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 *);
128 static inline ulong
getenvsize (void)
130 ulong rc
= CUR_ENVSIZE
- sizeof(uint32_t);
136 rc
&= ~(AES_KEY_LENGTH
- 1);
141 static char *fw_string_blank(char *s
, int noblank
)
146 for (i
= 0; i
< len
; i
++, s
++) {
147 if ((noblank
&& !WHITESPACE(*s
)) ||
148 (!noblank
&& WHITESPACE(*s
)))
158 * Search the environment for a variable.
159 * Return the value, if found, or NULL, if not found.
161 char *fw_getenv (char *name
)
165 for (env
= environment
.data
; *env
; env
= nxt
+ 1) {
168 for (nxt
= env
; *nxt
; ++nxt
) {
169 if (nxt
>= &environment
.data
[ENV_SIZE
]) {
170 fprintf (stderr
, "## Error: "
171 "environment not terminated\n");
175 val
= envmatch (name
, env
);
184 * Search the default environment for a variable.
185 * Return the value, if found, or NULL, if not found.
187 char *fw_getdefenv(char *name
)
191 for (env
= default_environment
; *env
; env
= nxt
+ 1) {
194 for (nxt
= env
; *nxt
; ++nxt
) {
195 if (nxt
>= &default_environment
[ENV_SIZE
]) {
196 fprintf(stderr
, "## Error: "
197 "default environment not terminated\n");
201 val
= envmatch(name
, env
);
209 static int parse_aes_key(char *key
)
211 char tmp
[5] = { '0', 'x', 0, 0, 0 };
215 if (strnlen(key
, 64) != 32) {
217 "## Error: '-a' option requires 16-byte AES key\n");
221 for (i
= 0; i
< 16; i
++) {
225 ul
= strtoul(tmp
, NULL
, 16);
228 "## Error: '-a' option requires valid AES key\n");
231 aes_key
[i
] = ul
& 0xff;
240 * Print the current definition of one, or more, or all
241 * environment variables
243 int fw_printenv (int argc
, char *argv
[])
249 if (argc
>= 2 && strcmp(argv
[1], "-a") == 0) {
252 "## Error: '-a' option requires AES key\n");
255 rc
= parse_aes_key(argv
[2]);
265 if (argc
== 1) { /* Print all env variables */
266 for (env
= environment
.data
; *env
; env
= nxt
+ 1) {
267 for (nxt
= env
; *nxt
; ++nxt
) {
268 if (nxt
>= &environment
.data
[ENV_SIZE
]) {
269 fprintf (stderr
, "## Error: "
270 "environment not terminated\n");
275 printf ("%s\n", env
);
280 if (strcmp (argv
[1], "-n") == 0) {
285 fprintf (stderr
, "## Error: "
286 "`-n' option requires exactly one argument\n");
293 for (i
= 1; i
< argc
; ++i
) { /* print single env variables */
294 char *name
= argv
[i
];
297 for (env
= environment
.data
; *env
; env
= nxt
+ 1) {
299 for (nxt
= env
; *nxt
; ++nxt
) {
300 if (nxt
>= &environment
.data
[ENV_SIZE
]) {
301 fprintf (stderr
, "## Error: "
302 "environment not terminated\n");
306 val
= envmatch (name
, env
);
309 fputs (name
, stdout
);
317 fprintf (stderr
, "## Error: \"%s\" not defined\n", name
);
325 int fw_env_close(void)
329 ret
= env_aes_cbc_crypt(environment
.data
, 1);
332 "Error: can't encrypt env for flash\n");
340 *environment
.crc
= crc32(0, (uint8_t *) environment
.data
, ENV_SIZE
);
342 /* write environment back to flash */
343 if (flash_io(O_RDWR
)) {
345 "Error: can't write fw_env to flash\n");
354 * Set/Clear a single variable in the environment.
