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>
18 #include <linux/stringify.h>
24 #include <sys/types.h>
25 #include <sys/ioctl.h>
31 # include <linux/mtd/mtd.h>
33 # define __user /* nothing */
34 # include <mtd/mtd-user.h>
37 #include "fw_env_private.h"
40 struct env_opts default_opts = {
42 .config_file = CONFIG_FILE
46 #define DIV_ROUND_UP(n, d) (((n) + (d) - 1) / (d))
48 #define min(x, y) ({ \
49 typeof(x) _min1 = (x); \
50 typeof(y) _min2 = (y); \
51 (void) (&_min1 == &_min2); \
52 _min1 < _min2 ? _min1 : _min2; })
55 const char *devname; /* Device name */
56 long long devoff; /* Device offset */
57 ulong env_size; /* environment size */
58 ulong erase_size; /* device erase size */
59 ulong env_sectors; /* number of environment sectors */
60 uint8_t mtd_type; /* type of the MTD device */
63 static struct envdev_s envdevices[2] =
66 .mtd_type = MTD_ABSENT,
68 .mtd_type = MTD_ABSENT,
71 static int dev_current;
73 #define DEVNAME(i) envdevices[(i)].devname
74 #define DEVOFFSET(i) envdevices[(i)].devoff
75 #define ENVSIZE(i) envdevices[(i)].env_size
76 #define DEVESIZE(i) envdevices[(i)].erase_size
77 #define ENVSECTORS(i) envdevices[(i)].env_sectors
78 #define DEVTYPE(i) envdevices[(i)].mtd_type
80 #define CUR_ENVSIZE ENVSIZE(dev_current)
82 static unsigned long usable_envsize;
83 #define ENV_SIZE usable_envsize
85 struct env_image_single {
86 uint32_t crc; /* CRC32 over data bytes */
90 struct env_image_redundant {
91 uint32_t crc; /* CRC32 over data bytes */
92 unsigned char flags; /* active or obsolete */
105 unsigned char *flags;
107 enum flag_scheme flag_scheme;
110 static struct environment environment = {
111 .flag_scheme = FLAG_NONE,
114 static int env_aes_cbc_crypt(char *data, const int enc, uint8_t *key);
116 static int HaveRedundEnv = 0;
118 static unsigned char active_flag = 1;
119 /* obsolete_flag must be 0 to efficiently set it on NOR flash without erasing */
120 static unsigned char obsolete_flag = 0;
122 #define DEFAULT_ENV_INSTANCE_STATIC
123 #include <env_default.h>
125 static int flash_io (int mode);
126 static int parse_config(struct env_opts *opts);
128 #if defined(CONFIG_FILE)
129 static int get_config (char *);
132 static char *skip_chars(char *s)
134 for (; *s != '\0'; s++) {
141 static char *skip_blanks(char *s)
143 for (; *s != '\0'; s++) {
151 * s1 is either a simple 'name', or a 'name=value' pair.
152 * s2 is a 'name=value' pair.
153 * If the names match, return the value of s2, else NULL.
155 static char *envmatch(char *s1, char *s2)
157 if (s1 == NULL || s2 == NULL)
163 if (*s1 == '\0' && *(s2 - 1) == '=')
169 * Search the environment for a variable.
170 * Return the value, if found, or NULL, if not found.
172 char *fw_getenv (char *name)
176 for (env = environment.data; *env; env = nxt + 1) {
179 for (nxt = env; *nxt; ++nxt) {
180 if (nxt >= &environment.data[ENV_SIZE]) {
181 fprintf (stderr, "## Error: "
182 "environment not terminated\n");
186 val = envmatch (name, env);
195 * Search the default environment for a variable.
196 * Return the value, if found, or NULL, if not found.
