2 * (C) Copyright 2000-2010
3 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
6 * Guennadi Liakhovetski, DENX Software Engineering, lg@denx.de.
8 * SPDX-License-Identifier: GPL-2.0+
14 #include <env_flags.h>
16 #include <linux/stringify.h>
21 #include <sys/types.h>
22 #include <sys/ioctl.h>
28 # include <linux/mtd/mtd.h>
30 # define __user /* nothing */
31 # include <mtd/mtd-user.h>
38 #define DIV_ROUND_UP(n, d) (((n) + (d) - 1) / (d))
40 #define WHITESPACE(c) ((c == '\t') || (c == ' '))
42 #define min(x, y) ({ \
43 typeof(x) _min1 = (x); \
44 typeof(y) _min2 = (y); \
45 (void) (&_min1 == &_min2); \
46 _min1 < _min2 ? _min1 : _min2; })
49 const char *devname; /* Device name */
50 ulong devoff; /* Device offset */
51 ulong env_size; /* environment size */
52 ulong erase_size; /* device erase size */
53 ulong env_sectors; /* number of environment sectors */
54 uint8_t mtd_type; /* type of the MTD device */
57 static struct envdev_s envdevices[2] =
60 .mtd_type = MTD_ABSENT,
62 .mtd_type = MTD_ABSENT,
65 static int dev_current;
67 #define DEVNAME(i) envdevices[(i)].devname
68 #define DEVOFFSET(i) envdevices[(i)].devoff
69 #define ENVSIZE(i) envdevices[(i)].env_size
70 #define DEVESIZE(i) envdevices[(i)].erase_size
71 #define ENVSECTORS(i) envdevices[(i)].env_sectors
72 #define DEVTYPE(i) envdevices[(i)].mtd_type
74 #define CUR_ENVSIZE ENVSIZE(dev_current)
76 #define ENV_SIZE getenvsize()
78 struct env_image_single {
79 uint32_t crc; /* CRC32 over data bytes */
83 struct env_image_redundant {
84 uint32_t crc; /* CRC32 over data bytes */
85 unsigned char flags; /* active or obsolete */
100 enum flag_scheme flag_scheme;
103 static struct environment environment = {
104 .flag_scheme = FLAG_NONE,
107 /* Is AES encryption used? */
109 static uint8_t aes_key[AES_KEY_LENGTH] = { 0 };
110 static int env_aes_cbc_crypt(char *data, const int enc);
112 static int HaveRedundEnv = 0;
114 static unsigned char active_flag = 1;
115 /* obsolete_flag must be 0 to efficiently set it on NOR flash without erasing */
116 static unsigned char obsolete_flag = 0;
118 #define DEFAULT_ENV_INSTANCE_STATIC
119 #include <env_default.h>
121 static int flash_io (int mode);
122 static char *envmatch (char * s1, char * s2);
123 static int parse_config (void);
125 #if defined(CONFIG_FILE)
126 static int get_config (char *);
128 static inline ulong getenvsize (void)
130 ulong rc = CUR_ENVSIZE - sizeof(uint32_t);
136 rc &= ~(AES_KEY_LENGTH - 1);
141 static char *fw_string_blank(char *s, int noblank)
146 for (i = 0; i < len; i++, s++) {
147 if ((noblank && !WHITESPACE(*s)) ||
148 (!noblank && WHITESPACE(*s)))
158 * Search the environment for a variable.
159 * Return the value, if found, or NULL, if not found.
161 char *fw_getenv (char *name)
165 for (env = environment.data; *env; env = nxt + 1) {
168 for (nxt = env; *nxt; ++nxt) {
169 if (nxt >= &environment.data[ENV_SIZE]) {
170 fprintf (stderr, "## Error: "
171 "environment not terminated\n");
175 val = envmatch (name, env);
184 * Search the default environment for a variable.
185 * Return the value, if found, or NULL, if not found.
