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+
15 #include <env_flags.h>
17 #include <linux/stringify.h>
23 #include <sys/types.h>
24 #include <sys/ioctl.h>
30 # include <linux/mtd/mtd.h>
32 # define __user /* nothing */
33 # include <mtd/mtd-user.h>
38 struct common_args common_args;
39 struct printenv_args printenv_args;
40 struct setenv_args setenv_args;
42 #define DIV_ROUND_UP(n, d) (((n) + (d) - 1) / (d))
44 #define min(x, y) ({ \
45 typeof(x) _min1 = (x); \
46 typeof(y) _min2 = (y); \
47 (void) (&_min1 == &_min2); \
48 _min1 < _min2 ? _min1 : _min2; })
51 const char *devname; /* Device name */
52 ulong devoff; /* Device offset */
53 ulong env_size; /* environment size */
54 ulong erase_size; /* device erase size */
55 ulong env_sectors; /* number of environment sectors */
56 uint8_t mtd_type; /* type of the MTD device */
59 static struct envdev_s envdevices[2] =
62 .mtd_type = MTD_ABSENT,
64 .mtd_type = MTD_ABSENT,
67 static int dev_current;
69 #define DEVNAME(i) envdevices[(i)].devname
70 #define DEVOFFSET(i) envdevices[(i)].devoff
71 #define ENVSIZE(i) envdevices[(i)].env_size
72 #define DEVESIZE(i) envdevices[(i)].erase_size
73 #define ENVSECTORS(i) envdevices[(i)].env_sectors
74 #define DEVTYPE(i) envdevices[(i)].mtd_type
76 #define CUR_ENVSIZE ENVSIZE(dev_current)
78 #define ENV_SIZE getenvsize()
80 struct env_image_single {
81 uint32_t crc; /* CRC32 over data bytes */
85 struct env_image_redundant {
86 uint32_t crc; /* CRC32 over data bytes */
87 unsigned char flags; /* active or obsolete */
100 unsigned char *flags;
102 enum flag_scheme flag_scheme;
105 static struct environment environment = {
106 .flag_scheme = FLAG_NONE,
109 static int env_aes_cbc_crypt(char *data, const int enc);
111 static int HaveRedundEnv = 0;
113 static unsigned char active_flag = 1;
114 /* obsolete_flag must be 0 to efficiently set it on NOR flash without erasing */
115 static unsigned char obsolete_flag = 0;
117 #define DEFAULT_ENV_INSTANCE_STATIC
118 #include <env_default.h>
120 static int flash_io (int mode);
121 static char *envmatch (char * s1, char * s2);
122 static int parse_config (void);
124 #if defined(CONFIG_FILE)
125 static int get_config (char *);
127 static inline ulong getenvsize (void)
129 ulong rc = CUR_ENVSIZE - sizeof(uint32_t);
134 if (common_args.aes_flag)
135 rc &= ~(AES_KEY_LENGTH - 1);
140 static char *skip_chars(char *s)
142 for (; *s != '\0'; s++) {
149 static char *skip_blanks(char *s)
151 for (; *s != '\0'; s++) {
159 * Search the environment for a variable.
160 * Return the value, if found, or NULL, if not found.
162 char *fw_getenv (char *name)
166 for (env = environment.data; *env; env = nxt + 1) {
169 for (nxt = env; *nxt; ++nxt) {
170 if (nxt >= &environment.data[ENV_SIZE]) {
171 fprintf (stderr, "## Error: "
172 "environment not terminated\n");
176 val = envmatch (name, env);
185 * Search the default environment for a variable.
186 * Return the value, if found, or NULL, if not found.