198 char *fw_getdefenv(char *name)
202 for (env = default_environment; *env; env = nxt + 1) {
205 for (nxt = env; *nxt; ++nxt) {
206 if (nxt >= &default_environment[ENV_SIZE]) {
207 fprintf(stderr, "## Error: "
208 "default environment not terminated\n");
212 val = envmatch(name, env);
220 int parse_aes_key(char *key, uint8_t *bin_key)
222 char tmp[5] = { '0', 'x', 0, 0, 0 };
226 if (strnlen(key, 64) != 32) {
228 "## Error: '-a' option requires 16-byte AES key\n");
232 for (i = 0; i < 16; i++) {
236 ul = strtoul(tmp, NULL, 16);
239 "## Error: '-a' option requires valid AES key\n");
242 bin_key[i] = ul & 0xff;
249 * Print the current definition of one, or more, or all
250 * environment variables
252 int fw_printenv(int argc, char *argv[], int value_only, struct env_opts *opts)
256 if (value_only && argc != 1) {
258 "## Error: `-n' option requires exactly one argument\n");
263 opts = &default_opts;
265 if (fw_env_open(opts))
268 if (argc == 0) { /* Print all env variables */
270 for (env = environment.data; *env; env = nxt + 1) {
271 for (nxt = env; *nxt; ++nxt) {
272 if (nxt >= &environment.data[ENV_SIZE]) {
273 fprintf (stderr, "## Error: "
274 "environment not terminated\n");
279 printf ("%s\n", env);
285 for (i = 0; i < argc; ++i) { /* print a subset of env variables */
286 char *name = argv[i];
289 val = fw_getenv(name);
291 fprintf (stderr, "## Error: \"%s\" not defined\n", name);
301 printf("%s=%s\n", name, val);
309 int fw_env_flush(struct env_opts *opts)
314 opts = &default_opts;
316 if (opts->aes_flag) {
317 ret = env_aes_cbc_crypt(environment.data, 1,
321 "Error: can't encrypt env for flash\n");
329 *environment.crc = crc32(0, (uint8_t *) environment.data, ENV_SIZE);
331 /* write environment back to flash */
332 if (flash_io(O_RDWR)) {
334 "Error: can't write fw_env to flash\n");
343 * Set/Clear a single variable in the environment.
344 * This is called in sequence to update the environment
345 * in RAM without updating the copy in flash after each set
347 int fw_env_write(char *name, char *value)
352 int deleting, creating, overwriting;
355 * search if variable with this name already exists
357 for (nxt = env = environment.data; *env; env = nxt + 1) {
358 for (nxt = env; *nxt; ++nxt) {
359 if (nxt >= &environment.data[ENV_SIZE]) {
360 fprintf(stderr, "## Error: "
361 "environment not terminated\n");
366 if ((oldval = envmatch (name, env)) != NULL)
370 deleting = (oldval && !(value && strlen(value)));
371 creating = (!oldval && (value && strlen(value)));
372 overwriting = (oldval && (value && strlen(value)));
374 /* check for permission */
376 if (env_flags_validate_varaccess(name,
377 ENV_FLAGS_VARACCESS_PREVENT_DELETE)) {
378 printf("Can't delete \"%s\"\n", name);
382 } else if (overwriting) {
383 if (env_flags_validate_varaccess(name,
384 ENV_FLAGS_VARACCESS_PREVENT_OVERWR)) {
385 printf("Can't overwrite \"%s\"\n", name);
388 } else if (env_flags_validate_varaccess(name,
389 ENV_FLAGS_VARACCESS_PREVENT_NONDEF_OVERWR)) {
390 const char *defval = fw_getdefenv(name);
394 if (strcmp(oldval, defval)
396 printf("Can't overwrite \"%s\"\n", name);
401 } else if (creating) {
402 if (env_flags_validate_varaccess(name,
403 ENV_FLAGS_VARACCESS_PREVENT_CREATE)) {
404 printf("Can't create \"%s\"\n", name);
412 if (deleting || overwriting) {
413 if (*++nxt == '\0') {
418 if ((*env == '\0') && (*nxt == '\0'))
427 if (!value || !strlen(value))
431 * Append new definition at the end
433 for (env = environment.data; *env || *(env + 1); ++env);
434 if (env > environment.data)
438 * "name" + "=" + "val" +"\0\0" > CUR_ENVSIZE - (env-environment)
440 len = strlen (name) + 2;
441 /* add '=' for first arg, ' ' for all others */
442 len += strlen(value) + 1;
444 if (len > (&environment.data[ENV_SIZE] - env)) {
446 "Error: environment overflow, \"%s\" deleted\n",