355 * This is called in sequence to update the environment
356 * in RAM without updating the copy in flash after each set
358 int fw_env_write(char *name
, char *value
)
363 int deleting
, creating
, overwriting
;
366 * search if variable with this name already exists
368 for (nxt
= env
= environment
.data
; *env
; env
= nxt
+ 1) {
369 for (nxt
= env
; *nxt
; ++nxt
) {
370 if (nxt
>= &environment
.data
[ENV_SIZE
]) {
371 fprintf(stderr
, "## Error: "
372 "environment not terminated\n");
377 if ((oldval
= envmatch (name
, env
)) != NULL
)
381 deleting
= (oldval
&& !(value
&& strlen(value
)));
382 creating
= (!oldval
&& (value
&& strlen(value
)));
383 overwriting
= (oldval
&& (value
&& strlen(value
)));
385 /* check for permission */
387 if (env_flags_validate_varaccess(name
,
388 ENV_FLAGS_VARACCESS_PREVENT_DELETE
)) {
389 printf("Can't delete \"%s\"\n", name
);
393 } else if (overwriting
) {
394 if (env_flags_validate_varaccess(name
,
395 ENV_FLAGS_VARACCESS_PREVENT_OVERWR
)) {
396 printf("Can't overwrite \"%s\"\n", name
);
399 } else if (env_flags_validate_varaccess(name
,
400 ENV_FLAGS_VARACCESS_PREVENT_NONDEF_OVERWR
)) {
401 const char *defval
= fw_getdefenv(name
);
405 if (strcmp(oldval
, defval
)
407 printf("Can't overwrite \"%s\"\n", name
);
412 } else if (creating
) {
413 if (env_flags_validate_varaccess(name
,
414 ENV_FLAGS_VARACCESS_PREVENT_CREATE
)) {
415 printf("Can't create \"%s\"\n", name
);
423 if (deleting
|| overwriting
) {
424 if (*++nxt
== '\0') {
429 if ((*env
== '\0') && (*nxt
== '\0'))
438 if (!value
|| !strlen(value
))
442 * Append new definition at the end
444 for (env
= environment
.data
; *env
|| *(env
+ 1); ++env
);
445 if (env
> environment
.data
)
449 * "name" + "=" + "val" +"\0\0" > CUR_ENVSIZE - (env-environment)
451 len
= strlen (name
) + 2;
452 /* add '=' for first arg, ' ' for all others */
453 len
+= strlen(value
) + 1;
455 if (len
> (&environment
.data
[ENV_SIZE
] - env
)) {
457 "Error: environment overflow, \"%s\" deleted\n",
462 while ((*env
= *name
++) != '\0')
465 while ((*++env
= *value
++) != '\0')
468 /* end is marked with double '\0' */
475 * Deletes or sets environment variables. Returns -1 and sets errno error codes:
477 * EINVAL - need at least 1 argument
478 * EROFS - certain variables ("ethaddr", "serial#") cannot be
479 * modified or deleted
482 int fw_setenv(int argc
, char *argv
[])
494 if (strcmp(argv
[1], "-a") == 0) {
497 "## Error: '-a' option requires AES key\n");
500 rc
= parse_aes_key(argv
[2]);
513 fprintf(stderr
, "Error: environment not initialized\n");
519 if (env_flags_validate_env_set_params(argc
, argv
) < 0)
523 for (i
= 2; i
< argc
; ++i
) {
525 size_t val_len
= strlen(val
);
528 value
[len
- 1] = ' ';
529 value
= realloc(value
, len
+ val_len
+ 1);
532 "Cannot malloc %zu bytes: %s\n",
533 len
, strerror(errno
));
537 memcpy(value
+ len
, val
, val_len
);
542 fw_env_write(name
, value
);
546 return fw_env_close();
550 * Parse a file and configure the u-boot variables.
551 * The script file has a very simple format, as follows:
553 * Each line has a couple with name, value:
554 * <white spaces>variable_name<white spaces>variable_value
556 * Both variable_name and variable_value are interpreted as strings.
