common/cmd_nvedit.c

   1 /*
   2  * (C) Copyright 2000-2010
   3  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   4  *
   5  * (C) Copyright 2001 Sysgo Real-Time Solutions, GmbH <www.elinos.com>
   6  * Andreas Heppel <aheppel@sysgo.de>
   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 /*
  28  * Support for persistent environment data
  29  *
  30  * The "environment" is stored on external storage as a list of '\0'
  31  * terminated "name=value" strings. The end of the list is marked by
  32  * a double '\0'. The environment is preceeded by a 32 bit CRC over
  33  * the data part and, in case of redundant environment, a byte of
  34  * flags.
  35  *
  36  * This linearized representation will also be used before
  37  * relocation, i. e. as long as we don't have a full C runtime
  38  * environment. After that, we use a hash table.
  39  */
  40
  41 #include <common.h>
  42 #include <command.h>
  43 #include <environment.h>
  44 #include <search.h>
  45 #include <errno.h>
  46 #include <malloc.h>
  47 #include <watchdog.h>
  48 #include <serial.h>
  49 #include <linux/stddef.h>
  50 #include <asm/byteorder.h>
  51 #if defined(CONFIG_CMD_NET)
  52 #include <net.h>
  53 #endif
  54
  55 DECLARE_GLOBAL_DATA_PTR;
  56
  57 #if !defined(CONFIG_ENV_IS_IN_EEPROM)   && \
  58     !defined(CONFIG_ENV_IS_IN_FLASH)    && \
  59     !defined(CONFIG_ENV_IS_IN_DATAFLASH)        && \
  60     !defined(CONFIG_ENV_IS_IN_MG_DISK)  && \
  61     !defined(CONFIG_ENV_IS_IN_MMC)  && \
  62     !defined(CONFIG_ENV_IS_IN_NAND)     && \
  63     !defined(CONFIG_ENV_IS_IN_NVRAM)    && \
  64     !defined(CONFIG_ENV_IS_IN_ONENAND)  && \
  65     !defined(CONFIG_ENV_IS_IN_SPI_FLASH)        && \
  66     !defined(CONFIG_ENV_IS_NOWHERE)
  67 # error Define one of CONFIG_ENV_IS_IN_{EEPROM|FLASH|DATAFLASH|ONENAND|\
  68 SPI_FLASH|MG_DISK|NVRAM|MMC} or CONFIG_ENV_IS_NOWHERE
  69 #endif
  70
  71 #define XMK_STR(x)      #x
  72 #define MK_STR(x)       XMK_STR(x)
  73
  74 /*
  75  * Maximum expected input data size for import command
  76  */
  77 #define MAX_ENV_SIZE    (1 << 20)       /* 1 MiB */
  78
  79 ulong load_addr = CONFIG_SYS_LOAD_ADDR; /* Default Load Address */
  80
  81 /*
  82  * Table with supported baudrates (defined in config_xyz.h)
  83  */
  84 static const unsigned long baudrate_table[] = CONFIG_SYS_BAUDRATE_TABLE;
  85 #define N_BAUDRATES (sizeof(baudrate_table) / sizeof(baudrate_table[0]))
  86
  87 /*
  88  * This variable is incremented on each do_env_set(), so it can
  89  * be used via get_env_id() as an indication, if the environment
  90  * has changed or not. So it is possible to reread an environment
  91  * variable only if the environment was changed ... done so for
  92  * example in NetInitLoop()
  93  */
  94 static int env_id = 1;
  95
  96 int get_env_id (void)
  97 {
  98         return env_id;
  99 }
 100
 101 /*
 102  * Command interface: print one or all environment variables
 103  *
 104  * Returns 0 in case of error, or length of printed string
 105  */
 106 static int env_print(char *name)
 107 {
 108         char *res = NULL;
 109         size_t len;
 110
 111         if (name) {             /* print a single name */
 112                 ENTRY e, *ep;
 113
 114                 e.key = name;
 115                 e.data = NULL;
 116                 hsearch_r(e, FIND, &ep, &env_htab);
 117                 if (ep == NULL)
 118                         return 0;
 119                 len = printf ("%s=%s\n", ep->key, ep->data);
 120                 return len;
 121         }
 122
 123         /* print whole list */
 124         len = hexport_r(&env_htab, '\n', &res, 0);
 125
 126         if (len > 0) {
 127                 puts(res);
 128                 free(res);
 129                 return len;
 130         }
 131
 132         /* should never happen */
 133         return 0;
 134 }
 135
 136 int do_env_print (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 137 {
 138         int i;
 139         int rcode = 0;
 140
 141         if (argc == 1) {
 142                 /* print all env vars */
 143                 rcode = env_print(NULL);
 144                 if (!rcode)
 145                         return 1;
 146                 printf("\nEnvironment size: %d/%ld bytes\n",
 147                         rcode, (ulong)ENV_SIZE);
 148                 return 0;
 149         }
 150
 151         /* print selected env vars */
 152         for (i = 1; i < argc; ++i) {
 153                 int rc = env_print(argv[i]);
 154                 if (!rc) {
 155                         printf("## Error: \"%s\" not defined\n", argv[i]);
 156                         ++rcode;
 157                 }
 158         }
 159
 160         return rcode;
 161 }
 162
 163 /*
 164  * Set a new environment variable,
 165  * or replace or delete an existing one.