451 while ((*env = *name++) != '\0')
454 while ((*++env = *value++) != '\0')
457 /* end is marked with double '\0' */
464 * Deletes or sets environment variables. Returns -1 and sets errno error codes:
466 * EINVAL - need at least 1 argument
467 * EROFS - certain variables ("ethaddr", "serial#") cannot be
468 * modified or deleted
471 int fw_env_set(int argc, char *argv[], struct env_opts *opts)
482 opts = &default_opts;
485 fprintf(stderr, "## Error: variable name missing\n");
490 if (fw_env_open(opts)) {
491 fprintf(stderr, "Error: environment not initialized\n");
499 if (env_flags_validate_env_set_params(name, valv, valc) < 0) {
505 for (i = 0; i < valc; ++i) {
507 size_t val_len = strlen(val);
510 value[len - 1] = ' ';
512 value = realloc(value, len + val_len + 1);
515 "Cannot malloc %zu bytes: %s\n",
516 len, strerror(errno));
521 memcpy(value + len, val, val_len);
526 fw_env_write(name, value);
530 ret = fw_env_flush(opts);
537 * Parse a file and configure the u-boot variables.
538 * The script file has a very simple format, as follows:
540 * Each line has a couple with name, value:
541 * <white spaces>variable_name<white spaces>variable_value
543 * Both variable_name and variable_value are interpreted as strings.
544 * Any character after <white spaces> and before ending \r\n is interpreted
545 * as variable's value (no comment allowed on these lines !)
547 * Comments are allowed if the first character in the line is #
549 * Returns -1 and sets errno error codes:
553 int fw_parse_script(char *fname, struct env_opts *opts)
556 char dump[1024]; /* Maximum line length in the file */
564 opts = &default_opts;
566 if (fw_env_open(opts)) {
567 fprintf(stderr, "Error: environment not initialized\n");
571 if (strcmp(fname, "-") == 0)
574 fp = fopen(fname, "r");
576 fprintf(stderr, "I cannot open %s for reading\n",
582 while (fgets(dump, sizeof(dump), fp)) {
587 * Read a whole line from the file. If the line is too long
588 * or is not terminated, reports an error and exit.
590 if (dump[len - 1] != '\n') {
592 "Line %d not corrected terminated or too long\n",
598 /* Drop ending line feed / carriage return */
600 if (len && dump[len - 1] == '\r')
603 /* Skip comment or empty lines */
604 if (len == 0 || dump[0] == '#')
608 * Search for variable's name,
609 * remove leading whitespaces
611 name = skip_blanks(dump);
615 /* The first white space is the end of variable name */
616 val = skip_chars(name);
620 if ((val - name) < len)
621 val = skip_blanks(val);
627 fprintf(stderr, "Setting %s : %s\n",
628 name, val ? val : " removed");
631 if (env_flags_validate_type(name, val) < 0) {
637 * If there is an error setting a variable,
638 * try to save the environment and returns an error
640 if (fw_env_write(name, val)) {
642 "fw_env_write returns with error : %s\n",
650 /* Close file if not stdin */
651 if (strcmp(fname, "-") != 0)
654 ret |= fw_env_flush(opts);
662 * environment_end() - compute offset of first byte right after environemnt
663 * @dev - index of enviroment buffer
665 * device offset of first byte right after environemnt
667 off_t environment_end(int dev)
669 /* environment is block aligned */
670 return DEVOFFSET(dev) + ENVSECTORS(dev) * DEVESIZE(dev);
674 * Test for bad block on NAND, just returns 0 on NOR, on NAND:
677 * < 0 - failed to test
679 static int flash_bad_block(int fd, uint8_t mtd_type, loff_t blockstart)
681 if (mtd_type == MTD_NANDFLASH) {
682 int badblock = ioctl(fd, MEMGETBADBLOCK, &blockstart);
685 perror ("Cannot read bad block mark");
691 fprintf (stderr, "Bad block at 0x%llx, skipping\n",
692 (unsigned long long)blockstart);
702 * Read data from flash at an offset into a provided buffer. On NAND it skips
703 * bad blocks but makes sure it stays within ENVSECTORS (dev) starting from
704 * the DEVOFFSET (dev) block. On NOR the loop is only run once.