188 char *fw_getdefenv(char *name)
192 for (env = default_environment; *env; env = nxt + 1) {
195 for (nxt = env; *nxt; ++nxt) {
196 if (nxt >= &default_environment[ENV_SIZE]) {
197 fprintf(stderr, "## Error: "
198 "default environment not terminated\n");
202 val = envmatch(name, env);
210 int parse_aes_key(char *key, uint8_t *bin_key)
212 char tmp[5] = { '0', 'x', 0, 0, 0 };
216 if (strnlen(key, 64) != 32) {
218 "## Error: '-a' option requires 16-byte AES key\n");
222 for (i = 0; i < 16; i++) {
226 ul = strtoul(tmp, NULL, 16);
229 "## Error: '-a' option requires valid AES key\n");
232 bin_key[i] = ul & 0xff;
239 * Print the current definition of one, or more, or all
240 * environment variables
242 int fw_printenv (int argc, char *argv[])
250 if (argc == 0) { /* Print all env variables */
251 for (env = environment.data; *env; env = nxt + 1) {
252 for (nxt = env; *nxt; ++nxt) {
253 if (nxt >= &environment.data[ENV_SIZE]) {
254 fprintf (stderr, "## Error: "
255 "environment not terminated\n");
260 printf ("%s\n", env);
265 if (printenv_args.name_suppress && argc != 1) {
267 "## Error: `-n' option requires exactly one argument\n");
271 for (i = 0; i < argc; ++i) { /* print single env variables */
272 char *name = argv[i];
275 for (env = environment.data; *env; env = nxt + 1) {
277 for (nxt = env; *nxt; ++nxt) {
278 if (nxt >= &environment.data[ENV_SIZE]) {
279 fprintf (stderr, "## Error: "
280 "environment not terminated\n");
284 val = envmatch (name, env);
286 if (!printenv_args.name_suppress) {
287 fputs (name, stdout);
295 fprintf (stderr, "## Error: \"%s\" not defined\n", name);
303 int fw_env_close(void)
306 if (common_args.aes_flag) {
307 ret = env_aes_cbc_crypt(environment.data, 1);
310 "Error: can't encrypt env for flash\n");
318 *environment.crc = crc32(0, (uint8_t *) environment.data, ENV_SIZE);
320 /* write environment back to flash */
321 if (flash_io(O_RDWR)) {
323 "Error: can't write fw_env to flash\n");
332 * Set/Clear a single variable in the environment.
333 * This is called in sequence to update the environment
334 * in RAM without updating the copy in flash after each set
336 int fw_env_write(char *name, char *value)
341 int deleting, creating, overwriting;
344 * search if variable with this name already exists
346 for (nxt = env = environment.data; *env; env = nxt + 1) {
347 for (nxt = env; *nxt; ++nxt) {
348 if (nxt >= &environment.data[ENV_SIZE]) {
349 fprintf(stderr, "## Error: "
350 "environment not terminated\n");
355 if ((oldval = envmatch (name, env)) != NULL)
359 deleting = (oldval && !(value && strlen(value)));
360 creating = (!oldval && (value && strlen(value)));
361 overwriting = (oldval && (value && strlen(value)));
363 /* check for permission */
365 if (env_flags_validate_varaccess(name,
366 ENV_FLAGS_VARACCESS_PREVENT_DELETE)) {
367 printf("Can't delete \"%s\"\n", name);
371 } else if (overwriting) {
372 if (env_flags_validate_varaccess(name,
373 ENV_FLAGS_VARACCESS_PREVENT_OVERWR)) {
374 printf("Can't overwrite \"%s\"\n", name);
377 } else if (env_flags_validate_varaccess(name,
378 ENV_FLAGS_VARACCESS_PREVENT_NONDEF_OVERWR)) {
379 const char *defval = fw_getdefenv(name);
383 if (strcmp(oldval, defval)
385 printf("Can't overwrite \"%s\"\n", name);
390 } else if (creating) {
391 if (env_flags_validate_varaccess(name,
392 ENV_FLAGS_VARACCESS_PREVENT_CREATE)) {
393 printf("Can't create \"%s\"\n", name);
401 if (deleting || overwriting) {
402 if (*++nxt == '\0') {
407 if ((*env == '\0') && (*nxt == '\0'))
416 if (!value || !strlen(value))
420 * Append new definition at the end
422 for (env = environment.data; *env || *(env + 1); ++env);
423 if (env > environment.data)
