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 *pathp, char *prop, char *newval,
  46         char *data, int *len);
  47 static int fdt_print(const char *pathp, char *prop, int depth);
  48
  49 /*
  50  * Flattened Device Tree command, see the help for parameter definitions.
  51  */
  52 int do_fdt (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
  53 {
  54         if (argc < 2) {
  55                 printf ("Usage:\n%s\n", cmdtp->usage);
  56                 return 1;
  57         }
  58
  59         /********************************************************************
  60          * Set the address of the fdt
  61          ********************************************************************/
  62         if (argv[1][0] == 'a') {
  63                 /*
  64                  * Set the address [and length] of the fdt.
  65                  */
  66                 fdt = (struct fdt_header *)simple_strtoul(argv[2], NULL, 16);
  67
  68                 if (!fdt_valid()) {
  69                         return 1;
  70                 }
  71
  72                 if (argc >= 4) {
  73                         int  len;
  74                         int  err;
  75                         /*
  76                          * Optional new length
  77                          */
  78                         len = simple_strtoul(argv[3], NULL, 16);
  79                         if (len < fdt_totalsize(fdt)) {
  80                                 printf ("New length %d < existing length %d, "
  81                                         "ignoring.\n",
  82                                         len, fdt_totalsize(fdt));
  83                         } else {
  84                                 /*
  85                                  * Open in place with a new length.
  86                                  */
  87                                 err = fdt_open_into(fdt, fdt, len);
  88                                 if (err != 0) {
  89                                         printf ("libfdt fdt_open_into(): %s\n",
  90                                                 fdt_strerror(err));
  91                                 }
  92                         }
  93                 }
  94
  95         /********************************************************************
  96          * Move the fdt
  97          ********************************************************************/
  98         } else if ((argv[1][0] == 'm') && (argv[1][1] == 'o')) {
  99                 struct fdt_header *newaddr;
 100                 int  len;
 101                 int  err;
 102
 103                 if (argc < 4) {
 104                         printf ("Usage:\n%s\n", cmdtp->usage);
 105                         return 1;
 106                 }
 107
 108                 /*
 109                  * Set the address and length of the fdt.
 110                  */
 111                 fdt = (struct fdt_header *)simple_strtoul(argv[2], NULL, 16);
 112                 if (!fdt_valid()) {
 113                         return 1;
 114                 }
 115
 116                 newaddr = (struct fdt_header *)simple_strtoul(argv[3],NULL,16);
 117
 118                 /*
 119                  * If the user specifies a length, use that.  Otherwise use the
 120                  * current length.
 121                  */
 122                 if (argc <= 4) {
 123                         len = fdt_totalsize(fdt);
 124                 } else {
 125                         len = simple_strtoul(argv[4], NULL, 16);
 126                         if (len < fdt_totalsize(fdt)) {
 127                                 printf ("New length 0x%X < existing length "
 128                                         "0x%X, aborting.\n",
 129                                         len, fdt_totalsize(fdt));
 130                                 return 1;
 131                         }
 132                 }
 133
 134                 /*
 135                  * Copy to the new location.
 136                  */
 137                 err = fdt_open_into(fdt, newaddr, len);
 138                 if (err != 0) {
 139                         printf ("libfdt fdt_open_into(): %s\n",
 140                                 fdt_strerror(err));
 141                         return 1;
 142                 }
 143                 fdt = newaddr;
 144
 145         /********************************************************************
 146          * Make a new node
 147          ********************************************************************/
 148         } else if ((argv[1][0] == 'm') && (argv[1][1] == 'k')) {
 149                 char *pathp;            /* path */
 150                 char *nodep;            /* new node to add */
 151                 int  nodeoffset;        /* node offset from libfdt */
 152                 int  err;
 153
 154                 /*
 155                  * Parameters: Node path, new node to be appended to the path.