706 static int flash_read_buf (int dev, int fd, void *buf, size_t count,
709 size_t blocklen; /* erase / write length - one block on NAND,
711 size_t processed = 0; /* progress counter */
712 size_t readlen = count; /* current read length */
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 (DEVTYPE(dev) == 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);
731 /* Limit to one block for the first read */
732 if (readlen > blocklen - block_seek)
733 readlen = blocklen - block_seek;
738 /* This only runs once on NOR flash */
739 while (processed < count) {
740 rc = flash_bad_block(fd, DEVTYPE(dev), blockstart);
741 if (rc < 0) /* block test failed */
744 if (blockstart + block_seek + readlen > environment_end(dev)) {
745 /* End of range is reached */
747 "Too few good blocks within range\n");
751 if (rc) { /* block is bad */
752 blockstart += blocklen;
757 * If a block is bad, we retry in the next block at the same
758 * offset - see common/env_nand.c::writeenv()
760 lseek (fd, blockstart + block_seek, SEEK_SET);
762 rc = read (fd, buf + processed, readlen);
764 fprintf (stderr, "Read error on %s: %s\n",
765 DEVNAME (dev), strerror (errno));
769 fprintf(stderr, "Read 0x%x bytes at 0x%llx on %s\n",
770 rc, (unsigned long long) blockstart + block_seek,
773 processed += readlen;
774 readlen = min (blocklen, count - processed);
776 blockstart += blocklen;
783 * Write count bytes from begin of environment, but stay within
784 * ENVSECTORS(dev) sectors of
785 * DEVOFFSET (dev). Similar to the read case above, on NOR and dataflash we
786 * erase and write the whole data at once.
788 static int flash_write_buf(int dev, int fd, void *buf, size_t count)
791 struct erase_info_user erase;
792 size_t blocklen; /* length of NAND block / NOR erase sector */
793 size_t erase_len; /* whole area that can be erased - may include
795 size_t erasesize; /* erase / write length - one block on NAND,
797 size_t processed = 0; /* progress counter */
798 size_t write_total; /* total size to actually write - excluding
800 off_t erase_offset; /* offset to the first erase block (aligned)
802 off_t block_seek; /* offset inside the erase block to the start
804 loff_t blockstart; /* running start of the current block -
805 MEMGETBADBLOCK needs 64 bits */
809 * For mtd devices only offset and size of the environment do matter
811 if (DEVTYPE(dev) == MTD_ABSENT) {
813 erase_len = blocklen;
814 blockstart = DEVOFFSET(dev);
816 write_total = blocklen;
818 blocklen = DEVESIZE(dev);
820 erase_offset = DEVOFFSET(dev);
822 /* Maximum area we may use */
823 erase_len = environment_end(dev) - erase_offset;
825 blockstart = erase_offset;
827 /* Offset inside a block */
828 block_seek = DEVOFFSET(dev) - erase_offset;
831 * Data size we actually write: from the start of the block
832 * to the start of the data, then count bytes of data, and
833 * to the end of the block
835 write_total = ((block_seek + count + blocklen - 1) /
836 blocklen) * blocklen;
840 * Support data anywhere within erase sectors: read out the complete
841 * area to be erased, replace the environment image, write the whole
844 if (write_total > count) {
845 data = malloc (erase_len);
848 "Cannot malloc %zu bytes: %s\n",
849 erase_len, strerror (errno));
853 rc = flash_read_buf(dev, fd, data, write_total, erase_offset);
854 if (write_total != rc)
858 fprintf(stderr, "Preserving data ");
860 fprintf(stderr, "0x%x - 0x%lx", 0, block_seek - 1);
861 if (block_seek + count != write_total) {
863 fprintf(stderr, " and ");
864 fprintf(stderr, "0x%lx - 0x%lx",
865 (unsigned long) block_seek + count,
866 (unsigned long) write_total - 1);
868 fprintf(stderr, "\n");
870 /* Overwrite the old environment */
871 memcpy (data + block_seek, buf, count);
874 * We get here, iff offset is block-aligned and count is a
875 * multiple of blocklen - see write_total calculation above
880 if (DEVTYPE(dev) == MTD_NANDFLASH) {
882 * NAND: calculate which blocks we are writing. We have
883 * to write one block at a time to skip bad blocks.
