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 #define DIV_ROUND_UP(n, d) (((n) + (d) - 1) / (d))
40 #define min(x, y) ({ \
41 typeof(x) _min1 = (x); \
42 typeof(y) _min2 = (y); \
43 (void) (&_min1 == &_min2); \
44 _min1 < _min2 ? _min1 : _min2; })
47 const char *devname; /* Device name */
48 ulong devoff; /* Device offset */
49 ulong env_size; /* environment size */
50 ulong erase_size; /* device erase size */
51 ulong env_sectors; /* number of environment sectors */
52 uint8_t mtd_type; /* type of the MTD device */
55 static struct envdev_s envdevices[2] =
58 .mtd_type = MTD_ABSENT,
60 .mtd_type = MTD_ABSENT,
63 static int dev_current;
65 #define DEVNAME(i) envdevices[(i)].devname
66 #define DEVOFFSET(i) envdevices[(i)].devoff
67 #define ENVSIZE(i) envdevices[(i)].env_size
68 #define DEVESIZE(i) envdevices[(i)].erase_size
69 #define ENVSECTORS(i) envdevices[(i)].env_sectors
70 #define DEVTYPE(i) envdevices[(i)].mtd_type
72 #define CUR_ENVSIZE ENVSIZE(dev_current)
74 static unsigned long usable_envsize;
75 #define ENV_SIZE usable_envsize
77 struct env_image_single {
78 uint32_t crc; /* CRC32 over data bytes */
82 struct env_image_redundant {
83 uint32_t crc; /* CRC32 over data bytes */
84 unsigned char flags; /* active or obsolete */
99 enum flag_scheme flag_scheme;
102 static struct environment environment = {
103 .flag_scheme = FLAG_NONE,
106 static int env_aes_cbc_crypt(char *data, const int enc, uint8_t *key);
108 static int HaveRedundEnv = 0;
110 static unsigned char active_flag = 1;
111 /* obsolete_flag must be 0 to efficiently set it on NOR flash without erasing */
112 static unsigned char obsolete_flag = 0;
114 #define DEFAULT_ENV_INSTANCE_STATIC
115 #include <env_default.h>
117 static int flash_io (int mode);
118 static char *envmatch (char * s1, char * s2);
119 static int parse_config(struct env_opts *opts);
121 #if defined(CONFIG_FILE)
122 static int get_config (char *);
125 static char *skip_chars(char *s)
127 for (; *s != '\0'; s++) {
134 static char *skip_blanks(char *s)
136 for (; *s != '\0'; s++) {
144 * Search the environment for a variable.
145 * Return the value, if found, or NULL, if not found.
147 char *fw_getenv (char *name)
151 for (env = environment.data; *env; env = nxt + 1) {
154 for (nxt = env; *nxt; ++nxt) {
155 if (nxt >= &environment.data[ENV_SIZE]) {
156 fprintf (stderr, "## Error: "
157 "environment not terminated\n");
161 val = envmatch (name, env);
170 * Search the default environment for a variable.
171 * Return the value, if found, or NULL, if not found.
