1 // SPDX-License-Identifier: GPL-2.0+
3 * (C) Copyright 2000-2010
4 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
7 * Guennadi Liakhovetski, DENX Software Engineering, lg@denx.de.
15 #include <env_flags.h>
19 #include <linux/stringify.h>
25 #include <sys/types.h>
26 #include <sys/ioctl.h>
28 #include <u-boot/crc.h>
34 # include <linux/mtd/mtd.h>
36 # define __user /* nothing */
37 # include <mtd/mtd-user.h>
40 #include <mtd/ubi-user.h>
42 #include "fw_env_private.h"
45 struct env_opts default_opts = {
47 .config_file = CONFIG_FILE
51 #define DIV_ROUND_UP(n, d) (((n) + (d) - 1) / (d))
53 #define min(x, y) ({ \
54 typeof(x) _min1 = (x); \
55 typeof(y) _min2 = (y); \
56 (void) (&_min1 == &_min2); \
57 _min1 < _min2 ? _min1 : _min2; })
60 const char *devname; /* Device name */
61 long long devoff; /* Device offset */
62 ulong env_size; /* environment size */
63 ulong erase_size; /* device erase size */
64 ulong env_sectors; /* number of environment sectors */
65 uint8_t mtd_type; /* type of the MTD device */
66 int is_ubi; /* set if we use UBI volume */
69 static struct envdev_s envdevices[2] = {
71 .mtd_type = MTD_ABSENT,
73 .mtd_type = MTD_ABSENT,
77 static int dev_current;
79 #define DEVNAME(i) envdevices[(i)].devname
80 #define DEVOFFSET(i) envdevices[(i)].devoff
81 #define ENVSIZE(i) envdevices[(i)].env_size
82 #define DEVESIZE(i) envdevices[(i)].erase_size
83 #define ENVSECTORS(i) envdevices[(i)].env_sectors
84 #define DEVTYPE(i) envdevices[(i)].mtd_type
85 #define IS_UBI(i) envdevices[(i)].is_ubi
87 #define CUR_ENVSIZE ENVSIZE(dev_current)
89 static unsigned long usable_envsize;
90 #define ENV_SIZE usable_envsize
92 struct env_image_single {
93 uint32_t crc; /* CRC32 over data bytes */
97 struct env_image_redundant {
98 uint32_t crc; /* CRC32 over data bytes */
99 unsigned char flags; /* active or obsolete */
112 unsigned char *flags;
114 enum flag_scheme flag_scheme;
118 static struct environment environment = {
119 .flag_scheme = FLAG_NONE,
122 static int have_redund_env;
124 #define DEFAULT_ENV_INSTANCE_STATIC
125 #include <env_default.h>
127 #define UBI_DEV_START "/dev/ubi"
128 #define UBI_SYSFS "/sys/class/ubi"
129 #define UBI_VOL_NAME_PATT "ubi%d_%d"
131 static int is_ubi_devname(const char *devname)
133 return !strncmp(devname, UBI_DEV_START, sizeof(UBI_DEV_START) - 1);
136 static int ubi_check_volume_sysfs_name(const char *volume_sysfs_name,
144 strcpy(path, UBI_SYSFS "/");
145 strcat(path, volume_sysfs_name);
146 strcat(path, "/name");
148 file = fopen(path, "r");
152 ret = fscanf(file, "%ms", &name);
154 if (ret <= 0 || !name) {
156 "Failed to read from file %s, ret = %d, name = %s\n",
161 if (!strcmp(name, volname)) {
170 static int ubi_get_volnum_by_name(int devnum, const char *volname)
173 struct dirent *dirent;
178 sysfs_ubi = opendir(UBI_SYSFS);
183 fprintf(stderr, "Looking for volume name \"%s\"\n", volname);
187 dirent = readdir(sysfs_ubi);
191 ret = sscanf(dirent->d_name, UBI_VOL_NAME_PATT,
192 &tmp_devnum, &volnum);
193 if (ret == 2 && devnum == tmp_devnum) {
194 if (ubi_check_volume_sysfs_name(dirent->d_name,
203 static int ubi_get_devnum_by_devname(const char *devname)
208 ret = sscanf(devname + sizeof(UBI_DEV_START) - 1, "%d", &devnum);
215 static const char *ubi_get_volume_devname(const char *devname,
218 char *volume_devname;
223 devnum = ubi_get_devnum_by_devname(devname);
227 volnum = ubi_get_volnum_by_name(devnum, volname);
231 ret = asprintf(&volume_devname, "%s_%d", devname, volnum);
236 fprintf(stderr, "Found ubi volume \"%s:%s\" -> %s\n",
237 devname, volname, volume_devname);
240 return volume_devname;
243 static void ubi_check_dev(unsigned int dev_id)
245 char *devname = (char *)DEVNAME(dev_id);
247 const char *volname = NULL;
248 const char *volume_devname;
250 if (!is_ubi_devname(DEVNAME(dev_id)))
255 for (pname = devname; *pname != '\0'; pname++) {
264 /* Let's find real volume device name */
265 volume_devname = ubi_get_volume_devname(devname, volname);
266 if (!volume_devname) {
267 fprintf(stderr, "Didn't found ubi volume \"%s\"\n",
273 DEVNAME(dev_id) = volume_devname;
277 static int ubi_update_start(int fd, int64_t bytes)
279 if (ioctl(fd, UBI_IOCVOLUP, &bytes))
284 static int ubi_read(int fd, void *buf, size_t count)
289 ret = read(fd, buf, count);
299 * Happens in case of too short volume data size. If we
300 * return error status we will fail it will be treated
301 * as UBI device error.