885 erasesize = blocklen;
887 erasesize = erase_len;
890 erase.length = erasesize;
892 /* This only runs once on NOR flash and SPI-dataflash */
893 while (processed < write_total) {
894 rc = flash_bad_block(fd, DEVTYPE(dev), blockstart);
895 if (rc < 0) /* block test failed */
898 if (blockstart + erasesize > environment_end(dev)) {
899 fprintf (stderr, "End of range reached, aborting\n");
903 if (rc) { /* block is bad */
904 blockstart += blocklen;
908 if (DEVTYPE(dev) != MTD_ABSENT) {
909 erase.start = blockstart;
910 ioctl(fd, MEMUNLOCK, &erase);
911 /* These do not need an explicit erase cycle */
912 if (DEVTYPE(dev) != MTD_DATAFLASH)
913 if (ioctl(fd, MEMERASE, &erase) != 0) {
915 "MTD erase error on %s: %s\n",
916 DEVNAME(dev), strerror(errno));
921 if (lseek (fd, blockstart, SEEK_SET) == -1) {
923 "Seek error on %s: %s\n",
924 DEVNAME (dev), strerror (errno));
929 fprintf(stderr, "Write 0x%llx bytes at 0x%llx\n",
930 (unsigned long long) erasesize,
931 (unsigned long long) blockstart);
933 if (write (fd, data + processed, erasesize) != erasesize) {
934 fprintf (stderr, "Write error on %s: %s\n",
935 DEVNAME (dev), strerror (errno));
939 if (DEVTYPE(dev) != MTD_ABSENT)
940 ioctl(fd, MEMLOCK, &erase);
942 processed += erasesize;
944 blockstart += erasesize;
947 if (write_total > count)
954 * Set obsolete flag at offset - NOR flash only
956 static int flash_flag_obsolete (int dev, int fd, off_t offset)
959 struct erase_info_user erase;
961 erase.start = DEVOFFSET (dev);
962 erase.length = DEVESIZE (dev);
963 /* This relies on the fact, that obsolete_flag == 0 */
964 rc = lseek (fd, offset, SEEK_SET);
966 fprintf (stderr, "Cannot seek to set the flag on %s \n",
970 ioctl (fd, MEMUNLOCK, &erase);
971 rc = write (fd, &obsolete_flag, sizeof (obsolete_flag));
972 ioctl (fd, MEMLOCK, &erase);
974 perror ("Could not set obsolete flag");
979 /* Encrypt or decrypt the environment before writing or reading it. */
980 static int env_aes_cbc_crypt(char *payload, const int enc, uint8_t *key)
982 uint8_t *data = (uint8_t *)payload;
983 const int len = usable_envsize;
984 uint8_t key_exp[AES_EXPAND_KEY_LENGTH];
987 /* First we expand the key. */
988 aes_expand_key(key, key_exp);
990 /* Calculate the number of AES blocks to encrypt. */
991 aes_blocks = DIV_ROUND_UP(len, AES_KEY_LENGTH);
994 aes_cbc_encrypt_blocks(key_exp, data, data, aes_blocks);
996 aes_cbc_decrypt_blocks(key_exp, data, data, aes_blocks);
1001 static int flash_write (int fd_current, int fd_target, int dev_target)
1005 switch (environment.flag_scheme) {
1008 case FLAG_INCREMENTAL:
1009 (*environment.flags)++;
1012 *environment.flags = active_flag;
1015 fprintf (stderr, "Unimplemented flash scheme %u \n",
1016 environment.flag_scheme);
1021 fprintf(stderr, "Writing new environment at 0x%llx on %s\n",
1022 DEVOFFSET (dev_target), DEVNAME (dev_target));
1025 rc = flash_write_buf(dev_target, fd_target, environment.image,
1030 if (environment.flag_scheme == FLAG_BOOLEAN) {