427 * "name" + "=" + "val" +"\0\0" > CUR_ENVSIZE - (env-environment)
429 len = strlen (name) + 2;
430 /* add '=' for first arg, ' ' for all others */
431 len += strlen(value) + 1;
433 if (len > (&environment.data[ENV_SIZE] - env)) {
435 "Error: environment overflow, \"%s\" deleted\n",
440 while ((*env = *name++) != '\0')
443 while ((*++env = *value++) != '\0')
446 /* end is marked with double '\0' */
453 * Deletes or sets environment variables. Returns -1 and sets errno error codes:
455 * EINVAL - need at least 1 argument
456 * EROFS - certain variables ("ethaddr", "serial#") cannot be
457 * modified or deleted
460 int fw_setenv(int argc, char *argv[])
469 fprintf(stderr, "## Error: variable name missing\n");
475 fprintf(stderr, "Error: environment not initialized\n");
483 if (env_flags_validate_env_set_params(name, valv, valc) < 0)
487 for (i = 0; i < valc; ++i) {
489 size_t val_len = strlen(val);
492 value[len - 1] = ' ';
493 value = realloc(value, len + val_len + 1);
496 "Cannot malloc %zu bytes: %s\n",
497 len, strerror(errno));
501 memcpy(value + len, val, val_len);
506 fw_env_write(name, value);
510 return fw_env_close();
514 * Parse a file and configure the u-boot variables.
515 * The script file has a very simple format, as follows:
517 * Each line has a couple with name, value:
518 * <white spaces>variable_name<white spaces>variable_value
520 * Both variable_name and variable_value are interpreted as strings.
521 * Any character after <white spaces> and before ending \r\n is interpreted
522 * as variable's value (no comment allowed on these lines !)
524 * Comments are allowed if the first character in the line is #
526 * Returns -1 and sets errno error codes:
530 int fw_parse_script(char *fname)
533 char dump[1024]; /* Maximum line length in the file */
541 fprintf(stderr, "Error: environment not initialized\n");
545 if (strcmp(fname, "-") == 0)
548 fp = fopen(fname, "r");
550 fprintf(stderr, "I cannot open %s for reading\n",
556 while (fgets(dump, sizeof(dump), fp)) {
561 * Read a whole line from the file. If the line is too long
562 * or is not terminated, reports an error and exit.
564 if (dump[len - 1] != '\n') {
566 "Line %d not corrected terminated or too long\n",
572 /* Drop ending line feed / carriage return */
574 if (len && dump[len - 1] == '\r')
577 /* Skip comment or empty lines */
578 if (len == 0 || dump[0] == '#')
582 * Search for variable's name,
583 * remove leading whitespaces
585 name = skip_blanks(dump);
589 /* The first white space is the end of variable name */
590 val = skip_chars(name);
594 if ((val - name) < len)
595 val = skip_blanks(val);
601 fprintf(stderr, "Setting %s : %s\n",
602 name, val ? val : " removed");
605 if (env_flags_validate_type(name, val) < 0) {
611 * If there is an error setting a variable,
612 * try to save the environment and returns an error
614 if (fw_env_write(name, val)) {
616 "fw_env_write returns with error : %s\n",
624 /* Close file if not stdin */
625 if (strcmp(fname, "-") != 0)
628 ret |= fw_env_close();
635 * Test for bad block on NAND, just returns 0 on NOR, on NAND:
638 * < 0 - failed to test
640 static int flash_bad_block (int fd, uint8_t mtd_type, loff_t *blockstart)
642 if (mtd_type == MTD_NANDFLASH) {
643 int badblock = ioctl (fd, MEMGETBADBLOCK, blockstart);
646 perror ("Cannot read bad block mark");
652 fprintf (stderr, "Bad block at 0x%llx, "
653 "skipping\n", *blockstart);
663 * Read data from flash at an offset into a provided buffer. On NAND it skips
664 * bad blocks but makes sure it stays within ENVSECTORS (dev) starting from
665 * the DEVOFFSET (dev) block. On NOR the loop is only run once.
