1 /* 2 * (C) Copyright 2000-2010 3 * Wolfgang Denk, DENX Software Engineering, wd@denx.de. 4 * 5 * (C) Copyright 2008 6 * Guennadi Liakhovetski, DENX Software Engineering, lg@denx.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 #include <errno.h> 28 #include <fcntl.h> 29 #include <stdio.h> 30 #include <stdlib.h> 31 #include <stddef.h> 32 #include <string.h> 33 #include <sys/types.h> 34 #include <sys/ioctl.h> 35 #include <sys/stat.h> 36 #include <unistd.h> 37 38 #ifdef MTD_OLD 39 # include <stdint.h> 40 # include <linux/mtd/mtd.h> 41 #else 42 # define __user /* nothing */ 43 # include <mtd/mtd-user.h> 44 #endif 45 46 #include "fw_env.h" 47 48 #define WHITESPACE(c) ((c == '\t') || (c == ' ')) 49 50 #define min(x, y) ({ \ 51 typeof(x) _min1 = (x); \ 52 typeof(y) _min2 = (y); \ 53 (void) (&_min1 == &_min2); \ 54 _min1 < _min2 ? _min1 : _min2; }) 55 56 struct envdev_s { 57 char devname[16]; /* Device name */ 58 ulong devoff; /* Device offset */ 59 ulong env_size; /* environment size */ 60 ulong erase_size; /* device erase size */ 61 ulong env_sectors; /* number of environment sectors */ 62 uint8_t mtd_type; /* type of the MTD device */ 63 }; 64 65 static struct envdev_s envdevices[2] = 66 { 67 { 68 .mtd_type = MTD_ABSENT, 69 }, { 70 .mtd_type = MTD_ABSENT, 71 }, 72 }; 73 static int dev_current; 74 75 #define DEVNAME(i) envdevices[(i)].devname 76 #define DEVOFFSET(i) envdevices[(i)].devoff 77 #define ENVSIZE(i) envdevices[(i)].env_size 78 #define DEVESIZE(i) envdevices[(i)].erase_size 79 #define ENVSECTORS(i) envdevices[(i)].env_sectors 80 #define DEVTYPE(i) envdevices[(i)].mtd_type 81 82 #define CONFIG_ENV_SIZE ENVSIZE(dev_current) 83 84 #define ENV_SIZE getenvsize() 85 86 struct env_image_single { 87 uint32_t crc; /* CRC32 over data bytes */ 88 char data[]; 89 }; 90 91 struct env_image_redundant { 92 uint32_t crc; /* CRC32 over data bytes */ 93 unsigned char flags; /* active or obsolete */ 94 char data[]; 95 }; 96 97 enum flag_scheme { 98 FLAG_NONE, 99 FLAG_BOOLEAN, 100 FLAG_INCREMENTAL, 101 }; 102 103 struct environment { 104 void *image; 105 uint32_t *crc; 106 unsigned char *flags; 107 char *data; 108 enum flag_scheme flag_scheme; 109 }; 110 111 static struct environment environment = { 112 .flag_scheme = FLAG_NONE, 113 }; 114 115 static int HaveRedundEnv = 0; 116 117 static unsigned char active_flag = 1; 118 /* obsolete_flag must be 0 to efficiently set it on NOR flash without erasing */ 119 static unsigned char obsolete_flag = 0; 120 121 122 #define XMK_STR(x) #x 123 #define MK_STR(x) XMK_STR(x) 124 125 static char default_environment[] = { 126 #if defined(CONFIG_BOOTARGS) 127 "bootargs=" CONFIG_BOOTARGS "\0" 128 #endif 129 #if defined(CONFIG_BOOTCOMMAND) 130 "bootcmd=" CONFIG_BOOTCOMMAND "\0" 131 #endif 132 #if defined(CONFIG_RAMBOOTCOMMAND) 133 "ramboot=" CONFIG_RAMBOOTCOMMAND "\0" 134 #endif 135 #if defined(CONFIG_NFSBOOTCOMMAND) 136 "nfsboot=" CONFIG_NFSBOOTCOMMAND "\0" 137 #endif 138 #if defined(CONFIG_BOOTDELAY) && (CONFIG_BOOTDELAY >= 0) 139 "bootdelay=" MK_STR (CONFIG_BOOTDELAY) "\0" 140 #endif 141 #if defined(CONFIG_BAUDRATE) && (CONFIG_BAUDRATE >= 0) 142 "baudrate=" MK_STR (CONFIG_BAUDRATE) "\0" 143 #endif 144 #ifdef CONFIG_LOADS_ECHO 145 "loads_echo=" MK_STR (CONFIG_LOADS_ECHO) "\0" 146 #endif 147 #ifdef CONFIG_ETHADDR 148 "ethaddr=" MK_STR (CONFIG_ETHADDR) "\0" 149 #endif 150 #ifdef CONFIG_ETH1ADDR 151 "eth1addr=" MK_STR (CONFIG_ETH1ADDR) "\0" 152 #endif 153 #ifdef CONFIG_ETH2ADDR 154 "eth2addr=" MK_STR (CONFIG_ETH2ADDR) "\0" 155 #endif 156 #ifdef CONFIG_ETH3ADDR 157 "eth3addr=" MK_STR (CONFIG_ETH3ADDR) "\0" 158 #endif 159 #ifdef CONFIG_ETH4ADDR 160 "eth4addr=" MK_STR (CONFIG_ETH4ADDR) "\0" 161 #endif 162 #ifdef CONFIG_ETH5ADDR 163 "eth5addr=" MK_STR (CONFIG_ETH5ADDR) "\0" 164 #endif 165 #ifdef CONFIG_ETHPRIME 166 "ethprime=" CONFIG_ETHPRIME "\0" 167 #endif 168 #ifdef CONFIG_IPADDR 169 "ipaddr=" MK_STR (CONFIG_IPADDR) "\0" 170 #endif 171 #ifdef CONFIG_SERVERIP 172 "serverip=" MK_STR (CONFIG_SERVERIP) "\0" 173 #endif 