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+
12 #include <env_flags.h>
14 #include <linux/stringify.h>
19 #include <sys/types.h>
20 #include <sys/ioctl.h>
26 # include <linux/mtd/mtd.h>
28 # define __user /* nothing */
29 # include <mtd/mtd-user.h>
36 #define DIV_ROUND_UP(n, d) (((n) + (d) - 1) / (d))
38 #define WHITESPACE(c) ((c == '\t') || (c == ' '))
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 #define ENV_SIZE getenvsize()
76 struct env_image_single
{
77 uint32_t crc
; /* CRC32 over data bytes */
81 struct env_image_redundant
{
82 uint32_t crc
; /* CRC32 over data bytes */
83 unsigned char flags
; /* active or obsolete */
98 enum flag_scheme flag_scheme
;
101 static struct environment environment
= {
102 .flag_scheme
= FLAG_NONE
,
105 /* Is AES encryption used? */
107 static uint8_t aes_key
[AES_KEY_LENGTH
] = { 0 };
108 static int env_aes_cbc_crypt(char *data
, const int enc
);
110 static int HaveRedundEnv
= 0;
112 static unsigned char active_flag
= 1;
113 /* obsolete_flag must be 0 to efficiently set it on NOR flash without erasing */
114 static unsigned char obsolete_flag
= 0;
116 #define DEFAULT_ENV_INSTANCE_STATIC
117 #include <env_default.h>
119 static int flash_io (int mode
);
120 static char *envmatch (char * s1
, char * s2
);
121 static int parse_config (void);
123 #if defined(CONFIG_FILE)
124 static int get_config (char *);
126 static inline ulong
getenvsize (void)
128 ulong rc
= CUR_ENVSIZE
- sizeof(uint32_t);
134 rc
&= ~(AES_KEY_LENGTH
- 1);
139 static char *fw_string_blank(char *s
, int noblank
)
144 for (i
= 0; i
< len
; i
++, s
++) {
145 if ((noblank
&& !WHITESPACE(*s
)) ||
146 (!noblank
&& WHITESPACE(*s
)))
156 * Search the environment for a variable.
157 * Return the value, if found, or NULL, if not found.
159 char *fw_getenv (char *name
)
163 for (env
= environment
.data
; *env
; env
= nxt
+ 1) {
166 for (nxt
= env
; *nxt
; ++nxt
) {
167 if (nxt
>= &environment
.data
[ENV_SIZE
]) {
168 fprintf (stderr
, "## Error: "
169 "environment not terminated\n");
173 val
= envmatch (name
, env
);
182 * Search the default environment for a variable.
183 * Return the value, if found, or NULL, if not found.
185 char *fw_getdefenv(char *name
)
189 for (env
= default_environment
; *env
; env
= nxt
+ 1) {
192 for (nxt
= env
; *nxt
; ++nxt
) {
193 if (nxt
>= &default_environment
[ENV_SIZE
]) {
194 fprintf(stderr
, "## Error: "
195 "default environment not terminated\n");
199 val
= envmatch(name
, env
);
207 static int parse_aes_key(char *key
)
209 char tmp
[5] = { '0', 'x', 0, 0, 0 };
213 if (strnlen(key
, 64) != 32) {
215 "## Error: '-a' option requires 16-byte AES key\n");
219 for (i
= 0; i
< 16; i
++) {
223 ul
= strtoul(tmp
, NULL
, 16);
226 "## Error: '-a' option requires valid AES key\n");
229 aes_key
[i
] = ul
& 0xff;
238 * Print the current definition of one, or more, or all
239 * environment variables
241 int fw_printenv (int argc
, char *argv
[])
247 if (argc
>= 2 && strcmp(argv
[1], "-a") == 0) {
250 "## Error: '-a' option requires AES key\n");
253 rc
= parse_aes_key(argv
[2]);
263 if (argc
== 1) { /* Print all env variables */
264 for (env
= environment
.data
; *env
; env
= nxt
+ 1) {
265 for (nxt
= env
; *nxt
; ++nxt
) {
266 if (nxt
>= &environment
.data
[ENV_SIZE
]) {
267 fprintf (stderr
, "## Error: "
268 "environment not terminated\n");
273 printf ("%s\n", env
);
278 if (strcmp (argv
[1], "-n") == 0) {
283 fprintf (stderr
, "## Error: "
284 "`-n' option requires exactly one argument\n");
291 for (i
= 1; i
< argc
; ++i
) { /* print single env variables */
292 char *name
= argv
[i
];
295 for (env
= environment
.data
; *env
; env
= nxt
+ 1) {
297 for (nxt
= env
; *nxt
; ++nxt
) {
298 if (nxt
>= &environment
.data
[ENV_SIZE
]) {
299 fprintf (stderr
, "## Error: "
300 "environment not terminated\n");
304 val
= envmatch (name
, env
);
307 fputs (name
, stdout
);
315 fprintf (stderr
, "## Error: \"%s\" not defined\n", name
);
323 int fw_env_close(void)
327 ret
= env_aes_cbc_crypt(environment
.data
, 1);
330 "Error: can't encrypt env for flash\n");
338 *environment
.crc
= crc32(0, (uint8_t *) environment
.data
, ENV_SIZE
);
340 /* write environment back to flash */
341 if (flash_io(O_RDWR
)) {
343 "Error: can't write fw_env to flash\n");
352 * Set/Clear a single variable in the environment.