173 char *fw_getdefenv(char *name)
177 for (env = default_environment; *env; env = nxt + 1) {
180 for (nxt = env; *nxt; ++nxt) {
181 if (nxt >= &default_environment[ENV_SIZE]) {
182 fprintf(stderr, "## Error: "
183 "default environment not terminated\n");
187 val = envmatch(name, env);
195 int parse_aes_key(char *key, uint8_t *bin_key)
197 char tmp[5] = { '0', 'x', 0, 0, 0 };
201 if (strnlen(key, 64) != 32) {
203 "## Error: '-a' option requires 16-byte AES key\n");
207 for (i = 0; i < 16; i++) {
211 ul = strtoul(tmp, NULL, 16);
214 "## Error: '-a' option requires valid AES key\n");
217 bin_key[i] = ul & 0xff;
224 * Print the current definition of one, or more, or all
225 * environment variables
227 int fw_printenv(int argc, char *argv[], int value_only, struct env_opts *opts)
232 if (fw_env_open(opts))
235 if (argc == 0) { /* Print all env variables */
236 for (env = environment.data; *env; env = nxt + 1) {
237 for (nxt = env; *nxt; ++nxt) {
238 if (nxt >= &environment.data[ENV_SIZE]) {
239 fprintf (stderr, "## Error: "
240 "environment not terminated\n");
245 printf ("%s\n", env);
250 if (value_only && argc != 1) {
252 "## Error: `-n' option requires exactly one argument\n");
256 for (i = 0; i < argc; ++i) { /* print single env variables */
257 char *name = argv[i];
260 for (env = environment.data; *env; env = nxt + 1) {
262 for (nxt = env; *nxt; ++nxt) {
263 if (nxt >= &environment.data[ENV_SIZE]) {
264 fprintf (stderr, "## Error: "
265 "environment not terminated\n");
269 val = envmatch (name, env);
272 fputs (name, stdout);
280 fprintf (stderr, "## Error: \"%s\" not defined\n", name);
288 int fw_env_close(struct env_opts *opts)
292 if (opts->aes_flag) {
293 ret = env_aes_cbc_crypt(environment.data, 1,
297 "Error: can't encrypt env for flash\n");
305 *environment.crc = crc32(0, (uint8_t *) environment.data, ENV_SIZE);
307 /* write environment back to flash */
308 if (flash_io(O_RDWR)) {
310 "Error: can't write fw_env to flash\n");
319 * Set/Clear a single variable in the environment.
320 * This is called in sequence to update the environment
321 * in RAM without updating the copy in flash after each set
323 int fw_env_write(char *name, char *value)
328 int deleting, creating, overwriting;
331 * search if variable with this name already exists
333 for (nxt = env = environment.data; *env; env = nxt + 1) {
334 for (nxt = env; *nxt; ++nxt) {
335 if (nxt >= &environment.data[ENV_SIZE]) {
336 fprintf(stderr, "## Error: "
337 "environment not terminated\n");
342 if ((oldval = envmatch (name, env)) != NULL)
346 deleting = (oldval && !(value && strlen(value)));
347 creating = (!oldval && (value && strlen(value)));
348 overwriting = (oldval && (value && strlen(value)));
350 /* check for permission */
352 if (env_flags_validate_varaccess(name,
353 ENV_FLAGS_VARACCESS_PREVENT_DELETE)) {
354 printf("Can't delete \"%s\"\n", name);
358 } else if (overwriting) {
359 if (env_flags_validate_varaccess(name,
360 ENV_FLAGS_VARACCESS_PREVENT_OVERWR)) {
361 printf("Can't overwrite \"%s\"\n", name);
364 } else if (env_flags_validate_varaccess(name,
365 ENV_FLAGS_VARACCESS_PREVENT_NONDEF_OVERWR)) {
366 const char *defval = fw_getdefenv(name);
370 if (strcmp(oldval, defval)
372 printf("Can't overwrite \"%s\"\n", name);
377 } else if (creating) {
378 if (env_flags_validate_varaccess(name,
379 ENV_FLAGS_VARACCESS_PREVENT_CREATE)) {
380 printf("Can't create \"%s\"\n", name);
388 if (deleting || overwriting) {
389 if (*++nxt == '\0') {
394 if ((*env == '\0') && (*nxt == '\0'))
403 if (!value || !strlen(value))
407 * Append new definition at the end
409 for (env = environment.data; *env || *(env + 1); ++env);
410 if (env > environment.data)
414 * "name" + "=" + "val" +"\0\0" > CUR_ENVSIZE - (env-environment)
416 len = strlen (name) + 2;
417 /* add '=' for first arg, ' ' for all others */
418 len += strlen(value) + 1;
420 if (len > (&environment.data[ENV_SIZE] - env)) {
422 "Error: environment overflow, \"%s\" deleted\n",
427 while ((*env = *name++) != '\0')
430 while ((*++env = *value++) != '\0')
433 /* end is marked with double '\0' */
440 * Deletes or sets environment variables. Returns -1 and sets errno error codes:
442 * EINVAL - need at least 1 argument
443 * EROFS - certain variables ("ethaddr", "serial#") cannot be
444 * modified or deleted
447 int fw_setenv(int argc, char *argv[], struct env_opts *opts)
456 fprintf(stderr, "## Error: variable name missing\n");
461 if (fw_env_open(opts)) {
462 fprintf(stderr, "Error: environment not initialized\n");
470 if (env_flags_validate_env_set_params(name, valv, valc) < 0)
474 for (i = 0; i < valc; ++i) {
476 size_t val_len = strlen(val);
479 value[len - 1] = ' ';
480 value = realloc(value, len + val_len + 1);
483 "Cannot malloc %zu bytes: %s\n",
484 len, strerror(errno));
488 memcpy(value + len, val, val_len);
493 fw_env_write(name, value);
497 return fw_env_close(opts);
501 * Parse a file and configure the u-boot variables.