174 #ifdef CONFIG_SYS_AUTOLOAD 175 "autoload=" CONFIG_SYS_AUTOLOAD "\0" 176 #endif 177 #ifdef CONFIG_ROOTPATH 178 "rootpath=" MK_STR (CONFIG_ROOTPATH) "\0" 179 #endif 180 #ifdef CONFIG_GATEWAYIP 181 "gatewayip=" MK_STR (CONFIG_GATEWAYIP) "\0" 182 #endif 183 #ifdef CONFIG_NETMASK 184 "netmask=" MK_STR (CONFIG_NETMASK) "\0" 185 #endif 186 #ifdef CONFIG_HOSTNAME 187 "hostname=" MK_STR (CONFIG_HOSTNAME) "\0" 188 #endif 189 #ifdef CONFIG_BOOTFILE 190 "bootfile=" MK_STR (CONFIG_BOOTFILE) "\0" 191 #endif 192 #ifdef CONFIG_LOADADDR 193 "loadaddr=" MK_STR (CONFIG_LOADADDR) "\0" 194 #endif 195 #ifdef CONFIG_PREBOOT 196 "preboot=" CONFIG_PREBOOT "\0" 197 #endif 198 #ifdef CONFIG_CLOCKS_IN_MHZ 199 "clocks_in_mhz=" "1" "\0" 200 #endif 201 #if defined(CONFIG_PCI_BOOTDELAY) && (CONFIG_PCI_BOOTDELAY > 0) 202 "pcidelay=" MK_STR (CONFIG_PCI_BOOTDELAY) "\0" 203 #endif 204 #ifdef CONFIG_EXTRA_ENV_SETTINGS 205 CONFIG_EXTRA_ENV_SETTINGS 206 #endif 207 "\0" /* Termimate struct environment data with 2 NULs */ 208 }; 209 210 static int flash_io (int mode); 211 static char *envmatch (char * s1, char * s2); 212 static int parse_config (void); 213 214 #if defined(CONFIG_FILE) 215 static int get_config (char *); 216 #endif 217 static inline ulong getenvsize (void) 218 { 219 ulong rc = CONFIG_ENV_SIZE - sizeof (long); 220 221 if (HaveRedundEnv) 222 rc -= sizeof (char); 223 return rc; 224 } 225 226 static char *fw_string_blank(char *s, int noblank) 227 { 228 int i; 229 int len = strlen(s); 230 231 for (i = 0; i < len; i++, s++) { 232 if ((noblank && !WHITESPACE(*s)) || 233 (!noblank && WHITESPACE(*s))) 234 break; 235 } 236 if (i == len) 237 return NULL; 238 239 return s; 240 } 241 242 /* 243 * Search the environment for a variable. 244 * Return the value, if found, or NULL, if not found. 245 */ 246 char *fw_getenv (char *name) 247 { 248 char *env, *nxt; 249 250 if (fw_env_open()) 251 return NULL; 252 253 for (env = environment.data; *env; env = nxt + 1) { 254 char *val; 255 256 for (nxt = env; *nxt; ++nxt) { 257 if (nxt >= &environment.data[ENV_SIZE]) { 258 fprintf (stderr, "## Error: " 259 "environment not terminated\n"); 260 return NULL; 261 } 262 } 263 val = envmatch (name, env); 264 if (!val) 265 continue; 266 return val; 267 } 268 return NULL; 269 } 270 271 /* 272 * Print the current definition of one, or more, or all 273 * environment variables 274 */ 275 int fw_printenv (int argc, char *argv[]) 276 { 277 char *env, *nxt; 278 int i, n_flag; 279 int rc = 0; 280 281 if (fw_env_open()) 282 return -1; 283 284 if (argc == 1) { /* Print all env variables */ 285 for (env = environment.data; *env; env = nxt + 1) { 286 for (nxt = env; *nxt; ++nxt) { 287 if (nxt >= &environment.data[ENV_SIZE]) { 288 fprintf (stderr, "## Error: " 289 "environment not terminated\n"); 290 return -1; 291 } 292 } 293 294 printf ("%s\n", env); 295 } 296 return 0; 297 } 298 299 if (strcmp (argv[1], "-n") == 0) { 300 n_flag = 1; 301 ++argv; 302 --argc; 303 if (argc != 2) { 304 fprintf (stderr, "## Error: " 305 "`-n' option requires exactly one argument\n"); 306 return -1; 307 } 308 } else { 309 n_flag = 0; 310 } 311 312 for (i = 1; i < argc; ++i) { /* print single env variables */ 313 char *name = argv[i]; 314 char *val = NULL; 315 316 for (env = environment.data; *env; env = nxt + 1) { 317 318 for (nxt = env; *nxt; ++nxt) { 319 if (nxt >= &environment.data[ENV_SIZE]) { 320 fprintf (stderr, "## Error: " 321 "environment not terminated\n"); 322 return -1; 323 } 324 } 325 val = envmatch (name, env); 326 if (val) { 327 if (!n_flag) { 328 fputs (name, stdout); 329 putc ('=', stdout); 330 } 331 puts (val); 332 break; 333 } 334 } 335 if (!val) { 336 fprintf (stderr, "## Error: \"%s\" not defined\n", name); 337 rc = -1; 338 } 339 } 340 341 return rc; 342 } 343 344 int fw_env_close(void) 345 { 346 /* 347 * Update CRC 348 */ 349 *environment.crc = crc32(0, (uint8_t *) environment.data, ENV_SIZE); 350 351 /* write environment back to flash */ 352 if (flash_io(O_RDWR)) { 353 fprintf(stderr, 354 "Error: can't write fw_env to flash\n"); 355 return -1; 356 } 357 358 return 0; 359 } 360 361 362 /* 363 * Set/Clear a single variable in the environment. 