667 static int flash_read_buf (int dev, int fd, void *buf, size_t count,
668 off_t offset, uint8_t mtd_type)
670 size_t blocklen; /* erase / write length - one block on NAND,
672 size_t processed = 0; /* progress counter */
673 size_t readlen = count; /* current read length */
674 off_t top_of_range; /* end of the last block we may use */
675 off_t block_seek; /* offset inside the current block to the start
677 loff_t blockstart; /* running start of the current block -
678 MEMGETBADBLOCK needs 64 bits */
681 blockstart = (offset / DEVESIZE (dev)) * DEVESIZE (dev);
683 /* Offset inside a block */
684 block_seek = offset - blockstart;
686 if (mtd_type == MTD_NANDFLASH) {
688 * NAND: calculate which blocks we are reading. We have
689 * to read one block at a time to skip bad blocks.
691 blocklen = DEVESIZE (dev);
694 * To calculate the top of the range, we have to use the
695 * global DEVOFFSET (dev), which can be different from offset
697 top_of_range = ((DEVOFFSET(dev) / blocklen) +
698 ENVSECTORS (dev)) * blocklen;
700 /* Limit to one block for the first read */
701 if (readlen > blocklen - block_seek)
702 readlen = blocklen - block_seek;
705 top_of_range = offset + count;
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 */
714 if (blockstart + block_seek + readlen > top_of_range) {
715 /* End of range is reached */
717 "Too few good blocks within range\n");
721 if (rc) { /* block is bad */
722 blockstart += blocklen;
727 * If a block is bad, we retry in the next block at the same
728 * offset - see common/env_nand.c::writeenv()
730 lseek (fd, blockstart + block_seek, SEEK_SET);
732 rc = read (fd, buf + processed, readlen);
734 fprintf (stderr, "Read error on %s: %s\n",
735 DEVNAME (dev), strerror (errno));
739 fprintf(stderr, "Read 0x%x bytes at 0x%llx on %s\n",
740 rc, blockstart + block_seek, DEVNAME(dev));
742 processed += readlen;
743 readlen = min (blocklen, count - processed);
745 blockstart += blocklen;
752 * Write count bytes at offset, but stay within ENVSECTORS (dev) sectors of
753 * DEVOFFSET (dev). Similar to the read case above, on NOR and dataflash we
754 * erase and write the whole data at once.
756 static int flash_write_buf (int dev, int fd, void *buf, size_t count,
757 off_t offset, uint8_t mtd_type)
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
764 size_t erasesize; /* erase / write length - one block on NAND,
766 size_t processed = 0; /* progress counter */
767 size_t write_total; /* total size to actually write - excluding
769 off_t erase_offset; /* offset to the first erase block (aligned)
771 off_t block_seek; /* offset inside the erase block to the start
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 */
779 * For mtd devices only offset and size of the environment do matter
781 if (mtd_type == MTD_ABSENT) {
783 top_of_range = offset + count;
784 erase_len = blocklen;
787 write_total = blocklen;
789 blocklen = DEVESIZE(dev);
791 top_of_range = ((DEVOFFSET(dev) / blocklen) +
792 ENVSECTORS(dev)) * blocklen;
794 erase_offset = (offset / blocklen) * blocklen;
796 /* Maximum area we may use */
797 erase_len = top_of_range - erase_offset;
799 blockstart = erase_offset;
800 /* Offset inside a block */
801 block_seek = offset - erase_offset;
804 * Data size we actually write: from the start of the block
805 * to the start of the data, then count bytes of data, and
806 * to the end of the block
808 write_total = ((block_seek + count + blocklen - 1) /
809 blocklen) * blocklen;
813 * Support data anywhere within erase sectors: read out the complete
814 * area to be erased, replace the environment image, write the whole
817 if (write_total > count) {
818 data = malloc (erase_len);
821 "Cannot malloc %zu bytes: %s\n",
822 erase_len, strerror (errno));
826 rc = flash_read_buf (dev, fd, data, write_total, erase_offset,
828 if (write_total != rc)
832 fprintf(stderr, "Preserving data ");
834 fprintf(stderr, "0x%x - 0x%lx", 0, block_seek - 1);
835 if (block_seek + count != write_total) {
837 fprintf(stderr, " and ");
838 fprintf(stderr, "0x%lx - 0x%x",
839 block_seek + count, write_total - 1);
841 fprintf(stderr, "\n");
843 /* Overwrite the old environment */
844 memcpy (data + block_seek, buf, count);
847 * We get here, iff offset is block-aligned and count is a
848 * multiple of blocklen - see write_total calculation above
853 if (mtd_type == MTD_NANDFLASH) {
855 * NAND: calculate which blocks we are writing. We have
856 * to write one block at a time to skip bad blocks.