353 * This is called in sequence to update the environment
354 * in RAM without updating the copy in flash after each set
356 int fw_env_write(char *name
, char *value
)
361 int deleting
, creating
, overwriting
;
364 * search if variable with this name already exists
366 for (nxt
= env
= environment
.data
; *env
; env
= nxt
+ 1) {
367 for (nxt
= env
; *nxt
; ++nxt
) {
368 if (nxt
>= &environment
.data
[ENV_SIZE
]) {
369 fprintf(stderr
, "## Error: "
370 "environment not terminated\n");
375 if ((oldval
= envmatch (name
, env
)) != NULL
)
379 deleting
= (oldval
&& !(value
&& strlen(value
)));
380 creating
= (!oldval
&& (value
&& strlen(value
)));
381 overwriting
= (oldval
&& (value
&& strlen(value
)));
383 /* check for permission */
385 if (env_flags_validate_varaccess(name
,
386 ENV_FLAGS_VARACCESS_PREVENT_DELETE
)) {
387 printf("Can't delete \"%s\"\n", name
);
391 } else if (overwriting
) {
392 if (env_flags_validate_varaccess(name
,
393 ENV_FLAGS_VARACCESS_PREVENT_OVERWR
)) {
394 printf("Can't overwrite \"%s\"\n", name
);
397 } else if (env_flags_validate_varaccess(name
,
398 ENV_FLAGS_VARACCESS_PREVENT_NONDEF_OVERWR
)) {
399 const char *defval
= fw_getdefenv(name
);
403 if (strcmp(oldval
, defval
)
405 printf("Can't overwrite \"%s\"\n", name
);
410 } else if (creating
) {
411 if (env_flags_validate_varaccess(name
,
412 ENV_FLAGS_VARACCESS_PREVENT_CREATE
)) {
413 printf("Can't create \"%s\"\n", name
);
421 if (deleting
|| overwriting
) {
422 if (*++nxt
== '\0') {
427 if ((*env
== '\0') && (*nxt
== '\0'))
436 if (!value
|| !strlen(value
))
440 * Append new definition at the end
442 for (env
= environment
.data
; *env
|| *(env
+ 1); ++env
);
443 if (env
> environment
.data
)
447 * "name" + "=" + "val" +"\0\0" > CUR_ENVSIZE - (env-environment)
449 len
= strlen (name
) + 2;
450 /* add '=' for first arg, ' ' for all others */
451 len
+= strlen(value
) + 1;
453 if (len
> (&environment
.data
[ENV_SIZE
] - env
)) {
455 "Error: environment overflow, \"%s\" deleted\n",
460 while ((*env
= *name
++) != '\0')
463 while ((*++env
= *value
++) != '\0')
466 /* end is marked with double '\0' */
473 * Deletes or sets environment variables. Returns -1 and sets errno error codes:
475 * EINVAL - need at least 1 argument
476 * EROFS - certain variables ("ethaddr", "serial#") cannot be
477 * modified or deleted
480 int fw_setenv(int argc
, char *argv
[])
492 if (strcmp(argv
[1], "-a") == 0) {
495 "## Error: '-a' option requires AES key\n");
498 rc
= parse_aes_key(argv
[2]);
511 fprintf(stderr
, "Error: environment not initialized\n");
517 if (env_flags_validate_env_set_params(argc
, argv
) < 0)
521 for (i
= 2; i
< argc
; ++i
) {
523 size_t val_len
= strlen(val
);
526 value
[len
- 1] = ' ';
527 value
= realloc(value
, len
+ val_len
+ 1);
530 "Cannot malloc %zu bytes: %s\n",
531 len
, strerror(errno
));
535 memcpy(value
+ len
, val
, val_len
);
540 fw_env_write(name
, value
);
544 return fw_env_close();
548 * Parse a file and configure the u-boot variables.