187 char *fw_getdefenv(char *name)
191 for (env = default_environment; *env; env = nxt + 1) {
194 for (nxt = env; *nxt; ++nxt) {
195 if (nxt >= &default_environment[ENV_SIZE]) {
196 fprintf(stderr, "## Error: "
197 "default environment not terminated\n");
201 val = envmatch(name, env);
209 static int parse_aes_key(char *key)
211 char tmp[5] = { '0', 'x', 0, 0, 0 };
215 if (strnlen(key, 64) != 32) {
217 "## Error: '-a' option requires 16-byte AES key\n");
221 for (i = 0; i < 16; i++) {
225 ul = strtoul(tmp, NULL, 16);
228 "## Error: '-a' option requires valid AES key\n");
231 aes_key[i] = ul & 0xff;
240 * Print the current definition of one, or more, or all
241 * environment variables
243 int fw_printenv (int argc, char *argv[])
249 if (argc >= 2 && strcmp(argv[1], "-a") == 0) {
252 "## Error: '-a' option requires AES key\n");
255 rc = parse_aes_key(argv[2]);
265 if (argc == 1) { /* Print all env variables */
266 for (env = environment.data; *env; env = nxt + 1) {
267 for (nxt = env; *nxt; ++nxt) {
268 if (nxt >= &environment.data[ENV_SIZE]) {
269 fprintf (stderr, "## Error: "
270 "environment not terminated\n");
275 printf ("%s\n", env);
280 if (strcmp (argv[1], "-n") == 0) {
285 fprintf (stderr, "## Error: "
286 "`-n' option requires exactly one argument\n");
293 for (i = 1; i < argc; ++i) { /* print single env variables */
294 char *name = argv[i];
297 for (env = environment.data; *env; env = nxt + 1) {
299 for (nxt = env; *nxt; ++nxt) {
300 if (nxt >= &environment.data[ENV_SIZE]) {
301 fprintf (stderr, "## Error: "
302 "environment not terminated\n");
306 val = envmatch (name, env);
309 fputs (name, stdout);
317 fprintf (stderr, "## Error: \"%s\" not defined\n", name);
325 int fw_env_close(void)
329 ret = env_aes_cbc_crypt(environment.data, 1);
332 "Error: can't encrypt env for flash\n");
340 *environment.crc = crc32(0, (uint8_t *) environment.data, ENV_SIZE);
342 /* write environment back to flash */
343 if (flash_io(O_RDWR)) {
345 "Error: can't write fw_env to flash\n");
354 * Set/Clear a single variable in the environment.
355 * This is called in sequence to update the environment
356 * in RAM without updating the copy in flash after each set
358 int fw_env_write(char *name, char *value)
363 int deleting, creating, overwriting;
366 * search if variable with this name already exists
368 for (nxt = env = environment.data; *env; env = nxt + 1) {
369 for (nxt = env; *nxt; ++nxt) {
370 if (nxt >= &environment.data[ENV_SIZE]) {
371 fprintf(stderr, "## Error: "
372 "environment not terminated\n");
377 if ((oldval = envmatch (name, env)) != NULL)
381 deleting = (oldval && !(value && strlen(value)));
382 creating = (!oldval && (value && strlen(value)));
383 overwriting = (oldval && (value && strlen(value)));
385 /* check for permission */
387 if (env_flags_validate_varaccess(name,
388 ENV_FLAGS_VARACCESS_PREVENT_DELETE)) {
389 printf("Can't delete \"%s\"\n", name);
393 } else if (overwriting) {
394 if (env_flags_validate_varaccess(name,
395 ENV_FLAGS_VARACCESS_PREVENT_OVERWR)) {
396 printf("Can't overwrite \"%s\"\n", name);
399 } else if (env_flags_validate_varaccess(name,
400 ENV_FLAGS_VARACCESS_PREVENT_NONDEF_OVERWR)) {
401 const char *defval = fw_getdefenv(name);
405 if (strcmp(oldval, defval)
407 printf("Can't overwrite \"%s\"\n", name);
412 } else if (creating) {
413 if (env_flags_validate_varaccess(name,
414 ENV_FLAGS_VARACCESS_PREVENT_CREATE)) {
415 printf("Can't create \"%s\"\n", name);
423 if (deleting || overwriting) {
424 if (*++nxt == '\0') {
429 if ((*env == '\0') && (*nxt == '\0'))
438 if (!value || !strlen(value))
442 * Append new definition at the end
444 for (env = environment.data; *env || *(env + 1); ++env);
445 if (env > environment.data)