557 * Any character after <white spaces> and before ending \r\n is interpreted
558 * as variable's value (no comment allowed on these lines !)
560 * Comments are allowed if the first character in the line is #
562 * Returns -1 and sets errno error codes:
566 int fw_parse_script(char *fname
)
569 char dump
[1024]; /* Maximum line length in the file */
577 fprintf(stderr
, "Error: environment not initialized\n");
581 if (strcmp(fname
, "-") == 0)
584 fp
= fopen(fname
, "r");
586 fprintf(stderr
, "I cannot open %s for reading\n",
592 while (fgets(dump
, sizeof(dump
), fp
)) {
597 * Read a whole line from the file. If the line is too long
598 * or is not terminated, reports an error and exit.
600 if (dump
[len
- 1] != '\n') {
602 "Line %d not corrected terminated or too long\n",
608 /* Drop ending line feed / carriage return */
609 while (len
> 0 && (dump
[len
- 1] == '\n' ||
610 dump
[len
- 1] == '\r')) {
611 dump
[len
- 1] = '\0';
615 /* Skip comment or empty lines */
616 if ((len
== 0) || dump
[0] == '#')
620 * Search for variable's name,
621 * remove leading whitespaces
623 name
= fw_string_blank(dump
, 1);
627 /* The first white space is the end of variable name */
628 val
= fw_string_blank(name
, 0);
632 if ((val
- name
) < len
)
633 val
= fw_string_blank(val
, 1);
639 fprintf(stderr
, "Setting %s : %s\n",
640 name
, val
? val
: " removed");
643 if (env_flags_validate_type(name
, val
) < 0) {
649 * If there is an error setting a variable,
650 * try to save the environment and returns an error
652 if (fw_env_write(name
, val
)) {
654 "fw_env_write returns with error : %s\n",
662 /* Close file if not stdin */
663 if (strcmp(fname
, "-") != 0)
666 ret
|= fw_env_close();
673 * Test for bad block on NAND, just returns 0 on NOR, on NAND:
676 * < 0 - failed to test
678 static int flash_bad_block (int fd
, uint8_t mtd_type
, loff_t
*blockstart
)
680 if (mtd_type
== MTD_NANDFLASH
) {
681 int badblock
= ioctl (fd
, MEMGETBADBLOCK
, blockstart
);
684 perror ("Cannot read bad block mark");
690 fprintf (stderr
, "Bad block at 0x%llx, "
691 "skipping\n", *blockstart
);
701 * Read data from flash at an offset into a provided buffer. On NAND it skips
702 * bad blocks but makes sure it stays within ENVSECTORS (dev) starting from
703 * the DEVOFFSET (dev) block. On NOR the loop is only run once.
705 static int flash_read_buf (int dev
, int fd
, void *buf
, size_t count
,
706 off_t offset
, uint8_t mtd_type
)
708 size_t blocklen
; /* erase / write length - one block on NAND,
710 size_t processed
= 0; /* progress counter */
711 size_t readlen
= count
; /* current read length */
712 off_t top_of_range
; /* end of the last block we may use */
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 (mtd_type
== 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
);
732 * To calculate the top of the range, we have to use the
733 * global DEVOFFSET (dev), which can be different from offset
735 top_of_range
= ((DEVOFFSET(dev
) / blocklen
) +
736 ENVSECTORS (dev
)) * blocklen
;
738 /* Limit to one block for the first read */
739 if (readlen
> blocklen
- block_seek
)
740 readlen
= blocklen
- block_seek
;
743 top_of_range
= offset
+ count
;
746 /* This only runs once on NOR flash */
747 while (processed
< count
) {
748 rc
= flash_bad_block (fd
, mtd_type
, &blockstart
);
749 if (rc
< 0) /* block test failed */
752 if (blockstart
+ block_seek
+ readlen
> top_of_range
) {
753 /* End of range is reached */
755 "Too few good blocks within range\n");
759 if (rc
) { /* block is bad */
760 blockstart
+= blocklen
;
765 * If a block is bad, we retry in the next block at the same
766 * offset - see common/env_nand.c::writeenv()
768 lseek (fd
, blockstart
+ block_seek
, SEEK_SET
);
770 rc
= read (fd
, buf
+ processed
, readlen
);
772 fprintf (stderr
, "Read error on %s: %s\n",
773 DEVNAME (dev
), strerror (errno
));
777 fprintf(stderr
, "Read 0x%x bytes at 0x%llx on %s\n",
778 rc
, blockstart
+ block_seek
, DEVNAME(dev
));
780 processed
+= readlen
;
781 readlen
= min (blocklen
, count
- processed
);
783 blockstart
+= blocklen
;
790 * Write count bytes at offset, but stay within ENVSECTORS (dev) sectors of
791 * DEVOFFSET (dev). Similar to the read case above, on NOR and dataflash we
792 * erase and write the whole data at once.