549 * The script file has a very simple format, as follows:
551 * Each line has a couple with name, value:
552 * <white spaces>variable_name<white spaces>variable_value
554 * Both variable_name and variable_value are interpreted as strings.
555 * Any character after <white spaces> and before ending \r\n is interpreted
556 * as variable's value (no comment allowed on these lines !)
558 * Comments are allowed if the first character in the line is #
560 * Returns -1 and sets errno error codes:
564 int fw_parse_script(char *fname
)
567 char dump
[1024]; /* Maximum line length in the file */
575 fprintf(stderr
, "Error: environment not initialized\n");
579 if (strcmp(fname
, "-") == 0)
582 fp
= fopen(fname
, "r");
584 fprintf(stderr
, "I cannot open %s for reading\n",
590 while (fgets(dump
, sizeof(dump
), fp
)) {
595 * Read a whole line from the file. If the line is too long
596 * or is not terminated, reports an error and exit.
598 if (dump
[len
- 1] != '\n') {
600 "Line %d not corrected terminated or too long\n",
606 /* Drop ending line feed / carriage return */
607 while (len
> 0 && (dump
[len
- 1] == '\n' ||
608 dump
[len
- 1] == '\r')) {
609 dump
[len
- 1] = '\0';
613 /* Skip comment or empty lines */
614 if ((len
== 0) || dump
[0] == '#')
618 * Search for variable's name,
619 * remove leading whitespaces
621 name
= fw_string_blank(dump
, 1);
625 /* The first white space is the end of variable name */
626 val
= fw_string_blank(name
, 0);
630 if ((val
- name
) < len
)
631 val
= fw_string_blank(val
, 1);
637 fprintf(stderr
, "Setting %s : %s\n",
638 name
, val
? val
: " removed");
641 if (env_flags_validate_type(name
, val
) < 0) {
647 * If there is an error setting a variable,
648 * try to save the environment and returns an error
650 if (fw_env_write(name
, val
)) {
652 "fw_env_write returns with error : %s\n",
660 /* Close file if not stdin */
661 if (strcmp(fname
, "-") != 0)
664 ret
|= fw_env_close();
671 * Test for bad block on NAND, just returns 0 on NOR, on NAND:
674 * < 0 - failed to test
676 static int flash_bad_block (int fd
, uint8_t mtd_type
, loff_t
*blockstart
)
678 if (mtd_type
== MTD_NANDFLASH
) {
679 int badblock
= ioctl (fd
, MEMGETBADBLOCK
, blockstart
);
682 perror ("Cannot read bad block mark");
688 fprintf (stderr
, "Bad block at 0x%llx, "
689 "skipping\n", *blockstart
);
699 * Read data from flash at an offset into a provided buffer. On NAND it skips
700 * bad blocks but makes sure it stays within ENVSECTORS (dev) starting from
701 * the DEVOFFSET (dev) block. On NOR the loop is only run once.
703 static int flash_read_buf (int dev
, int fd
, void *buf
, size_t count
,
704 off_t offset
, uint8_t mtd_type
)
706 size_t blocklen
; /* erase / write length - one block on NAND,
708 size_t processed
= 0; /* progress counter */
709 size_t readlen
= count
; /* current read length */
710 off_t top_of_range
; /* end of the last block we may use */
711 off_t block_seek
; /* offset inside the current block to the start
713 loff_t blockstart
; /* running start of the current block -
714 MEMGETBADBLOCK needs 64 bits */
717 blockstart
= (offset
/ DEVESIZE (dev
)) * DEVESIZE (dev
);
719 /* Offset inside a block */
720 block_seek
= offset
- blockstart
;
722 if (mtd_type
== MTD_NANDFLASH
) {
724 * NAND: calculate which blocks we are reading. We have
725 * to read one block at a time to skip bad blocks.