449 * "name" + "=" + "val" +"\0\0" > CUR_ENVSIZE - (env-environment)
451 len = strlen (name) + 2;
452 /* add '=' for first arg, ' ' for all others */
453 len += strlen(value) + 1;
455 if (len > (&environment.data[ENV_SIZE] - env)) {
457 "Error: environment overflow, \"%s\" deleted\n",
462 while ((*env = *name++) != '\0')
465 while ((*++env = *value++) != '\0')
468 /* end is marked with double '\0' */
475 * Deletes or sets environment variables. Returns -1 and sets errno error codes:
477 * EINVAL - need at least 1 argument
478 * EROFS - certain variables ("ethaddr", "serial#") cannot be
479 * modified or deleted
482 int fw_setenv(int argc, char *argv[])
494 if (strcmp(argv[1], "-a") == 0) {
497 "## Error: '-a' option requires AES key\n");
500 rc = parse_aes_key(argv[2]);
513 fprintf(stderr, "Error: environment not initialized\n");
519 if (env_flags_validate_env_set_params(argc, argv) < 0)
523 for (i = 2; i < argc; ++i) {
525 size_t val_len = strlen(val);
528 value[len - 1] = ' ';
529 value = realloc(value, len + val_len + 1);
532 "Cannot malloc %zu bytes: %s\n",
533 len, strerror(errno));
537 memcpy(value + len, val, val_len);
542 fw_env_write(name, value);
546 return fw_env_close();
550 * Parse a file and configure the u-boot variables.
551 * The script file has a very simple format, as follows:
553 * Each line has a couple with name, value:
554 * <white spaces>variable_name<white spaces>variable_value
556 * Both variable_name and variable_value are interpreted as strings.
557 * Any character after <white spaces> and before ending \r\n is interpreted
558 * as variable's value (no comment allowed on these lines !)
560 * Comments are allowed if the first character in the line is #
562 * Returns -1 and sets errno error codes:
566 int fw_parse_script(char *fname)
569 char dump[1024]; /* Maximum line length in the file */
577 fprintf(stderr, "Error: environment not initialized\n");
581 if (strcmp(fname, "-") == 0)
584 fp = fopen(fname, "r");
586 fprintf(stderr, "I cannot open %s for reading\n",
592 while (fgets(dump, sizeof(dump), fp)) {
597 * Read a whole line from the file. If the line is too long
598 * or is not terminated, reports an error and exit.
600 if (dump[len - 1] != '\n') {
602 "Line %d not corrected terminated or too long\n",
608 /* Drop ending line feed / carriage return */
609 while (len > 0 && (dump[len - 1] == '\n' ||
610 dump[len - 1] == '\r')) {
611 dump[len - 1] = '\0';
615 /* Skip comment or empty lines */
616 if ((len == 0) || dump[0] == '#')
620 * Search for variable's name,
621 * remove leading whitespaces
623 name = fw_string_blank(dump, 1);
627 /* The first white space is the end of variable name */
628 val = fw_string_blank(name, 0);
632 if ((val - name) < len)
633 val = fw_string_blank(val, 1);
639 fprintf(stderr, "Setting %s : %s\n",
640 name, val ? val : " removed");
643 if (env_flags_validate_type(name, val) < 0) {
649 * If there is an error setting a variable,
650 * try to save the environment and returns an error
652 if (fw_env_write(name, val)) {
654 "fw_env_write returns with error : %s\n",
662 /* Close file if not stdin */
663 if (strcmp(fname, "-") != 0)
666 ret |= fw_env_close();
673 * Test for bad block on NAND, just returns 0 on NOR, on NAND:
676 * < 0 - failed to test
678 static int flash_bad_block (int fd, uint8_t mtd_type, loff_t *blockstart)
680 if (mtd_type == MTD_NANDFLASH) {
681 int badblock = ioctl (fd, MEMGETBADBLOCK, blockstart);
684 perror ("Cannot read bad block mark");
690 fprintf (stderr, "Bad block at 0x%llx, "
691 "skipping\n", *blockstart);
701 * Read data from flash at an offset into a provided buffer. On NAND it skips
702 * bad blocks but makes sure it stays within ENVSECTORS (dev) starting from
703 * the DEVOFFSET (dev) block. On NOR the loop is only run once.