303 * Leave catching this error to CRC check.
305 fprintf(stderr, "Warning: end of data on ubi volume\n");
307 } else if (errno == EBADF) {
309 * Happens in case of corrupted volume. The same as
310 * above, we cannot return error now, as we will still
311 * be able to successfully write environment later.
313 fprintf(stderr, "Warning: corrupted volume?\n");
315 } else if (errno == EINTR) {
319 fprintf(stderr, "Cannot read %u bytes from ubi volume, %s\n",
320 (unsigned int)count, strerror(errno));
327 static int ubi_write(int fd, const void *buf, size_t count)
332 ret = write(fd, buf, count);
334 if (ret < 0 && errno == EINTR)
337 fprintf(stderr, "Cannot write %u bytes to ubi volume\n",
338 (unsigned int)count);
349 static int flash_io(int mode);
350 static int parse_config(struct env_opts *opts);
352 #if defined(CONFIG_FILE)
353 static int get_config(char *);
356 static char *skip_chars(char *s)
358 for (; *s != '\0'; s++) {
359 if (isblank(*s) || *s == '=')
365 static char *skip_blanks(char *s)
367 for (; *s != '\0'; s++) {
375 * s1 is either a simple 'name', or a 'name=value' pair.
376 * s2 is a 'name=value' pair.
377 * If the names match, return the value of s2, else NULL.
379 static char *envmatch(char *s1, char *s2)
381 if (s1 == NULL || s2 == NULL)
387 if (*s1 == '\0' && *(s2 - 1) == '=')
393 * Search the environment for a variable.
394 * Return the value, if found, or NULL, if not found.
396 char *fw_getenv(char *name)
400 for (env = environment.data; *env; env = nxt + 1) {
403 for (nxt = env; *nxt; ++nxt) {
404 if (nxt >= &environment.data[ENV_SIZE]) {
405 fprintf(stderr, "## Error: "
406 "environment not terminated\n");
410 val = envmatch(name, env);
419 * Search the default environment for a variable.
420 * Return the value, if found, or NULL, if not found.
422 char *fw_getdefenv(char *name)
426 for (env = default_environment; *env; env = nxt + 1) {
429 for (nxt = env; *nxt; ++nxt) {
430 if (nxt >= &default_environment[ENV_SIZE]) {
431 fprintf(stderr, "## Error: "
432 "default environment not terminated\n");
436 val = envmatch(name, env);
445 * Print the current definition of one, or more, or all
446 * environment variables
448 int fw_printenv(int argc, char *argv[], int value_only, struct env_opts *opts)
452 if (value_only && argc != 1) {
454 "## Error: `-n'/`--noheader' option requires exactly one argument\n");
459 opts = &default_opts;
461 if (fw_env_open(opts))
464 if (argc == 0) { /* Print all env variables */
466 for (env = environment.data; *env; env = nxt + 1) {
467 for (nxt = env; *nxt; ++nxt) {
468 if (nxt >= &environment.data[ENV_SIZE]) {
469 fprintf(stderr, "## Error: "
470 "environment not terminated\n");
481 for (i = 0; i < argc; ++i) { /* print a subset of env variables */
482 char *name = argv[i];
485 val = fw_getenv(name);
487 fprintf(stderr, "## Error: \"%s\" not defined\n", name);
497 printf("%s=%s\n", name, val);
505 int fw_env_flush(struct env_opts *opts)
508 opts = &default_opts;
510 if (!environment.dirty)
516 *environment.crc = crc32(0, (uint8_t *) environment.data, ENV_SIZE);
518 /* write environment back to flash */
519 if (flash_io(O_RDWR)) {
520 fprintf(stderr, "Error: can't write fw_env to flash\n");
528 * Set/Clear a single variable in the environment.
