             /* temporary newval char pointer */
 522         unsigned long tmp;      /* holds converted values */
 523         int stridx = 0;
 524
 525         *len = 0;
 526         newp = newval[0];
 527
 528         /* An array of cells */
 529         if (*newp == '<') {
 530                 newp++;
 531                 while ((*newp != '>') && (stridx < count)) {
 532                         /*
 533                          * Keep searching until we find that last ">"
 534                          * That way users don't have to escape the spaces
 535                          */
 536                         if (*newp == '\0') {
 537                                 newp = newval[++stridx];
 538                                 continue;
 539                         }
 540
 541                         cp = newp;
 542                         tmp = simple_strtoul(cp, &newp, 0);
 543                         *(uint32_t *)data = __cpu_to_be32(tmp);
 544                         data  += 4;
 545                         *len += 4;
 546
 547                         /* If the ptr didn't advance, something went wrong */
 548                         if ((newp - cp) <= 0) {
 549                                 printf("Sorry, I could not convert \"%s\"\n",
 550                                         cp);
 551                                 return 1;
 552                         }
 553
 554                         while (*newp == ' ')
 555                                 newp++;
 556                 }
 557
 558                 if (*newp != '>') {
 559                         printf("Unexpected character '%c'\n", *newp);
 560                         return 1;
 561                 }
 562         } else if (*newp == '[') {
 563                 /*
 564                  * Byte stream.  Convert the values.
 565                  */
 566                 newp++;
 567                 while ((stridx < count) && (*newp != ']')) {
 568                         while (*newp == ' ')
 569                                 newp++;
 570                         if (*newp == '\0') {
 571                                 newp = newval[++stridx];
 572                                 continue;
 573                         }
 574                         if (!isxdigit(*newp))
 575                                 break;
 576                         tmp = simple_strtoul(newp, &newp, 16);
 577                         *data++ = tmp & 0xFF;
 578                         *len    = *len + 1;
 579                 }
 580                 if (*newp != ']') {
 581                         printf("Unexpected character '%c'\n", *newp);
 582                         return 1;
 583                 }
 584         } else {
 585                 /*
 586                  * Assume it is one or more strings.  Copy it into our
 587                  * data area for convenience (including the
 588                  * terminating '\0's).
 589                  */
 590                 while (stridx < count) {
 591                         size_t length = strlen(newp) + 1;
 592                         strcpy(data, newp);
 593                         data += length;
 594                         *len += length;
 595                         newp = newval[++stridx];
 596                 }
 597         }
 598         return 0;
 599 }
 600
 601 /****************************************************************************/
 602
 603 /*
 604  * Heuristic to guess if this is a string or concatenated strings.
 605  */
 606
 607 static int is_printable_string(const void *data, int len)
 608 {
 609         const char *s = data;
 610
 611         /* zero length is not */
 612         if (len == 0)
 613                 return 0;
 614
 615         /* must terminate with zero */
 616         if (s[len - 1] != '\0')
 617                 return 0;
 618
 619         /* printable or a null byte (concatenated strings) */
 620         while (((*s == '\0') || isprint(*s)) && (len > 0)) {
 621                 /*
 622                  * If we see a null, there are three possibilities:
 623                  * 1) If len == 1, it is the end of the string, printable
 624                  * 2) Next character also a null, not printable.
 625                  * 3) Next character not a null, continue to check.
 626                  */
 627                 if (s[0] == '\0') {
 628                         if (len == 1)
 629                                 return 1;
 630                         if (s[1] == '\0')
 631                                 return 0;
 632                 }
 633                 s++;
 634                 len--;
 635         }
 636
 637         /* Not the null termination, or not done yet: not printable */
 638         if (*s != '\0' || (len != 0))
 639                 return 0;
 640
 641         return 1;
 642 }
 643
 644
 645 /*
 646  * Print the property in the best format, a heuristic guess.  Print as
 647  * a string, concatenated strings, a byte, word, double word, or (if all
 648  * else fails) it is printed as a stream of bytes.