794 static int flash_write_buf (int dev
, int fd
, void *buf
, size_t count
,
795 off_t offset
, uint8_t mtd_type
)
798 struct erase_info_user erase
;
799 size_t blocklen
; /* length of NAND block / NOR erase sector */
800 size_t erase_len
; /* whole area that can be erased - may include
802 size_t erasesize
; /* erase / write length - one block on NAND,
804 size_t processed
= 0; /* progress counter */
805 size_t write_total
; /* total size to actually write - excluding
807 off_t erase_offset
; /* offset to the first erase block (aligned)
809 off_t block_seek
; /* offset inside the erase block to the start
811 off_t top_of_range
; /* end of the last block we may use */
812 loff_t blockstart
; /* running start of the current block -
813 MEMGETBADBLOCK needs 64 bits */
817 * For mtd devices only offset and size of the environment do matter
819 if (mtd_type
== MTD_ABSENT
) {
821 top_of_range
= offset
+ count
;
822 erase_len
= blocklen
;
825 write_total
= blocklen
;
827 blocklen
= DEVESIZE(dev
);
829 top_of_range
= ((DEVOFFSET(dev
) / blocklen
) +
830 ENVSECTORS(dev
)) * blocklen
;
832 erase_offset
= (offset
/ blocklen
) * blocklen
;
834 /* Maximum area we may use */
835 erase_len
= top_of_range
- erase_offset
;
837 blockstart
= erase_offset
;
838 /* Offset inside a block */
839 block_seek
= offset
- erase_offset
;
842 * Data size we actually write: from the start of the block
843 * to the start of the data, then count bytes of data, and
844 * to the end of the block
846 write_total
= ((block_seek
+ count
+ blocklen
- 1) /
847 blocklen
) * blocklen
;
851 * Support data anywhere within erase sectors: read out the complete
852 * area to be erased, replace the environment image, write the whole
855 if (write_total
> count
) {
856 data
= malloc (erase_len
);
859 "Cannot malloc %zu bytes: %s\n",
860 erase_len
, strerror (errno
));
864 rc
= flash_read_buf (dev
, fd
, data
, write_total
, erase_offset
,
866 if (write_total
!= rc
)
870 fprintf(stderr
, "Preserving data ");
872 fprintf(stderr
, "0x%x - 0x%lx", 0, block_seek
- 1);
873 if (block_seek
+ count
!= write_total
) {
875 fprintf(stderr
, " and ");
876 fprintf(stderr
, "0x%lx - 0x%x",
877 block_seek
+ count
, write_total
- 1);
879 fprintf(stderr
, "\n");
881 /* Overwrite the old environment */
882 memcpy (data
+ block_seek
, buf
, count
);
885 * We get here, iff offset is block-aligned and count is a
886 * multiple of blocklen - see write_total calculation above
891 if (mtd_type
== MTD_NANDFLASH
) {
893 * NAND: calculate which blocks we are writing. We have
894 * to write one block at a time to skip bad blocks.