727 blocklen
= DEVESIZE (dev
);
730 * To calculate the top of the range, we have to use the
731 * global DEVOFFSET (dev), which can be different from offset
733 top_of_range
= ((DEVOFFSET(dev
) / blocklen
) +
734 ENVSECTORS (dev
)) * blocklen
;
736 /* Limit to one block for the first read */
737 if (readlen
> blocklen
- block_seek
)
738 readlen
= blocklen
- block_seek
;
741 top_of_range
= offset
+ count
;
744 /* This only runs once on NOR flash */
745 while (processed
< count
) {
746 rc
= flash_bad_block (fd
, mtd_type
, &blockstart
);
747 if (rc
< 0) /* block test failed */
750 if (blockstart
+ block_seek
+ readlen
> top_of_range
) {
751 /* End of range is reached */
753 "Too few good blocks within range\n");
757 if (rc
) { /* block is bad */
758 blockstart
+= blocklen
;
763 * If a block is bad, we retry in the next block at the same
764 * offset - see common/env_nand.c::writeenv()
766 lseek (fd
, blockstart
+ block_seek
, SEEK_SET
);
768 rc
= read (fd
, buf
+ processed
, readlen
);
770 fprintf (stderr
, "Read error on %s: %s\n",
771 DEVNAME (dev
), strerror (errno
));
775 fprintf(stderr
, "Read 0x%x bytes at 0x%llx on %s\n",
776 rc
, blockstart
+ block_seek
, DEVNAME(dev
));
778 processed
+= readlen
;
779 readlen
= min (blocklen
, count
- processed
);
781 blockstart
+= blocklen
;
788 * Write count bytes at offset, but stay within ENVSECTORS (dev) sectors of
789 * DEVOFFSET (dev). Similar to the read case above, on NOR and dataflash we
790 * erase and write the whole data at once.
792 static int flash_write_buf (int dev
, int fd
, void *buf
, size_t count
,
793 off_t offset
, uint8_t mtd_type
)
796 struct erase_info_user erase
;
797 size_t blocklen
; /* length of NAND block / NOR erase sector */
798 size_t erase_len
; /* whole area that can be erased - may include
800 size_t erasesize
; /* erase / write length - one block on NAND,
802 size_t processed
= 0; /* progress counter */
803 size_t write_total
; /* total size to actually write - excluding
805 off_t erase_offset
; /* offset to the first erase block (aligned)
807 off_t block_seek
; /* offset inside the erase block to the start
809 off_t top_of_range
; /* end of the last block we may use */
810 loff_t blockstart
; /* running start of the current block -
811 MEMGETBADBLOCK needs 64 bits */
815 * For mtd devices only offset and size of the environment do matter
817 if (mtd_type
== MTD_ABSENT
) {
819 top_of_range
= offset
+ count
;
820 erase_len
= blocklen
;
823 write_total
= blocklen
;
825 blocklen
= DEVESIZE(dev
);
827 top_of_range
= ((DEVOFFSET(dev
) / blocklen
) +
828 ENVSECTORS(dev
)) * blocklen
;
830 erase_offset
= (offset
/ blocklen
) * blocklen
;
832 /* Maximum area we may use */
833 erase_len
= top_of_range
- erase_offset
;
835 blockstart
= erase_offset
;
836 /* Offset inside a block */
837 block_seek
= offset
- erase_offset
;
840 * Data size we actually write: from the start of the block
841 * to the start of the data, then count bytes of data, and
842 * to the end of the block
844 write_total
= ((block_seek
+ count
+ blocklen
- 1) /
845 blocklen
) * blocklen
;
849 * Support data anywhere within erase sectors: read out the complete
850 * area to be erased, replace the environment image, write the whole
853 if (write_total
> count
) {
854 data
= malloc (erase_len
);
857 "Cannot malloc %zu bytes: %s\n",
858 erase_len
, strerror (errno
));
862 rc
= flash_read_buf (dev
, fd
, data
, write_total
, erase_offset
,
864 if (write_total
!= rc
)
868 fprintf(stderr
, "Preserving data ");
870 fprintf(stderr
, "0x%x - 0x%lx", 0, block_seek
- 1);
871 if (block_seek
+ count
!= write_total
) {
873 fprintf(stderr
, " and ");
874 fprintf(stderr
, "0x%lx - 0x%x",
875 block_seek
+ count
, write_total
- 1);
877 fprintf(stderr
, "\n");
879 /* Overwrite the old environment */
880 memcpy (data
+ block_seek
, buf
, count
);
883 * We get here, iff offset is block-aligned and count is a
884 * multiple of blocklen - see write_total calculation above
889 if (mtd_type
== MTD_NANDFLASH
) {
891 * NAND: calculate which blocks we are writing. We have
892 * to write one block at a time to skip bad blocks.