858 erasesize = blocklen;
860 erasesize = erase_len;
863 erase.length = erasesize;
865 /* This only runs once on NOR flash and SPI-dataflash */
866 while (processed < write_total) {
867 rc = flash_bad_block (fd, mtd_type, &blockstart);
868 if (rc < 0) /* block test failed */
871 if (blockstart + erasesize > top_of_range) {
872 fprintf (stderr, "End of range reached, aborting\n");
876 if (rc) { /* block is bad */
877 blockstart += blocklen;
881 if (mtd_type != MTD_ABSENT) {
882 erase.start = blockstart;
883 ioctl(fd, MEMUNLOCK, &erase);
884 /* These do not need an explicit erase cycle */
885 if (mtd_type != MTD_DATAFLASH)
886 if (ioctl(fd, MEMERASE, &erase) != 0) {
888 "MTD erase error on %s: %s\n",
889 DEVNAME(dev), strerror(errno));
894 if (lseek (fd, blockstart, SEEK_SET) == -1) {
896 "Seek error on %s: %s\n",
897 DEVNAME (dev), strerror (errno));
902 fprintf(stderr, "Write 0x%x bytes at 0x%llx\n", erasesize,
905 if (write (fd, data + processed, erasesize) != erasesize) {
906 fprintf (stderr, "Write error on %s: %s\n",
907 DEVNAME (dev), strerror (errno));
911 if (mtd_type != MTD_ABSENT)
912 ioctl(fd, MEMLOCK, &erase);
914 processed += erasesize;
916 blockstart += erasesize;
919 if (write_total > count)
926 * Set obsolete flag at offset - NOR flash only
928 static int flash_flag_obsolete (int dev, int fd, off_t offset)
931 struct erase_info_user erase;
933 erase.start = DEVOFFSET (dev);
934 erase.length = DEVESIZE (dev);
935 /* This relies on the fact, that obsolete_flag == 0 */
936 rc = lseek (fd, offset, SEEK_SET);
938 fprintf (stderr, "Cannot seek to set the flag on %s \n",
942 ioctl (fd, MEMUNLOCK, &erase);
943 rc = write (fd, &obsolete_flag, sizeof (obsolete_flag));
944 ioctl (fd, MEMLOCK, &erase);
946 perror ("Could not set obsolete flag");
951 /* Encrypt or decrypt the environment before writing or reading it. */
952 static int env_aes_cbc_crypt(char *payload, const int enc)
954 uint8_t *data = (uint8_t *)payload;
955 const int len = getenvsize();
956 uint8_t key_exp[AES_EXPAND_KEY_LENGTH];
959 /* First we expand the key. */
960 aes_expand_key(common_args.aes_key, key_exp);
962 /* Calculate the number of AES blocks to encrypt. */
963 aes_blocks = DIV_ROUND_UP(len, AES_KEY_LENGTH);
966 aes_cbc_encrypt_blocks(key_exp, data, data, aes_blocks);
968 aes_cbc_decrypt_blocks(key_exp, data, data, aes_blocks);
973 static int flash_write (int fd_current, int fd_target, int dev_target)
977 switch (environment.flag_scheme) {
980 case FLAG_INCREMENTAL:
981 (*environment.flags)++;
984 *environment.flags = active_flag;
987 fprintf (stderr, "Unimplemented flash scheme %u \n",