896 erasesize
= blocklen
;
898 erasesize
= erase_len
;
901 erase
.length
= erasesize
;
903 /* This only runs once on NOR flash and SPI-dataflash */
904 while (processed
< write_total
) {
905 rc
= flash_bad_block (fd
, mtd_type
, &blockstart
);
906 if (rc
< 0) /* block test failed */
909 if (blockstart
+ erasesize
> top_of_range
) {
910 fprintf (stderr
, "End of range reached, aborting\n");
914 if (rc
) { /* block is bad */
915 blockstart
+= blocklen
;
919 if (mtd_type
!= MTD_ABSENT
) {
920 erase
.start
= blockstart
;
921 ioctl(fd
, MEMUNLOCK
, &erase
);
922 /* These do not need an explicit erase cycle */
923 if (mtd_type
!= MTD_DATAFLASH
)
924 if (ioctl(fd
, MEMERASE
, &erase
) != 0) {
926 "MTD erase error on %s: %s\n",
927 DEVNAME(dev
), strerror(errno
));
932 if (lseek (fd
, blockstart
, SEEK_SET
) == -1) {
934 "Seek error on %s: %s\n",
935 DEVNAME (dev
), strerror (errno
));
940 fprintf(stderr
, "Write 0x%x bytes at 0x%llx\n", erasesize
,
943 if (write (fd
, data
+ processed
, erasesize
) != erasesize
) {
944 fprintf (stderr
, "Write error on %s: %s\n",
945 DEVNAME (dev
), strerror (errno
));
949 if (mtd_type
!= MTD_ABSENT
)
950 ioctl(fd
, MEMLOCK
, &erase
);
952 processed
+= erasesize
;
954 blockstart
+= erasesize
;
957 if (write_total
> count
)
964 * Set obsolete flag at offset - NOR flash only
966 static int flash_flag_obsolete (int dev
, int fd
, off_t offset
)
969 struct erase_info_user erase
;
971 erase
.start
= DEVOFFSET (dev
);
972 erase
.length
= DEVESIZE (dev
);
973 /* This relies on the fact, that obsolete_flag == 0 */
974 rc
= lseek (fd
, offset
, SEEK_SET
);
976 fprintf (stderr
, "Cannot seek to set the flag on %s \n",
980 ioctl (fd
, MEMUNLOCK
, &erase
);
981 rc
= write (fd
, &obsolete_flag
, sizeof (obsolete_flag
));
982 ioctl (fd
, MEMLOCK
, &erase
);
984 perror ("Could not set obsolete flag");
989 /* Encrypt or decrypt the environment before writing or reading it. */
990 static int env_aes_cbc_crypt(char *payload
, const int enc
)
992 uint8_t *data
= (uint8_t *)payload
;
993 const int len
= getenvsize();
994 uint8_t key_exp
[AES_EXPAND_KEY_LENGTH
];
997 /* First we expand the key. */
998 aes_expand_key(aes_key
, key_exp
);
1000 /* Calculate the number of AES blocks to encrypt. */
1001 aes_blocks
= DIV_ROUND_UP(len
, AES_KEY_LENGTH
);
1004 aes_cbc_encrypt_blocks(key_exp
, data
, data
, aes_blocks
);
1006 aes_cbc_decrypt_blocks(key_exp
, data
, data
, aes_blocks
);
1011 static int flash_write (int fd_current
, int fd_target
, int dev_target
)
1015 switch (environment
.flag_scheme
) {
1018 case FLAG_INCREMENTAL
:
1019 (*environment
.flags
)++;
1022 *environment
.flags
= active_flag
;
1025 fprintf (stderr
, "Unimplemented flash scheme %u \n",
1026 environment