364 * This is called in sequence to update the environment 365 * in RAM without updating the copy in flash after each set 366 */ 367 int fw_env_write(char *name, char *value) 368 { 369 int len; 370 char *env, *nxt; 371 char *oldval = NULL; 372 373 /* 374 * search if variable with this name already exists 375 */ 376 for (nxt = env = environment.data; *env; env = nxt + 1) { 377 for (nxt = env; *nxt; ++nxt) { 378 if (nxt >= &environment.data[ENV_SIZE]) { 379 fprintf(stderr, "## Error: " 380 "environment not terminated\n"); 381 errno = EINVAL; 382 return -1; 383 } 384 } 385 if ((oldval = envmatch (name, env)) != NULL) 386 break; 387 } 388 389 /* 390 * Delete any existing definition 391 */ 392 if (oldval) { 393 /* 394 * Ethernet Address and serial# can be set only once 395 */ 396 if ((strcmp (name, "ethaddr") == 0) || 397 (strcmp (name, "serial#") == 0)) { 398 fprintf (stderr, "Can't overwrite \"%s\"\n", name); 399 errno = EROFS; 400 return -1; 401 } 402 403 if (*++nxt == '\0') { 404 *env = '\0'; 405 } else { 406 for (;;) { 407 *env = *nxt++; 408 if ((*env == '\0') && (*nxt == '\0')) 409 break; 410 ++env; 411 } 412 } 413 *++env = '\0'; 414 } 415 416 /* Delete only ? */ 417 if (!value || !strlen(value)) 418 return 0; 419 420 /* 421 * Append new definition at the end 422 */ 423 for (env = environment.data; *env || *(env + 1); ++env); 424 if (env > environment.data) 425 ++env; 426 /* 427 * Overflow when: 428 * "name" + "=" + "val" +"\0\0" > CONFIG_ENV_SIZE - (env-environment) 429 */ 430 len = strlen (name) + 2; 431 /* add '=' for first arg, ' ' for all others */ 432 len += strlen(value) + 1; 433 434 if (len > (&environment.data[ENV_SIZE] - env)) { 435 fprintf (stderr, 436 "Error: environment overflow, \"%s\" deleted\n", 437 name); 438 return -1; 439 } 440 441 while ((*env = *name++) != '\0') 442 env++; 443 *env = '='; 444 while ((*++env = *value++) != '\0') 445 ; 446 447 /* end is marked with double '\0' */ 448 *++env = '\0'; 449 450 return 0; 451 } 452 453 /* 454 * Deletes or sets environment variables. Returns -1 and sets errno error codes: 455 * 0 - OK 456 * EINVAL - need at least 1 argument 457 * EROFS - certain variables ("ethaddr", "serial#") cannot be 458 * modified or deleted 459 * 460 */ 461 int fw_setenv(int argc, char *argv[]) 462 { 463 int i, len; 464 char *name; 465 char *value = NULL; 466 char *tmpval = NULL; 467 468 if (argc < 2) { 469 errno = EINVAL; 470 return -1; 471 } 472 473 if (fw_env_open()) { 474 fprintf(stderr, "Error: environment not initialized\n"); 475 return -1; 476 } 477 478 name = argv[1]; 479 480 len = strlen(name) + 2; 481 for (i = 2; i < argc; ++i) 482 len += strlen(argv[i]) + 1; 483 484 /* Allocate enough place to the data string */ 485 for (i = 2; i < argc; ++i) { 486 char *val = argv[i]; 487 if (!value) { 488 value = (char *)malloc(len - strlen(name)); 489 if (!value) { 490 fprintf(stderr, 491 "Cannot malloc %u bytes: %s\n", 492 len - strlen(name), strerror(errno)); 493 return -1; 494 } 495 memset(value, 0, len - strlen(name)); 496 tmpval = value; 497 } 498 if (i != 2) 499 *tmpval++ = ' '; 500 while (*val != '\0') 501 *tmpval++ = *val++; 502 } 503 504 fw_env_write(name, value); 505 506 if (value) 507 free(value); 508 509 return fw_env_close(); 510 } 511 512 /* 513 * Parse a file and configure the u-boot variables. 514 * The script file has a very simple format, as follows: 515 * 516 * Each line has a couple with name, value: 517 * <white spaces>variable_name<white spaces>variable_value 518 * 519 * Both variable_name and variable_value are interpreted as strings. 520 * Any character after <white spaces> and before ending \r\n is interpreted 521 * as variable's value (no comment allowed on these lines !) 