 166  */
 167
 168 int _do_env_set (int flag, int argc, char * const argv[])
 169 {
 170         bd_t  *bd = gd->bd;
 171         int   i, len;
 172         int   console = -1;
 173         char  *name, *value, *s;
 174         ENTRY e, *ep;
 175
 176         name = argv[1];
 177
 178         if (strchr(name, '=')) {
 179                 printf ("## Error: illegal character '=' in variable name \"%s\"\n", name);
 180                 return 1;
 181         }
 182
 183         env_id++;
 184         /*
 185          * search if variable with this name already exists
 186          */
 187         e.key = name;
 188         e.data = NULL;
 189         hsearch_r(e, FIND, &ep, &env_htab);
 190
 191         /* Check for console redirection */
 192         if (strcmp(name,"stdin") == 0) {
 193                 console = stdin;
 194         } else if (strcmp(name,"stdout") == 0) {
 195                 console = stdout;
 196         } else if (strcmp(name,"stderr") == 0) {
 197                 console = stderr;
 198         }
 199
 200         if (console != -1) {
 201                 if (argc < 3) {         /* Cannot delete it! */
 202                         printf("Can't delete \"%s\"\n", name);
 203                         return 1;
 204                 }
 205
 206 #ifdef CONFIG_CONSOLE_MUX
 207                 i = iomux_doenv(console, argv[2]);
 208                 if (i)
 209                         return i;
 210 #else
 211                 /* Try assigning specified device */
 212                 if (console_assign (console, argv[2]) < 0)
 213                         return 1;
 214
 215 #ifdef CONFIG_SERIAL_MULTI
 216                 if (serial_assign (argv[2]) < 0)
 217                         return 1;
 218 #endif
 219 #endif /* CONFIG_CONSOLE_MUX */
 220         }
 221
 222         /*
 223          * Some variables like "ethaddr" and "serial#" can be set only
 224          * once and cannot be deleted; also, "ver" is readonly.