1031 /* Have to set obsolete flag */
1032 off_t offset = DEVOFFSET (dev_current) +
1033 offsetof (struct env_image_redundant, flags);
1036 "Setting obsolete flag in environment at 0x%llx on %s\n",
1037 DEVOFFSET (dev_current), DEVNAME (dev_current));
1039 flash_flag_obsolete (dev_current, fd_current, offset);
1045 static int flash_read (int fd)
1049 rc = flash_read_buf(dev_current, fd, environment.image, CUR_ENVSIZE,
1050 DEVOFFSET(dev_current));
1051 if (rc != CUR_ENVSIZE)
1057 static int flash_io (int mode)
1059 int fd_current, fd_target, rc, dev_target;
1061 /* dev_current: fd_current, erase_current */
1062 fd_current = open (DEVNAME (dev_current), mode);
1063 if (fd_current < 0) {
1065 "Can't open %s: %s\n",
1066 DEVNAME (dev_current), strerror (errno));
1070 if (mode == O_RDWR) {
1071 if (HaveRedundEnv) {
1072 /* switch to next partition for writing */
1073 dev_target = !dev_current;
1074 /* dev_target: fd_target, erase_target */
1075 fd_target = open (DEVNAME (dev_target), mode);
1076 if (fd_target < 0) {
1078 "Can't open %s: %s\n",
1079 DEVNAME (dev_target),
1085 dev_target = dev_current;
1086 fd_target = fd_current;
1089 rc = flash_write (fd_current, fd_target, dev_target);
1091 if (fsync (fd_current)) {
1093 "fsync failed on %s: %s\n",
1094 DEVNAME (dev_current), strerror (errno));
1097 if (HaveRedundEnv) {
1098 if (fsync (fd_target)) {
1100 "fsync failed on %s: %s\n",
1101 DEVNAME (dev_current), strerror (errno));
1104 if (close (fd_target)) {
1106 "I/O error on %s: %s\n",
1107 DEVNAME (dev_target),
1113 rc = flash_read (fd_current);
1117 if (close (fd_current)) {
1119 "I/O error on %s: %s\n",
1120 DEVNAME (dev_current), strerror (errno));
1128 * Prevent confusion if running from erased flash memory
1130 int fw_env_open(struct env_opts *opts)
1133 unsigned char flag0;
1137 unsigned char flag1;
1142 struct env_image_single *single;
1143 struct env_image_redundant *redundant;
1146 opts = &default_opts;
1148 if (parse_config(opts)) /* should fill envdevices */
1151 addr0 = calloc(1, CUR_ENVSIZE);
1152 if (addr0 == NULL) {
1154 "Not enough memory for environment (%ld bytes)\n",
1160 /* read environment from FLASH to local buffer */
1161 environment.image = addr0;
1163 if (HaveRedundEnv) {
1165 environment.crc = &redundant->crc;
1166 environment.flags = &redundant->flags;
1167 environment.data = redundant->data;
1170 environment.crc = &single->crc;
1171 environment.flags = NULL;
1172 environment.data = single->data;
1176 if (flash_io(O_RDONLY)) {
1181 crc0 = crc32 (0, (uint8_t *) environment.data, ENV_SIZE);
1183 if (opts->aes_flag) {
1184 ret = env_aes_cbc_crypt(environment.data, 0,
1190 crc0_ok = (crc0 == *environment.crc);
1191 if (!HaveRedundEnv) {
1194 "Warning: Bad CRC, using default environment\n");
1195 memcpy(environment.data, default_environment, sizeof default_environment);
1198 flag0 = *environment.flags;
1201 addr1 = calloc(1, CUR_ENVSIZE);
1202 if (addr1 == NULL) {
1204 "Not enough memory for environment (%ld bytes)\n",
