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 *);
127 static char *config_file = CONFIG_FILE;
129 static inline ulong getenvsize (void)
131 ulong rc = CUR_ENVSIZE - sizeof(uint32_t);
137 rc &= ~(AES_KEY_LENGTH - 1);
142 static char *fw_string_blank(char *s, int noblank)
147 for (i = 0; i < len; i++, s++) {
148 if ((noblank && !WHITESPACE(*s)) ||
149 (!noblank && WHITESPACE(*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 static int parse_aes_key(char *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 aes_key[i] = ul & 0xff;
241 * Print the current definition of one, or more, or all
242 * environment variables
244 int fw_printenv (int argc, char *argv[])
251 if (argc >= 2 && strcmp(argv[1], "-c") == 0) {
254 "## Error: '-c' option requires the config file to use\n");
257 config_file = argv[2];
263 if (argc >= 2 && strcmp(argv[1], "-a") == 0) {
266 "## Error: '-a' option requires AES key\n");
269 rc = parse_aes_key(argv[2]);
279 if (argc == 1) { /* Print all env variables */
280 for (env = environment.data; *env; env = nxt + 1) {
281 for (nxt = env; *nxt; ++nxt) {
282 if (nxt >= &environment.data[ENV_SIZE]) {
283 fprintf (stderr, "## Error: "
284 "environment not terminated\n");
289 printf ("%s\n", env);
294 if (strcmp (argv[1], "-n") == 0) {
299 fprintf (stderr, "## Error: "
300 "`-n' option requires exactly one argument\n");
307 for (i = 1; i < argc; ++i) { /* print single env variables */
308 char *name = argv[i];
311 for (env = environment.data; *env; env = nxt + 1) {
313 for (nxt = env; *nxt; ++nxt) {
314 if (nxt >= &environment.data[ENV_SIZE]) {
315 fprintf (stderr, "## Error: "
316 "environment not terminated\n");
320 val = envmatch (name, env);
323 fputs (name, stdout);
331 fprintf (stderr, "## Error: \"%s\" not defined\n", name);
339 int fw_env_close(void)
343 ret = env_aes_cbc_crypt(environment.data, 1);
346 "Error: can't encrypt env for flash\n");
354 *environment.crc = crc32(0, (uint8_t *) environment.data, ENV_SIZE);
356 /* write environment back to flash */
357 if (flash_io(O_RDWR)) {
359 "Error: can't write fw_env to flash\n");
368 * Set/Clear a single variable in the environment.
369 * This is called in sequence to update the environment
370 * in RAM without updating the copy in flash after each set
372 int fw_env_write(char *name, char *value)
377 int deleting, creating, overwriting;
380 * search if variable with this name already exists
382 for (nxt = env = environment.data; *env; env = nxt + 1) {
383 for (nxt = env; *nxt; ++nxt) {
384 if (nxt >= &environment.data[ENV_SIZE]) {
385 fprintf(stderr, "## Error: "
386 "environment not terminated\n");
391 if ((oldval = envmatch (name, env)) != NULL)
395 deleting = (oldval && !(value && strlen(value)));
396 creating = (!oldval && (value && strlen(value)));
397 overwriting = (oldval && (value && strlen(value)));
399 /* check for permission */
401 if (env_flags_validate_varaccess(name,
402 ENV_FLAGS_VARACCESS_PREVENT_DELETE)) {
403 printf("Can't delete \"%s\"\n", name);
407 } else if (overwriting) {
408 if (env_flags_validate_varaccess(name,
409 ENV_FLAGS_VARACCESS_PREVENT_OVERWR)) {
410 printf("Can't overwrite \"%s\"\n", name);
413 } else if (env_flags_validate_varaccess(name,
414 ENV_FLAGS_VARACCESS_PREVENT_NONDEF_OVERWR)) {
415 const char *defval = fw_getdefenv(name);
419 if (strcmp(oldval, defval)
421 printf("Can't overwrite \"%s\"\n", name);
426 } else if (creating) {
427 if (env_flags_validate_varaccess(name,
428 ENV_FLAGS_VARACCESS_PREVENT_CREATE)) {
429 printf("Can't create \"%s\"\n", name);
437 if (deleting || overwriting) {
438 if (*++nxt == '\0') {
443 if ((*env == '\0') && (*nxt == '\0'))
452 if (!value || !strlen(value))
456 * Append new definition at the end
458 for (env = environment.data; *env || *(env + 1); ++env);
459 if (env > environment.data)
463 * "name" + "=" + "val" +"\0\0" > CUR_ENVSIZE - (env-environment)