705 static int flash_read_buf (int dev, int fd, void *buf, size_t count,
706 off_t offset, uint8_t mtd_type)
708 size_t blocklen; /* erase / write length - one block on NAND,
710 size_t processed = 0; /* progress counter */
711 size_t readlen = count; /* current read length */
712 off_t top_of_range; /* end of the last block we may use */
713 off_t block_seek; /* offset inside the current block to the start
715 loff_t blockstart; /* running start of the current block -
716 MEMGETBADBLOCK needs 64 bits */
719 blockstart = (offset / DEVESIZE (dev)) * DEVESIZE (dev);
721 /* Offset inside a block */
722 block_seek = offset - blockstart;
724 if (mtd_type == MTD_NANDFLASH) {
726 * NAND: calculate which blocks we are reading. We have
727 * to read one block at a time to skip bad blocks.
729 blocklen = DEVESIZE (dev);
732 * To calculate the top of the range, we have to use the
733 * global DEVOFFSET (dev), which can be different from offset
735 top_of_range = ((DEVOFFSET(dev) / blocklen) +
736 ENVSECTORS (dev)) * blocklen;
738 /* Limit to one block for the first read */
739 if (readlen > blocklen - block_seek)
740 readlen = blocklen - block_seek;
743 top_of_range = offset + count;
746 /* This only runs once on NOR flash */
747 while (processed < count) {
748 rc = flash_bad_block (fd, mtd_type, &blockstart);
749 if (rc < 0) /* block test failed */
752 if (blockstart + block_seek + readlen > top_of_range) {
753 /* End of range is reached */
755 "Too few good blocks within range\n");
759 if (rc) { /* block is bad */
760 blockstart += blocklen;
765 * If a block is bad, we retry in the next block at the same
766 * offset - see common/env_nand.c::writeenv()
768 lseek (fd, blockstart + block_seek, SEEK_SET);
770 rc = read (fd, buf + processed, readlen);
772 fprintf (stderr, "Read error on %s: %s\n",
773 DEVNAME (dev), strerror (errno));
777 fprintf(stderr, "Read 0x%x bytes at 0x%llx on %s\n",
778 rc, blockstart + block_seek, DEVNAME(dev));
780 processed += readlen;
781 readlen = min (blocklen, count - processed);
783 blockstart += blocklen;
790 * Write count bytes at offset, but stay within ENVSECTORS (dev) sectors of
791 * DEVOFFSET (dev). Similar to the read case above, on NOR and dataflash we
792 * erase and write the whole data at once.