529 * This is called in sequence to update the environment
530 * in RAM without updating the copy in flash after each set
532 int fw_env_write(char *name, char *value)
537 int deleting, creating, overwriting;
540 * search if variable with this name already exists
542 for (nxt = env = environment.data; *env; env = nxt + 1) {
543 for (nxt = env; *nxt; ++nxt) {
544 if (nxt >= &environment.data[ENV_SIZE]) {
545 fprintf(stderr, "## Error: "
546 "environment not terminated\n");
551 oldval = envmatch(name, env);
556 deleting = (oldval && !(value && strlen(value)));
557 creating = (!oldval && (value && strlen(value)));
558 overwriting = (oldval && (value && strlen(value) &&
559 strcmp(oldval, value)));
561 /* check for permission */
563 if (env_flags_validate_varaccess(name,
564 ENV_FLAGS_VARACCESS_PREVENT_DELETE)) {
565 printf("Can't delete \"%s\"\n", name);
569 } else if (overwriting) {
570 if (env_flags_validate_varaccess(name,
571 ENV_FLAGS_VARACCESS_PREVENT_OVERWR)) {
572 printf("Can't overwrite \"%s\"\n", name);
575 } else if (env_flags_validate_varaccess(name,
576 ENV_FLAGS_VARACCESS_PREVENT_NONDEF_OVERWR)) {
577 const char *defval = fw_getdefenv(name);
581 if (strcmp(oldval, defval)
583 printf("Can't overwrite \"%s\"\n", name);
588 } else if (creating) {
589 if (env_flags_validate_varaccess(name,
590 ENV_FLAGS_VARACCESS_PREVENT_CREATE)) {
591 printf("Can't create \"%s\"\n", name);
599 environment.dirty = 1;
600 if (deleting || overwriting) {
601 if (*++nxt == '\0') {
606 if ((*env == '\0') && (*nxt == '\0'))
615 if (!value || !strlen(value))
619 * Append new definition at the end
621 for (env = environment.data; *env || *(env + 1); ++env)
623 if (env > environment.data)
627 * "name" + "=" + "val" +"\0\0" > CUR_ENVSIZE - (env-environment)
629 len = strlen(name) + 2;
630 /* add '=' for first arg, ' ' for all others */
631 len += strlen(value) + 1;
633 if (len > (&environment.data[ENV_SIZE] - env)) {
635 "Error: environment overflow, \"%s\" deleted\n", name);
639 while ((*env = *name++) != '\0')
642 while ((*++env = *value++) != '\0')
645 /* end is marked with double '\0' */
652 * Deletes or sets environment variables. Returns -1 and sets errno error codes:
654 * EINVAL - need at least 1 argument
655 * EROFS - certain variables ("ethaddr", "serial#") cannot be
656 * modified or deleted
659 int fw_env_set(int argc, char *argv[], struct env_opts *opts)
670 opts = &default_opts;
673 fprintf(stderr, "## Error: variable name missing\n");
678 if (fw_env_open(opts)) {
679 fprintf(stderr, "Error: environment not initialized\n");
687 if (env_flags_validate_env_set_params(name, valv, valc) < 0) {
693 for (i = 0; i < valc; ++i) {
695 size_t val_len = strlen(val);
698 value[len - 1] = ' ';
700 value = realloc(value, len + val_len + 1);
703 "Cannot malloc %zu bytes: %s\n",
704 len, strerror(errno));
709 memcpy(value + len, val, val_len);
714 fw_env_write(name, value);
718 ret = fw_env_flush(opts);
725 * Parse a file and configure the u-boot variables.
726 * The script file has a very simple format, as follows:
728 * Each line has a couple with name, value:
729 * <white spaces>variable_name<white spaces>variable_value
731 * Both variable_name and variable_value are interpreted as strings.
732 * Any character after <white spaces> and before ending \r\n is interpreted
733 * as variable's value (no comment allowed on these lines !)
735 * Comments are allowed if the first character in the line is #
737 * Returns -1 and sets errno error codes:
741 int fw_parse_script(char *fname, struct env_opts *opts)
753 opts = &default_opts;
755 if (fw_env_open(opts)) {
756 fprintf(stderr, "Error: environment not initialized\n");
760 if (strcmp(fname, "-") == 0)
763 fp = fopen(fname, "r");
765 fprintf(stderr, "I cannot open %s for reading\n",
771 while ((len = getline(&line, &linesize, fp)) != -1) {
775 * Read a whole line from the file. If the line is not
776 * terminated, reports an error and exit.
778 if (line[len - 1] != '\n') {
780 "Line %d not correctly terminated\n",
786 /* Drop ending line feed / carriage return */
788 if (len && line[len - 1] == '\r')
791 /* Skip comment or empty lines */
792 if (len == 0 || line[0] == '#')
796 * Search for variable's name remove leading whitespaces
798 name = skip_blanks(line);
802 /* The first white space is the end of variable name */
803 val = skip_chars(name);
807 if ((val - name) < len)
808 val = skip_blanks(val);
813 fprintf(stderr, "Setting %s : %s\n",
814 name, val ? val : " removed");
817 if (env_flags_validate_type(name, val) < 0) {
823 * If there is an error setting a variable,
824 * try to save the environment and returns an error
826 if (fw_env_write(name, val)) {
828 "fw_env_write returns with error : %s\n",
837 /* Close file if not stdin */
838 if (strcmp(fname, "-") != 0)
841 ret |= fw_env_flush(opts);
849 * environment_end() - compute offset of first byte right after environment
850 * @dev - index of enviroment buffer
852 * device offset of first byte right after environment
854 off_t environment_end(int dev)
856 /* environment is block aligned */
857 return DEVOFFSET(dev) + ENVSECTORS(dev) * DEVESIZE(dev);
861 * Test for bad block on NAND, just returns 0 on NOR, on NAND:
864 * < 0 - failed to test
866 static int flash_bad_block(int fd, uint8_t mtd_type, loff_t blockstart)
868 if (mtd_type == MTD_NANDFLASH) {
869 int badblock = ioctl(fd, MEMGETBADBLOCK, &blockstart);
872 perror("Cannot read bad block mark");
878 fprintf(stderr, "Bad block at 0x%llx, skipping\n",
879 (unsigned long long)blockstart);
889 * Read data from flash at an offset into a provided buffer. On NAND it skips
890 * bad blocks but makes sure it stays within ENVSECTORS (dev) starting from
891 * the DEVOFFSET (dev) block. On NOR the loop is only run once.