988 environment.flag_scheme);
993 fprintf(stderr, "Writing new environment at 0x%lx on %s\n",
994 DEVOFFSET (dev_target), DEVNAME (dev_target));
997 rc = flash_write_buf(dev_target, fd_target, environment.image,
998 CUR_ENVSIZE, DEVOFFSET(dev_target),
999 DEVTYPE(dev_target));
1003 if (environment.flag_scheme == FLAG_BOOLEAN) {
1004 /* Have to set obsolete flag */
1005 off_t offset = DEVOFFSET (dev_current) +
1006 offsetof (struct env_image_redundant, flags);
1009 "Setting obsolete flag in environment at 0x%lx on %s\n",
1010 DEVOFFSET (dev_current), DEVNAME (dev_current));
1012 flash_flag_obsolete (dev_current, fd_current, offset);
1018 static int flash_read (int fd)
1020 struct mtd_info_user mtdinfo;
1024 rc = fstat(fd, &st);
1026 fprintf(stderr, "Cannot stat the file %s\n",
1027 DEVNAME(dev_current));
1031 if (S_ISCHR(st.st_mode)) {
1032 rc = ioctl(fd, MEMGETINFO, &mtdinfo);
1034 fprintf(stderr, "Cannot get MTD information for %s\n",
1035 DEVNAME(dev_current));
1038 if (mtdinfo.type != MTD_NORFLASH &&
1039 mtdinfo.type != MTD_NANDFLASH &&
1040 mtdinfo.type != MTD_DATAFLASH &&
1041 mtdinfo.type != MTD_UBIVOLUME) {
1042 fprintf (stderr, "Unsupported flash type %u on %s\n",
1043 mtdinfo.type, DEVNAME(dev_current));
1047 memset(&mtdinfo, 0, sizeof(mtdinfo));
1048 mtdinfo.type = MTD_ABSENT;
1051 DEVTYPE(dev_current) = mtdinfo.type;
1053 rc = flash_read_buf(dev_current, fd, environment.image, CUR_ENVSIZE,
1054 DEVOFFSET (dev_current), mtdinfo.type);
1055 if (rc != CUR_ENVSIZE)
1061 static int flash_io (int mode)
1063 int fd_current, fd_target, rc, dev_target;
1065 /* dev_current: fd_current, erase_current */
1066 fd_current = open (DEVNAME (dev_current), mode);
1067 if (fd_current < 0) {
1069 "Can't open %s: %s\n",
1070 DEVNAME (dev_current), strerror (errno));
1074 if (mode == O_RDWR) {
1075 if (HaveRedundEnv) {
1076 /* switch to next partition for writing */
1077 dev_target = !dev_current;
1078 /* dev_target: fd_target, erase_target */
1079 fd_target = open (DEVNAME (dev_target), mode);
1080 if (fd_target < 0) {
1082 "Can't open %s: %s\n",
1083 DEVNAME (dev_target),
1089 dev_target = dev_current;
1090 fd_target = fd_current;
1093 rc = flash_write (fd_current, fd_target, dev_target);
1095 if (HaveRedundEnv) {
1096 if (close (fd_target)) {
1098 "I/O error on %s: %s\n",
1099 DEVNAME (dev_target),
1105 rc = flash_read (fd_current);
1109 if (close (fd_current)) {
1111 "I/O error on %s: %s\n",
1112 DEVNAME (dev_current), strerror (errno));
1120 * s1 is either a simple 'name', or a 'name=value' pair.
1121 * s2 is a 'name=value' pair.
1122 * If the names match, return the value of s2, else NULL.