794 static int flash_write_buf (int dev, int fd, void *buf, size_t count,
795 off_t offset, uint8_t mtd_type)
798 struct erase_info_user erase;
799 size_t blocklen; /* length of NAND block / NOR erase sector */
800 size_t erase_len; /* whole area that can be erased - may include
802 size_t erasesize; /* erase / write length - one block on NAND,
804 size_t processed = 0; /* progress counter */
805 size_t write_total; /* total size to actually write - excluding
807 off_t erase_offset; /* offset to the first erase block (aligned)
809 off_t block_seek; /* offset inside the erase block to the start
811 off_t top_of_range; /* end of the last block we may use */
812 loff_t blockstart; /* running start of the current block -
813 MEMGETBADBLOCK needs 64 bits */
817 * For mtd devices only offset and size of the environment do matter
819 if (mtd_type == MTD_ABSENT) {
821 top_of_range = offset + count;
822 erase_len = blocklen;
825 write_total = blocklen;
827 blocklen = DEVESIZE(dev);
829 top_of_range = ((DEVOFFSET(dev) / blocklen) +
830 ENVSECTORS(dev)) * blocklen;
832 erase_offset = (offset / blocklen) * blocklen;
834 /* Maximum area we may use */
835 erase_len = top_of_range - erase_offset;
837 blockstart = erase_offset;
838 /* Offset inside a block */
839 block_seek = offset - erase_offset;
842 * Data size we actually write: from the start of the block
843 * to the start of the data, then count bytes of data, and
844 * to the end of the block
846 write_total = ((block_seek + count + blocklen - 1) /
847 blocklen) * blocklen;
851 * Support data anywhere within erase sectors: read out the complete
852 * area to be erased, replace the environment image, write the whole
855 if (write_total > count) {
856 data = malloc (erase_len);
859 "Cannot malloc %zu bytes: %s\n",
860 erase_len, strerror (errno));
864 rc = flash_read_buf (dev, fd, data, write_total, erase_offset,
866 if (write_total != rc)
870 fprintf(stderr, "Preserving data ");
872 fprintf(stderr, "0x%x - 0x%lx", 0, block_seek - 1);
873 if (block_seek + count != write_total) {
875 fprintf(stderr, " and ");
876 fprintf(stderr, "0x%lx - 0x%x",
877 block_seek + count, write_total - 1);
879 fprintf(stderr, "\n");
881 /* Overwrite the old environment */
882 memcpy (data + block_seek, buf, count);
885 * We get here, iff offset is block-aligned and count is a
886 * multiple of blocklen - see write_total calculation above
891 if (mtd_type == MTD_NANDFLASH) {
893 * NAND: calculate which blocks we are writing. We have
894 * to write one block at a time to skip bad blocks.
896 erasesize = blocklen;
898 erasesize = erase_len;
901 erase.length = erasesize;
903 /* This only runs once on NOR flash and SPI-dataflash */
904 while (processed < write_total) {
905 rc = flash_bad_block (fd, mtd_type, &blockstart);
906 if (rc < 0) /* block test failed */
909 if (blockstart + erasesize > top_of_range) {
910 fprintf (stderr, "End of range reached, aborting\n");
914 if (rc) { /* block is bad */
915 blockstart += blocklen;
919 if (mtd_type != MTD_ABSENT) {
920 erase.start = blockstart;
921 ioctl(fd, MEMUNLOCK, &erase);
922 /* These do not need an explicit erase cycle */
923 if (mtd_type != MTD_DATAFLASH)
924 if (ioctl(fd, MEMERASE, &erase) != 0) {
926 "MTD erase error on %s: %s\n",
927 DEVNAME(dev), strerror(errno));
932 if (lseek (fd, blockstart, SEEK_SET) == -1) {
934 "Seek error on %s: %s\n",
935 DEVNAME (dev), strerror (errno));
940 fprintf(stderr, "Write 0x%x bytes at 0x%llx\n", erasesize,
943 if (write (fd, data + processed, erasesize) != erasesize) {
944 fprintf (stderr, "Write error on %s: %s\n",
945 DEVNAME (dev), strerror (errno));
949 if (mtd_type != MTD_ABSENT)
950 ioctl(fd, MEMLOCK, &erase);
952 processed += erasesize;
954 blockstart += erasesize;
957 if (write_total > count)
964 * Set obsolete flag at offset - NOR flash only