893 static int flash_read_buf(int dev, int fd, void *buf, size_t count,
896 size_t blocklen; /* erase / write length - one block on NAND,
898 size_t processed = 0; /* progress counter */
899 size_t readlen = count; /* current read length */
900 off_t block_seek; /* offset inside the current block to the start
902 loff_t blockstart; /* running start of the current block -
903 MEMGETBADBLOCK needs 64 bits */
906 blockstart = (offset / DEVESIZE(dev)) * DEVESIZE(dev);
908 /* Offset inside a block */
909 block_seek = offset - blockstart;
911 if (DEVTYPE(dev) == MTD_NANDFLASH) {
913 * NAND: calculate which blocks we are reading. We have
914 * to read one block at a time to skip bad blocks.
916 blocklen = DEVESIZE(dev);
918 /* Limit to one block for the first read */
919 if (readlen > blocklen - block_seek)
920 readlen = blocklen - block_seek;
925 /* This only runs once on NOR flash */
926 while (processed < count) {
927 rc = flash_bad_block(fd, DEVTYPE(dev), blockstart);
928 if (rc < 0) /* block test failed */
931 if (blockstart + block_seek + readlen > environment_end(dev)) {
932 /* End of range is reached */
933 fprintf(stderr, "Too few good blocks within range\n");
937 if (rc) { /* block is bad */
938 blockstart += blocklen;
943 * If a block is bad, we retry in the next block at the same
944 * offset - see env/nand.c::writeenv()
946 lseek(fd, blockstart + block_seek, SEEK_SET);
948 rc = read(fd, buf + processed, readlen);
950 fprintf(stderr, "Read error on %s: %s\n",
951 DEVNAME(dev), strerror(errno));
955 fprintf(stderr, "Read 0x%x bytes at 0x%llx on %s\n",
956 rc, (unsigned long long)blockstart + block_seek,
962 "Warning on %s: Attempted to read %zd bytes but got %d\n",
963 DEVNAME(dev), readlen, rc);
967 blockstart += blocklen;
968 readlen = min(blocklen, count - processed);
977 * Write count bytes from begin of environment, but stay within
978 * ENVSECTORS(dev) sectors of
979 * DEVOFFSET (dev). Similar to the read case above, on NOR and dataflash we
980 * erase and write the whole data at once.
982 static int flash_write_buf(int dev, int fd, void *buf, size_t count)
985 struct erase_info_user erase;
986 size_t blocklen; /* length of NAND block / NOR erase sector */
987 size_t erase_len; /* whole area that can be erased - may include
989 size_t erasesize; /* erase / write length - one block on NAND,
991 size_t processed = 0; /* progress counter */
992 size_t write_total; /* total size to actually write - excluding
994 off_t erase_offset; /* offset to the first erase block (aligned)
996 off_t block_seek; /* offset inside the erase block to the start
998 loff_t blockstart; /* running start of the current block -
999 MEMGETBADBLOCK needs 64 bits */
1000 int was_locked = 0; /* flash lock flag */
1004 * For mtd devices only offset and size of the environment do matter
1006 if (DEVTYPE(dev) == MTD_ABSENT) {
1008 erase_len = blocklen;
1009 blockstart = DEVOFFSET(dev);
1011 write_total = blocklen;
1013 blocklen = DEVESIZE(dev);
1015 erase_offset = DEVOFFSET(dev);
1017 /* Maximum area we may use */
1018 erase_len = environment_end(dev) - erase_offset;
1020 blockstart = erase_offset;
1022 /* Offset inside a block */
1023 block_seek = DEVOFFSET(dev) - erase_offset;
1026 * Data size we actually write: from the start of the block
1027 * to the start of the data, then count bytes of data, and
1028 * to the end of the block
1030 write_total = ((block_seek + count + blocklen - 1) /
1031 blocklen) * blocklen;
1035 * Support data anywhere within erase sectors: read out the complete
1036 * area to be erased, replace the environment image, write the whole
1039 if (write_total > count) {
1040 data = malloc(erase_len);
1043 "Cannot malloc %zu bytes: %s\n",
1044 erase_len, strerror(errno));
1048 rc = flash_read_buf(dev, fd, data, write_total, erase_offset);
1049 if (write_total != rc)
1053 fprintf(stderr, "Preserving data ");
1054 if (block_seek != 0)
1055 fprintf(stderr, "0x%x - 0x%lx", 0, block_seek - 1);
1056 if (block_seek + count != write_total) {
1057 if (block_seek != 0)
1058 fprintf(stderr, " and ");
1059 fprintf(stderr, "0x%lx - 0x%lx",
1060 (unsigned long)block_seek + count,
1061 (unsigned long)write_total - 1);
1063 fprintf(stderr, "\n");
1065 /* Overwrite the old environment */
1066 memcpy(data + block_seek, buf, count);
1069 * We get here, iff offset is block-aligned and count is a
1070 * multiple of blocklen - see write_total calculation above
1075 if (DEVTYPE(dev) == MTD_NANDFLASH) {
1077 * NAND: calculate which blocks we are writing. We have
1078 * to write one block at a time to skip bad blocks.