 225          */
 226         if (ep) {               /* variable exists */
 227 #ifndef CONFIG_ENV_OVERWRITE
 228                 if ((strcmp (name, "serial#") == 0) ||
 229                     ((strcmp (name, "ethaddr") == 0)
 230 #if defined(CONFIG_OVERWRITE_ETHADDR_ONCE) && defined(CONFIG_ETHADDR)
 231                      && (strcmp (ep->data,MK_STR(CONFIG_ETHADDR)) != 0)
 232 #endif  /* CONFIG_OVERWRITE_ETHADDR_ONCE && CONFIG_ETHADDR */
 233                     ) ) {
 234                         printf ("Can't overwrite \"%s\"\n", name);
 235                         return 1;
 236                 }
 237 #endif
 238                 /*
 239                  * Switch to new baudrate if new baudrate is supported
 240                  */
 241                 if (strcmp(name,"baudrate") == 0) {
 242                         int baudrate = simple_strtoul(argv[2], NULL, 10);
 243                         int i;
 244                         for (i=0; i<N_BAUDRATES; ++i) {
 245                                 if (baudrate == baudrate_table[i])
 246                                         break;
 247                         }
 248                         if (i == N_BAUDRATES) {
 249                                 printf ("## Baudrate %d bps not supported\n",
 250                                         baudrate);
 251                                 return 1;
 252                         }
 253                         printf ("## Switch baudrate to %d bps and press ENTER ...\n",
 254                                 baudrate);
 255                         udelay(50000);
 256                         gd->baudrate = baudrate;
 257 #if defined(CONFIG_PPC) || defined(CONFIG_MCF52x2)
 258                         gd->bd->bi_baudrate = baudrate;
 259 #endif
 260
 261                         serial_setbrg ();
 262                         udelay(50000);
 263                         for (;;) {
 264                                 if (getc() == '\r')
 265                                       break;
 266                         }
 267                 }
 268         }
 269
 270         /* Delete only ? */
 271         if ((argc < 3) || argv[2] == NULL) {
 272                 int rc = hdelete_r(name, &env_htab);
 273                 return !rc;
 274         }
 275
 276         /*
 277          * Insert / replace new value
 278          */
 279         for (i=2,len=0; i<argc; ++i) {
 280                 len += strlen(argv[i]) + 1;
 281         }
 282         if ((value = malloc(len)) == NULL) {
 283                 printf("## Can't malloc %d bytes\n", len);
 284                 return 1;
 285         }
 286         for (i=2,s=value; i<argc; ++i) {
 287                 char *v = argv[i];
 288
 289                 while ((*s++ = *v++) != '\0')
 290                         ;
 291                 *(s-1) = ' ';
 292         }
 293         if (s != value)
 294                 *--s = '\0';
 295
 296         e.key  = name;
 297         e.data = value;
 298         hsearch_r(e, ENTER, &ep, &env_htab);
 299         free(value);
 300         if (!ep) {
 301                 printf("## Error inserting \"%s\" variable, errno=%d\n",
 302                         name, errno);
 303                 return 1;
 304         }
 305
 306         /*
 307          * Some variables should be updated when the corresponding
 308          * entry in the environment is changed
 309          */
 310
 311         if (strcmp(name,"ipaddr") == 0) {
 312                 char *s = argv[2];      /* always use only one arg */
 313                 char *e;
 314                 unsigned long addr;
 315                 bd->bi_ip_addr = 0;
 316                 for (addr=0, i=0; i<4; ++i) {
 317                         ulong val = s ? simple_strtoul(s, &e, 10) : 0;
 318                         addr <<= 8;
 319                         addr  |= (val & 0xFF);
 320                         if (s) s = (*e) ? e+1 : e;
 321                 }
 322                 bd->bi_ip_addr = htonl(addr);
 323                 return 0;
 324         } else if (strcmp(argv[1],"loadaddr") == 0) {
 325                 load_addr = simple_strtoul(argv[2], NULL, 16);
 326                 return 0;
 327         }
 328 #if defined(CONFIG_CMD_NET)
 329         else if (strcmp(argv[1],"bootfile") == 0) {
 330                 copy_filename (BootFile, argv[2], sizeof(BootFile));
 331                 return 0;
 332         }
 333 #endif
 334         return 0;
 335 }