966 static int flash_flag_obsolete (int dev, int fd, off_t offset)
969 struct erase_info_user erase;
971 erase.start = DEVOFFSET (dev);
972 erase.length = DEVESIZE (dev);
973 /* This relies on the fact, that obsolete_flag == 0 */
974 rc = lseek (fd, offset, SEEK_SET);
976 fprintf (stderr, "Cannot seek to set the flag on %s \n",
980 ioctl (fd, MEMUNLOCK, &erase);
981 rc = write (fd, &obsolete_flag, sizeof (obsolete_flag));
982 ioctl (fd, MEMLOCK, &erase);
984 perror ("Could not set obsolete flag");
989 /* Encrypt or decrypt the environment before writing or reading it. */
990 static int env_aes_cbc_crypt(char *payload, const int enc)
992 uint8_t *data = (uint8_t *)payload;
993 const int len = getenvsize();
994 uint8_t key_exp[AES_EXPAND_KEY_LENGTH];
997 /* First we expand the key. */
998 aes_expand_key(aes_key, key_exp);
1000 /* Calculate the number of AES blocks to encrypt. */
1001 aes_blocks = DIV_ROUND_UP(len, AES_KEY_LENGTH);
1004 aes_cbc_encrypt_blocks(key_exp, data, data, aes_blocks);
1006 aes_cbc_decrypt_blocks(key_exp, data, data, aes_blocks);
1011 static int flash_write (int fd_current, int fd_target, int dev_target)
1015 switch (environment.flag_scheme) {
1018 case FLAG_INCREMENTAL:
1019 (*environment.flags)++;
1022 *environment.flags = active_flag;
1025 fprintf (stderr, "Unimplemented flash scheme %u \n",
1026 environment.flag_scheme);
1031 fprintf(stderr, "Writing new environment at 0x%lx on %s\n",
1032 DEVOFFSET (dev_target), DEVNAME (dev_target));
1035 rc = flash_write_buf(dev_target, fd_target, environment.image,
1036 CUR_ENVSIZE, DEVOFFSET(dev_target),
1037 DEVTYPE(dev_target));
1041 if (environment.flag_scheme == FLAG_BOOLEAN) {
1042 /* Have to set obsolete flag */
1043 off_t offset = DEVOFFSET (dev_current) +
1044 offsetof (struct env_image_redundant, flags);
1047 "Setting obsolete flag in environment at 0x%lx on %s\n",
1048 DEVOFFSET (dev_current), DEVNAME (dev_current));
1050 flash_flag_obsolete (dev_current, fd_current, offset);
1056 static int flash_read (int fd)
1058 struct mtd_info_user mtdinfo;
1062 rc = fstat(fd, &st);
1064 fprintf(stderr, "Cannot stat the file %s\n",
1065 DEVNAME(dev_current));
1069 if (S_ISCHR(st.st_mode)) {
1070 rc = ioctl(fd, MEMGETINFO, &mtdinfo);
1072 fprintf(stderr, "Cannot get MTD information for %s\n",
1073 DEVNAME(dev_current));
1076 if (mtdinfo.type != MTD_NORFLASH &&
1077 mtdinfo.type != MTD_NANDFLASH &&
1078 mtdinfo.type != MTD_DATAFLASH &&
1079 mtdinfo.type != MTD_UBIVOLUME) {
1080 fprintf (stderr, "Unsupported flash type %u on %s\n",
1081 mtdinfo.type, DEVNAME(dev_current));
1085 memset(&mtdinfo, 0, sizeof(mtdinfo));
1086 mtdinfo.type = MTD_ABSENT;
1089 DEVTYPE(dev_current) = mtdinfo.type;
1091 rc = flash_read_buf(dev_current, fd, environment.image, CUR_ENVSIZE,
1092 DEVOFFSET (dev_current), mtdinfo.type);
1093 if (rc != CUR_ENVSIZE)
1099 static int flash_io (int mode)
1101 int fd_current, fd_target, rc, dev_target;
1103 /* dev_current: fd_current, erase_current */
1104 fd_current = open (DEVNAME (dev_current), mode);
1105 if (fd_current < 0) {
1107 "Can't open %s: %s\n",
1108 DEVNAME (dev_current), strerror (errno));
1112 if (mode == O_RDWR) {
1113 if (HaveRedundEnv) {
1114 /* switch to next partition for writing */
1115 dev_target = !dev_current;
1116 /* dev_target: fd_target, erase_target */
1117 fd_target = open (DEVNAME (dev_target), mode);
1118 if (fd_target < 0) {
1120 "Can't open %s: %s\n",
1121 DEVNAME (dev_target),
1127 dev_target = dev_current;
1128 fd_target = fd_current;
1131 rc = flash_write (fd_current, fd_target, dev_target);
1133 if (HaveRedundEnv) {
1134 if (close (fd_target)) {
1136 "I/O error on %s: %s\n",
1137 DEVNAME (dev_target),
1143 rc = flash_read (fd_current);
1147 if (close (fd_current)) {
1149 "I/O error on %s: %s\n",
1150 DEVNAME (dev_current), strerror (errno));
1158 * s1 is either a simple 'name', or a 'name=value' pair.