1212 * have to set environment.image for flash_read(), careful -
1213 * other pointers in environment still point inside addr0
1215 environment.image = addr1;
1216 if (flash_io(O_RDONLY)) {
1221 /* Check flag scheme compatibility */
1222 if (DEVTYPE(dev_current) == MTD_NORFLASH &&
1223 DEVTYPE(!dev_current) == MTD_NORFLASH) {
1224 environment.flag_scheme = FLAG_BOOLEAN;
1225 } else if (DEVTYPE(dev_current) == MTD_NANDFLASH &&
1226 DEVTYPE(!dev_current) == MTD_NANDFLASH) {
1227 environment.flag_scheme = FLAG_INCREMENTAL;
1228 } else if (DEVTYPE(dev_current) == MTD_DATAFLASH &&
1229 DEVTYPE(!dev_current) == MTD_DATAFLASH) {
1230 environment.flag_scheme = FLAG_BOOLEAN;
1231 } else if (DEVTYPE(dev_current) == MTD_UBIVOLUME &&
1232 DEVTYPE(!dev_current) == MTD_UBIVOLUME) {
1233 environment.flag_scheme = FLAG_INCREMENTAL;
1234 } else if (DEVTYPE(dev_current) == MTD_ABSENT &&
1235 DEVTYPE(!dev_current) == MTD_ABSENT) {
1236 environment.flag_scheme = FLAG_INCREMENTAL;
1238 fprintf (stderr, "Incompatible flash types!\n");
1243 crc1 = crc32 (0, (uint8_t *) redundant->data, ENV_SIZE);
1245 if (opts->aes_flag) {
1246 ret = env_aes_cbc_crypt(redundant->data, 0,
1252 crc1_ok = (crc1 == redundant->crc);
1253 flag1 = redundant->flags;
1255 if (crc0_ok && !crc1_ok) {
1257 } else if (!crc0_ok && crc1_ok) {
1259 } else if (!crc0_ok && !crc1_ok) {
1261 "Warning: Bad CRC, using default environment\n");
1262 memcpy (environment.data, default_environment,
1263 sizeof default_environment);
1266 switch (environment.flag_scheme) {
1268 if (flag0 == active_flag &&
1269 flag1 == obsolete_flag) {
1271 } else if (flag0 == obsolete_flag &&
1272 flag1 == active_flag) {
1274 } else if (flag0 == flag1) {
1276 } else if (flag0 == 0xFF) {
1278 } else if (flag1 == 0xFF) {
1284 case FLAG_INCREMENTAL:
1285 if (flag0 == 255 && flag1 == 0)
1287 else if ((flag1 == 255 && flag0 == 0) ||
1290 else /* flag1 > flag0 */
1294 fprintf (stderr, "Unknown flag scheme %u \n",
1295 environment.flag_scheme);
1301 * If we are reading, we don't need the flag and the CRC any
1302 * more, if we are writing, we will re-calculate CRC and update
1303 * flags before writing out
1306 environment.image = addr1;
1307 environment.crc = &redundant->crc;
1308 environment.flags = &redundant->flags;
1309 environment.data = redundant->data;
1312 environment.image = addr0;
1313 /* Other pointers are already set */
1317 fprintf(stderr, "Selected env in %s\n", DEVNAME(dev_current));
1333 * Simply free allocated buffer with environment
1335 int fw_env_close(struct env_opts *opts)
1337 if (environment.image)
1338 free(environment.image);
1340 environment.image = NULL;
1345 static int check_device_config(int dev)
1350 fd = open(DEVNAME(dev), O_RDONLY);
1353 "Cannot open %s: %s\n",
1354 DEVNAME(dev), strerror(errno));
1358 rc = fstat(fd, &st);
1360 fprintf(stderr, "Cannot stat the file %s\n",
1365 if (S_ISCHR(st.st_mode)) {
1366 struct mtd_info_user mtdinfo;
1367 rc = ioctl(fd, MEMGETINFO, &mtdinfo);