1125 static char *envmatch (char * s1, char * s2)
1127 if (s1 == NULL || s2 == NULL)
1130 while (*s1 == *s2++)
1133 if (*s1 == '\0' && *(s2 - 1) == '=')
1139 * Prevent confusion if running from erased flash memory
1141 int fw_env_open(void)
1144 unsigned char flag0;
1148 unsigned char flag1;
1153 struct env_image_single *single;
1154 struct env_image_redundant *redundant;
1156 if (parse_config ()) /* should fill envdevices */
1159 addr0 = calloc(1, CUR_ENVSIZE);
1160 if (addr0 == NULL) {
1162 "Not enough memory for environment (%ld bytes)\n",
1167 /* read environment from FLASH to local buffer */
1168 environment.image = addr0;
1170 if (HaveRedundEnv) {
1172 environment.crc = &redundant->crc;
1173 environment.flags = &redundant->flags;
1174 environment.data = redundant->data;
1177 environment.crc = &single->crc;
1178 environment.flags = NULL;
1179 environment.data = single->data;
1183 if (flash_io (O_RDONLY))
1186 crc0 = crc32 (0, (uint8_t *) environment.data, ENV_SIZE);
1188 if (common_args.aes_flag) {
1189 ret = env_aes_cbc_crypt(environment.data, 0);
1194 crc0_ok = (crc0 == *environment.crc);
1195 if (!HaveRedundEnv) {
1198 "Warning: Bad CRC, using default environment\n");
1199 memcpy(environment.data, default_environment, sizeof default_environment);
1202 flag0 = *environment.flags;
1205 addr1 = calloc(1, CUR_ENVSIZE);
1206 if (addr1 == NULL) {
1208 "Not enough memory for environment (%ld bytes)\n",
1215 * have to set environment.image for flash_read(), careful -
1216 * other pointers in environment still point inside addr0
1218 environment.image = addr1;
1219 if (flash_io (O_RDONLY))
1222 /* Check flag scheme compatibility */
1223 if (DEVTYPE(dev_current) == MTD_NORFLASH &&
1224 DEVTYPE(!dev_current) == MTD_NORFLASH) {
1225 environment.flag_scheme = FLAG_BOOLEAN;
1226 } else if (DEVTYPE(dev_current) == MTD_NANDFLASH &&
1227 DEVTYPE(!dev_current) == MTD_NANDFLASH) {
1228 environment.flag_scheme = FLAG_INCREMENTAL;
1229 } else if (DEVTYPE(dev_current) == MTD_DATAFLASH &&
1230 DEVTYPE(!dev_current) == MTD_DATAFLASH) {
1231 environment.flag_scheme = FLAG_BOOLEAN;
1232 } else if (DEVTYPE(dev_current) == MTD_UBIVOLUME &&
1233 DEVTYPE(!dev_current) == MTD_UBIVOLUME) {
1234 environment.flag_scheme = FLAG_INCREMENTAL;
1235 } else if (DEVTYPE(dev_current) == MTD_ABSENT &&
1236 DEVTYPE(!dev_current) == MTD_ABSENT) {
1237 environment.flag_scheme = FLAG_INCREMENTAL;
1239 fprintf (stderr, "Incompatible flash types!\n");
1243 crc1 = crc32 (0, (uint8_t *) redundant->data, ENV_SIZE);
1245 if (common_args.aes_flag) {
1246 ret = env_aes_cbc_crypt(redundant->data, 0);
1251 crc1_ok = (crc1 == redundant->crc);
1252 flag1 = redundant->flags;
1254 if (crc0_ok && !crc1_ok) {
1256 } else if (!crc0_ok && crc1_ok) {
1258 } else if (!crc0_ok && !crc1_ok) {
1260 "Warning: Bad CRC, using default environment\n");
1261 memcpy (environment.data, default_environment,
1262 sizeof default_environment);