1080 erasesize = blocklen;
1082 erasesize = erase_len;
1085 erase.length = erasesize;
1087 /* This only runs once on NOR flash and SPI-dataflash */
1088 while (processed < write_total) {
1089 rc = flash_bad_block(fd, DEVTYPE(dev), blockstart);
1090 if (rc < 0) /* block test failed */
1093 if (blockstart + erasesize > environment_end(dev)) {
1094 fprintf(stderr, "End of range reached, aborting\n");
1098 if (rc) { /* block is bad */
1099 blockstart += blocklen;
1103 if (DEVTYPE(dev) != MTD_ABSENT) {
1104 erase.start = blockstart;
1105 was_locked = ioctl(fd, MEMISLOCKED, &erase);
1106 /* treat any errors as unlocked flash */
1110 ioctl(fd, MEMUNLOCK, &erase);
1111 /* These do not need an explicit erase cycle */
1112 if (DEVTYPE(dev) != MTD_DATAFLASH)
1113 if (ioctl(fd, MEMERASE, &erase) != 0) {
1115 "MTD erase error on %s: %s\n",
1116 DEVNAME(dev), strerror(errno));
1121 if (lseek(fd, blockstart, SEEK_SET) == -1) {
1123 "Seek error on %s: %s\n",
1124 DEVNAME(dev), strerror(errno));
1128 fprintf(stderr, "Write 0x%llx bytes at 0x%llx\n",
1129 (unsigned long long)erasesize,
1130 (unsigned long long)blockstart);
1132 if (write(fd, data + processed, erasesize) != erasesize) {
1133 fprintf(stderr, "Write error on %s: %s\n",
1134 DEVNAME(dev), strerror(errno));
1138 if (DEVTYPE(dev) != MTD_ABSENT) {
1140 ioctl(fd, MEMLOCK, &erase);
1143 processed += erasesize;
1145 blockstart += erasesize;
1148 if (write_total > count)
1155 * Set obsolete flag at offset - NOR flash only
1157 static int flash_flag_obsolete(int dev, int fd, off_t offset)
1160 struct erase_info_user erase;
1161 char tmp = ENV_REDUND_OBSOLETE;
1162 int was_locked; /* flash lock flag */
1164 erase.start = DEVOFFSET(dev);
1165 erase.length = DEVESIZE(dev);
1166 /* This relies on the fact, that ENV_REDUND_OBSOLETE == 0 */
1167 rc = lseek(fd, offset, SEEK_SET);
1169 fprintf(stderr, "Cannot seek to set the flag on %s\n",
1173 was_locked = ioctl(fd, MEMISLOCKED, &erase);
1174 /* treat any errors as unlocked flash */
1178 ioctl(fd, MEMUNLOCK, &erase);
1179 rc = write(fd, &tmp, sizeof(tmp));
1181 ioctl(fd, MEMLOCK, &erase);
1183 perror("Could not set obsolete flag");
1188 static int flash_write(int fd_current, int fd_target, int dev_target)
1192 switch (environment.flag_scheme) {
1195 case FLAG_INCREMENTAL:
1196 (*environment.flags)++;
1199 *environment.flags = ENV_REDUND_ACTIVE;
1202 fprintf(stderr, "Unimplemented flash scheme %u\n",
1203 environment.flag_scheme);
1208 fprintf(stderr, "Writing new environment at 0x%llx on %s\n",
1209 DEVOFFSET(dev_target), DEVNAME(dev_target));
1212 if (IS_UBI(dev_target)) {
1213 if (ubi_update_start(fd_target, CUR_ENVSIZE) < 0)
1215 return ubi_write(fd_target, environment.image, CUR_ENVSIZE);
1218 rc = flash_write_buf(dev_target, fd_target, environment.image,
1223 if (environment.flag_scheme == FLAG_BOOLEAN) {
1224 /* Have to set obsolete flag */
1225 off_t offset = DEVOFFSET(dev_current) +
1226 offsetof(struct env_image_redundant, flags);
1229 "Setting obsolete flag in environment at 0x%llx on %s\n",
1230 DEVOFFSET(dev_current), DEVNAME(dev_current));
1232 flash_flag_obsolete(dev_current, fd_current, offset);
1238 static int flash_read(int fd)
1242 if (IS_UBI(dev_current)) {
1243 DEVTYPE(dev_current) = MTD_ABSENT;
1245 return ubi_read(fd, environment.image, CUR_ENVSIZE);
1248 rc = flash_read_buf(dev_current, fd, environment.image, CUR_ENVSIZE,
1249 DEVOFFSET(dev_current));
1250 if (rc != CUR_ENVSIZE)
1256 static int flash_open_tempfile(const char **dname, const char **target_temp)