 156                  */
 157                 if (argc < 4) {
 158                         printf ("Usage:\n%s\n", cmdtp->usage);
 159                         return 1;
 160                 }
 161
 162                 pathp = argv[2];
 163                 nodep = argv[3];
 164
 165                 nodeoffset = fdt_path_offset (fdt, pathp);
 166                 if (nodeoffset < 0) {
 167                         /*
 168                          * Not found or something else bad happened.
 169                          */
 170                         printf ("libfdt fdt_path_offset() returned %s\n",
 171                                 fdt_strerror(nodeoffset));
 172                         return 1;
 173                 }
 174                 err = fdt_add_subnode(fdt, nodeoffset, nodep);
 175                 if (err < 0) {
 176                         printf ("libfdt fdt_add_subnode(): %s\n",
 177                                 fdt_strerror(err));
 178                         return 1;
 179                 }
 180
 181         /********************************************************************
 182          * Set the value of a property in the fdt.
 183          ********************************************************************/
 184         } else if (argv[1][0] == 's') {
 185                 char *pathp;            /* path */
 186                 char *prop;             /* property */
 187                 int  nodeoffset;        /* node offset from libfdt */
 188                 static char data[SCRATCHPAD];   /* storage for the property */
 189                 int  len;               /* new length of the property */
 190                 int  ret;               /* return value */
 191
 192                 /*
 193                  * Parameters: Node path, property, optional value.
 194                  */
 195                 if (argc < 4) {
 196                         printf ("Usage:\n%s\n", cmdtp->usage);
 197                         return 1;
 198                 }
 199
 200                 pathp  = argv[2];
 201                 prop   = argv[3];
 202                 if (argc == 4) {
 203                         len = 0;
 204                 } else {
 205                         ret = fdt_parse_prop(pathp, prop, argv[4], data, &len);
 206                         if (ret != 0)
 207                                 return ret;
 208                 }
 209
 210                 nodeoffset = fdt_path_offset (fdt, pathp);
 211                 if (nodeoffset < 0) {
 212                         /*
 213                          * Not found or something else bad happened.
 214                          */
 215                         printf ("libfdt fdt_path_offset() returned %s\n",
 216                                 fdt_strerror(nodeoffset));
 217                         return 1;
 218                 }
 219
 220                 ret = fdt_setprop(fdt, nodeoffset, prop, data, len);
 221                 if (ret < 0) {
 222                         printf ("libfdt fdt_setprop(): %s\n", fdt_strerror(ret));
 223                         return 1;
 224                 }
 225
 226         /********************************************************************
 227          * Print (recursive) / List (single level)
 228          ********************************************************************/
 229         } else if ((argv[1][0] == 'p') || (argv[1][0] == 'l')) {
 230                 int depth = MAX_LEVEL;  /* how deep to print */
 231                 char *pathp;            /* path */
 232                 char *prop;             /* property */
 233                 int  ret;               /* return value */
 234                 static char root[2] = "/";
 235
 236                 /*
 237                  * list is an alias for print, but limited to 1 level
 238                  */
 239                 if (argv[1][0] == 'l') {
 240                         depth = 1;
 241                 }
 242
 243                 /*
 244                  * Get the starting path.  The root node is an oddball,
 245                  * the offset is zero and has no name.
 246                  */
 247                 if (argc == 2)
 248                         pathp = root;
 249                 else
 250                         pathp = argv[2];
 251                 if (argc > 3)
 252                         prop = argv[3];
 253                 else
 254                         prop = NULL;
 255
 256                 ret = fdt_print(pathp, prop, depth);
 257                 if (ret != 0)
 258                         return ret;
 259
 260         /********************************************************************
 261          * Remove a property/node
 262          ********************************************************************/
 263         } else if (argv[1][0] == 'r') {
 264                 int  nodeoffset;        /* node offset from libfdt */
 265                 int  err;
 266
 267                 /*
 268                  * Get the path.  The root node is an oddball, the offset
 269                  * is zero and has no name.
 270                  */
 271                 nodeoffset = fdt_path_offset (fdt, argv[2]);
 272                 if (nodeoffset < 0) {
 273                         /*
 274                          * Not found or something else bad happened.