522 * 523 * Comments are allowed if the first character in the line is # 524 * 525 * Returns -1 and sets errno error codes: 526 * 0 - OK 527 * -1 - Error 528 */ 529 int fw_parse_script(char *fname) 530 { 531 FILE *fp; 532 char dump[1024]; /* Maximum line length in the file */ 533 char *name; 534 char *val; 535 int lineno = 0; 536 int len; 537 int ret = 0; 538 539 if (fw_env_open()) { 540 fprintf(stderr, "Error: environment not initialized\n"); 541 return -1; 542 } 543 544 if (strcmp(fname, "-") == 0) 545 fp = stdin; 546 else { 547 fp = fopen(fname, "r"); 548 if (fp == NULL) { 549 fprintf(stderr, "I cannot open %s for reading\n", 550 fname); 551 return -1; 552 } 553 } 554 555 while (fgets(dump, sizeof(dump), fp)) { 556 lineno++; 557 len = strlen(dump); 558 559 /* 560 * Read a whole line from the file. If the line is too long 561 * or is not terminated, reports an error and exit. 562 */ 563 if (dump[len - 1] != '\n') { 564 fprintf(stderr, 565 "Line %d not corrected terminated or too long\n", 566 lineno); 567 ret = -1; 568 break; 569 } 570 571 /* Drop ending line feed / carriage return */ 572 while (len > 0 && (dump[len - 1] == '\n' || 573 dump[len - 1] == '\r')) { 574 dump[len - 1] = '\0'; 575 len--; 576 } 577 578 /* Skip comment or empty lines */ 579 if ((len == 0) || dump[0] == '#') 580 continue; 581 582 /* 583 * Search for variable's name, 584 * remove leading whitespaces 585 */ 586 name = fw_string_blank(dump, 1); 587 if (!name) 588 continue; 589 590 /* The first white space is the end of variable name */ 591 val = fw_string_blank(name, 0); 592 len = strlen(name); 593 if (val) { 594 *val++ = '\0'; 595 if ((val - name) < len) 596 val = fw_string_blank(val, 1); 597 else 598 val = NULL; 599 } 600 601 #ifdef DEBUG 602 fprintf(stderr, "Setting %s : %s\n", 603 name, val ? val : " removed"); 604 #endif 605 606 /* 607 * If there is an error setting a variable, 608 * try to save the environment and returns an error 609 */ 610 if (fw_env_write(name, val)) { 611 fprintf(stderr, 612 "fw_env_write returns with error : %s\n", 613 strerror(errno)); 614 ret = -1; 615 break; 616 } 617 618 } 619 620 /* Close file if not stdin */ 621 if (strcmp(fname, "-") != 0) 622 fclose(fp); 623 624 ret |= fw_env_close(); 625 626 return ret; 627 628 } 629 630 /* 631 * Test for bad block on NAND, just returns 0 on NOR, on NAND: 632 * 0 - block is good 633 * > 0 - block is bad 634 * < 0 - failed to test 635 */ 636 static int flash_bad_block (int fd, uint8_t mtd_type, loff_t *blockstart) 637 { 638 if (mtd_type == MTD_NANDFLASH) { 639 int badblock = ioctl (fd, MEMGETBADBLOCK, blockstart); 640 641 if (badblock < 0) { 642 perror ("Cannot read bad block mark"); 643 return badblock; 644 } 645 646 if (badblock) { 647 #ifdef DEBUG 648 fprintf (stderr, "Bad block at 0x%llx, " 649 "skipping\n", *blockstart); 650 #endif 651 return badblock; 652 } 653 } 654 655 return 0; 656 } 657 658 /* 659 * Read data from flash at an offset into a provided buffer. On NAND it skips 660 * bad blocks but makes sure it stays within ENVSECTORS (dev) starting from 661 * the DEVOFFSET (dev) block. On NOR the loop is only run once. 662 */ 663 static int flash_read_buf (int dev, int fd, void *buf, size_t count, 664 off_t offset, uint8_t mtd_type) 665 { 666 size_t blocklen; /* erase / write length - one block on NAND, 667 0 on NOR */ 668 size_t processed = 0; /* progress counter */ 669 size_t readlen = count; /* current read length */ 670 off_t top_of_range; /* end of the last block we may use */ 671 off_t block_seek; /* offset inside the current block to the start 672 of the data */ 673 loff_t blockstart; /* running start of the current block - 674 MEMGETBADBLOCK needs 64 bits */ 675 int rc; 676 677 /* 678 * Start of the first block to be read, relies on the fact, that 679 * erase sector size is always a power of 2 680 */ 681 blockstart = offset & ~(DEVESIZE (dev) - 1); 682 683 /* Offset inside a block */ 684 block_seek = offset - blockstart; 685 686 if (mtd_type == MTD_NANDFLASH) { 687 /* 688 * NAND: calculate which blocks we are reading. We have 689 * to read one block at a time to skip bad blocks. 