465 len = strlen (name) + 2;
466 /* add '=' for first arg, ' ' for all others */
467 len += strlen(value) + 1;
469 if (len > (&environment.data[ENV_SIZE] - env)) {
471 "Error: environment overflow, \"%s\" deleted\n",
476 while ((*env = *name++) != '\0')
479 while ((*++env = *value++) != '\0')
482 /* end is marked with double '\0' */
489 * Deletes or sets environment variables. Returns -1 and sets errno error codes:
491 * EINVAL - need at least 1 argument
492 * EROFS - certain variables ("ethaddr", "serial#") cannot be
493 * modified or deleted
496 int fw_setenv(int argc, char *argv[])
504 if (argc >= 2 && strcmp(argv[1], "-c") == 0) {
507 "## Error: '-c' option requires the config file to use\n");
510 config_file = argv[2];
521 if (strcmp(argv[1], "-a") == 0) {
524 "## Error: '-a' option requires AES key\n");
527 rc = parse_aes_key(argv[2]);
540 fprintf(stderr, "Error: environment not initialized\n");
546 if (env_flags_validate_env_set_params(argc, argv) < 0)
550 for (i = 2; i < argc; ++i) {
552 size_t val_len = strlen(val);
555 value[len - 1] = ' ';
556 value = realloc(value, len + val_len + 1);
559 "Cannot malloc %zu bytes: %s\n",
560 len, strerror(errno));
564 memcpy(value + len, val, val_len);
569 fw_env_write(name, value);
573 return fw_env_close();
577 * Parse a file and configure the u-boot variables.
578 * The script file has a very simple format, as follows:
580 * Each line has a couple with name, value:
581 * <white spaces>variable_name<white spaces>variable_value
583 * Both variable_name and variable_value are interpreted as strings.
584 * Any character after <white spaces> and before ending \r\n is interpreted
585 * as variable's value (no comment allowed on these lines !)
587 * Comments are allowed if the first character in the line is #
589 * Returns -1 and sets errno error codes:
593 int fw_parse_script(char *fname)
596 char dump[1024]; /* Maximum line length in the file */
604 fprintf(stderr, "Error: environment not initialized\n");
608 if (strcmp(fname, "-") == 0)
611 fp = fopen(fname, "r");
613 fprintf(stderr, "I cannot open %s for reading\n",
619 while (fgets(dump, sizeof(dump), fp)) {
624 * Read a whole line from the file. If the line is too long
625 * or is not terminated, reports an error and exit.
627 if (dump[len - 1] != '\n') {
629 "Line %d not corrected terminated or too long\n",
635 /* Drop ending line feed / carriage return */
636 while (len > 0 && (dump[len - 1] == '\n' ||
637 dump[len - 1] == '\r')) {
638 dump[len - 1] = '\0';
642 /* Skip comment or empty lines */
643 if ((len == 0) || dump[0] == '#')
647 * Search for variable's name,
648 * remove leading whitespaces
650 name = fw_string_blank(dump, 1);
654 /* The first white space is the end of variable name */
655 val = fw_string_blank(name, 0);
659 if ((val - name) < len)
660 val = fw_string_blank(val, 1);
666 fprintf(stderr, "Setting %s : %s\n",
667 name, val ? val : " removed");
670 if (env_flags_validate_type(name, val) < 0) {
676 * If there is an error setting a variable,
677 * try to save the environment and returns an error
679 if (fw_env_write(name, val)) {
681 "fw_env_write returns with error : %s\n",
689 /* Close file if not stdin */
690 if (strcmp(fname, "-") != 0)
693 ret |= fw_env_close();
700 * Test for bad block on NAND, just returns 0 on NOR, on NAND:
703 * < 0 - failed to test
705 static int flash_bad_block (int fd, uint8_t mtd_type, loff_t *blockstart)
707 if (mtd_type == MTD_NANDFLASH) {
708 int badblock = ioctl (fd, MEMGETBADBLOCK, blockstart);
711 perror ("Cannot read bad block mark");
717 fprintf (stderr, "Bad block at 0x%llx, "
718 "skipping\n", *blockstart);
728 * Read data from flash at an offset into a provided buffer. On NAND it skips
729 * bad blocks but makes sure it stays within ENVSECTORS (dev) starting from
730 * the DEVOFFSET (dev) block. On NOR the loop is only run once.