 336
 337 int setenv (char *varname, char *varvalue)
 338 {
 339         char * const argv[4] = { "setenv", varname, varvalue, NULL };
 340         if ((varvalue == NULL) || (varvalue[0] == '\0'))
 341                 return _do_env_set(0, 2, argv);
 342         else
 343                 return _do_env_set(0, 3, argv);
 344 }
 345
 346 int do_env_set (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 347 {
 348         if (argc < 2)
 349                 return cmd_usage(cmdtp);
 350
 351         return _do_env_set(flag, argc, argv);
 352 }
 353
 354 /*
 355  * Prompt for environment variable
 356  */
 357 #if defined(CONFIG_CMD_ASKENV)
 358 int do_env_ask ( cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 359 {
 360         extern char console_buffer[CONFIG_SYS_CBSIZE];
 361         char message[CONFIG_SYS_CBSIZE];
 362         int size = CONFIG_SYS_CBSIZE - 1;
 363         int i, len, pos;
 364         char *local_args[4];
 365
 366         local_args[0] = argv[0];
 367         local_args[1] = argv[1];
 368         local_args[2] = NULL;
 369         local_args[3] = NULL;
 370
 371         /* Check the syntax */
 372         switch (argc) {
 373         case 1:
 374                 return cmd_usage(cmdtp);
 375
 376         case 2:         /* env_ask envname */
 377                 sprintf(message, "Please enter '%s':", argv[1]);
 378                 break;
 379
 380         case 3:         /* env_ask envname size */
 381                 sprintf(message, "Please enter '%s':", argv[1]);
 382                 size = simple_strtoul(argv[2], NULL, 10);
 383                 break;
 384
 385         default:        /* env_ask envname message1 ... messagen size */
 386                 for (i=2,pos=0; i < argc - 1; i++) {
 387                         if (pos) {
 388                                 message[pos++] = ' ';
 389                         }
 390                         strcpy(message+pos, argv[i]);
 391                         pos += strlen(argv[i]);
 392                 }
 393                 message[pos] = '\0';
 394                 size = simple_strtoul(argv[argc - 1], NULL, 10);
 395                 break;
 396         }
 397
 398         if (size >= CONFIG_SYS_CBSIZE)
 399                 size = CONFIG_SYS_CBSIZE - 1;
 400
 401         if (size <= 0)
 402                 return 1;
 403
 404         /* prompt for input */
 405         len = readline(message);
 406
 407         if (size < len)
 408                 console_buffer[size] = '\0';
 409
 410         len = 2;
 411         if (console_buffer[0] != '\0') {
 412                 local_args[2] = console_buffer;
 413                 len = 3;
 414         }
 415
 416         /* Continue calling setenv code */
 417         return _do_env_set(flag, len, local_args);
 418 }
 419 #endif
 420
 421 /*
 422  * Interactively edit an environment variable
 423  */
 424 #if defined(CONFIG_CMD_EDITENV)
 425 int do_env_edit(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 426 {
 427         char buffer[CONFIG_SYS_CBSIZE];
 428         char *init_val;
 429         int len;
 430
 431         if (argc < 2)
 432                 return cmd_usage(cmdtp);
 433
 434         /* Set read buffer to initial value or empty sting */
 435         init_val = getenv(argv[1]);
 436         if (init_val)
 437                 len = sprintf(buffer, "%s", init_val);
 438         else
 439                 buffer[0] = '\0';
 440
 441         readline_into_buffer("edit: ", buffer);
 442
 443         return setenv(argv[1], buffer);
 444 }
 445 #endif /* CONFIG_CMD_EDITENV */
 446
 447 /*
 448  * Look up variable from environment,
 449  * return address of storage for that variable,
 450  * or NULL if not found
 451  */
 452 char *getenv (char *name)
 453 {
 454         if (gd->flags & GD_FLG_ENV_READY) {     /* after import into hashtable */
 455                 ENTRY e, *ep;
 456
 457                 WATCHDOG_RESET();
 458
 459                 e.key  = name;
 460                 e.data = NULL;
 461                 hsearch_r(e, FIND, &ep, &env_htab);
 462
 463                 return (ep ? ep->data : NULL);
 464         }
 465
 466         /* restricted capabilities before import */
 467
 468         if (getenv_f(name, (char *)(gd->env_buf), sizeof(gd->env_buf)) > 0)
 469                 return (char *)(gd->env_buf);
 470
 471         return NULL;
 472 }
 473
 474 /*
 475  * Look up variable from environment for restricted C runtime env.