 275                          */
 276                         printf ("libfdt fdt_path_offset() returned %s\n",
 277                                 fdt_strerror(nodeoffset));
 278                         return 1;
 279                 }
 280                 /*
 281                  * Do the delete.  A fourth parameter means delete a property,
 282                  * otherwise delete the node.
 283                  */
 284                 if (argc > 3) {
 285                         err = fdt_delprop(fdt, nodeoffset, argv[3]);
 286                         if (err < 0) {
 287                                 printf("libfdt fdt_delprop():  %s\n",
 288                                         fdt_strerror(err));
 289                                 return err;
 290                         }
 291                 } else {
 292                         err = fdt_del_node(fdt, nodeoffset);
 293                         if (err < 0) {
 294                                 printf("libfdt fdt_del_node():  %s\n",
 295                                         fdt_strerror(err));
 296                                 return err;
 297                         }
 298                 }
 299         }
 300 #ifdef CONFIG_OF_BOARD_SETUP
 301         /* Call the board-specific fixup routine */
 302         else if (argv[1][0] == 'b')
 303                 ft_board_setup(fdt, gd->bd);
 304 #endif
 305         /* Create a chosen node */
 306         else if (argv[1][0] == 'c')
 307                 fdt_chosen(fdt, 0, 0, 1);
 308
 309 #ifdef CONFIG_OF_HAS_UBOOT_ENV
 310         /* Create a u-boot-env node */
 311         else if (argv[1][0] == 'e')
 312                 fdt_env(fdt);
 313 #endif
 314 #ifdef CONFIG_OF_HAS_BD_T
 315         /* Create a bd_t node */
 316         else if (argv[1][0] == 'b')
 317                 fdt_bd_t(fdt);
 318 #endif
 319         else {
 320                 /* Unrecognized command */
 321                 printf ("Usage:\n%s\n", cmdtp->usage);
 322                 return 1;
 323         }
 324
 325         return 0;
 326 }
 327
 328 /****************************************************************************/
 329
 330 static int fdt_valid(void)
 331 {
 332         int  err;
 333
 334         if (fdt == NULL) {
 335                 printf ("The address of the fdt is invalid (NULL).\n");
 336                 return 0;
 337         }
 338
 339         err = fdt_check_header(fdt);
 340         if (err == 0)
 341                 return 1;       /* valid */
 342
 343         if (err < 0) {
 344                 printf("libfdt fdt_check_header(): %s", fdt_strerror(err));
 345                 /*
 346                  * Be more informative on bad version.
 347                  */
 348                 if (err == -FDT_ERR_BADVERSION) {
 349                         if (fdt_version(fdt) < FDT_FIRST_SUPPORTED_VERSION) {
 350                                 printf (" - too old, fdt $d < %d",
 351                                         fdt_version(fdt),
 352                                         FDT_FIRST_SUPPORTED_VERSION);
 353                                 fdt = NULL;
 354                         }
 355                         if (fdt_last_comp_version(fdt) > FDT_LAST_SUPPORTED_VERSION) {
 356                                 printf (" - too new, fdt $d > %d",
 357                                         fdt_version(fdt),
 358                                         FDT_LAST_SUPPORTED_VERSION);
 359                                 fdt = NULL;
 360                         }
 361                         return 0;
 362                 }
 363                 printf("\n");
 364                 return 0;
 365         }
 366         return 1;
 367 }
 368
 369 /****************************************************************************/
 370
 371 /*
 372  * Parse the user's input, partially heuristic.  Valid formats:
 373  * <00>         - hex byte
 374  * <0011>       - hex half word (16 bits)
 375  * <00112233>   - hex word (32 bits)
 376  *              - hex double words (64 bits) are not supported, must use
 377  *                      a byte stream instead.
 378  * [00 11 22 .. nn] - byte stream
 379  * "string"     - If the the value doesn't start with "<" or "[", it is
 380  *                      treated as a string.  Note that the quotes are
 381  *                      stripped by the parser before we get the string.