.flag_scheme
);
1031 fprintf(stderr
, "Writing new environment at 0x%lx on %s\n",
1032 DEVOFFSET (dev_target
), DEVNAME (dev_target
));
1035 rc
= flash_write_buf(dev_target
, fd_target
, environment
.image
,
1036 CUR_ENVSIZE
, DEVOFFSET(dev_target
),
1037 DEVTYPE(dev_target
));
1041 if (environment
.flag_scheme
== FLAG_BOOLEAN
) {
1042 /* Have to set obsolete flag */
1043 off_t offset
= DEVOFFSET (dev_current
) +
1044 offsetof (struct env_image_redundant
, flags
);
1047 "Setting obsolete flag in environment at 0x%lx on %s\n",
1048 DEVOFFSET (dev_current
), DEVNAME (dev_current
));
1050 flash_flag_obsolete (dev_current
, fd_current
, offset
);
1056 static int flash_read (int fd
)
1058 struct mtd_info_user mtdinfo
;
1062 rc
= fstat(fd
, &st
);
1064 fprintf(stderr
, "Cannot stat the file %s\n",
1065 DEVNAME(dev_current
));
1069 if (S_ISCHR(st
.st_mode
)) {
1070 rc
= ioctl(fd
, MEMGETINFO
, &mtdinfo
);
1072 fprintf(stderr
, "Cannot get MTD information for %s\n",
1073 DEVNAME(dev_current
));
1076 if (mtdinfo
.type
!= MTD_NORFLASH
&&
1077 mtdinfo
.type
!= MTD_NANDFLASH
&&
1078 mtdinfo
.type
!= MTD_DATAFLASH
&&
1079 mtdinfo
.type
!= MTD_UBIVOLUME
) {
1080 fprintf (stderr
, "Unsupported flash type %u on %s\n",
1081 mtdinfo
.type
, DEVNAME(dev_current
));
1085 memset(&mtdinfo
, 0, sizeof(mtdinfo
));
1086 mtdinfo
.type
= MTD_ABSENT
;
1089 DEVTYPE(dev_current
) = mtdinfo
.type
;
1091 rc
= flash_read_buf(dev_current
, fd
, environment
.image
, CUR_ENVSIZE
,
1092 DEVOFFSET (dev_current
), mtdinfo
.type
);
1093 if (rc
!= CUR_ENVSIZE
)
1099 static int flash_io (int mode
)
1101 int fd_current
, fd_target
, rc
, dev_target
;
1103 /* dev_current: fd_current, erase_current */
1104 fd_current
= open (DEVNAME (dev_current
), mode
);
1105 if (fd_current
< 0) {
1107 "Can't open %s: %s\n",
1108 DEVNAME (dev_current
), strerror (errno
));
1112 if (mode
== O_RDWR
) {
1113 if (HaveRedundEnv
) {
1114 /* switch to next partition for writing */
1115 dev_target
= !dev_current
;
1116 /* dev_target: fd_target, erase_target */
1117 fd_target
= open (DEVNAME (dev_target
), mode
);
1118 if (fd_target
< 0) {
1120 "Can't open %s: %s\n",
1121 DEVNAME (dev_target
),
1127 dev_target
= dev_current
;
1128 fd_target
= fd_current
;
1131 rc
= flash_write (fd_current
, fd_target
, dev_target
);
1133 if (HaveRedundEnv
) {
1134 if (close (fd_target
)) {
1136 "I/O error on %s: %s\n",
1137 DEVNAME (dev_target
),
1143 rc
= flash_read (fd_current
);
1147 if (close (fd_current
)) {
1149 "I/O error on %s: %s\n",
1150 DEVNAME (dev_current
), strerror (errno
));
1158 * s1 is either a simple 'name', or a 'name=value' pair.
1159 * s2 is a 'name=value' pair.
1160 * If the names match, return the value of s2, else NULL.