1258 char *dup_name = strdup(DEVNAME(dev_current));
1259 char *temp_name = NULL;
1265 *dname = dirname(dup_name);
1269 rc = asprintf(&temp_name, "%s/XXXXXX", *dname);
1273 rc = mkstemp(temp_name);
1275 /* fall back to in place write */
1277 "Can't create %s: %s\n", temp_name, strerror(errno));
1280 *target_temp = temp_name;
1281 /* deliberately leak dup_name as dname /might/ point into
1282 * it and we need it for our caller
1294 static int flash_io_write(int fd_current)
1296 int fd_target = -1, rc, dev_target;
1297 const char *dname, *target_temp = NULL;
1299 if (have_redund_env) {
1300 /* switch to next partition for writing */
1301 dev_target = !dev_current;
1302 /* dev_target: fd_target, erase_target */
1303 fd_target = open(DEVNAME(dev_target), O_RDWR);
1304 if (fd_target < 0) {
1306 "Can't open %s: %s\n",
1307 DEVNAME(dev_target), strerror(errno));
1314 if (fstat(fd_current, &sb) == 0 && S_ISREG(sb.st_mode)) {
1315 /* if any part of flash_open_tempfile() fails we fall
1316 * back to in-place writes
1318 fd_target = flash_open_tempfile(&dname, &target_temp);
1320 dev_target = dev_current;
1321 if (fd_target == -1)
1322 fd_target = fd_current;
1325 rc = flash_write(fd_current, fd_target, dev_target);
1327 if (fsync(fd_current) && !(errno == EINVAL || errno == EROFS)) {
1329 "fsync failed on %s: %s\n",
1330 DEVNAME(dev_current), strerror(errno));
1333 if (fd_current != fd_target) {
1334 if (fsync(fd_target) &&
1335 !(errno == EINVAL || errno == EROFS)) {
1337 "fsync failed on %s: %s\n",
1338 DEVNAME(dev_current), strerror(errno));
1341 if (close(fd_target)) {
1343 "I/O error on %s: %s\n",
1344 DEVNAME(dev_target), strerror(errno));
1348 if (rc >= 0 && target_temp) {
1351 dir_fd = open(dname, O_DIRECTORY | O_RDONLY);
1354 "Can't open %s: %s\n",
1355 dname, strerror(errno));
1357 if (rename(target_temp, DEVNAME(dev_target))) {
1359 "rename failed %s => %s: %s\n",
1360 target_temp, DEVNAME(dev_target),
1365 if (dir_fd != -1 && fsync(dir_fd))
1367 "fsync failed on %s: %s\n",
1368 dname, strerror(errno));
1370 if (dir_fd != -1 && close(dir_fd))
1372 "I/O error on %s: %s\n",
1373 dname, strerror(errno));
1380 static int flash_io(int mode)
1384 /* dev_current: fd_current, erase_current */
1385 fd_current = open(DEVNAME(dev_current), mode);
1386 if (fd_current < 0) {
1388 "Can't open %s: %s\n",
1389 DEVNAME(dev_current), strerror(errno));
1393 if (mode == O_RDWR) {
1394 rc = flash_io_write(fd_current);
1396 rc = flash_read(fd_current);
1399 if (close(fd_current)) {
1401 "I/O error on %s: %s\n",
1402 DEVNAME(dev_current), strerror(errno));
1410 * Prevent confusion if running from erased flash memory
1412 int fw_env_open(struct env_opts *opts)
1415 unsigned char flag0;
1419 unsigned char flag1;
1424 struct env_image_single *single;
1425 struct env_image_redundant *redundant;
1428 opts = &default_opts;
1430 if (parse_config(opts)) /* should fill envdevices */
1433 addr0 = calloc(1, CUR_ENVSIZE);
1434 if (addr0 == NULL) {
1436 "Not enough memory for environment (%ld bytes)\n",
1442 /* read environment from FLASH to local buffer */
1443 environment.image = addr0;
1445 if (have_redund_env) {
1447 environment.crc = &redundant->crc;
1448 environment.flags = &redundant->flags;
1449 environment.data = redundant->data;
1452 environment.crc = &single->crc;
1453 environment.flags = NULL;
1454 environment.data = single->data;
1458 if (flash_io(O_RDONLY)) {
1463 crc0 = crc32(0, (uint8_t *)environment.data, ENV_SIZE);
1465 crc0_ok = (crc0 == *environment.crc);