502 * The script file has a very simple format, as follows:
504 * Each line has a couple with name, value:
505 * <white spaces>variable_name<white spaces>variable_value
507 * Both variable_name and variable_value are interpreted as strings.
508 * Any character after <white spaces> and before ending \r\n is interpreted
509 * as variable's value (no comment allowed on these lines !)
511 * Comments are allowed if the first character in the line is #
513 * Returns -1 and sets errno error codes:
517 int fw_parse_script(char *fname, struct env_opts *opts)
520 char dump[1024]; /* Maximum line length in the file */
527 if (fw_env_open(opts)) {
528 fprintf(stderr, "Error: environment not initialized\n");
532 if (strcmp(fname, "-") == 0)
535 fp = fopen(fname, "r");
537 fprintf(stderr, "I cannot open %s for reading\n",
543 while (fgets(dump, sizeof(dump), fp)) {
548 * Read a whole line from the file. If the line is too long
549 * or is not terminated, reports an error and exit.
551 if (dump[len - 1] != '\n') {
553 "Line %d not corrected terminated or too long\n",
559 /* Drop ending line feed / carriage return */
561 if (len && dump[len - 1] == '\r')
564 /* Skip comment or empty lines */
565 if (len == 0 || dump[0] == '#')
569 * Search for variable's name,
570 * remove leading whitespaces
572 name = skip_blanks(dump);
576 /* The first white space is the end of variable name */
577 val = skip_chars(name);
581 if ((val - name) < len)
582 val = skip_blanks(val);
588 fprintf(stderr, "Setting %s : %s\n",
589 name, val ? val : " removed");
592 if (env_flags_validate_type(name, val) < 0) {
598 * If there is an error setting a variable,
599 * try to save the environment and returns an error
601 if (fw_env_write(name, val)) {
603 "fw_env_write returns with error : %s\n",
611 /* Close file if not stdin */
612 if (strcmp(fname, "-") != 0)
615 ret |= fw_env_close(opts);
621 * Test for bad block on NAND, just returns 0 on NOR, on NAND:
624 * < 0 - failed to test
626 static int flash_bad_block (int fd, uint8_t mtd_type, loff_t *blockstart)
628 if (mtd_type == MTD_NANDFLASH) {
629 int badblock = ioctl (fd, MEMGETBADBLOCK, blockstart);
632 perror ("Cannot read bad block mark");
638 fprintf (stderr, "Bad block at 0x%llx, "
639 "skipping\n", *blockstart);
649 * Read data from flash at an offset into a provided buffer. On NAND it skips
650 * bad blocks but makes sure it stays within ENVSECTORS (dev) starting from
651 * the DEVOFFSET (dev) block. On NOR the loop is only run once.
653 static int flash_read_buf (int dev, int fd, void *buf, size_t count,
654 off_t offset, uint8_t mtd_type)
656 size_t blocklen; /* erase / write length - one block on NAND,
658 size_t processed = 0; /* progress counter */
659 size_t readlen = count; /* current read length */
660 off_t top_of_range; /* end of the last block we may use */
661 off_t block_seek; /* offset inside the current block to the start
663 loff_t blockstart; /* running start of the current block -
664 MEMGETBADBLOCK needs 64 bits */
667 blockstart = (offset / DEVESIZE (dev)) * DEVESIZE (dev);
669 /* Offset inside a block */
670 block_seek = offset - blockstart;
672 if (mtd_type == MTD_NANDFLASH) {
674 * NAND: calculate which blocks we are reading. We have
675 * to read one block at a time to skip bad blocks.