1163 static char *envmatch (char * s1
, char * s2
)
1165 if (s1
== NULL
|| s2
== NULL
)
1168 while (*s1
== *s2
++)
1171 if (*s1
== '\0' && *(s2
- 1) == '=')
1177 * Prevent confusion if running from erased flash memory
1179 int fw_env_open(void)
1182 unsigned char flag0
;
1186 unsigned char flag1
;
1191 struct env_image_single
*single
;
1192 struct env_image_redundant
*redundant
;
1194 if (parse_config ()) /* should fill envdevices */
1197 addr0
= calloc(1, CUR_ENVSIZE
);
1198 if (addr0
== NULL
) {
1200 "Not enough memory for environment (%ld bytes)\n",
1205 /* read environment from FLASH to local buffer */
1206 environment
.image
= addr0
;
1208 if (HaveRedundEnv
) {
1210 environment
.crc
= &redundant
->crc
;
1211 environment
.flags
= &redundant
->flags
;
1212 environment
.data
= redundant
->data
;
1215 environment
.crc
= &single
->crc
;
1216 environment
.flags
= NULL
;
1217 environment
.data
= single
->data
;
1221 if (flash_io (O_RDONLY
))
1224 crc0
= crc32 (0, (uint8_t *) environment
.data
, ENV_SIZE
);
1227 ret
= env_aes_cbc_crypt(environment
.data
, 0);
1232 crc0_ok
= (crc0
== *environment
.crc
);
1233 if (!HaveRedundEnv
) {
1236 "Warning: Bad CRC, using default environment\n");
1237 memcpy(environment
.data
, default_environment
, sizeof default_environment
);
1240 flag0
= *environment
.flags
;
1243 addr1
= calloc(1, CUR_ENVSIZE
);
1244 if (addr1
== NULL
) {
1246 "Not enough memory for environment (%ld bytes)\n",
1253 * have to set environment.image for flash_read(), careful -
1254 * other pointers in environment still point inside addr0
1256 environment
.image
= addr1
;
1257 if (flash_io (O_RDONLY
))
1260 /* Check flag scheme compatibility */
1261 if (DEVTYPE(dev_current
) == MTD_NORFLASH
&&
1262 DEVTYPE(!dev_current
) == MTD_NORFLASH
) {
1263 environment
.flag_scheme
= FLAG_BOOLEAN
;
1264 } else if (DEVTYPE(dev_current
) == MTD_NANDFLASH
&&
1265 DEVTYPE(!dev_current
) == MTD_NANDFLASH
) {
1266 environment
.flag_scheme
= FLAG_INCREMENTAL
;
1267 } else if (DEVTYPE(dev_current
) == MTD_DATAFLASH
&&
1268 DEVTYPE(!dev_current
) == MTD_DATAFLASH
) {
1269 environment
.flag_scheme
= FLAG_BOOLEAN
;
1270 } else if (DEVTYPE(dev_current
) == MTD_UBIVOLUME
&&
1271 DEVTYPE(!dev_current
) == MTD_UBIVOLUME
) {
1272 environment
.flag_scheme
= FLAG_INCREMENTAL
;
1273 } else if (DEVTYPE(dev_current
) == MTD_ABSENT
&&
1274 DEVTYPE(!dev_current
) == MTD_ABSENT
) {
1275 environment
.flag_scheme
= FLAG_INCREMENTAL
;
1277 fprintf (stderr
, "Incompatible flash types!\n");
1281 crc1
= crc32 (0, (uint8_t *) redundant
->data
, ENV_SIZE
);
1284 ret
= env_aes_cbc_crypt(redundant
->data
, 0);
1289 crc1_ok
= (crc1
== redundant
->crc
);
1290 flag1
= redundant
->flags
;
1292 if (crc0_ok
&& !crc1_ok
) {
1294 } else if (!crc0_ok
&& crc1_ok
) {
1296 } else if (!crc0_ok
&& !crc1_ok
) {
1298 "Warning: Bad CRC, using default environment\n");
1299 memcpy (environment
.data
, default_environment
,
1300 sizeof default_environment