1466 if (!have_redund_env) {
1469 "Warning: Bad CRC, using default environment\n");
1470 memcpy(environment.data, default_environment,
1471 sizeof(default_environment));
1472 environment.dirty = 1;
1475 flag0 = *environment.flags;
1478 addr1 = calloc(1, CUR_ENVSIZE);
1479 if (addr1 == NULL) {
1481 "Not enough memory for environment (%ld bytes)\n",
1489 * have to set environment.image for flash_read(), careful -
1490 * other pointers in environment still point inside addr0
1492 environment.image = addr1;
1493 if (flash_io(O_RDONLY)) {
1498 /* Check flag scheme compatibility */
1499 if (DEVTYPE(dev_current) == MTD_NORFLASH &&
1500 DEVTYPE(!dev_current) == MTD_NORFLASH) {
1501 environment.flag_scheme = FLAG_BOOLEAN;
1502 } else if (DEVTYPE(dev_current) == MTD_NANDFLASH &&
1503 DEVTYPE(!dev_current) == MTD_NANDFLASH) {
1504 environment.flag_scheme = FLAG_INCREMENTAL;
1505 } else if (DEVTYPE(dev_current) == MTD_DATAFLASH &&
1506 DEVTYPE(!dev_current) == MTD_DATAFLASH) {
1507 environment.flag_scheme = FLAG_BOOLEAN;
1508 } else if (DEVTYPE(dev_current) == MTD_UBIVOLUME &&
1509 DEVTYPE(!dev_current) == MTD_UBIVOLUME) {
1510 environment.flag_scheme = FLAG_INCREMENTAL;
1511 } else if (DEVTYPE(dev_current) == MTD_ABSENT &&
1512 DEVTYPE(!dev_current) == MTD_ABSENT &&
1513 IS_UBI(dev_current) == IS_UBI(!dev_current)) {
1514 environment.flag_scheme = FLAG_INCREMENTAL;
1516 fprintf(stderr, "Incompatible flash types!\n");
1521 crc1 = crc32(0, (uint8_t *)redundant->data, ENV_SIZE);
1523 crc1_ok = (crc1 == redundant->crc);
1524 flag1 = redundant->flags;
1527 * environment.data still points to ((struct
1528 * env_image_redundant *)addr0)->data. If the two
1529 * environments differ, or one has bad crc, force a
1530 * write-out by marking the environment dirty.
1532 if (memcmp(environment.data, redundant->data, ENV_SIZE) ||
1533 !crc0_ok || !crc1_ok)
1534 environment.dirty = 1;
1536 if (crc0_ok && !crc1_ok) {
1538 } else if (!crc0_ok && crc1_ok) {
1540 } else if (!crc0_ok && !crc1_ok) {
1542 "Warning: Bad CRC, using default environment\n");
1543 memcpy(environment.data, default_environment,
1544 sizeof(default_environment));
1545 environment.dirty = 1;
1548 switch (environment.flag_scheme) {
1550 if (flag0 == ENV_REDUND_ACTIVE &&
1551 flag1 == ENV_REDUND_OBSOLETE) {
1553 } else if (flag0 == ENV_REDUND_OBSOLETE &&
1554 flag1 == ENV_REDUND_ACTIVE) {
1556 } else if (flag0 == flag1) {
1558 } else if (flag0 == 0xFF) {
1560 } else if (flag1 == 0xFF) {
1566 case FLAG_INCREMENTAL:
1567 if (flag0 == 255 && flag1 == 0)
1569 else if ((flag1 == 255 && flag0 == 0) ||
1572 else /* flag1 > flag0 */
1576 fprintf(stderr, "Unknown flag scheme %u\n",
1577 environment.flag_scheme);
1583 * If we are reading, we don't need the flag and the CRC any
1584 * more, if we are writing, we will re-calculate CRC and update
1585 * flags before writing out
1588 environment.image = addr1;
1589 environment.crc = &redundant->crc;
1590 environment.flags = &redundant->flags;
1591 environment.data = redundant->data;
1594 environment.image = addr0;
1595 /* Other pointers are already set */
1599 fprintf(stderr, "Selected env in %s\n", DEVNAME(dev_current));
1615 * Simply free allocated buffer with environment
1617 int fw_env_close(struct env_opts *opts)
1619 if (environment.image)
1620 free(environment.image);
1622 environment.image = NULL;
1627 static int check_device_config(int dev)
1633 /* Fills in IS_UBI(), converts DEVNAME() with ubi volume name */
1636 fd = open(DEVNAME(dev), O_RDONLY);