690 */ 691 blocklen = DEVESIZE (dev); 692 693 /* 694 * To calculate the top of the range, we have to use the 695 * global DEVOFFSET (dev), which can be different from offset 696 */ 697 top_of_range = (DEVOFFSET (dev) & ~(blocklen - 1)) + 698 ENVSECTORS (dev) * blocklen; 699 700 /* Limit to one block for the first read */ 701 if (readlen > blocklen - block_seek) 702 readlen = blocklen - block_seek; 703 } else { 704 blocklen = 0; 705 top_of_range = offset + count; 706 } 707 708 /* This only runs once on NOR flash */ 709 while (processed < count) { 710 rc = flash_bad_block (fd, mtd_type, &blockstart); 711 if (rc < 0) /* block test failed */ 712 return -1; 713 714 if (blockstart + block_seek + readlen > top_of_range) { 715 /* End of range is reached */ 716 fprintf (stderr, 717 "Too few good blocks within range\n"); 718 return -1; 719 } 720 721 if (rc) { /* block is bad */ 722 blockstart += blocklen; 723 continue; 724 } 725 726 /* 727 * If a block is bad, we retry in the next block at the same 728 * offset - see common/env_nand.c::writeenv() 729 */ 730 lseek (fd, blockstart + block_seek, SEEK_SET); 731 732 rc = read (fd, buf + processed, readlen); 733 if (rc != readlen) { 734 fprintf (stderr, "Read error on %s: %s\n", 735 DEVNAME (dev), strerror (errno)); 736 return -1; 737 } 738 #ifdef DEBUG 739 fprintf (stderr, "Read 0x%x bytes at 0x%llx\n", 740 rc, blockstart + block_seek); 741 #endif 742 processed += readlen; 743 readlen = min (blocklen, count - processed); 744 block_seek = 0; 745 blockstart += blocklen; 746 } 747 748 return processed; 749 } 750 751 /* 752 * Write count bytes at offset, but stay within ENVSETCORS (dev) sectors of 753 * DEVOFFSET (dev). Similar to the read case above, on NOR we erase and write 754 * the whole data at once. 755 */ 756 static int flash_write_buf (int dev, int fd, void *buf, size_t count, 757 off_t offset, uint8_t mtd_type) 758 { 759 void *data; 760 struct erase_info_user erase; 761 size_t blocklen; /* length of NAND block / NOR erase sector */ 762 size_t erase_len; /* whole area that can be erased - may include 763 bad blocks */ 764 size_t erasesize; /* erase / write length - one block on NAND, 765 whole area on NOR */ 766 size_t processed = 0; /* progress counter */ 767 size_t write_total; /* total size to actually write - excludinig 768 bad blocks */ 769 off_t erase_offset; /* offset to the first erase block (aligned) 770 below offset */ 771 off_t block_seek; /* offset inside the erase block to the start 772 of the data */ 773 off_t top_of_range; /* end of the last block we may use */ 774 loff_t blockstart; /* running start of the current block - 775 MEMGETBADBLOCK needs 64 bits */ 776 int rc; 777 778 blocklen = DEVESIZE (dev); 779 780 /* Erase sector size is always a power of 2 */ 781 top_of_range = (DEVOFFSET (dev) & ~(blocklen - 1)) + 782 ENVSECTORS (dev) * blocklen; 783 784 erase_offset = offset & ~(blocklen - 1); 785 786 /* Maximum area we may use */ 787 erase_len = top_of_range - erase_offset; 788 789 blockstart = erase_offset; 790 /* Offset inside a block */ 791 block_seek = offset - erase_offset; 792 793 /* 794 * Data size we actually have to write: from the start of the block 795 * to the start of the data, then count bytes of data, and to the 796 * end of the block 797 */ 798 write_total = (block_seek + count + blocklen - 1) & ~(blocklen - 1); 799 800 /* 801 * Support data anywhere within erase sectors: read out the complete 802 * area to be erased, replace the environment image, write the whole 803 * block back again. 804 */ 805 if (write_total > count) { 806 data = malloc (erase_len); 807 if (!data) { 808 fprintf (stderr, 809 "Cannot malloc %u bytes: %s\n", 810 erase_len, strerror (errno)); 811 return -1; 812 } 813 814 rc = flash_read_buf (dev, fd, data, write_total, erase_offset, 815 mtd_type); 816 if (write_total != rc) 817 return -1; 818 819 /* Overwrite the old environment */ 820 memcpy (data + block_seek, buf, count); 821 } else { 822 /* 823 * We get here, iff offset is block-aligned and count is a 824 * multiple of blocklen - see write_total calculation above 825 */ 826 data = buf; 827 } 828 829 if (mtd_type == MTD_NANDFLASH) { 830 /* 831 * NAND: calculate which blocks we are writing. We have 832 * to write one block at a time to skip bad blocks. 