 476  */
 477 int getenv_f (char *name, char *buf, unsigned len)
 478 {
 479         int i, nxt;
 480
 481         for (i=0; env_get_char(i) != '\0'; i=nxt+1) {
 482                 int val, n;
 483
 484                 for (nxt=i; env_get_char(nxt) != '\0'; ++nxt) {
 485                         if (nxt >= CONFIG_ENV_SIZE) {
 486                                 return (-1);
 487                         }
 488                 }
 489                 if ((val=envmatch((uchar *)name, i)) < 0)
 490                         continue;
 491
 492                 /* found; copy out */
 493                 for (n=0; n<len; ++n, ++buf) {
 494                         if ((*buf = env_get_char(val++)) == '\0')
 495                                 return n;
 496                 }
 497
 498                 if (n)
 499                         *--buf = '\0';
 500
 501                 printf("env_buf too small [%d]\n", len);
 502
 503                 return n;
 504         }
 505         return (-1);
 506 }
 507
 508 #if defined(CONFIG_CMD_SAVEENV) && !defined(CONFIG_ENV_IS_NOWHERE)
 509
 510 int do_env_save (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 511 {
 512         extern char * env_name_spec;
 513
 514         printf ("Saving Environment to %s...\n", env_name_spec);
 515
 516         return (saveenv() ? 1 : 0);
 517 }
 518
 519 U_BOOT_CMD(
 520         saveenv, 1, 0,  do_env_save,
 521         "save environment variables to persistent storage",
 522         ""
 523 );
 524
 525 #endif
 526
 527
 528 /*
 529  * Match a name / name=value pair
 530  *
 531  * s1 is either a simple 'name', or a 'name=value' pair.
 532  * i2 is the environment index for a 'name2=value2' pair.
 533  * If the names match, return the index for the value2, else NULL.
 534  */
 535
 536 int envmatch (uchar *s1, int i2)
 537 {
 538
 539         while (*s1 == env_get_char(i2++))
 540                 if (*s1++ == '=')
 541                         return(i2);
 542         if (*s1 == '\0' && env_get_char(i2-1) == '=')
 543                 return(i2);
 544         return(-1);
 545 }
 546
 547 static int do_env_default(cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
 548 {
 549         if ((argc != 2) || (strcmp(argv[1], "-f") != 0)) {
 550                 return cmd_usage(cmdtp);
 551         }
 552         set_default_env("## Resetting to default environment\n");
 553         return 0;
 554 }
 555
 556 static int do_env_delete(cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
 557 {
 558         printf("Not implemented yet\n");
 559         return 0;
 560 }
 561
 562 #ifdef CONFIG_CMD_EXPORTENV
 563 /*
 564  * env export [-t | -b | -c] addr [size]
 565  *      -t:     export as text format; if size is given, data will be
 566  *              padded with '\0' bytes; if not, one terminating '\0'
 567  *              will be added (which is included in the "filesize"
 568  *              setting so you can for exmple copy this to flash and
 569  *              keep the termination).
 570  *      -b:     export as binary format (name=value pairs separated by
 571  *              '\0', list end marked by double "\0\0")
 572  *      -c:     export as checksum protected environment format as
 573  *              used for example by "saveenv" command
 574  *      addr:   memory address where environment gets stored
 575  *      size:   size of output buffer
 576  *
 577  * With "-c" and size is NOT given, then the export command will
 578  * format the data as currently used for the persistent storage,
 579  * i. e. it will use CONFIG_ENV_SECT_SIZE as output block size and
 580  * prepend a valid CRC32 checksum and, in case of resundant
 581  * environment, a "current" redundancy flag. If size is given, this
 582  * value will be used instead of CONFIG_ENV_SECT_SIZE; again, CRC32
 583  * checksum and redundancy flag will be inserted.
 584  *
 585  * With "-b" and "-t", always only the real data (including a
 586  * terminating '\0' byte) will be written; here the optional size
 587  * argument will be used to make sure not to overflow the user
 588  * provided buffer; the command will abort if the size is not
 589  * sufficient. Any remainign space will be '\0' padded.
 590  *
 591  * On successful return, the variable "filesize" will be set.
 592  * Note that filesize includes the trailing/terminating '\0' byte(s).