 382  */
 383 static int fdt_parse_prop(char *pathp, char *prop, char *newval,
 384         char *data, int *len)
 385 {
 386         char *cp;               /* temporary char pointer */
 387         unsigned long tmp;      /* holds converted values */
 388
 389         if (*newval == '<') {
 390                 /*
 391                  * Bigger values than bytes.
 392                  */
 393                 *len = 0;
 394                 newval++;
 395                 while ((*newval != '>') && (*newval != '\0')) {
 396                         cp = newval;
 397                         tmp = simple_strtoul(cp, &newval, 16);
 398                         if ((newval - cp) <= 2) {
 399                                 *data = tmp & 0xFF;
 400                                 data  += 1;
 401                                 *len += 1;
 402                         } else if ((newval - cp) <= 4) {
 403                                 *(uint16_t *)data = __cpu_to_be16(tmp);
 404                                 data  += 2;
 405                                 *len += 2;
 406                         } else if ((newval - cp) <= 8) {
 407                                 *(uint32_t *)data = __cpu_to_be32(tmp);
 408                                 data  += 4;
 409                                 *len += 4;
 410                         } else {
 411                                 printf("Sorry, I could not convert \"%s\"\n",
 412                                         cp);
 413                                 return 1;
 414                         }
 415                         while (*newval == ' ')
 416                                 newval++;
 417                 }
 418                 if (*newval != '>') {
 419                         printf("Unexpected character '%c'\n", *newval);
 420                         return 1;
 421                 }
 422         } else if (*newval == '[') {
 423                 /*
 424                  * Byte stream.  Convert the values.
 425                  */
 426                 *len = 0;
 427                 newval++;
 428                 while ((*newval != ']') && (*newval != '\0')) {
 429                         tmp = simple_strtoul(newval, &newval, 16);
 430                         *data++ = tmp & 0xFF;
 431                         *len    = *len + 1;
 432                         while (*newval == ' ')
 433                                 newval++;
 434                 }
 435                 if (*newval != ']') {
 436                         printf("Unexpected character '%c'\n", *newval);
 437                         return 1;
 438                 }
 439         } else {
 440                 /*
 441                  * Assume it is a string.  Copy it into our data area for
 442                  * convenience (including the terminating '\0').
 443                  */
 444                 *len = strlen(newval) + 1;
 445                 strcpy(data, newval);
 446         }
 447         return 0;
 448 }
 449
 450 /****************************************************************************/
 451
 452 /*
 453  * Heuristic to guess if this is a string or concatenated strings.
 454  */
 455
 456 static int is_printable_string(const void *data, int len)
 457 {
 458         const char *s = data;
 459
 460         /* zero length is not */
 461         if (len == 0)
 462                 return 0;
 463
 464         /* must terminate with zero */
 465         if (s[len - 1] != '\0')
 466                 return 0;
 467
 468         /* printable or a null byte (concatenated strings) */
 469         while (((*s == '\0') || isprint(*s)) && (len > 0)) {
 470                 /*
 471                  * If we see a null, there are three possibilities:
 472                  * 1) If len == 1, it is the end of the string, printable
 473                  * 2) Next character also a null, not printable.
 474                  * 3) Next character not a null, continue to check.
 475                  */
 476                 if (s[0] == '\0') {
 477                         if (len == 1)
 478                                 return 1;
 479                         if (s[1] == '\0')
 480                                 return 0;
 481                 }
 482                 s++;
 483                 len--;
 484         }
 485
 486         /* Not the null termination, or not done yet: not printable */
 487         if (*s != '\0' || (len != 0))
 488                 return 0;
 489
 490         return 1;
 491 }
 492
 493
 494 /*
 495  * Print the property in the best format, a heuristic guess.  Print as
 496  * a string, concatenated strings, a byte, word, double word, or (if all
 497  * else fails) it is printed as a stream of bytes.