732 static int flash_read_buf (int dev, int fd, void *buf, size_t count,
733 off_t offset, uint8_t mtd_type)
735 size_t blocklen; /* erase / write length - one block on NAND,
737 size_t processed = 0; /* progress counter */
738 size_t readlen = count; /* current read length */
739 off_t top_of_range; /* end of the last block we may use */
740 off_t block_seek; /* offset inside the current block to the start
742 loff_t blockstart; /* running start of the current block -
743 MEMGETBADBLOCK needs 64 bits */
746 blockstart = (offset / DEVESIZE (dev)) * DEVESIZE (dev);
748 /* Offset inside a block */
749 block_seek = offset - blockstart;
751 if (mtd_type == MTD_NANDFLASH) {
753 * NAND: calculate which blocks we are reading. We have
754 * to read one block at a time to skip bad blocks.
756 blocklen = DEVESIZE (dev);
759 * To calculate the top of the range, we have to use the
760 * global DEVOFFSET (dev), which can be different from offset
762 top_of_range = ((DEVOFFSET(dev) / blocklen) +
763 ENVSECTORS (dev)) * blocklen;
765 /* Limit to one block for the first read */
766 if (readlen > blocklen - block_seek)
767 readlen = blocklen - block_seek;
770 top_of_range = offset + count;
773 /* This only runs once on NOR flash */
774 while (processed < count) {
775 rc = flash_bad_block (fd, mtd_type, &blockstart);
776 if (rc < 0) /* block test failed */
779 if (blockstart + block_seek + readlen > top_of_range) {
780 /* End of range is reached */
782 "Too few good blocks within range\n");
786 if (rc) { /* block is bad */
787 blockstart += blocklen;
792 * If a block is bad, we retry in the next block at the same
793 * offset - see common/env_nand.c::writeenv()
795 lseek (fd, blockstart + block_seek, SEEK_SET);
797 rc = read (fd, buf + processed, readlen);
799 fprintf (stderr, "Read error on %s: %s\n",
800 DEVNAME (dev), strerror (errno));
804 fprintf(stderr, "Read 0x%x bytes at 0x%llx on %s\n",
805 rc, blockstart + block_seek, DEVNAME(dev));
807 processed += readlen;
808 readlen = min (blocklen, count - processed);
810 blockstart += blocklen;
817 * Write count bytes at offset, but stay within ENVSECTORS (dev) sectors of
818 * DEVOFFSET (dev). Similar to the read case above, on NOR and dataflash we
819 * erase and write the whole data at once.