677 blocklen = DEVESIZE (dev);
680 * To calculate the top of the range, we have to use the
681 * global DEVOFFSET (dev), which can be different from offset
683 top_of_range = ((DEVOFFSET(dev) / blocklen) +
684 ENVSECTORS (dev)) * blocklen;
686 /* Limit to one block for the first read */
687 if (readlen > blocklen - block_seek)
688 readlen = blocklen - block_seek;
691 top_of_range = offset + count;
694 /* This only runs once on NOR flash */
695 while (processed < count) {
696 rc = flash_bad_block (fd, mtd_type, &blockstart);
697 if (rc < 0) /* block test failed */
700 if (blockstart + block_seek + readlen > top_of_range) {
701 /* End of range is reached */
703 "Too few good blocks within range\n");
707 if (rc) { /* block is bad */
708 blockstart += blocklen;
713 * If a block is bad, we retry in the next block at the same
714 * offset - see common/env_nand.c::writeenv()
716 lseek (fd, blockstart + block_seek, SEEK_SET);
718 rc = read (fd, buf + processed, readlen);
720 fprintf (stderr, "Read error on %s: %s\n",
721 DEVNAME (dev), strerror (errno));
725 fprintf(stderr, "Read 0x%x bytes at 0x%llx on %s\n",
726 rc, blockstart + block_seek, DEVNAME(dev));
728 processed += readlen;
729 readlen = min (blocklen, count - processed);
731 blockstart += blocklen;
738 * Write count bytes at offset, but stay within ENVSECTORS (dev) sectors of
739 * DEVOFFSET (dev). Similar to the read case above, on NOR and dataflash we
740 * erase and write the whole data at once.
742 static int flash_write_buf (int dev, int fd, void *buf, size_t count,
743 off_t offset, uint8_t mtd_type)
746 struct erase_info_user erase;
747 size_t blocklen; /* length of NAND block / NOR erase sector */
748 size_t erase_len; /* whole area that can be erased - may include
750 size_t erasesize; /* erase / write length - one block on NAND,
752 size_t processed = 0; /* progress counter */
753 size_t write_total; /* total size to actually write - excluding
755 off_t erase_offset; /* offset to the first erase block (aligned)
757 off_t block_seek; /* offset inside the erase block to the start
759 off_t top_of_range; /* end of the last block we may use */
760 loff_t blockstart; /* running start of the current block -
761 MEMGETBADBLOCK needs 64 bits */
765 * For mtd devices only offset and size of the environment do matter
767 if (mtd_type == MTD_ABSENT) {
769 top_of_range = offset + count;
770 erase_len = blocklen;
773 write_total = blocklen;
775 blocklen = DEVESIZE(dev);
777 top_of_range = ((DEVOFFSET(dev) / blocklen) +
778 ENVSECTORS(dev)) * blocklen;
780 erase_offset = (offset / blocklen) * blocklen;
782 /* Maximum area we may use */
783 erase_len = top_of_range - erase_offset;
785 blockstart = erase_offset;
786 /* Offset inside a block */
787 block_seek = offset - erase_offset;
790 * Data size we actually write: from the start of the block
791 * to the start of the data, then count bytes of data, and
792 * to the end of the block
794 write_total = ((block_seek + count + blocklen - 1) /
795 blocklen) * blocklen;
799 * Support data anywhere within erase sectors: read out the complete
800 * area to be erased, replace the environment image, write the whole
803 if (write_total > count) {
804 data = malloc (erase_len);
807 "Cannot malloc %zu bytes: %s\n",
808 erase_len, strerror (errno));
812 rc = flash_read_buf (dev, fd, data, write_total, erase_offset,
814 if (write_total != rc)
818 fprintf(stderr, "Preserving data ");
820 fprintf(stderr, "0x%x - 0x%lx", 0, block_seek - 1);
821 if (block_seek + count != write_total) {
823 fprintf(stderr, " and ");
824 fprintf(stderr, "0x%lx - 0x%x",
825 block_seek + count, write_total - 1);
827 fprintf(stderr, "\n");
829 /* Overwrite the old environment */
830 memcpy (data + block_seek, buf, count);
833 * We get here, iff offset is block-aligned and count is a
834 * multiple of blocklen - see write_total calculation above
839 if (mtd_type == MTD_NANDFLASH) {
841 * NAND: calculate which blocks we are writing. We have
842 * to write one block at a time to skip bad blocks.