 498  */
 499 static void print_data(const void *data, int len)
 500 {
 501         int j;
 502         const u8 *s;
 503
 504         /* no data, don't print */
 505         if (len == 0)
 506                 return;
 507
 508         /*
 509          * It is a string, but it may have multiple strings (embedded '\0's).
 510          */
 511         if (is_printable_string(data, len)) {
 512                 puts("\"");
 513                 j = 0;
 514                 while (j < len) {
 515                         if (j > 0)
 516                                 puts("\", \"");
 517                         puts(data);
 518                         j    += strlen(data) + 1;
 519                         data += strlen(data) + 1;
 520                 }
 521                 puts("\"");
 522                 return;
 523         }
 524
 525         switch (len) {
 526         case 1:  /* byte */
 527                 printf("<0x%02x>", (*(u8 *) data) & 0xff);
 528                 break;
 529         case 2:  /* half-word */
 530                 printf("<0x%04x>", be16_to_cpu(*(u16 *) data) & 0xffff);
 531                 break;
 532         case 4:  /* word */
 533                 printf("<0x%08x>", be32_to_cpu(*(u32 *) data) & 0xffffffffU);
 534                 break;
 535         case 8:  /* double-word */
 536 #if __WORDSIZE == 64
 537                 printf("<0x%016llx>", be64_to_cpu(*(uint64_t *) data));
 538 #else
 539                 printf("<0x%08x ", be32_to_cpu(*(u32 *) data) & 0xffffffffU);
 540                 data += 4;
 541                 printf("0x%08x>", be32_to_cpu(*(u32 *) data) & 0xffffffffU);
 542 #endif
 543                 break;
 544         default:                /* anything else... hexdump */
 545                 printf("[");
 546                 for (j = 0, s = data; j < len; j++)
 547                         printf("%02x%s", s[j], j < len - 1 ? " " : "");
 548                 printf("]");
 549
 550                 break;
 551         }
 552 }
 553
 554 /****************************************************************************/
 555
 556 /*
 557  * Recursively print (a portion of) the fdt.  The depth parameter
 558  * determines how deeply nested the fdt is printed.
 559  */
 560 static int fdt_print(const char *pathp, char *prop, int depth)
 561 {
 562         static char tabs[MAX_LEVEL+1] =
 563                 "\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t"
 564                 "\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t";
 565         const void *nodep;      /* property node pointer */
 566         int  nodeoffset;        /* node offset from libfdt */
 567         int  nextoffset;        /* next node offset from libfdt */
 568         uint32_t tag;           /* tag */
 569         int  len;               /* length of the property */
 570         int  level = 0;         /* keep track of nesting level */
 571         const struct fdt_property *fdt_prop;
 572
 573         nodeoffset = fdt_path_offset (fdt, pathp);
 574         if (nodeoffset < 0) {
 575                 /*
 576                  * Not found or something else bad happened.
 577                  */
 578                 printf ("libfdt fdt_path_offset() returned %s\n",
 579                         fdt_strerror(nodeoffset));
 580                 return 1;
 581         }
 582         /*
 583          * The user passed in a property as well as node path.
 584          * Print only the given property and then return.
 585          */
 586         if (prop) {
 587                 nodep = fdt_getprop (fdt, nodeoffset, prop, &len);
 588                 if (len == 0) {
 589                         /* no property value */
 590                         printf("%s %s\n", pathp, prop);
 591                         return 0;
 592                 } else if (len > 0) {
 593                         printf("%s = ", prop);
 594                         print_data (nodep, len);
 595                         printf("\n");
 596                         return 0;
 597                 } else {
 598                         printf ("libfdt fdt_getprop(): %s\n",
 599                                 fdt_strerror(len));
 600                         return 1;
 601                 }
 602         }
 603
 604         /*
 605          * The user passed in a node path and no property,
 606          * print the node and all subnodes.