821 static int flash_write_buf (int dev, int fd, void *buf, size_t count,
822 off_t offset, uint8_t mtd_type)
825 struct erase_info_user erase;
826 size_t blocklen; /* length of NAND block / NOR erase sector */
827 size_t erase_len; /* whole area that can be erased - may include
829 size_t erasesize; /* erase / write length - one block on NAND,
831 size_t processed = 0; /* progress counter */
832 size_t write_total; /* total size to actually write - excluding
834 off_t erase_offset; /* offset to the first erase block (aligned)
836 off_t block_seek; /* offset inside the erase block to the start
838 off_t top_of_range; /* end of the last block we may use */
839 loff_t blockstart; /* running start of the current block -
840 MEMGETBADBLOCK needs 64 bits */
844 * For mtd devices only offset and size of the environment do matter
846 if (mtd_type == MTD_ABSENT) {
848 top_of_range = offset + count;
849 erase_len = blocklen;
852 write_total = blocklen;
854 blocklen = DEVESIZE(dev);
856 top_of_range = ((DEVOFFSET(dev) / blocklen) +
857 ENVSECTORS(dev)) * blocklen;
859 erase_offset = (offset / blocklen) * blocklen;
861 /* Maximum area we may use */
862 erase_len = top_of_range - erase_offset;
864 blockstart = erase_offset;
865 /* Offset inside a block */
866 block_seek = offset - erase_offset;
869 * Data size we actually write: from the start of the block
870 * to the start of the data, then count bytes of data, and
871 * to the end of the block
873 write_total = ((block_seek + count + blocklen - 1) /
874 blocklen) * blocklen;
878 * Support data anywhere within erase sectors: read out the complete
879 * area to be erased, replace the environment image, write the whole
882 if (write_total > count) {
883 data = malloc (erase_len);
886 "Cannot malloc %zu bytes: %s\n",
887 erase_len, strerror (errno));
891 rc = flash_read_buf (dev, fd, data, write_total, erase_offset,
893 if (write_total != rc)
897 fprintf(stderr, "Preserving data ");
899 fprintf(stderr, "0x%x - 0x%lx", 0, block_seek - 1);
900 if (block_seek + count != write_total) {
902 fprintf(stderr, " and ");
903 fprintf(stderr, "0x%lx - 0x%x",
904 block_seek + count, write_total - 1);
906 fprintf(stderr, "\n");
908 /* Overwrite the old environment */
909 memcpy (data + block_seek, buf, count);
912 * We get here, iff offset is block-aligned and count is a
913 * multiple of blocklen - see write_total calculation above
918 if (mtd_type == MTD_NANDFLASH) {
920 * NAND: calculate which blocks we are writing. We have
921 * to write one block at a time to skip bad blocks.
923 erasesize = blocklen;
925 erasesize = erase_len;
928 erase.length = erasesize;
930 /* This only runs once on NOR flash and SPI-dataflash */
931 while (processed < write_total) {
932 rc = flash_bad_block (fd, mtd_type, &blockstart);
933 if (rc < 0) /* block test failed */
936 if (blockstart + erasesize > top_of_range) {
937 fprintf (stderr, "End of range reached, aborting\n");
941 if (rc) { /* block is bad */
942 blockstart += blocklen;
946 if (mtd_type != MTD_ABSENT) {
947 erase.start = blockstart;
948 ioctl(fd, MEMUNLOCK, &erase);
949 /* These do not need an explicit erase cycle */
950 if (mtd_type != MTD_DATAFLASH)
951 if (ioctl(fd, MEMERASE, &erase) != 0) {
953 "MTD erase error on %s: %s\n",
954 DEVNAME(dev), strerror(errno));
959 if (lseek (fd, blockstart, SEEK_SET) == -1) {
961 "Seek error on %s: %s\n",
962 DEVNAME (dev), strerror (errno));
967 fprintf(stderr, "Write 0x%x bytes at 0x%llx\n", erasesize,
970 if (write (fd, data + processed, erasesize) != erasesize) {
971 fprintf (stderr, "Write error on %s: %s\n",
972 DEVNAME (dev), strerror (errno));
976 if (mtd_type != MTD_ABSENT)
977 ioctl(fd, MEMLOCK, &erase);
979 processed += erasesize;
981 blockstart += erasesize;
984 if (write_total > count)
991 * Set obsolete flag at offset - NOR flash only
993 static int flash_flag_obsolete (int dev, int fd, off_t offset)