833 */ 834 erasesize = blocklen; 835 } else { 836 erasesize = erase_len; 837 } 838 839 erase.length = erasesize; 840 841 /* This only runs once on NOR flash */ 842 while (processed < write_total) { 843 rc = flash_bad_block (fd, mtd_type, &blockstart); 844 if (rc < 0) /* block test failed */ 845 return rc; 846 847 if (blockstart + erasesize > top_of_range) { 848 fprintf (stderr, "End of range reached, aborting\n"); 849 return -1; 850 } 851 852 if (rc) { /* block is bad */ 853 blockstart += blocklen; 854 continue; 855 } 856 857 erase.start = blockstart; 858 ioctl (fd, MEMUNLOCK, &erase); 859 860 if (ioctl (fd, MEMERASE, &erase) != 0) { 861 fprintf (stderr, "MTD erase error on %s: %s\n", 862 DEVNAME (dev), 863 strerror (errno)); 864 return -1; 865 } 866 867 if (lseek (fd, blockstart, SEEK_SET) == -1) { 868 fprintf (stderr, 869 "Seek error on %s: %s\n", 870 DEVNAME (dev), strerror (errno)); 871 return -1; 872 } 873 874 #ifdef DEBUG 875 printf ("Write 0x%x bytes at 0x%llx\n", erasesize, blockstart); 876 #endif 877 if (write (fd, data + processed, erasesize) != erasesize) { 878 fprintf (stderr, "Write error on %s: %s\n", 879 DEVNAME (dev), strerror (errno)); 880 return -1; 881 } 882 883 ioctl (fd, MEMLOCK, &erase); 884 885 processed += blocklen; 886 block_seek = 0; 887 blockstart += blocklen; 888 } 889 890 if (write_total > count) 891 free (data); 892 893 return processed; 894 } 895 896 /* 897 * Set obsolete flag at offset - NOR flash only 898 */ 899 static int flash_flag_obsolete (int dev, int fd, off_t offset) 900 { 901 int rc; 902 struct erase_info_user erase; 903 904 erase.start = DEVOFFSET (dev); 905 erase.length = DEVESIZE (dev); 906 /* This relies on the fact, that obsolete_flag == 0 */ 907 rc = lseek (fd, offset, SEEK_SET); 908 if (rc < 0) { 909 fprintf (stderr, "Cannot seek to set the flag on %s \n", 910 DEVNAME (dev)); 911 return rc; 912 } 913 ioctl (fd, MEMUNLOCK, &erase); 914 rc = write (fd, &obsolete_flag, sizeof (obsolete_flag)); 915 ioctl (fd, MEMLOCK, &erase); 916 if (rc < 0) 917 perror ("Could not set obsolete flag"); 918 919 return rc; 920 } 921 922 static int flash_write (int fd_current, int fd_target, int dev_target) 923 { 924 int rc; 925 926 switch (environment.flag_scheme) { 927 case FLAG_NONE: 928 break; 929 case FLAG_INCREMENTAL: 930 (*environment.flags)++; 931 break; 932 case FLAG_BOOLEAN: 933 *environment.flags = active_flag; 934 break; 935 default: 936 fprintf (stderr, "Unimplemented flash scheme %u \n", 937 environment.flag_scheme); 938 return -1; 939 } 940 941 #ifdef DEBUG 942 printf ("Writing new environment at 0x%lx on %s\n", 943 DEVOFFSET (dev_target), DEVNAME (dev_target)); 944 #endif 945 rc = flash_write_buf (dev_target, fd_target, environment.image, 946 CONFIG_ENV_SIZE, DEVOFFSET (dev_target), 947 DEVTYPE(dev_target)); 948 if (rc < 0) 949 return rc; 950 951 if (environment.flag_scheme == FLAG_BOOLEAN) { 952 /* Have to set obsolete flag */ 953 off_t offset = DEVOFFSET (dev_current) + 954 offsetof (struct env_image_redundant, flags); 955 #ifdef DEBUG 956 printf ("Setting obsolete flag in environment at 0x%lx on %s\n", 957 DEVOFFSET (dev_current), DEVNAME (dev_current)); 958 #endif 959 flash_flag_obsolete (dev_current, fd_current, offset); 960 } 961 962 return 0; 963 } 964 965 static int flash_read (int fd) 966 { 967 struct mtd_info_user mtdinfo; 968 int rc; 969 970 rc = ioctl (fd, MEMGETINFO, &mtdinfo); 971 if (rc < 0) { 972 perror ("Cannot get MTD information"); 973 return -1; 974 } 975 976 if (mtdinfo.type != MTD_NORFLASH && mtdinfo.type != MTD_NANDFLASH) { 977 fprintf (stderr, "Unsupported flash type %u\n", mtdinfo.type); 978 return -1; 979 } 980 981 DEVTYPE(dev_current) = mtdinfo.type; 982 983 rc = flash_read_buf (dev_current, fd, environment.image, CONFIG_ENV_SIZE, 984 DEVOFFSET (dev_current), mtdinfo.type); 