894 erasesize
= blocklen
;
896 erasesize
= erase_len
;
899 erase
.length
= erasesize
;
901 /* This only runs once on NOR flash and SPI-dataflash */
902 while (processed
< write_total
) {
903 rc
= flash_bad_block (fd
, mtd_type
, &blockstart
);
904 if (rc
< 0) /* block test failed */
907 if (blockstart
+ erasesize
> top_of_range
) {
908 fprintf (stderr
, "End of range reached, aborting\n");
912 if (rc
) { /* block is bad */
913 blockstart
+= blocklen
;
917 if (mtd_type
!= MTD_ABSENT
) {
918 erase
.start
= blockstart
;
919 ioctl(fd
, MEMUNLOCK
, &erase
);
920 /* These do not need an explicit erase cycle */
921 if (mtd_type
!= MTD_DATAFLASH
)
922 if (ioctl(fd
, MEMERASE
, &erase
) != 0) {
924 "MTD erase error on %s: %s\n",
925 DEVNAME(dev
), strerror(errno
));
930 if (lseek (fd
, blockstart
, SEEK_SET
) == -1) {
932 "Seek error on %s: %s\n",
933 DEVNAME (dev
), strerror (errno
));
938 fprintf(stderr
, "Write 0x%x bytes at 0x%llx\n", erasesize
,
941 if (write (fd
, data
+ processed
, erasesize
) != erasesize
) {
942 fprintf (stderr
, "Write error on %s: %s\n",
943 DEVNAME (dev
), strerror (errno
));
947 if (mtd_type
!= MTD_ABSENT
)
948 ioctl(fd
, MEMLOCK
, &erase
);
950 processed
+= erasesize
;
952 blockstart
+= erasesize
;
955 if (write_total
> count
)
962 * Set obsolete flag at offset - NOR flash only
964 static int flash_flag_obsolete (int dev
, int fd
, off_t offset
)
967 struct erase_info_user erase
;
969 erase
.start
= DEVOFFSET (dev
);
970 erase
.length
= DEVESIZE (dev
);
971 /* This relies on the fact, that obsolete_flag == 0 */
972 rc
= lseek (fd
, offset
, SEEK_SET
);
974 fprintf (stderr
, "Cannot seek to set the flag on %s \n",
978 ioctl (fd
, MEMUNLOCK
, &erase
);
979 rc
= write (fd
, &obsolete_flag
, sizeof (obsolete_flag
));
980 ioctl (fd
, MEMLOCK
, &erase
);
982 perror ("Could not set obsolete flag");
987 /* Encrypt or decrypt the environment before writing or reading it. */
988 static int env_aes_cbc_crypt(char *payload
, const int enc
)
990 uint8_t *data
= (uint8_t *)payload
;
991 const int len
= getenvsize();
992 uint8_t key_exp
[AES_EXPAND_KEY_LENGTH
];
995 /* First we expand the key. */
996 aes_expand_key(aes_key
, key_exp
);
998 /* Calculate the number of AES blocks to encrypt. */
999 aes_blocks
= DIV_ROUND_UP(len
, AES_KEY_LENGTH
);
1002 aes_cbc_encrypt_blocks(key_exp
, data
, data
, aes_blocks
);
1004 aes_cbc_decrypt_blocks(key_exp
, data
, data
, aes_blocks
);
1009 static int flash_write (int fd_current
, int fd_target
, int dev_target
)
1013 switch (environment
.flag_scheme
) {
1016 case FLAG_INCREMENTAL
:
1017 (*environment
.flags
)++;
1020 *environment
.flags
= active_flag
;
1023 fprintf (stderr