1369 fprintf(stderr, "Cannot get MTD information for %s\n",
1373 if (mtdinfo.type != MTD_NORFLASH &&
1374 mtdinfo.type != MTD_NANDFLASH &&
1375 mtdinfo.type != MTD_DATAFLASH &&
1376 mtdinfo.type != MTD_UBIVOLUME) {
1377 fprintf(stderr, "Unsupported flash type %u on %s\n",
1378 mtdinfo.type, DEVNAME(dev));
1381 DEVTYPE(dev) = mtdinfo.type;
1382 if (DEVESIZE(dev) == 0)
1383 /* Assume the erase size is the same as the env-size */
1384 DEVESIZE(dev) = ENVSIZE(dev);
1387 DEVTYPE(dev) = MTD_ABSENT;
1388 if (DEVESIZE(dev) == 0)
1389 /* Assume the erase size to be 512 bytes */
1390 DEVESIZE(dev) = 0x200;
1393 * Check for negative offsets, treat it as backwards offset
1394 * from the end of the block device
1396 if (DEVOFFSET(dev) < 0) {
1397 rc = ioctl(fd, BLKGETSIZE64, &size);
1399 fprintf(stderr, "Could not get block device size on %s\n",
1404 DEVOFFSET(dev) = DEVOFFSET(dev) + size;
1406 fprintf(stderr, "Calculated device offset 0x%llx on %s\n",
1407 DEVOFFSET(dev), DEVNAME(dev));
1412 if (ENVSECTORS(dev) == 0)
1413 /* Assume enough sectors to cover the environment */
1414 ENVSECTORS(dev) = DIV_ROUND_UP(ENVSIZE(dev), DEVESIZE(dev));
1416 if (DEVOFFSET(dev) % DEVESIZE(dev) != 0) {
1417 fprintf(stderr, "Environment does not start on (erase) block boundary\n");
1422 if (ENVSIZE(dev) > ENVSECTORS(dev) * DEVESIZE(dev)) {
1423 fprintf(stderr, "Environment does not fit into available sectors\n");
1433 static int parse_config(struct env_opts *opts)
1438 opts = &default_opts;
1440 #if defined(CONFIG_FILE)
1441 /* Fills in DEVNAME(), ENVSIZE(), DEVESIZE(). Or don't. */
1442 if (get_config(opts->config_file)) {
1443 fprintf(stderr, "Cannot parse config file '%s': %m\n",
1448 DEVNAME (0) = DEVICE1_NAME;
1449 DEVOFFSET (0) = DEVICE1_OFFSET;
1450 ENVSIZE (0) = ENV1_SIZE;
1452 /* Set defaults for DEVESIZE, ENVSECTORS later once we
1455 #ifdef DEVICE1_ESIZE
1456 DEVESIZE (0) = DEVICE1_ESIZE;
1458 #ifdef DEVICE1_ENVSECTORS
1459 ENVSECTORS (0) = DEVICE1_ENVSECTORS;
1463 DEVNAME (1) = DEVICE2_NAME;
1464 DEVOFFSET (1) = DEVICE2_OFFSET;
1465 ENVSIZE (1) = ENV2_SIZE;
1467 /* Set defaults for DEVESIZE, ENVSECTORS later once we
1470 #ifdef DEVICE2_ESIZE
1471 DEVESIZE (1) = DEVICE2_ESIZE;
1473 #ifdef DEVICE2_ENVSECTORS
1474 ENVSECTORS (1) = DEVICE2_ENVSECTORS;
1479 rc = check_device_config(0);
1483 if (HaveRedundEnv) {
1484 rc = check_device_config(1);
1488 if (ENVSIZE(0) != ENVSIZE(1)) {
1490 "Redundant environments have unequal size");
1495 usable_envsize = CUR_ENVSIZE - sizeof(uint32_t);
1497 usable_envsize -= sizeof(char);
1500 usable_envsize &= ~(AES_KEY_LENGTH - 1);
1505 #if defined(CONFIG_FILE)
1506 static int get_config (char *fname)
1514 fp = fopen (fname, "r");
1518 while (i < 2 && fgets (dump, sizeof (dump), fp)) {
1519 /* Skip incomplete conversions and comment strings */
1523 rc = sscanf(dump, "%ms %lli %lx %lx %lx",
1533 DEVNAME(i) = devname;
1535 /* Set defaults for DEVESIZE, ENVSECTORS later once we
1543 HaveRedundEnv = i - 1;
1544 if (!i) { /* No valid entries found */