996 struct erase_info_user erase;
998 erase.start = DEVOFFSET (dev);
999 erase.length = DEVESIZE (dev);
1000 /* This relies on the fact, that obsolete_flag == 0 */
1001 rc = lseek (fd, offset, SEEK_SET);
1003 fprintf (stderr, "Cannot seek to set the flag on %s \n",
1007 ioctl (fd, MEMUNLOCK, &erase);
1008 rc = write (fd, &obsolete_flag, sizeof (obsolete_flag));
1009 ioctl (fd, MEMLOCK, &erase);
1011 perror ("Could not set obsolete flag");
1016 /* Encrypt or decrypt the environment before writing or reading it. */
1017 static int env_aes_cbc_crypt(char *payload, const int enc)
1019 uint8_t *data = (uint8_t *)payload;
1020 const int len = getenvsize();
1021 uint8_t key_exp[AES_EXPAND_KEY_LENGTH];
1022 uint32_t aes_blocks;
1024 /* First we expand the key. */
1025 aes_expand_key(aes_key, key_exp);
1027 /* Calculate the number of AES blocks to encrypt. */
1028 aes_blocks = DIV_ROUND_UP(len, AES_KEY_LENGTH);
1031 aes_cbc_encrypt_blocks(key_exp, data, data, aes_blocks);
1033 aes_cbc_decrypt_blocks(key_exp, data, data, aes_blocks);
1038 static int flash_write (int fd_current, int fd_target, int dev_target)
1042 switch (environment.flag_scheme) {
1045 case FLAG_INCREMENTAL:
1046 (*environment.flags)++;
1049 *environment.flags = active_flag;
1052 fprintf (stderr, "Unimplemented flash scheme %u \n",
1053 environment.flag_scheme);
1058 fprintf(stderr, "Writing new environment at 0x%lx on %s\n",
1059 DEVOFFSET (dev_target), DEVNAME (dev_target));
1062 rc = flash_write_buf(dev_target, fd_target, environment.image,
1063 CUR_ENVSIZE, DEVOFFSET(dev_target),
1064 DEVTYPE(dev_target));
1068 if (environment.flag_scheme == FLAG_BOOLEAN) {
1069 /* Have to set obsolete flag */
1070 off_t offset = DEVOFFSET (dev_current) +
1071 offsetof (struct env_image_redundant, flags);
1074 "Setting obsolete flag in environment at 0x%lx on %s\n",
1075 DEVOFFSET (dev_current), DEVNAME (dev_current));
1077 flash_flag_obsolete (dev_current, fd_current, offset);
1083 static int flash_read (int fd)
1085 struct mtd_info_user mtdinfo;
1089 rc = fstat(fd, &st);
1091 fprintf(stderr, "Cannot stat the file %s\n",
1092 DEVNAME(dev_current));
1096 if (S_ISCHR(st.st_mode)) {
1097 rc = ioctl(fd, MEMGETINFO, &mtdinfo);
1099 fprintf(stderr, "Cannot get MTD information for %s\n",
1100 DEVNAME(dev_current));
1103 if (mtdinfo.type != MTD_NORFLASH &&
1104 mtdinfo.type != MTD_NANDFLASH &&
1105 mtdinfo.type != MTD_DATAFLASH &&
1106 mtdinfo.type != MTD_UBIVOLUME) {
1107 fprintf (stderr, "Unsupported flash type %u on %s\n",
1108 mtdinfo.type, DEVNAME(dev_current));
1112 memset(&mtdinfo, 0, sizeof(mtdinfo));
1113 mtdinfo.type = MTD_ABSENT;
1116 DEVTYPE(dev_current) = mtdinfo.type;
1118 rc = flash_read_buf(dev_current, fd, environment.image, CUR_ENVSIZE,
1119 DEVOFFSET (dev_current), mtdinfo.type);
1120 if (rc != CUR_ENVSIZE)
1126 static int flash_io (int mode)
1128 int fd_current, fd_target, rc, dev_target;
1130 /* dev_current: fd_current, erase_current */
1131 fd_current = open (DEVNAME (dev_current), mode);
1132 if (fd_current < 0) {
1134 "Can't open %s: %s\n",
1135 DEVNAME (dev_current), strerror (errno));
1139 if (mode == O_RDWR) {
1140 if (HaveRedundEnv) {
1141 /* switch to next partition for writing */
1142 dev_target = !dev_current;
1143 /* dev_target: fd_target, erase_target */
1144 fd_target = open (DEVNAME (dev_target), mode);
1145 if (fd_target < 0) {
1147 "Can't open %s: %s\n",
1148 DEVNAME (dev_target),
1154 dev_target = dev_current;
1155 fd_target = fd_current;
1158 rc = flash_write (fd_current, fd_target, dev_target);
1160 if (HaveRedundEnv) {
1161 if (close (fd_target)) {
1163 "I/O error on %s: %s\n",
1164 DEVNAME (dev_target),
1170 rc = flash_read (fd_current);
1174 if (close (fd_current)) {
1176 "I/O error on %s: %s\n",
1177 DEVNAME (dev_current), strerror (errno));
1185 * s1 is either a simple 'name', or a 'name=value' pair.