985 986 return (rc != CONFIG_ENV_SIZE) ? -1 : 0; 987 } 988 989 static int flash_io (int mode) 990 { 991 int fd_current, fd_target, rc, dev_target; 992 993 /* dev_current: fd_current, erase_current */ 994 fd_current = open (DEVNAME (dev_current), mode); 995 if (fd_current < 0) { 996 fprintf (stderr, 997 "Can't open %s: %s\n", 998 DEVNAME (dev_current), strerror (errno)); 999 return -1; 1000 } 1001 1002 if (mode == O_RDWR) { 1003 if (HaveRedundEnv) { 1004 /* switch to next partition for writing */ 1005 dev_target = !dev_current; 1006 /* dev_target: fd_target, erase_target */ 1007 fd_target = open (DEVNAME (dev_target), mode); 1008 if (fd_target < 0) { 1009 fprintf (stderr, 1010 "Can't open %s: %s\n", 1011 DEVNAME (dev_target), 1012 strerror (errno)); 1013 rc = -1; 1014 goto exit; 1015 } 1016 } else { 1017 dev_target = dev_current; 1018 fd_target = fd_current; 1019 } 1020 1021 rc = flash_write (fd_current, fd_target, dev_target); 1022 1023 if (HaveRedundEnv) { 1024 if (close (fd_target)) { 1025 fprintf (stderr, 1026 "I/O error on %s: %s\n", 1027 DEVNAME (dev_target), 1028 strerror (errno)); 1029 rc = -1; 1030 } 1031 } 1032 } else { 1033 rc = flash_read (fd_current); 1034 } 1035 1036 exit: 1037 if (close (fd_current)) { 1038 fprintf (stderr, 1039 "I/O error on %s: %s\n", 1040 DEVNAME (dev_current), strerror (errno)); 1041 return -1; 1042 } 1043 1044 return rc; 1045 } 1046 1047 /* 1048 * s1 is either a simple 'name', or a 'name=value' pair. 1049 * s2 is a 'name=value' pair. 1050 * If the names match, return the value of s2, else NULL. 1051 */ 1052 1053 static char *envmatch (char * s1, char * s2) 1054 { 1055 1056 while (*s1 == *s2++) 1057 if (*s1++ == '=') 1058 return s2; 1059 if (*s1 == '\0' && *(s2 - 1) == '=') 1060 return s2; 1061 return NULL; 1062 } 1063 1064 /* 1065 * Prevent confusion if running from erased flash memory 1066 */ 1067 int fw_env_open(void) 1068 { 1069 int crc0, crc0_ok; 1070 char flag0; 1071 void *addr0; 1072 1073 int crc1, crc1_ok; 1074 char flag1; 1075 void *addr1; 1076 1077 struct env_image_single *single; 1078 struct env_image_redundant *redundant; 1079 1080 if (parse_config ()) /* should fill envdevices */ 1081 return -1; 1082 1083 addr0 = calloc (1, CONFIG_ENV_SIZE); 1084 if (addr0 == NULL) { 1085 fprintf (stderr, 1086 "Not enough memory for environment (%ld bytes)\n", 1087 CONFIG_ENV_SIZE); 1088 return -1; 1089 } 1090 1091 /* read environment from FLASH to local buffer */ 1092 environment.image = addr0; 1093 1094 if (HaveRedundEnv) { 1095 redundant = addr0; 1096 environment.crc = &redundant->crc; 1097 environment.flags = &redundant->flags; 1098 environment.data = redundant->data; 1099 } else { 1100 single = addr0; 1101 environment.crc = &single->crc; 1102 environment.flags = NULL; 1103 environment.data = single->data; 1104 } 1105 1106 dev_current = 0; 1107 if (flash_io (O_RDONLY)) 1108 return -1; 1109 1110 crc0 = crc32 (0, (uint8_t *) environment.data, ENV_SIZE); 1111 crc0_ok = (crc0 == *environment.crc); 1112 if (!HaveRedundEnv) { 1113 if (!crc0_ok) { 1114 fprintf (stderr, 1115 "Warning: Bad CRC, using default environment\n"); 1116 memcpy(environment.data, default_environment, sizeof default_environment); 1117 } 1118 } else { 1119 flag0 = *environment.flags; 1120 1121 dev_current = 1; 1122 addr1 = calloc (1, CONFIG_ENV_SIZE); 1123 if (addr1 == NULL) { 1124 fprintf (stderr, 1125 "Not enough memory for environment (%ld bytes)\n", 1126 CONFIG_ENV_SIZE); 1127 return -1; 1128 } 1129 redundant = addr1; 1130 1131 /* 1132 * have to set environment.image for flash_read(), careful - 1133 * other pointers in environment still point inside addr0 1134 */ 1135 environment.image = addr1; 1136 if (flash_io (O_RDONLY)) 1137 return -1; 1138 1139 /* Check flag scheme compatibility */ 1140 if (DEVTYPE(dev_current) == MTD_NORFLASH && 1141 DEVTYPE(!dev_current) == MTD_NORFLASH) { 1142 environment.flag_scheme = FLAG_BOOLEAN; 1143 } else if (DEVTYPE(dev_current) == MTD_NANDFLASH && 1144 DEVTYPE(!dev_current) == MTD_NANDFLASH) { 1145 environment.flag_scheme = FLAG_INCREMENTAL; 1146 } else { 1147 fprintf (stderr, "Incompatible flash types!