844 erasesize = blocklen;
846 erasesize = erase_len;
849 erase.length = erasesize;
851 /* This only runs once on NOR flash and SPI-dataflash */
852 while (processed < write_total) {
853 rc = flash_bad_block (fd, mtd_type, &blockstart);
854 if (rc < 0) /* block test failed */
857 if (blockstart + erasesize > top_of_range) {
858 fprintf (stderr, "End of range reached, aborting\n");
862 if (rc) { /* block is bad */
863 blockstart += blocklen;
867 if (mtd_type != MTD_ABSENT) {
868 erase.start = blockstart;
869 ioctl(fd, MEMUNLOCK, &erase);
870 /* These do not need an explicit erase cycle */
871 if (mtd_type != MTD_DATAFLASH)
872 if (ioctl(fd, MEMERASE, &erase) != 0) {
874 "MTD erase error on %s: %s\n",
875 DEVNAME(dev), strerror(errno));
880 if (lseek (fd, blockstart, SEEK_SET) == -1) {
882 "Seek error on %s: %s\n",
883 DEVNAME (dev), strerror (errno));
888 fprintf(stderr, "Write 0x%x bytes at 0x%llx\n", erasesize,
891 if (write (fd, data + processed, erasesize) != erasesize) {
892 fprintf (stderr, "Write error on %s: %s\n",
893 DEVNAME (dev), strerror (errno));
897 if (mtd_type != MTD_ABSENT)
898 ioctl(fd, MEMLOCK, &erase);
900 processed += erasesize;
902 blockstart += erasesize;
905 if (write_total > count)
912 * Set obsolete flag at offset - NOR flash only
914 static int flash_flag_obsolete (int dev, int fd, off_t offset)
917 struct erase_info_user erase;
919 erase.start = DEVOFFSET (dev);
920 erase.length = DEVESIZE (dev);
921 /* This relies on the fact, that obsolete_flag == 0 */
922 rc = lseek (fd, offset, SEEK_SET);
924 fprintf (stderr, "Cannot seek to set the flag on %s \n",
928 ioctl (fd, MEMUNLOCK, &erase);
929 rc = write (fd, &obsolete_flag, sizeof (obsolete_flag));
930 ioctl (fd, MEMLOCK, &erase);
932 perror ("Could not set obsolete flag");
937 /* Encrypt or decrypt the environment before writing or reading it. */
938 static int env_aes_cbc_crypt(char *payload, const int enc, uint8_t *key)
940 uint8_t *data = (uint8_t *)payload;
941 const int len = usable_envsize;
942 uint8_t key_exp[AES_EXPAND_KEY_LENGTH];
945 /* First we expand the key. */
946 aes_expand_key(key, key_exp);
948 /* Calculate the number of AES blocks to encrypt. */
949 aes_blocks = DIV_ROUND_UP(len, AES_KEY_LENGTH);
952 aes_cbc_encrypt_blocks(key_exp, data, data, aes_blocks);
954 aes_cbc_decrypt_blocks(key_exp, data, data, aes_blocks);
959 static int flash_write (int fd_current, int fd_target, int dev_target)
963 switch (environment.flag_scheme) {
966 case FLAG_INCREMENTAL:
967 (*environment.flags)++;
970 *environment.flags = active_flag;
973 fprintf (stderr, "Unimplemented flash scheme %u \n",