, "Unimplemented flash scheme %u \n",
1024 environment
.flag_scheme
);
1029 fprintf(stderr
, "Writing new environment at 0x%lx on %s\n",
1030 DEVOFFSET (dev_target
), DEVNAME (dev_target
));
1033 rc
= flash_write_buf(dev_target
, fd_target
, environment
.image
,
1034 CUR_ENVSIZE
, DEVOFFSET(dev_target
),
1035 DEVTYPE(dev_target
));
1039 if (environment
.flag_scheme
== FLAG_BOOLEAN
) {
1040 /* Have to set obsolete flag */
1041 off_t offset
= DEVOFFSET (dev_current
) +
1042 offsetof (struct env_image_redundant
, flags
);
1045 "Setting obsolete flag in environment at 0x%lx on %s\n",
1046 DEVOFFSET (dev_current
), DEVNAME (dev_current
));
1048 flash_flag_obsolete (dev_current
, fd_current
, offset
);
1054 static int flash_read (int fd
)
1056 struct mtd_info_user mtdinfo
;
1060 rc
= fstat(fd
, &st
);
1062 fprintf(stderr
, "Cannot stat the file %s\n",
1063 DEVNAME(dev_current
));
1067 if (S_ISCHR(st
.st_mode
)) {
1068 rc
= ioctl(fd
, MEMGETINFO
, &mtdinfo
);
1070 fprintf(stderr
, "Cannot get MTD information for %s\n",
1071 DEVNAME(dev_current
));
1074 if (mtdinfo
.type
!= MTD_NORFLASH
&&
1075 mtdinfo
.type
!= MTD_NANDFLASH
&&
1076 mtdinfo
.type
!= MTD_DATAFLASH
&&
1077 mtdinfo
.type
!= MTD_UBIVOLUME
) {
1078 fprintf (stderr
, "Unsupported flash type %u on %s\n",
1079 mtdinfo
.type
, DEVNAME(dev_current
));
1083 memset(&mtdinfo
, 0, sizeof(mtdinfo
));
1084 mtdinfo
.type
= MTD_ABSENT
;
1087 DEVTYPE(dev_current
) = mtdinfo
.type
;
1089 rc
= flash_read_buf(dev_current
, fd
, environment
.image
, CUR_ENVSIZE
,
1090 DEVOFFSET (dev_current
), mtdinfo
.type
);
1091 if (rc
!= CUR_ENVSIZE
)
1097 static int flash_io (int mode
)
1099 int fd_current
, fd_target
, rc
, dev_target
;
1101 /* dev_current: fd_current, erase_current */
1102 fd_current
= open (DEVNAME (dev_current
), mode
);
1103 if (fd_current
< 0) {
1105 "Can't open %s: %s\n",
1106 DEVNAME (dev_current
), strerror (errno
));
1110 if (mode
== O_RDWR
) {
1111 if (HaveRedundEnv
) {
1112 /* switch to next partition for writing */
1113 dev_target
= !dev_current
;
1114 /* dev_target: fd_target, erase_target */
1115 fd_target
= open (DEVNAME (dev_target
), mode
);
1116 if (fd_target
< 0) {
1118 "Can't open %s: %s\n",
1119 DEVNAME (dev_target
),
1125 dev_target
= dev_current
;
1126 fd_target
= fd_current
;
1129 rc
= flash_write (fd_current
, fd_target
, dev_target
);
1131 if (HaveRedundEnv
) {
1132 if (close (fd_target
)) {
1134 "I/O error on %s: %s\n",
1135 DEVNAME (dev_target
),
1141 rc
= flash_read (fd_current
);
1145 if (close (fd_current
)) {
1147 "I/O error on %s: %s\n",
1148 DEVNAME (dev_current
), strerror (errno
));
1156 * s1 is either a simple 'name', or a 'name=value' pair.
1157 * s2 is a 'name=value' pair.