1159 * s2 is a 'name=value' pair.
1160 * If the names match, return the value of s2, else NULL.
1163 static char *envmatch (char * s1, char * s2)
1165 if (s1 == NULL || s2 == NULL)
1168 while (*s1 == *s2++)
1171 if (*s1 == '\0' && *(s2 - 1) == '=')
1177 * Prevent confusion if running from erased flash memory
1179 int fw_env_open(void)
1182 unsigned char flag0;
1186 unsigned char flag1;
1191 struct env_image_single *single;
1192 struct env_image_redundant *redundant;
1194 if (parse_config ()) /* should fill envdevices */
1197 addr0 = calloc(1, CUR_ENVSIZE);
1198 if (addr0 == NULL) {
1200 "Not enough memory for environment (%ld bytes)\n",
1205 /* read environment from FLASH to local buffer */
1206 environment.image = addr0;
1208 if (HaveRedundEnv) {
1210 environment.crc = &redundant->crc;
1211 environment.flags = &redundant->flags;
1212 environment.data = redundant->data;
1215 environment.crc = &single->crc;
1216 environment.flags = NULL;
1217 environment.data = single->data;
1221 if (flash_io (O_RDONLY))
1224 crc0 = crc32 (0, (uint8_t *) environment.data, ENV_SIZE);
1227 ret = env_aes_cbc_crypt(environment.data, 0);
1232 crc0_ok = (crc0 == *environment.crc);
1233 if (!HaveRedundEnv) {
1236 "Warning: Bad CRC, using default environment\n");
1237 memcpy(environment.data, default_environment, sizeof default_environment);
1240 flag0 = *environment.flags;
1243 addr1 = calloc(1, CUR_ENVSIZE);
1244 if (addr1 == NULL) {
1246 "Not enough memory for environment (%ld bytes)\n",
1253 * have to set environment.image for flash_read(), careful -
1254 * other pointers in environment still point inside addr0
1256 environment.image = addr1;
1257 if (flash_io (O_RDONLY))
1260 /* Check flag scheme compatibility */
1261 if (DEVTYPE(dev_current) == MTD_NORFLASH &&
1262 DEVTYPE(!dev_current) == MTD_NORFLASH) {
1263 environment.flag_scheme = FLAG_BOOLEAN;
1264 } else if (DEVTYPE(dev_current) == MTD_NANDFLASH &&
1265 DEVTYPE(!dev_current) == MTD_NANDFLASH) {
1266 environment.flag_scheme = FLAG_INCREMENTAL;
1267 } else if (DEVTYPE(dev_current) == MTD_DATAFLASH &&
1268 DEVTYPE(!dev_current) == MTD_DATAFLASH) {
1269 environment.flag_scheme = FLAG_BOOLEAN;
1270 } else if (DEVTYPE(dev_current) == MTD_UBIVOLUME &&
1271 DEVTYPE(!dev_current) == MTD_UBIVOLUME) {
1272 environment.flag_scheme = FLAG_INCREMENTAL;
1273 } else if (DEVTYPE(dev_current) == MTD_ABSENT &&
1274 DEVTYPE(!dev_current) == MTD_ABSENT) {
1275 environment.flag_scheme = FLAG_INCREMENTAL;
1277 fprintf (stderr, "Incompatible flash types!\n");
1281 crc1 = crc32 (0, (uint8_t *) redundant->data, ENV_SIZE);
1284 ret = env_aes_cbc_crypt(redundant->data, 0);
1289 crc1_ok = (crc1 == redundant->crc);
1290 flag1 = redundant->flags;
1292 if (crc0_ok && !crc1_ok) {
1294 } else if (!crc0_ok && crc1_ok) {
1296 } else if (!crc0_ok && !crc1_ok) {
1298 "Warning: Bad CRC, using default environment\n");
1299 memcpy (environment.data, default_environment,