 649  */
 650 static void print_data(const void *data, int len)
 651 {
 652         int j;
 653
 654         /* no data, don't print */
 655         if (len == 0)
 656                 return;
 657
 658         /*
 659          * It is a string, but it may have multiple strings (embedded '\0's).
 660          */
 661         if (is_printable_string(data, len)) {
 662                 puts("\"");
 663                 j = 0;
 664                 while (j < len) {
 665                         if (j > 0)
 666                                 puts("\", \"");
 667                         puts(data);
 668                         j    += strlen(data) + 1;
 669                         data += strlen(data) + 1;
 670                 }
 671                 puts("\"");
 672                 return;
 673         }
 674
 675         if ((len %4) == 0) {
 676                 const u32 *p;
 677
 678                 printf("<");
 679                 for (j = 0, p = data; j < len/4; j ++)
 680                         printf("0x%x%s", p[j], j < (len/4 - 1) ? " " : "");
 681                 printf(">");
 682         } else { /* anything else... hexdump */
 683                 const u8 *s;
 684
 685                 printf("[");
 686                 for (j = 0, s = data; j < len; j++)
 687                         printf("%02x%s", s[j], j < len - 1 ? " " : "");
 688                 printf("]");
 689         }
 690 }
 691
 692 /****************************************************************************/
 693
 694 /*
 695  * Recursively print (a portion of) the working_fdt.  The depth parameter
 696  * determines how deeply nested the fdt is printed.
 697  */
 698 static int fdt_print(const char *pathp, char *prop, int depth)
 699 {
 700         static char tabs[MAX_LEVEL+1] =
 701                 "\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t"
 702                 "\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t";
 703         const void *nodep;      /* property node pointer */
 704         int  nodeoffset;        /* node offset from libfdt */
 705         int  nextoffset;        /* next node offset from libfdt */
 706         uint32_t tag;           /* tag */
 707         int  len;               /* length of the property */
 708         int  level = 0;         /* keep track of nesting level */
 709         const struct fdt_property *fdt_prop;
 710
 711         nodeoffset = fdt_path_offset (working_fdt, pathp);
 712         if (nodeoffset < 0) {
 713                 /*
 714                  * Not found or something else bad happened.
 715                  */
 716                 printf ("libfdt fdt_path_offset() returned %s\n",
 717                         fdt_strerror(nodeoffset));
 718                 return 1;
 719         }
 720         /*
 721          * The user passed in a property as well as node path.
 722          * Print only the given property and then return.
 723          */
 724         if (prop) {
 725                 nodep = fdt_getprop (working_fdt, nodeoffset, prop, &len);
 726                 if (len == 0) {
 727                         /* no property value */
 728                         printf("%s %s\n", pathp, prop);
 729                         return 0;
 730                 } else if (len > 0) {
 731                         printf("%s = ", prop);
 732                         print_data (nodep, len);
 733                         printf("\n");
 734                         return 0;
 735                 } else {
 736                         printf ("libfdt fdt_getprop(): %s\n",
 737                                 fdt_strerror(len));
 738                         return 1;
 739                 }
 740         }
 741
 742         /*
 743          * The user passed in a node path and no property,
 744          * print the node and all subnodes.