1158 * If the names match, return the value of s2, else NULL.
1161 static char *envmatch (char * s1
, char * s2
)
1163 if (s1
== NULL
|| s2
== NULL
)
1166 while (*s1
== *s2
++)
1169 if (*s1
== '\0' && *(s2
- 1) == '=')
1175 * Prevent confusion if running from erased flash memory
1177 int fw_env_open(void)
1180 unsigned char flag0
;
1184 unsigned char flag1
;
1189 struct env_image_single
*single
;
1190 struct env_image_redundant
*redundant
;
1192 if (parse_config ()) /* should fill envdevices */
1195 addr0
= calloc(1, CUR_ENVSIZE
);
1196 if (addr0
== NULL
) {
1198 "Not enough memory for environment (%ld bytes)\n",
1203 /* read environment from FLASH to local buffer */
1204 environment
.image
= addr0
;
1206 if (HaveRedundEnv
) {
1208 environment
.crc
= &redundant
->crc
;
1209 environment
.flags
= &redundant
->flags
;
1210 environment
.data
= redundant
->data
;
1213 environment
.crc
= &single
->crc
;
1214 environment
.flags
= NULL
;
1215 environment
.data
= single
->data
;
1219 if (flash_io (O_RDONLY
))
1222 crc0
= crc32 (0, (uint8_t *) environment
.data
, ENV_SIZE
);
1225 ret
= env_aes_cbc_crypt(environment
.data
, 0);
1230 crc0_ok
= (crc0
== *environment
.crc
);
1231 if (!HaveRedundEnv
) {
1234 "Warning: Bad CRC, using default environment\n");
1235 memcpy(environment
.data
, default_environment
, sizeof default_environment
);
1238 flag0
= *environment
.flags
;
1241 addr1
= calloc(1, CUR_ENVSIZE
);
1242 if (addr1
== NULL
) {
1244 "Not enough memory for environment (%ld bytes)\n",
1251 * have to set environment.image for flash_read(), careful -
1252 * other pointers in environment still point inside addr0
1254 environment
.image
= addr1
;
1255 if (flash_io (O_RDONLY
))
1258 /* Check flag scheme compatibility */
1259 if (DEVTYPE(dev_current
) == MTD_NORFLASH
&&
1260 DEVTYPE(!dev_current
) == MTD_NORFLASH
) {
1261 environment
.flag_scheme
= FLAG_BOOLEAN
;
1262 } else if (DEVTYPE(dev_current
) == MTD_NANDFLASH
&&
1263 DEVTYPE(!dev_current
) == MTD_NANDFLASH
) {
1264 environment
.flag_scheme
= FLAG_INCREMENTAL
;
1265 } else if (DEVTYPE(dev_current
) == MTD_DATAFLASH
&&
1266 DEVTYPE(!dev_current
) == MTD_DATAFLASH
) {
1267 environment
.flag_scheme
= FLAG_BOOLEAN
;
1268 } else if (DEVTYPE(dev_current
) == MTD_UBIVOLUME
&&
1269 DEVTYPE(!dev_current
) == MTD_UBIVOLUME
) {
1270 environment
.flag_scheme
= FLAG_INCREMENTAL
;
1271 } else if (DEVTYPE(dev_current
) == MTD_ABSENT
&&
1272 DEVTYPE(!dev_current
) == MTD_ABSENT
) {
1273 environment
.flag_scheme
= FLAG_INCREMENTAL
;
1275 fprintf (stderr
, "Incompatible flash types!\n");
1279 crc1
= crc32 (0, (uint8_t *) redundant
->data
, ENV_SIZE
);
1282 ret
= env_aes_cbc_crypt(redundant
->data
, 0);
1287 crc1_ok
= (crc1
== redundant
->crc
);
1288 flag1
= redundant
->flags
;
1290 if (crc0_ok
&& !crc1_ok
) {
1292 } else if (!crc0_ok
&& crc1_ok
) {
1294 } else if (!crc0_ok
&& !crc1_ok
) {
1296 "Warning: Bad CRC, using default environment\n");
1297 memcpy (environment
.data
, default_environment
,