 593  *
 594  * Usage szenario:  create a text snapshot/backup of the current settings:
 595  *
 596  *      => env export -t 100000
 597  *      => era ${backup_addr} +${filesize}
 598  *      => cp.b 100000 ${backup_addr} ${filesize}
 599  *
 600  * Re-import this snapshot, deleting all other settings:
 601  *
 602  *      => env import -d -t ${backup_addr}
 603  */
 604 static int do_env_export(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 605 {
 606         char    buf[32];
 607         char    *addr, *cmd, *res;
 608         size_t  size;
 609         ssize_t len;
 610         env_t   *envp;
 611         char    sep = '\n';
 612         int     chk = 0;
 613         int     fmt = 0;
 614
 615         cmd = *argv;
 616
 617         while (--argc > 0 && **++argv == '-') {
 618                 char *arg = *argv;
 619                 while (*++arg) {
 620                         switch (*arg) {
 621                         case 'b':               /* raw binary format */
 622                                 if (fmt++)
 623                                         goto sep_err;
 624                                 sep = '\0';
 625                                 break;
 626                         case 'c':               /* external checksum format */
 627                                 if (fmt++)
 628                                         goto sep_err;
 629                                 sep = '\0';
 630                                 chk = 1;
 631                                 break;
 632                         case 't':               /* text format */
 633                                 if (fmt++)
 634                                         goto sep_err;
 635                                 sep = '\n';
 636                                 break;
 637                         default:
 638                                 return cmd_usage(cmdtp);
 639                         }
 640                 }
 641         }
 642
 643         if (argc < 1) {
 644                 return cmd_usage(cmdtp);
 645         }
 646
 647         addr = (char *)simple_strtoul(argv[0], NULL, 16);
 648
 649         if (argc == 2) {
 650                 size = simple_strtoul(argv[1], NULL, 16);
 651                 memset(addr, '\0', size);
 652         } else {
 653                 size = 0;
 654         }
 655
 656         if (sep) {              /* export as text file */
 657                 len = hexport_r(&env_htab, sep, &addr, size);
 658                 if (len < 0) {
 659                         error("Cannot export environment: errno = %d\n",
 660                                 errno);
 661                         return 1;
 662                 }
 663                 sprintf(buf, "%zX", (size_t)len);
 664                 setenv("filesize", buf);
 665
 666                 return 0;
 667         }
 668
 669         envp = (env_t *)addr;
 670
 671         if (chk)                /* export as checksum protected block */
 672                 res = (char *)envp->data;
 673         else                    /* export as raw binary data */
 674                 res = addr;
 675
 676         len = hexport_r(&env_htab, '\0', &res, ENV_SIZE);
 677         if (len < 0) {
 678                 error("Cannot export environment: errno = %d\n",
 679                         errno);
 680                 return 1;
 681         }
 682
 683         if (chk) {
 684                 envp->crc   = crc32(0, envp->data, ENV_SIZE);
 685 #ifdef CONFIG_ENV_ADDR_REDUND
 686                 envp->flags = ACTIVE_FLAG;
 687 #endif
 688         }
 689         sprintf(buf, "%zX", (size_t)(len + offsetof(env_t,data)));
 690         setenv("filesize", buf);
 691
 692         return 0;
 693
 694 sep_err:
 695         printf("## %s: only one of \"-b\", \"-c\" or \"-t\" allowed\n",
 696                 cmd);
 697         return 1;
 698 }
 699 #endif
 700
 701 #ifdef CONFIG_CMD_IMPORTENV
 702 /*
 703  * env import [-d] [-t | -b | -c] addr [size]
 704  *      -d:     delete existing environment before importing;
 705  *              otherwise overwrite / append to existion definitions
 706  *      -t:     assume text format; either "size" must be given or the
 707  *              text data must be '\0' terminated
 708  *      -b:     assume binary format ('\0' separated, "\0\0" terminated)
 709  *      -c:     assume checksum protected environment format