1186 * s2 is a 'name=value' pair.
1187 * If the names match, return the value of s2, else NULL.
1190 static char *envmatch (char * s1, char * s2)
1192 if (s1 == NULL || s2 == NULL)
1195 while (*s1 == *s2++)
1198 if (*s1 == '\0' && *(s2 - 1) == '=')
1204 * Prevent confusion if running from erased flash memory
1206 int fw_env_open(void)
1209 unsigned char flag0;
1213 unsigned char flag1;
1218 struct env_image_single *single;
1219 struct env_image_redundant *redundant;
1221 if (parse_config ()) /* should fill envdevices */
1224 addr0 = calloc(1, CUR_ENVSIZE);
1225 if (addr0 == NULL) {
1227 "Not enough memory for environment (%ld bytes)\n",
1232 /* read environment from FLASH to local buffer */
1233 environment.image = addr0;
1235 if (HaveRedundEnv) {
1237 environment.crc = &redundant->crc;
1238 environment.flags = &redundant->flags;
1239 environment.data = redundant->data;
1242 environment.crc = &single->crc;
1243 environment.flags = NULL;
1244 environment.data = single->data;
1248 if (flash_io (O_RDONLY))
1251 crc0 = crc32 (0, (uint8_t *) environment.data, ENV_SIZE);
1254 ret = env_aes_cbc_crypt(environment.data, 0);
1259 crc0_ok = (crc0 == *environment.crc);
1260 if (!HaveRedundEnv) {
1263 "Warning: Bad CRC, using default environment\n");
1264 memcpy(environment.data, default_environment, sizeof default_environment);
1267 flag0 = *environment.flags;
1270 addr1 = calloc(1, CUR_ENVSIZE);
1271 if (addr1 == NULL) {
1273 "Not enough memory for environment (%ld bytes)\n",
1280 * have to set environment.image for flash_read(), careful -
1281 * other pointers in environment still point inside addr0
1283 environment.image = addr1;
1284 if (flash_io (O_RDONLY))
1287 /* Check flag scheme compatibility */
1288 if (DEVTYPE(dev_current) == MTD_NORFLASH &&
1289 DEVTYPE(!dev_current) == MTD_NORFLASH) {
1290 environment.flag_scheme = FLAG_BOOLEAN;
1291 } else if (DEVTYPE(dev_current) == MTD_NANDFLASH &&
1292 DEVTYPE(!dev_current) == MTD_NANDFLASH) {
1293 environment.flag_scheme = FLAG_INCREMENTAL;
1294 } else if (DEVTYPE(dev_current) == MTD_DATAFLASH &&
1295 DEVTYPE(!dev_current) == MTD_DATAFLASH) {
1296 environment.flag_scheme = FLAG_BOOLEAN;
1297 } else if (DEVTYPE(dev_current) == MTD_UBIVOLUME &&
1298 DEVTYPE(!dev_current) == MTD_UBIVOLUME) {
1299 environment.flag_scheme = FLAG_INCREMENTAL;
1300 } else if (DEVTYPE(dev_current) == MTD_ABSENT &&
1301 DEVTYPE(!dev_current) == MTD_ABSENT) {
1302 environment.flag_scheme = FLAG_INCREMENTAL;
1304 fprintf (stderr, "Incompatible flash types!\n");
1308 crc1 = crc32 (0, (uint8_t *) redundant->data, ENV_SIZE);
1311 ret = env_aes_cbc_crypt(redundant->data, 0);
1316 crc1_ok = (crc1 == redundant->crc);
1317 flag1 = redundant->flags;
1319 if (crc0_ok && !crc1_ok) {
1321 } else if (!crc0_ok && crc1_ok) {
1323 } else if (!crc0_ok && !crc1_ok) {
1325 "Warning: Bad CRC, using default environment\n");
1326 memcpy (environment.data, default_environment,