\n"); 1148 return -1; 1149 } 1150 1151 crc1 = crc32 (0, (uint8_t *) redundant->data, ENV_SIZE); 1152 crc1_ok = (crc1 == redundant->crc); 1153 flag1 = redundant->flags; 1154 1155 if (crc0_ok && !crc1_ok) { 1156 dev_current = 0; 1157 } else if (!crc0_ok && crc1_ok) { 1158 dev_current = 1; 1159 } else if (!crc0_ok && !crc1_ok) { 1160 fprintf (stderr, 1161 "Warning: Bad CRC, using default environment\n"); 1162 memcpy (environment.data, default_environment, 1163 sizeof default_environment); 1164 dev_current = 0; 1165 } else { 1166 switch (environment.flag_scheme) { 1167 case FLAG_BOOLEAN: 1168 if (flag0 == active_flag && 1169 flag1 == obsolete_flag) { 1170 dev_current = 0; 1171 } else if (flag0 == obsolete_flag && 1172 flag1 == active_flag) { 1173 dev_current = 1; 1174 } else if (flag0 == flag1) { 1175 dev_current = 0; 1176 } else if (flag0 == 0xFF) { 1177 dev_current = 0; 1178 } else if (flag1 == 0xFF) { 1179 dev_current = 1; 1180 } else { 1181 dev_current = 0; 1182 } 1183 break; 1184 case FLAG_INCREMENTAL: 1185 if ((flag0 == 255 && flag1 == 0) || 1186 flag1 > flag0) 1187 dev_current = 1; 1188 else if ((flag1 == 255 && flag0 == 0) || 1189 flag0 > flag1) 1190 dev_current = 0; 1191 else /* flags are equal - almost impossible */ 1192 dev_current = 0; 1193 break; 1194 default: 1195 fprintf (stderr, "Unknown flag scheme %u \n", 1196 environment.flag_scheme); 1197 return -1; 1198 } 1199 } 1200 1201 /* 1202 * If we are reading, we don't need the flag and the CRC any 1203 * more, if we are writing, we will re-calculate CRC and update 1204 * flags before writing out 1205 */ 1206 if (dev_current) { 1207 environment.image = addr1; 1208 environment.crc = &redundant->crc; 1209 environment.flags = &redundant->flags; 1210 environment.data = redundant->data; 1211 free (addr0); 1212 } else { 1213 environment.image = addr0; 1214 /* Other pointers are already set */ 1215 free (addr1); 1216 } 1217 } 1218 return 0; 1219 } 1220 1221 1222 static int parse_config () 1223 { 1224 struct stat st; 1225 1226 #if defined(CONFIG_FILE) 1227 /* Fills in DEVNAME(), ENVSIZE(), DEVESIZE(). Or don't. */ 1228 if (get_config (CONFIG_FILE)) { 1229 fprintf (stderr, 1230 "Cannot parse config file: %s\n", strerror (errno)); 1231 return -1; 1232 } 1233 #else 1234 strcpy (DEVNAME (0), DEVICE1_NAME); 1235 DEVOFFSET (0) = DEVICE1_OFFSET; 1236 ENVSIZE (0) = ENV1_SIZE; 1237 DEVESIZE (0) = DEVICE1_ESIZE; 1238 ENVSECTORS (0) = DEVICE1_ENVSECTORS; 1239 #ifdef HAVE_REDUND 1240 strcpy (DEVNAME (1), DEVICE2_NAME); 1241 DEVOFFSET (1) = DEVICE2_OFFSET; 1242 ENVSIZE (1) = ENV2_SIZE; 1243 DEVESIZE (1) = DEVICE2_ESIZE; 1244 ENVSECTORS (1) = DEVICE2_ENVSECTORS; 1245 HaveRedundEnv = 1; 1246 #endif 1247 #endif 1248 if (stat (DEVNAME (0), &st)) { 1249 fprintf (stderr, 1250 "Cannot access MTD device %s: %s\n", 1251 DEVNAME (0), strerror (errno)); 1252 return -1; 1253 } 1254 1255 if (HaveRedundEnv && stat (DEVNAME (1), &st)) { 1256 fprintf (stderr, 1257 "Cannot access MTD device %s: %s\n", 1258 DEVNAME (1), strerror (errno)); 1259 return -1; 1260 } 1261 return 0; 1262 } 1263 1264 #if defined(CONFIG_FILE) 1265 static int get_config (char *fname) 1266 { 1267 FILE *fp; 1268 int i = 0; 1269 int rc; 1270 char dump[128]; 1271 1272 fp = fopen (fname, "r"); 1273 if (fp == NULL) 1274 return -1; 1275 1276 while (i < 2 && fgets (dump, sizeof (dump), fp)) { 1277 /* Skip incomplete conversions and comment strings */ 1278 if (dump[0] == '#') 1279 continue; 1280 1281 rc = sscanf (dump, "%s %lx %lx %lx %lx", 1282 DEVNAME (i), 1283 &DEVOFFSET (i), 1284 &ENVSIZE (i), 1285 &DEVESIZE (i), 1286 &ENVSECTORS (i)); 1287 1288 if (rc < 4) 1289 continue; 1290 1291 if (rc < 5) 1292 /* Default - 1 sector */ 1293 ENVSECTORS (i) = 1; 1294 1295 i++; 1296 } 1297 fclose (fp); 1298 1299 HaveRedundEnv = i - 1; 1300 if (!i) { /* No valid entries found */ 1301 errno = EINVAL; 1302 return -1; 1303 } else 1304 return 0; 1305 } 1306 #endif 1307