 710  *      addr:   memory address to read from
 711  *      size:   length of input data; if missing, proper '\0'
 712  *              termination is mandatory
 713  */
 714 static int do_env_import(cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
 715 {
 716         char    *cmd, *addr;
 717         char    sep = '\n';
 718         int     chk = 0;
 719         int     fmt = 0;
 720         int     del = 0;
 721         size_t  size;
 722
 723         cmd = *argv;
 724
 725         while (--argc > 0 && **++argv == '-') {
 726                 char *arg = *argv;
 727                 while (*++arg) {
 728                         switch (*arg) {
 729                         case 'b':               /* raw binary format */
 730                                 if (fmt++)
 731                                         goto sep_err;
 732                                 sep = '\0';
 733                                 break;
 734                         case 'c':               /* external checksum format */
 735                                 if (fmt++)
 736                                         goto sep_err;
 737                                 sep = '\0';
 738                                 chk = 1;
 739                                 break;
 740                         case 't':               /* text format */
 741                                 if (fmt++)
 742                                         goto sep_err;
 743                                 sep = '\n';
 744                                 break;
 745                         case 'd':
 746                                 del = 1;
 747                                 break;
 748                         default:
 749                                 return cmd_usage(cmdtp);
 750                         }
 751                 }
 752         }
 753
 754         if (argc < 1) {
 755                 return cmd_usage(cmdtp);
 756         }
 757
 758         if (!fmt)
 759                 printf("## Warning: defaulting to text format\n");
 760
 761         addr = (char *)simple_strtoul(argv[0], NULL, 16);
 762
 763         if (argc == 2) {
 764                 size = simple_strtoul(argv[1], NULL, 16);
 765         } else {
 766                 char *s = addr;
 767
 768                 size = 0;
 769
 770                 while (size < MAX_ENV_SIZE) {
 771                         if ((*s == sep) && (*(s+1) == '\0'))
 772                                 break;
 773                         ++s;
 774                         ++size;
 775                 }
 776                 if (size == MAX_ENV_SIZE) {
 777                         printf("## Warning: Input data exceeds %d bytes"
 778                                 " - truncated\n", MAX_ENV_SIZE);
 779                 }
 780                 ++size;
 781                 printf("## Info: input data size = %zd = 0x%zX\n", size, size);
 782         }
 783
 784         if (chk) {
 785                 uint32_t crc;
 786                 env_t *ep = (env_t *)addr;
 787
 788                 size -= offsetof(env_t, data);
 789                 memcpy(&crc, &ep->crc, sizeof(crc));
 790
 791                 if (crc32(0, ep->data, size) != crc) {
 792                         puts("## Error: bad CRC, import failed\n");
 793                         return 1;
 794                 }
 795                 addr = (char *)ep->data;
 796         }
 797
 798         if (himport_r(&env_htab, addr, size, sep, del ? 0 : H_NOCLEAR) == 0) {
 799                 error("Environment import failed: errno = %d\n", errno);
 800                 return 1;
 801         }
 802         gd->flags |= GD_FLG_ENV_READY;
 803
 804         return 0;
 805
 806 sep_err:
 807         printf("## %s: only one of \"-b\", \"-c\" or \"-t\" allowed\n",
 808                 cmd);
 809         return 1;
 810 }
 811 #endif
 812
 813 #if defined(CONFIG_CMD_RUN)
 814 extern int do_run (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]);
 815 #endif
 816
 817 /*
 818  * New command line interface: "env" command with subcommands
 819  */
 820 static cmd_tbl_t cmd_env_sub[] = {
 821 #if defined(CONFIG_CMD_ASKENV)
 822         U_BOOT_CMD_MKENT(ask, CONFIG_SYS_MAXARGS, 1, do_env_ask, "", ""),
 823 #endif
 824         U_BOOT_CMD_MKENT(default, 1, 0, do_env_default, "", ""),
 825         U_BOOT_CMD_MKENT(delete, 2, 0, do_env_delete, "", ""),