974 environment.flag_scheme);
979 fprintf(stderr, "Writing new environment at 0x%lx on %s\n",
980 DEVOFFSET (dev_target), DEVNAME (dev_target));
983 rc = flash_write_buf(dev_target, fd_target, environment.image,
984 CUR_ENVSIZE, DEVOFFSET(dev_target),
985 DEVTYPE(dev_target));
989 if (environment.flag_scheme == FLAG_BOOLEAN) {
990 /* Have to set obsolete flag */
991 off_t offset = DEVOFFSET (dev_current) +
992 offsetof (struct env_image_redundant, flags);
995 "Setting obsolete flag in environment at 0x%lx on %s\n",
996 DEVOFFSET (dev_current), DEVNAME (dev_current));
998 flash_flag_obsolete (dev_current, fd_current, offset);
1004 static int flash_read (int fd)
1006 struct mtd_info_user mtdinfo;
1010 rc = fstat(fd, &st);
1012 fprintf(stderr, "Cannot stat the file %s\n",
1013 DEVNAME(dev_current));
1017 if (S_ISCHR(st.st_mode)) {
1018 rc = ioctl(fd, MEMGETINFO, &mtdinfo);
1020 fprintf(stderr, "Cannot get MTD information for %s\n",
1021 DEVNAME(dev_current));
1024 if (mtdinfo.type != MTD_NORFLASH &&
1025 mtdinfo.type != MTD_NANDFLASH &&
1026 mtdinfo.type != MTD_DATAFLASH &&
1027 mtdinfo.type != MTD_UBIVOLUME) {
1028 fprintf (stderr, "Unsupported flash type %u on %s\n",
1029 mtdinfo.type, DEVNAME(dev_current));
1033 memset(&mtdinfo, 0, sizeof(mtdinfo));
1034 mtdinfo.type = MTD_ABSENT;
1037 DEVTYPE(dev_current) = mtdinfo.type;
1039 rc = flash_read_buf(dev_current, fd, environment.image, CUR_ENVSIZE,
1040 DEVOFFSET (dev_current), mtdinfo.type);
1041 if (rc != CUR_ENVSIZE)
1047 static int flash_io (int mode)
1049 int fd_current, fd_target, rc, dev_target;
1051 /* dev_current: fd_current, erase_current */
1052 fd_current = open (DEVNAME (dev_current), mode);
1053 if (fd_current < 0) {
1055 "Can't open %s: %s\n",
1056 DEVNAME (dev_current), strerror (errno));
1060 if (mode == O_RDWR) {
1061 if (HaveRedundEnv) {
1062 /* switch to next partition for writing */
1063 dev_target = !dev_current;
1064 /* dev_target: fd_target, erase_target */
1065 fd_target = open (DEVNAME (dev_target), mode);
1066 if (fd_target < 0) {
1068 "Can't open %s: %s\n",
1069 DEVNAME (dev_target),
1075 dev_target = dev_current;
1076 fd_target = fd_current;
1079 rc = flash_write (fd_current, fd_target, dev_target);
1081 if (HaveRedundEnv) {
1082 if (close (fd_target)) {
1084 "I/O error on %s: %s\n",
1085 DEVNAME (dev_target),
1091 rc = flash_read (fd_current);
1095 if (close (fd_current)) {
1097 "I/O error on %s: %s\n",
1098 DEVNAME (dev_current), strerror (errno));
1106 * s1 is either a simple 'name', or a 'name=value' pair.
1107 * s2 is a 'name=value' pair.
1108 * If the names match, return the value of s2, else NULL.