1298 sizeof default_environment
);
1301 switch (environment
.flag_scheme
) {
1303 if (flag0
== active_flag
&&
1304 flag1
== obsolete_flag
) {
1306 } else if (flag0
== obsolete_flag
&&
1307 flag1
== active_flag
) {
1309 } else if (flag0
== flag1
) {
1311 } else if (flag0
== 0xFF) {
1313 } else if (flag1
== 0xFF) {
1319 case FLAG_INCREMENTAL
:
1320 if (flag0
== 255 && flag1
== 0)
1322 else if ((flag1
== 255 && flag0
== 0) ||
1325 else /* flag1 > flag0 */
1329 fprintf (stderr
, "Unknown flag scheme %u \n",
1330 environment
.flag_scheme
);
1336 * If we are reading, we don't need the flag and the CRC any
1337 * more, if we are writing, we will re-calculate CRC and update
1338 * flags before writing out
1341 environment
.image
= addr1
;
1342 environment
.crc
= &redundant
->crc
;
1343 environment
.flags
= &redundant
->flags
;
1344 environment
.data
= redundant
->data
;
1347 environment
.image
= addr0
;
1348 /* Other pointers are already set */
1352 fprintf(stderr
, "Selected env in %s\n", DEVNAME(dev_current
));
1359 static int parse_config ()
1363 #if defined(CONFIG_FILE)
1364 /* Fills in DEVNAME(), ENVSIZE(), DEVESIZE(). Or don't. */
1365 if (get_config (CONFIG_FILE
)) {
1367 "Cannot parse config file: %s\n", strerror (errno
));
1371 DEVNAME (0) = DEVICE1_NAME
;
1372 DEVOFFSET (0) = DEVICE1_OFFSET
;
1373 ENVSIZE (0) = ENV1_SIZE
;
1374 /* Default values are: erase-size=env-size */
1375 DEVESIZE (0) = ENVSIZE (0);
1376 /* #sectors=env-size/erase-size (rounded up) */
1377 ENVSECTORS (0) = (ENVSIZE(0) + DEVESIZE(0) - 1) / DEVESIZE(0);
1378 #ifdef DEVICE1_ESIZE
1379 DEVESIZE (0) = DEVICE1_ESIZE
;
1381 #ifdef DEVICE1_ENVSECTORS
1382 ENVSECTORS (0) = DEVICE1_ENVSECTORS
;
1386 DEVNAME (1) = DEVICE2_NAME
;
1387 DEVOFFSET (1) = DEVICE2_OFFSET
;
1388 ENVSIZE (1) = ENV2_SIZE
;
1389 /* Default values are: erase-size=env-size */
1390 DEVESIZE (1) = ENVSIZE (1);
1391 /* #sectors=env-size/erase-size (rounded up) */
1392 ENVSECTORS (1) = (ENVSIZE(1) + DEVESIZE(1) - 1) / DEVESIZE(1);
1393 #ifdef DEVICE2_ESIZE
1394 DEVESIZE (1) = DEVICE2_ESIZE
;
1396 #ifdef DEVICE2_ENVSECTORS
1397 ENVSECTORS (1) = DEVICE2_ENVSECTORS
;
1402 if (stat (DEVNAME (0), &st
)) {
1404 "Cannot access MTD device %s: %s\n",
1405 DEVNAME (0), strerror (errno
));
1409 if (HaveRedundEnv
&& stat (DEVNAME (1), &st
)) {
1411 "Cannot access MTD device %s: %s\n",
1412 DEVNAME (1), strerror (errno
));
1418 #if defined(CONFIG_FILE)
1419 static int get_config (char *fname
)
1427 fp
= fopen (fname
, "r");
1431 while (i
< 2 && fgets (dump
, sizeof (dump
), fp
)) {
1432 /* Skip incomplete conversions and comment strings */
1436 rc
= sscanf (dump
, "%ms %lx %lx %lx %lx",
1446 DEVNAME(i
) = devname
;
1449 /* Assume the erase size is the same as the env-size */
1450 DEVESIZE(i
) = ENVSIZE(i
);
1453 /* Assume enough env sectors to cover the environment */
1454 ENVSECTORS (i
) = (ENVSIZE(i
) + DEVESIZE(i
) - 1) / DEVESIZE(i
);
1460 HaveRedundEnv
= i
- 1;
1461 if (!i
) { /* No valid entries found */