);
1303 switch (environment
.flag_scheme
) {
1305 if (flag0
== active_flag
&&
1306 flag1
== obsolete_flag
) {
1308 } else if (flag0
== obsolete_flag
&&
1309 flag1
== active_flag
) {
1311 } else if (flag0
== flag1
) {
1313 } else if (flag0
== 0xFF) {
1315 } else if (flag1
== 0xFF) {
1321 case FLAG_INCREMENTAL
:
1322 if (flag0
== 255 && flag1
== 0)
1324 else if ((flag1
== 255 && flag0
== 0) ||
1327 else /* flag1 > flag0 */
1331 fprintf (stderr
, "Unknown flag scheme %u \n",
1332 environment
.flag_scheme
);
1338 * If we are reading, we don't need the flag and the CRC any
1339 * more, if we are writing, we will re-calculate CRC and update
1340 * flags before writing out
1343 environment
.image
= addr1
;
1344 environment
.crc
= &redundant
->crc
;
1345 environment
.flags
= &redundant
->flags
;
1346 environment
.data
= redundant
->data
;
1349 environment
.image
= addr0
;
1350 /* Other pointers are already set */
1354 fprintf(stderr
, "Selected env in %s\n", DEVNAME(dev_current
));
1361 static int parse_config ()
1365 #if defined(CONFIG_FILE)
1366 /* Fills in DEVNAME(), ENVSIZE(), DEVESIZE(). Or don't. */
1367 if (get_config (CONFIG_FILE
)) {
1369 "Cannot parse config file: %s\n", strerror (errno
));
1373 DEVNAME (0) = DEVICE1_NAME
;
1374 DEVOFFSET (0) = DEVICE1_OFFSET
;
1375 ENVSIZE (0) = ENV1_SIZE
;
1376 /* Default values are: erase-size=env-size */
1377 DEVESIZE (0) = ENVSIZE (0);
1378 /* #sectors=env-size/erase-size (rounded up) */
1379 ENVSECTORS (0) = (ENVSIZE(0) + DEVESIZE(0) - 1) / DEVESIZE(0);
1380 #ifdef DEVICE1_ESIZE
1381 DEVESIZE (0) = DEVICE1_ESIZE
;
1383 #ifdef DEVICE1_ENVSECTORS
1384 ENVSECTORS (0) = DEVICE1_ENVSECTORS
;
1388 DEVNAME (1) = DEVICE2_NAME
;
1389 DEVOFFSET (1) = DEVICE2_OFFSET
;
1390 ENVSIZE (1) = ENV2_SIZE
;
1391 /* Default values are: erase-size=env-size */
1392 DEVESIZE (1) = ENVSIZE (1);
1393 /* #sectors=env-size/erase-size (rounded up) */
1394 ENVSECTORS (1) = (ENVSIZE(1) + DEVESIZE(1) - 1) / DEVESIZE(1);
1395 #ifdef DEVICE2_ESIZE
1396 DEVESIZE (1) = DEVICE2_ESIZE
;
1398 #ifdef DEVICE2_ENVSECTORS
1399 ENVSECTORS (1) = DEVICE2_ENVSECTORS
;
1404 if (stat (DEVNAME (0), &st
)) {
1406 "Cannot access MTD device %s: %s\n",
1407 DEVNAME (0), strerror (errno
));
1411 if (HaveRedundEnv
&& stat (DEVNAME (1), &st
)) {
1413 "Cannot access MTD device %s: %s\n",
1414 DEVNAME (1), strerror (errno
));
1420 #if defined(CONFIG_FILE)
1421 static int get_config (char *fname
)
1429 fp
= fopen (fname
, "r");
1433 while (i
< 2 && fgets (dump
, sizeof (dump
), fp
)) {
1434 /* Skip incomplete conversions and comment strings */
1438 rc
= sscanf (dump
, "%ms %lx %lx %lx %lx",
1448 DEVNAME(i
) = devname
;
1451 /* Assume the erase size is the same as the env-size */
1452 DEVESIZE(i
) = ENVSIZE(i
);
1455 /* Assume enough env sectors to cover the environment */
1456 ENVSECTORS (i
) = (ENVSIZE(i
) + DEVESIZE(i
) - 1) / DEVESIZE(i
);
1462 HaveRedundEnv
= i
- 1;
1463 if (!i
) { /* No valid entries found */