1327 sizeof default_environment);
1330 switch (environment.flag_scheme) {
1332 if (flag0 == active_flag &&
1333 flag1 == obsolete_flag) {
1335 } else if (flag0 == obsolete_flag &&
1336 flag1 == active_flag) {
1338 } else if (flag0 == flag1) {
1340 } else if (flag0 == 0xFF) {
1342 } else if (flag1 == 0xFF) {
1348 case FLAG_INCREMENTAL:
1349 if (flag0 == 255 && flag1 == 0)
1351 else if ((flag1 == 255 && flag0 == 0) ||
1354 else /* flag1 > flag0 */
1358 fprintf (stderr, "Unknown flag scheme %u \n",
1359 environment.flag_scheme);
1365 * If we are reading, we don't need the flag and the CRC any
1366 * more, if we are writing, we will re-calculate CRC and update
1367 * flags before writing out
1370 environment.image = addr1;
1371 environment.crc = &redundant->crc;
1372 environment.flags = &redundant->flags;
1373 environment.data = redundant->data;
1376 environment.image = addr0;
1377 /* Other pointers are already set */
1381 fprintf(stderr, "Selected env in %s\n", DEVNAME(dev_current));
1388 static int parse_config ()
1392 #if defined(CONFIG_FILE)
1393 /* Fills in DEVNAME(), ENVSIZE(), DEVESIZE(). Or don't. */
1394 if (get_config (config_file)) {
1396 "Cannot parse config file '%s': %s\n", config_file, strerror (errno));
1400 DEVNAME (0) = DEVICE1_NAME;
1401 DEVOFFSET (0) = DEVICE1_OFFSET;
1402 ENVSIZE (0) = ENV1_SIZE;
1403 /* Default values are: erase-size=env-size */
1404 DEVESIZE (0) = ENVSIZE (0);
1405 /* #sectors=env-size/erase-size (rounded up) */
1406 ENVSECTORS (0) = (ENVSIZE(0) + DEVESIZE(0) - 1) / DEVESIZE(0);
1407 #ifdef DEVICE1_ESIZE
1408 DEVESIZE (0) = DEVICE1_ESIZE;
1410 #ifdef DEVICE1_ENVSECTORS
1411 ENVSECTORS (0) = DEVICE1_ENVSECTORS;
1415 DEVNAME (1) = DEVICE2_NAME;
1416 DEVOFFSET (1) = DEVICE2_OFFSET;
1417 ENVSIZE (1) = ENV2_SIZE;
1418 /* Default values are: erase-size=env-size */
1419 DEVESIZE (1) = ENVSIZE (1);
1420 /* #sectors=env-size/erase-size (rounded up) */
1421 ENVSECTORS (1) = (ENVSIZE(1) + DEVESIZE(1) - 1) / DEVESIZE(1);
1422 #ifdef DEVICE2_ESIZE
1423 DEVESIZE (1) = DEVICE2_ESIZE;
1425 #ifdef DEVICE2_ENVSECTORS
1426 ENVSECTORS (1) = DEVICE2_ENVSECTORS;
1431 if (stat (DEVNAME (0), &st)) {
1433 "Cannot access MTD device %s: %s\n",
1434 DEVNAME (0), strerror (errno));
1438 if (HaveRedundEnv && stat (DEVNAME (1), &st)) {
1440 "Cannot access MTD device %s: %s\n",
1441 DEVNAME (1), strerror (errno));
1447 #if defined(CONFIG_FILE)
1448 static int get_config (char *fname)
1456 fp = fopen (fname, "r");
1460 while (i < 2 && fgets (dump, sizeof (dump), fp)) {
1461 /* Skip incomplete conversions and comment strings */
1465 rc = sscanf (dump, "%ms %lx %lx %lx %lx",
1475 DEVNAME(i) = devname;
1478 /* Assume the erase size is the same as the env-size */
1479 DEVESIZE(i) = ENVSIZE(i);
1482 /* Assume enough env sectors to cover the environment */
1483 ENVSECTORS (i) = (ENVSIZE(i) + DEVESIZE(i) - 1) / DEVESIZE(i);
1489 HaveRedundEnv = i - 1;
1490 if (!i) { /* No valid entries found */