 826 #if defined(CONFIG_CMD_EDITENV)
 827         U_BOOT_CMD_MKENT(edit, 2, 0, do_env_edit, "", ""),
 828 #endif
 829 #if defined(CONFIG_CMD_EXPORTENV)
 830         U_BOOT_CMD_MKENT(export, 4, 0, do_env_export, "", ""),
 831 #endif
 832 #if defined(CONFIG_CMD_IMPORTENV)
 833         U_BOOT_CMD_MKENT(import, 5, 0, do_env_import, "", ""),
 834 #endif
 835         U_BOOT_CMD_MKENT(print, CONFIG_SYS_MAXARGS, 1, do_env_print, "", ""),
 836 #if defined(CONFIG_CMD_RUN)
 837         U_BOOT_CMD_MKENT(run, CONFIG_SYS_MAXARGS, 1, do_run, "", ""),
 838 #endif
 839 #if defined(CONFIG_CMD_SAVEENV) && !defined(CONFIG_ENV_IS_NOWHERE)
 840         U_BOOT_CMD_MKENT(save, 1, 0, do_env_save, "", ""),
 841 #endif
 842         U_BOOT_CMD_MKENT(set, CONFIG_SYS_MAXARGS, 0, do_env_set, "", ""),
 843 };
 844
 845 #if defined(CONFIG_NEEDS_MANUAL_RELOC)
 846 void env_reloc(void)
 847 {
 848         fixup_cmdtable(cmd_env_sub, ARRAY_SIZE(cmd_env_sub));
 849 }
 850 #endif
 851
 852 static int do_env (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 853 {
 854         cmd_tbl_t *cp;
 855
 856         if (argc < 2)
 857                 return cmd_usage(cmdtp);
 858
 859         /* drop initial "env" arg */
 860         argc--;
 861         argv++;
 862
 863         cp = find_cmd_tbl(argv[0], cmd_env_sub, ARRAY_SIZE(cmd_env_sub));
 864
 865         if (cp)
 866                 return cp->cmd(cmdtp, flag, argc, argv);
 867
 868         return cmd_usage(cmdtp);
 869 }
 870
 871 U_BOOT_CMD(
 872         env, CONFIG_SYS_MAXARGS, 1, do_env,
 873         "environment handling commands",
 874 #if defined(CONFIG_CMD_ASKENV)
 875         "ask name [message] [size] - ask for environment variable\nenv "
 876 #endif
 877         "default -f - reset default environment\n"
 878 #if defined(CONFIG_CMD_EDITENV)
 879         "env edit name - edit environment variable\n"
 880 #endif
 881         "env export [-t | -b | -c] addr [size] - export environmnt\n"
 882         "env import [-d] [-t | -b | -c] addr [size] - import environmnt\n"
 883         "env print [name ...] - print environment\n"
 884 #if defined(CONFIG_CMD_RUN)
 885         "env run var [...] - run commands in an environment variable\n"
 886 #endif
 887         "env save - save environment\n"
 888         "env set [-f] name [arg ...]\n"
 889 );
 890
 891 /*
 892  * Old command line interface, kept for compatibility
 893  */
 894
 895 #if defined(CONFIG_CMD_EDITENV)
 896 U_BOOT_CMD_COMPLETE(
 897         editenv, 2, 0,  do_env_edit,
 898         "edit environment variable",
 899         "name\n"
 900         "    - edit environment variable 'name'",
 901         var_complete
 902 );
 903 #endif
 904
 905 U_BOOT_CMD_COMPLETE(
 906         printenv, CONFIG_SYS_MAXARGS, 1,        do_env_print,
 907         "print environment variables",
 908         "\n    - print values of all environment variables\n"
 909         "printenv name ...\n"
 910         "    - print value of environment variable 'name'",
 911         var_complete
 912 );
 913
 914 U_BOOT_CMD_COMPLETE(
 915         setenv, CONFIG_SYS_MAXARGS, 0,  do_env_set,
 916         "set environment variables",
 917         "name value ...\n"
 918         "    - set environment variable 'name' to 'value ...'\n"
 919         "setenv name\n"
 920         "    - delete environment variable 'name'",
 921         var_complete
 922 );
 923
 924 #if defined(CONFIG_CMD_ASKENV)
 925
 926 U_BOOT_CMD(
 927         askenv, CONFIG_SYS_MAXARGS,     1,      do_env_ask,
 928         "get environment variables from stdin",
 929         "name [message] [size]\n"
 930         "    - get environment variable 'name' from stdin (max 'size' chars)\n"
 931         "askenv name\n"
 932         "    - get environment variable 'name' from stdin\n"
 933         "askenv name size\n"
 934         "    - get environment variable 'name' from stdin (max 'size' chars)\n"
 935         "askenv name [message] size\n"
 936         "    - display 'message' string and get environment variable 'name'"
 937         "from stdin (max 'size' chars)"
 938 );
 939 #endif
 940
 941 #if defined(CONFIG_CMD_RUN)
 942 U_BOOT_CMD_COMPLETE(
 943         run,    CONFIG_SYS_MAXARGS,     1,      do_run,
 944         "run commands in an environment variable",
 945         "var [...]\n"
 946         "    - run the commands in the environment variable(s) 'var'",
 947         var_complete
 948 );
 949 #endif