 607          */
 608         while(level >= 0) {
 609                 tag = fdt_next_tag(fdt, nodeoffset, &nextoffset);
 610                 switch(tag) {
 611                 case FDT_BEGIN_NODE:
 612                         pathp = fdt_get_name(fdt, nodeoffset, NULL);
 613                         if (level <= depth) {
 614                                 if (pathp == NULL)
 615                                         pathp = "/* NULL pointer error */";
 616                                 if (*pathp == '\0')
 617                                         pathp = "/";    /* root is nameless */
 618                                 printf("%s%s {\n",
 619                                         &tabs[MAX_LEVEL - level], pathp);
 620                         }
 621                         level++;
 622                         if (level >= MAX_LEVEL) {
 623                                 printf("Nested too deep, aborting.\n");
 624                                 return 1;
 625                         }
 626                         break;
 627                 case FDT_END_NODE:
 628                         level--;
 629                         if (level <= depth)
 630                                 printf("%s};\n", &tabs[MAX_LEVEL - level]);
 631                         if (level == 0) {
 632                                 level = -1;             /* exit the loop */
 633                         }
 634                         break;
 635                 case FDT_PROP:
 636                         fdt_prop = fdt_offset_ptr(fdt, nodeoffset,
 637                                         sizeof(*fdt_prop));
 638                         pathp    = fdt_string(fdt,
 639                                         fdt32_to_cpu(fdt_prop->nameoff));
 640                         len      = fdt32_to_cpu(fdt_prop->len);
 641                         nodep    = fdt_prop->data;
 642                         if (len < 0) {
 643                                 printf ("libfdt fdt_getprop(): %s\n",
 644                                         fdt_strerror(len));
 645                                 return 1;
 646                         } else if (len == 0) {
 647                                 /* the property has no value */
 648                                 if (level <= depth)
 649                                         printf("%s%s;\n",
 650                                                 &tabs[MAX_LEVEL - level],
 651                                                 pathp);
 652                         } else {
 653                                 if (level <= depth) {
 654                                         printf("%s%s = ",
 655                                                 &tabs[MAX_LEVEL - level],
 656                                                 pathp);
 657                                         print_data (nodep, len);
 658                                         printf(";\n");
 659                                 }
 660                         }
 661                         break;
 662                 case FDT_NOP:
 663                         printf("/* NOP */\n", &tabs[MAX_LEVEL - level]);
 664                         break;
 665                 case FDT_END:
 666                         return 1;
 667                 default:
 668                         if (level <= depth)
 669                                 printf("Unknown tag 0x%08X\n", tag);
 670                         return 1;
 671                 }
 672                 nodeoffset = nextoffset;
 673         }
 674         return 0;
 675 }
 676
 677 /********************************************************************/
 678
 679 U_BOOT_CMD(
 680         fdt,    5,      0,      do_fdt,
 681         "fdt     - flattened device tree utility commands\n",
 682             "addr   <addr> [<length>]        - Set the fdt location to <addr>\n"
 683 #ifdef CONFIG_OF_BOARD_SETUP
 684         "fdt boardsetup                      - Do board-specific set up\n"
 685 #endif
 686         "fdt move   <fdt> <newaddr> <length> - Copy the fdt to <addr> and make it active\n"
 687         "fdt print  <path> [<prop>]          - Recursive print starting at <path>\n"
 688         "fdt list   <path> [<prop>]          - Print one level starting at <path>\n"
 689         "fdt set    <path> <prop> [<val>]    - Set <property> [to <val>]\n"
 690         "fdt mknode <path> <node>            - Create a new node after <path>\n"
 691         "fdt rm     <path> [<prop>]          - Delete the node or <property>\n"
 692         "fdt chosen - Add/update the /chosen branch in the tree\n"
 693 #ifdef CONFIG_OF_HAS_UBOOT_ENV
 694         "fdt env    - Add/replace the /u-boot-env branch in the tree\n"
 695 #endif
 696 #ifdef CONFIG_OF_HAS_BD_T
 697         "fdt bd_t   - Add/replace the /bd_t branch in the tree\n"
 698 #endif
 699         "NOTE: If the path or property you are setting/printing has a '#' character\n"
 700         "     or spaces, you MUST escape it with a \\ character or quote it with \".\n"
 701 );