1300 sizeof default_environment);
1303 switch (environment.flag_scheme) {
1305 if (flag0 == active_flag &&
1306 flag1 == obsolete_flag) {
1308 } else if (flag0 == obsolete_flag &&
1309 flag1 == active_flag) {
1311 } else if (flag0 == flag1) {
1313 } else if (flag0 == 0xFF) {
1315 } else if (flag1 == 0xFF) {
1321 case FLAG_INCREMENTAL:
1322 if (flag0 == 255 && flag1 == 0)
1324 else if ((flag1 == 255 && flag0 == 0) ||
1327 else /* flag1 > flag0 */
1331 fprintf (stderr, "Unknown flag scheme %u \n",
1332 environment.flag_scheme);
1338 * If we are reading, we don't need the flag and the CRC any
1339 * more, if we are writing, we will re-calculate CRC and update
1340 * flags before writing out
1343 environment.image = addr1;
1344 environment.crc = &redundant->crc;
1345 environment.flags = &redundant->flags;
1346 environment.data = redundant->data;
1349 environment.image = addr0;
1350 /* Other pointers are already set */
1354 fprintf(stderr, "Selected env in %s\n", DEVNAME(dev_current));
1361 static int parse_config ()
1365 #if defined(CONFIG_FILE)
1366 /* Fills in DEVNAME(), ENVSIZE(), DEVESIZE(). Or don't. */
1367 if (get_config (CONFIG_FILE)) {
1369 "Cannot parse config file: %s\n", strerror (errno));
1373 DEVNAME (0) = DEVICE1_NAME;
1374 DEVOFFSET (0) = DEVICE1_OFFSET;
1375 ENVSIZE (0) = ENV1_SIZE;
1376 /* Default values are: erase-size=env-size */
1377 DEVESIZE (0) = ENVSIZE (0);
1378 /* #sectors=env-size/erase-size (rounded up) */
1379 ENVSECTORS (0) = (ENVSIZE(0) + DEVESIZE(0) - 1) / DEVESIZE(0);
1380 #ifdef DEVICE1_ESIZE
1381 DEVESIZE (0) = DEVICE1_ESIZE;
1383 #ifdef DEVICE1_ENVSECTORS
1384 ENVSECTORS (0) = DEVICE1_ENVSECTORS;
1388 DEVNAME (1) = DEVICE2_NAME;
1389 DEVOFFSET (1) = DEVICE2_OFFSET;
1390 ENVSIZE (1) = ENV2_SIZE;
1391 /* Default values are: erase-size=env-size */
1392 DEVESIZE (1) = ENVSIZE (1);
1393 /* #sectors=env-size/erase-size (rounded up) */
1394 ENVSECTORS (1) = (ENVSIZE(1) + DEVESIZE(1) - 1) / DEVESIZE(1);
1395 #ifdef DEVICE2_ESIZE
1396 DEVESIZE (1) = DEVICE2_ESIZE;
1398 #ifdef DEVICE2_ENVSECTORS
1399 ENVSECTORS (1) = DEVICE2_ENVSECTORS;
1404 if (stat (DEVNAME (0), &st)) {
1406 "Cannot access MTD device %s: %s\n",
1407 DEVNAME (0), strerror (errno));
1411 if (HaveRedundEnv && stat (DEVNAME (1), &st)) {
1413 "Cannot access MTD device %s: %s\n",
1414 DEVNAME (1), strerror (errno));
1420 #if defined(CONFIG_FILE)
1421 static int get_config (char *fname)
1429 fp = fopen (fname, "r");
1433 while (i < 2 && fgets (dump, sizeof (dump), fp)) {
1434 /* Skip incomplete conversions and comment strings */
1438 rc = sscanf (dump, "%ms %lx %lx %lx %lx",
1448 DEVNAME(i) = devname;
1451 /* Assume the erase size is the same as the env-size */
1452 DEVESIZE(i) = ENVSIZE(i);
1455 /* Assume enough env sectors to cover the environment */
1456 ENVSECTORS (i) = (ENVSIZE(i) + DEVESIZE(i) - 1) / DEVESIZE(i);
1462 HaveRedundEnv = i - 1;
1463 if (!i) { /* No valid entries found */