1639 "Cannot open %s: %s\n", DEVNAME(dev), strerror(errno));
1643 rc = fstat(fd, &st);
1645 fprintf(stderr, "Cannot stat the file %s\n", DEVNAME(dev));
1650 rc = ioctl(fd, UBI_IOCEBISMAP, &lnum);
1652 fprintf(stderr, "Cannot get UBI information for %s\n",
1656 } else if (S_ISCHR(st.st_mode)) {
1657 struct mtd_info_user mtdinfo;
1658 rc = ioctl(fd, MEMGETINFO, &mtdinfo);
1660 fprintf(stderr, "Cannot get MTD information for %s\n",
1664 if (mtdinfo.type != MTD_NORFLASH &&
1665 mtdinfo.type != MTD_NANDFLASH &&
1666 mtdinfo.type != MTD_DATAFLASH &&
1667 mtdinfo.type != MTD_UBIVOLUME) {
1668 fprintf(stderr, "Unsupported flash type %u on %s\n",
1669 mtdinfo.type, DEVNAME(dev));
1672 DEVTYPE(dev) = mtdinfo.type;
1673 if (DEVESIZE(dev) == 0 && ENVSECTORS(dev) == 0 &&
1674 mtdinfo.type == MTD_NORFLASH)
1675 DEVESIZE(dev) = mtdinfo.erasesize;
1676 if (DEVESIZE(dev) == 0)
1677 /* Assume the erase size is the same as the env-size */
1678 DEVESIZE(dev) = ENVSIZE(dev);
1681 DEVTYPE(dev) = MTD_ABSENT;
1682 if (DEVESIZE(dev) == 0)
1683 /* Assume the erase size to be 512 bytes */
1684 DEVESIZE(dev) = 0x200;
1687 * Check for negative offsets, treat it as backwards offset
1688 * from the end of the block device
1690 if (DEVOFFSET(dev) < 0) {
1691 rc = ioctl(fd, BLKGETSIZE64, &size);
1694 "Could not get block device size on %s\n",
1699 DEVOFFSET(dev) = DEVOFFSET(dev) + size;
1702 "Calculated device offset 0x%llx on %s\n",
1703 DEVOFFSET(dev), DEVNAME(dev));
1708 if (ENVSECTORS(dev) == 0)
1709 /* Assume enough sectors to cover the environment */
1710 ENVSECTORS(dev) = DIV_ROUND_UP(ENVSIZE(dev), DEVESIZE(dev));
1712 if (DEVOFFSET(dev) % DEVESIZE(dev) != 0) {
1714 "Environment does not start on (erase) block boundary\n");
1719 if (ENVSIZE(dev) > ENVSECTORS(dev) * DEVESIZE(dev)) {
1721 "Environment does not fit into available sectors\n");
1731 static int parse_config(struct env_opts *opts)
1736 opts = &default_opts;
1738 #if defined(CONFIG_FILE)
1739 /* Fills in DEVNAME(), ENVSIZE(), DEVESIZE(). Or don't. */
1740 if (get_config(opts->config_file)) {
1741 fprintf(stderr, "Cannot parse config file '%s': %m\n",
1746 DEVNAME(0) = DEVICE1_NAME;
1747 DEVOFFSET(0) = DEVICE1_OFFSET;
1748 ENVSIZE(0) = ENV1_SIZE;
1750 /* Set defaults for DEVESIZE, ENVSECTORS later once we
1753 #ifdef DEVICE1_ESIZE
1754 DEVESIZE(0) = DEVICE1_ESIZE;
1756 #ifdef DEVICE1_ENVSECTORS
1757 ENVSECTORS(0) = DEVICE1_ENVSECTORS;
1761 DEVNAME(1) = DEVICE2_NAME;
1762 DEVOFFSET(1) = DEVICE2_OFFSET;
1763 ENVSIZE(1) = ENV2_SIZE;
1765 /* Set defaults for DEVESIZE, ENVSECTORS later once we
1768 #ifdef DEVICE2_ESIZE
1769 DEVESIZE(1) = DEVICE2_ESIZE;
1771 #ifdef DEVICE2_ENVSECTORS
1772 ENVSECTORS(1) = DEVICE2_ENVSECTORS;
1774 have_redund_env = 1;
1777 rc = check_device_config(0);
1781 if (have_redund_env) {
1782 rc = check_device_config(1);
1786 if (ENVSIZE(0) != ENVSIZE(1)) {
1788 "Redundant environments have unequal size\n");
1793 usable_envsize = CUR_ENVSIZE - sizeof(uint32_t);
1794 if (have_redund_env)
1795 usable_envsize -= sizeof(char);
1800 #if defined(CONFIG_FILE)
1801 static int get_config(char *fname)
1807 size_t linesize = 0;
1810 fp = fopen(fname, "r");
1814 while (i < 2 && getline(&line, &linesize, fp) != -1) {
1815 /* Skip comment strings */
1819 rc = sscanf(line, "%ms %lli %lx %lx %lx",
1822 &ENVSIZE(i), &DEVESIZE(i), &ENVSECTORS(i));
1827 DEVNAME(i) = devname;
1829 /* Set defaults for DEVESIZE, ENVSECTORS later once we
1838 have_redund_env = i - 1;
1839 if (!i) { /* No valid entries found */