 745          */
 746         while(level >= 0) {
 747                 tag = fdt_next_tag(working_fdt, nodeoffset, &nextoffset);
 748                 switch(tag) {
 749                 case FDT_BEGIN_NODE:
 750                         pathp = fdt_get_name(working_fdt, nodeoffset, NULL);
 751                         if (level <= depth) {
 752                                 if (pathp == NULL)
 753                                         pathp = "/* NULL pointer error */";
 754                                 if (*pathp == '\0')
 755                                         pathp = "/";    /* root is nameless */
 756                                 printf("%s%s {\n",
 757                                         &tabs[MAX_LEVEL - level], pathp);
 758                         }
 759                         level++;
 760                         if (level >= MAX_LEVEL) {
 761                                 printf("Nested too deep, aborting.\n");
 762                                 return 1;
 763                         }
 764                         break;
 765                 case FDT_END_NODE:
 766                         level--;
 767                         if (level <= depth)
 768                                 printf("%s};\n", &tabs[MAX_LEVEL - level]);
 769                         if (level == 0) {
 770                                 level = -1;             /* exit the loop */
 771                         }
 772                         break;
 773                 case FDT_PROP:
 774                         fdt_prop = fdt_offset_ptr(working_fdt, nodeoffset,
 775                                         sizeof(*fdt_prop));
 776                         pathp    = fdt_string(working_fdt,
 777                                         fdt32_to_cpu(fdt_prop->nameoff));
 778                         len      = fdt32_to_cpu(fdt_prop->len);
 779                         nodep    = fdt_prop->data;
 780                         if (len < 0) {
 781                                 printf ("libfdt fdt_getprop(): %s\n",
 782                                         fdt_strerror(len));
 783                                 return 1;
 784                         } else if (len == 0) {
 785                                 /* the property has no value */
 786                                 if (level <= depth)
 787                                         printf("%s%s;\n",
 788                                                 &tabs[MAX_LEVEL - level],
 789                                                 pathp);
 790                         } else {
 791                                 if (level <= depth) {
 792                                         printf("%s%s = ",
 793                                                 &tabs[MAX_LEVEL - level],
 794                                                 pathp);
 795                                         print_data (nodep, len);
 796                                         printf(";\n");
 797                                 }
 798                         }
 799                         break;
 800                 case FDT_NOP:
 801                         printf("%s/* NOP */\n", &tabs[MAX_LEVEL - level]);
 802                         break;
 803                 case FDT_END:
 804                         return 1;
 805                 default:
 806                         if (level <= depth)
 807                                 printf("Unknown tag 0x%08X\n", tag);
 808                         return 1;
 809                 }
 810                 nodeoffset = nextoffset;
 811         }
 812         return 0;
 813 }
 814
 815 /********************************************************************/
 816
 817 U_BOOT_CMD(
 818         fdt,    255,    0,      do_fdt,
 819         "flattened device tree utility commands",
 820             "addr   <addr> [<length>]        - Set the fdt location to <addr>\n"
 821 #ifdef CONFIG_OF_BOARD_SETUP
 822         "fdt boardsetup                      - Do board-specific set up\n"
 823 #endif
 824         "fdt move   <fdt> <newaddr> <length> - Copy the fdt to <addr> and make it active\n"
 825         "fdt resize                          - Resize fdt to size + padding to 4k addr\n"
 826         "fdt print  <path> [<prop>]          - Recursive print starting at <path>\n"
 827         "fdt list   <path> [<prop>]          - Print one level starting at <path>\n"
 828         "fdt set    <path> <prop> [<val>]    - Set <property> [to <val>]\n"
 829         "fdt mknode <path> <node>            - Create a new node after <path>\n"
 830         "fdt rm     <path> [<prop>]          - Delete the node or <property>\n"
 831         "fdt header                          - Display header info\n"
 832         "fdt bootcpu <id>                    - Set boot cpuid\n"
 833         "fdt memory <addr> <size>            - Add/Update memory node\n"
 834         "fdt rsvmem print                    - Show current mem reserves\n"
 835         "fdt rsvmem add <addr> <size>        - Add a mem reserve\n"
 836         "fdt rsvmem delete <index>           - Delete a mem reserves\n"
 837         "fdt chosen [<start> <end>]          - Add/update the /chosen branch in the tree\n"
 838         "                                        <start>/<end> - initrd start/end addr\n"
 839         "NOTE: Dereference aliases by omiting the leading '/', "
 840                 "e.g. fdt print ethernet0."
 841 );