1111 static char *envmatch (char * s1, char * s2)
1113 if (s1 == NULL || s2 == NULL)
1116 while (*s1 == *s2++)
1119 if (*s1 == '\0' && *(s2 - 1) == '=')
1125 * Prevent confusion if running from erased flash memory
1127 int fw_env_open(struct env_opts *opts)
1130 unsigned char flag0;
1134 unsigned char flag1;
1139 struct env_image_single *single;
1140 struct env_image_redundant *redundant;
1142 if (parse_config(opts)) /* should fill envdevices */
1145 addr0 = calloc(1, CUR_ENVSIZE);
1146 if (addr0 == NULL) {
1148 "Not enough memory for environment (%ld bytes)\n",
1153 /* read environment from FLASH to local buffer */
1154 environment.image = addr0;
1156 if (HaveRedundEnv) {
1158 environment.crc = &redundant->crc;
1159 environment.flags = &redundant->flags;
1160 environment.data = redundant->data;
1163 environment.crc = &single->crc;
1164 environment.flags = NULL;
1165 environment.data = single->data;
1169 if (flash_io (O_RDONLY))
1172 crc0 = crc32 (0, (uint8_t *) environment.data, ENV_SIZE);
1174 if (opts->aes_flag) {
1175 ret = env_aes_cbc_crypt(environment.data, 0,
1181 crc0_ok = (crc0 == *environment.crc);
1182 if (!HaveRedundEnv) {
1185 "Warning: Bad CRC, using default environment\n");
1186 memcpy(environment.data, default_environment, sizeof default_environment);
1189 flag0 = *environment.flags;
1192 addr1 = calloc(1, CUR_ENVSIZE);
1193 if (addr1 == NULL) {
1195 "Not enough memory for environment (%ld bytes)\n",
1202 * have to set environment.image for flash_read(), careful -
1203 * other pointers in environment still point inside addr0
1205 environment.image = addr1;
1206 if (flash_io (O_RDONLY))
1209 /* Check flag scheme compatibility */
1210 if (DEVTYPE(dev_current) == MTD_NORFLASH &&
1211 DEVTYPE(!dev_current) == MTD_NORFLASH) {
1212 environment.flag_scheme = FLAG_BOOLEAN;
1213 } else if (DEVTYPE(dev_current) == MTD_NANDFLASH &&
1214 DEVTYPE(!dev_current) == MTD_NANDFLASH) {
1215 environment.flag_scheme = FLAG_INCREMENTAL;
1216 } else if (DEVTYPE(dev_current) == MTD_DATAFLASH &&
1217 DEVTYPE(!dev_current) == MTD_DATAFLASH) {
1218 environment.flag_scheme = FLAG_BOOLEAN;
1219 } else if (DEVTYPE(dev_current) == MTD_UBIVOLUME &&
1220 DEVTYPE(!dev_current) == MTD_UBIVOLUME) {
1221 environment.flag_scheme = FLAG_INCREMENTAL;
1222 } else if (DEVTYPE(dev_current) == MTD_ABSENT &&
1223 DEVTYPE(!dev_current) == MTD_ABSENT) {
1224 environment.flag_scheme = FLAG_INCREMENTAL;
1226 fprintf (stderr, "Incompatible flash types!\n");
1230 crc1 = crc32 (0, (uint8_t *) redundant->data, ENV_SIZE);
1232 if (opts->aes_flag) {
1233 ret = env_aes_cbc_crypt(redundant->data, 0,
1239 crc1_ok = (crc1 == redundant->crc);
1240 flag1 = redundant->flags;
1242 if (crc0_ok && !crc1_ok) {
1244 } else if (!crc0_ok && crc1_ok) {
1246 } else if (!crc0_ok && !crc1_ok) {
1248 "Warning: Bad CRC, using default environment\n");
1249 memcpy (environment.data, default_environment,
1250 sizeof default_environment);
1253 switch (environment.flag_scheme) {
1255 if (flag0 == active_flag &&
1256 flag1 == obsolete_flag) {
1258 } else if (flag0 == obsolete_flag &&
1259 flag1 == active_flag) {
1261 } else if (flag0 == flag1) {