1265 switch (environment.flag_scheme) {
1267 if (flag0 == active_flag &&
1268 flag1 == obsolete_flag) {
1270 } else if (flag0 == obsolete_flag &&
1271 flag1 == active_flag) {
1273 } else if (flag0 == flag1) {
1275 } else if (flag0 == 0xFF) {
1277 } else if (flag1 == 0xFF) {
1283 case FLAG_INCREMENTAL:
1284 if (flag0 == 255 && flag1 == 0)
1286 else if ((flag1 == 255 && flag0 == 0) ||
1289 else /* flag1 > flag0 */
1293 fprintf (stderr, "Unknown flag scheme %u \n",
1294 environment.flag_scheme);
1300 * If we are reading, we don't need the flag and the CRC any
1301 * more, if we are writing, we will re-calculate CRC and update
1302 * flags before writing out
1305 environment.image = addr1;
1306 environment.crc = &redundant->crc;
1307 environment.flags = &redundant->flags;
1308 environment.data = redundant->data;
1311 environment.image = addr0;
1312 /* Other pointers are already set */
1316 fprintf(stderr, "Selected env in %s\n", DEVNAME(dev_current));
1323 static int parse_config ()
1327 #if defined(CONFIG_FILE)
1328 /* Fills in DEVNAME(), ENVSIZE(), DEVESIZE(). Or don't. */
1329 if (get_config(common_args.config_file)) {
1330 fprintf(stderr, "Cannot parse config file '%s': %m\n",
1331 common_args.config_file);
1335 DEVNAME (0) = DEVICE1_NAME;
1336 DEVOFFSET (0) = DEVICE1_OFFSET;
1337 ENVSIZE (0) = ENV1_SIZE;
1338 /* Default values are: erase-size=env-size */
1339 DEVESIZE (0) = ENVSIZE (0);
1340 /* #sectors=env-size/erase-size (rounded up) */
1341 ENVSECTORS (0) = (ENVSIZE(0) + DEVESIZE(0) - 1) / DEVESIZE(0);
1342 #ifdef DEVICE1_ESIZE
1343 DEVESIZE (0) = DEVICE1_ESIZE;
1345 #ifdef DEVICE1_ENVSECTORS
1346 ENVSECTORS (0) = DEVICE1_ENVSECTORS;
1350 DEVNAME (1) = DEVICE2_NAME;
1351 DEVOFFSET (1) = DEVICE2_OFFSET;
1352 ENVSIZE (1) = ENV2_SIZE;
1353 /* Default values are: erase-size=env-size */
1354 DEVESIZE (1) = ENVSIZE (1);
1355 /* #sectors=env-size/erase-size (rounded up) */
1356 ENVSECTORS (1) = (ENVSIZE(1) + DEVESIZE(1) - 1) / DEVESIZE(1);
1357 #ifdef DEVICE2_ESIZE
1358 DEVESIZE (1) = DEVICE2_ESIZE;
1360 #ifdef DEVICE2_ENVSECTORS
1361 ENVSECTORS (1) = DEVICE2_ENVSECTORS;
1366 if (stat (DEVNAME (0), &st)) {
1368 "Cannot access MTD device %s: %s\n",
1369 DEVNAME (0), strerror (errno));
1373 if (HaveRedundEnv && stat (DEVNAME (1), &st)) {
1375 "Cannot access MTD device %s: %s\n",
1376 DEVNAME (1), strerror (errno));
1382 #if defined(CONFIG_FILE)
1383 static int get_config (char *fname)
1391 fp = fopen (fname, "r");
1395 while (i < 2 && fgets (dump, sizeof (dump), fp)) {
1396 /* Skip incomplete conversions and comment strings */
1400 rc = sscanf (dump, "%ms %lx %lx %lx %lx",
1410 DEVNAME(i) = devname;
1413 /* Assume the erase size is the same as the env-size */
1414 DEVESIZE(i) = ENVSIZE(i);
1417 /* Assume enough env sectors to cover the environment */
1418 ENVSECTORS (i) = (ENVSIZE(i) + DEVESIZE(i) - 1) / DEVESIZE(i);
1424 HaveRedundEnv = i - 1;
1425 if (!i) { /* No valid entries found */