1263 } else if (flag0 == 0xFF) {
1265 } else if (flag1 == 0xFF) {
1271 case FLAG_INCREMENTAL:
1272 if (flag0 == 255 && flag1 == 0)
1274 else if ((flag1 == 255 && flag0 == 0) ||
1277 else /* flag1 > flag0 */
1281 fprintf (stderr, "Unknown flag scheme %u \n",
1282 environment.flag_scheme);
1288 * If we are reading, we don't need the flag and the CRC any
1289 * more, if we are writing, we will re-calculate CRC and update
1290 * flags before writing out
1293 environment.image = addr1;
1294 environment.crc = &redundant->crc;
1295 environment.flags = &redundant->flags;
1296 environment.data = redundant->data;
1299 environment.image = addr0;
1300 /* Other pointers are already set */
1304 fprintf(stderr, "Selected env in %s\n", DEVNAME(dev_current));
1311 static int parse_config(struct env_opts *opts)
1315 #if defined(CONFIG_FILE)
1316 if (!common_args.config_file)
1317 common_args.config_file = CONFIG_FILE;
1319 /* Fills in DEVNAME(), ENVSIZE(), DEVESIZE(). Or don't. */
1320 if (get_config(opts->config_file)) {
1321 fprintf(stderr, "Cannot parse config file '%s': %m\n",
1326 DEVNAME (0) = DEVICE1_NAME;
1327 DEVOFFSET (0) = DEVICE1_OFFSET;
1328 ENVSIZE (0) = ENV1_SIZE;
1329 /* Default values are: erase-size=env-size */
1330 DEVESIZE (0) = ENVSIZE (0);
1331 /* #sectors=env-size/erase-size (rounded up) */
1332 ENVSECTORS (0) = (ENVSIZE(0) + DEVESIZE(0) - 1) / DEVESIZE(0);
1333 #ifdef DEVICE1_ESIZE
1334 DEVESIZE (0) = DEVICE1_ESIZE;
1336 #ifdef DEVICE1_ENVSECTORS
1337 ENVSECTORS (0) = DEVICE1_ENVSECTORS;
1341 DEVNAME (1) = DEVICE2_NAME;
1342 DEVOFFSET (1) = DEVICE2_OFFSET;
1343 ENVSIZE (1) = ENV2_SIZE;
1344 /* Default values are: erase-size=env-size */
1345 DEVESIZE (1) = ENVSIZE (1);
1346 /* #sectors=env-size/erase-size (rounded up) */
1347 ENVSECTORS (1) = (ENVSIZE(1) + DEVESIZE(1) - 1) / DEVESIZE(1);
1348 #ifdef DEVICE2_ESIZE
1349 DEVESIZE (1) = DEVICE2_ESIZE;
1351 #ifdef DEVICE2_ENVSECTORS
1352 ENVSECTORS (1) = DEVICE2_ENVSECTORS;
1357 if (stat (DEVNAME (0), &st)) {
1359 "Cannot access MTD device %s: %s\n",
1360 DEVNAME (0), strerror (errno));
1364 if (HaveRedundEnv && stat (DEVNAME (1), &st)) {
1366 "Cannot access MTD device %s: %s\n",
1367 DEVNAME (1), strerror (errno));
1371 if (HaveRedundEnv && ENVSIZE(0) != ENVSIZE(1)) {
1372 ENVSIZE(0) = ENVSIZE(1) = min(ENVSIZE(0), ENVSIZE(1));
1374 "Redundant environments have inequal size, set to 0x%08lx\n",
1378 usable_envsize = CUR_ENVSIZE - sizeof(uint32_t);
1380 usable_envsize -= sizeof(char);
1383 usable_envsize &= ~(AES_KEY_LENGTH - 1);
1388 #if defined(CONFIG_FILE)
1389 static int get_config (char *fname)
1397 fp = fopen (fname, "r");
1401 while (i < 2 && fgets (dump, sizeof (dump), fp)) {
1402 /* Skip incomplete conversions and comment strings */
1406 rc = sscanf (dump, "%ms %lx %lx %lx %lx",
1416 DEVNAME(i) = devname;
1419 /* Assume the erase size is the same as the env-size */
1420 DEVESIZE(i) = ENVSIZE(i);
1423 /* Assume enough env sectors to cover the environment */
1424 ENVSECTORS (i) = (ENVSIZE(i) + DEVESIZE(i) - 1) / DEVESIZE(i);
1430 HaveRedundEnv = i - 1;
1431 if (!i) { /* No valid entries found */