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>
34 #define WHITESPACE(c) ((c == '\t') || (c == ' '))
36 #define min(x, y) ({ \
37 typeof(x) _min1 = (x); \
38 typeof(y) _min2 = (y); \
39 (void) (&_min1 == &_min2); \
40 _min1 < _min2 ? _min1 : _min2; })
43 char devname
[16]; /* Device name */
44 ulong devoff
; /* Device offset */
45 ulong env_size
; /* environment size */
46 ulong erase_size
; /* device erase size */
47 ulong env_sectors
; /* number of environment sectors */
48 uint8_t mtd_type
; /* type of the MTD device */
51 static struct envdev_s envdevices
[2] =
54 .mtd_type
= MTD_ABSENT
,
56 .mtd_type
= MTD_ABSENT
,
59 static int dev_current
;
61 #define DEVNAME(i) envdevices[(i)].devname
62 #define DEVOFFSET(i) envdevices[(i)].devoff
63 #define ENVSIZE(i) envdevices[(i)].env_size
64 #define DEVESIZE(i) envdevices[(i)].erase_size
65 #define ENVSECTORS(i) envdevices[(i)].env_sectors
66 #define DEVTYPE(i) envdevices[(i)].mtd_type
68 #define CUR_ENVSIZE ENVSIZE(dev_current)
70 #define ENV_SIZE getenvsize()
72 struct env_image_single
{
73 uint32_t crc
; /* CRC32 over data bytes */
77 struct env_image_redundant
{
78 uint32_t crc
; /* CRC32 over data bytes */
79 unsigned char flags
; /* active or obsolete */
94 enum flag_scheme flag_scheme
;
97 static struct environment environment
= {
98 .flag_scheme
= FLAG_NONE
,
101 static int HaveRedundEnv
= 0;
103 static unsigned char active_flag
= 1;
104 /* obsolete_flag must be 0 to efficiently set it on NOR flash without erasing */
105 static unsigned char obsolete_flag
= 0;
107 #define DEFAULT_ENV_INSTANCE_STATIC
108 #include <env_default.h>
110 static int flash_io (int mode
);
111 static char *envmatch (char * s1
, char * s2
);
112 static int parse_config (void);
114 #if defined(CONFIG_FILE)
115 static int get_config (char *);
117 static inline ulong
getenvsize (void)
119 ulong rc
= CUR_ENVSIZE
- sizeof(long);
126 static char *fw_string_blank(char *s
, int noblank
)
131 for (i
= 0; i
< len
; i
++, s
++) {
132 if ((noblank
&& !WHITESPACE(*s
)) ||
133 (!noblank
&& WHITESPACE(*s
)))
143 * Search the environment for a variable.
144 * Return the value, if found, or NULL, if not found.
146 char *fw_getenv (char *name
)
150 for (env
= environment
.data
; *env
; env
= nxt
+ 1) {
153 for (nxt
= env
; *nxt
; ++nxt
) {
154 if (nxt
>= &environment
.data
[ENV_SIZE
]) {
155 fprintf (stderr
, "## Error: "
156 "environment not terminated\n");
160 val
= envmatch (name
, env
);
169 * Search the default environment for a variable.
170 * Return the value, if found, or NULL, if not found.
172 char *fw_getdefenv(char *name
)
176 for (env
= default_environment
; *env
; env
= nxt
+ 1) {
179 for (nxt
= env
; *nxt
; ++nxt
) {
180 if (nxt
>= &default_environment
[ENV_SIZE
]) {
181 fprintf(stderr
, "## Error: "
182 "default environment not terminated\n");
186 val
= envmatch(name
, env
);
195 * Print the current definition of one, or more, or all
196 * environment variables
198 int fw_printenv (int argc
, char *argv
[])
207 if (argc
== 1) { /* Print all env variables */
208 for (env
= environment
.data
; *env
; env
= nxt
+ 1) {
209 for (nxt
= env
; *nxt
; ++nxt
) {
210 if (nxt
>= &environment
.data
[ENV_SIZE
]) {
211 fprintf (stderr
, "## Error: "
212 "environment not terminated\n");
217 printf ("%s\n", env
);
222 if (strcmp (argv
[1], "-n") == 0) {
227 fprintf (stderr
, "## Error: "
228 "`-n' option requires exactly one argument\n");
235 for (i
= 1; i
< argc
; ++i
) { /* print single env variables */
236 char *name
= argv
[i
];
239 for (env
= environment
.data
; *env
; env
= nxt
+ 1) {
241 for (nxt
= env
; *nxt
; ++nxt
) {
242 if (nxt
>= &environment
.data
[ENV_SIZE
]) {
243 fprintf (stderr
, "## Error: "
244 "environment not terminated\n");
248 val
= envmatch (name
, env
);
251 fputs (name
, stdout
);
259 fprintf (stderr
, "## Error: \"%s\" not defined\n", name
);
267 int fw_env_close(void)
272 *environment
.crc
= crc32(0, (uint8_t *) environment
.data
, ENV_SIZE
);
274 /* write environment back to flash */
275 if (flash_io(O_RDWR
)) {
277 "Error: can't write fw_env to flash\n");
286 * Set/Clear a single variable in the environment.
287 * This is called in sequence to update the environment
288 * in RAM without updating the copy in flash after each set
290 int fw_env_write(char *name
, char *value
)
295 int deleting
, creating
, overwriting
;
298 * search if variable with this name already exists
300 for (nxt
= env
= environment
.data
; *env
; env
= nxt
+ 1) {
301 for (nxt
= env
; *nxt
; ++nxt
) {
302 if (nxt
>= &environment
.data
[ENV_SIZE
]) {
303 fprintf(stderr
, "## Error: "
304 "environment not terminated\n");
309 if ((oldval
= envmatch (name
, env
)) != NULL
)
313 deleting
= (oldval
&& !(value
&& strlen(value
)));
314 creating
= (!oldval
&& (value
&& strlen(value
)));
315 overwriting
= (oldval
&& (value
&& strlen(value
)));
317 /* check for permission */
319 if (env_flags_validate_varaccess(name
,
320 ENV_FLAGS_VARACCESS_PREVENT_DELETE
)) {
321 printf("Can't delete \"%s\"\n", name
);
325 } else if (overwriting
) {
326 if (env_flags_validate_varaccess(name
,
327 ENV_FLAGS_VARACCESS_PREVENT_OVERWR
)) {
328 printf("Can't overwrite \"%s\"\n", name
);
331 } else if (env_flags_validate_varaccess(name
,
332 ENV_FLAGS_VARACCESS_PREVENT_NONDEF_OVERWR
)) {
333 const char *defval
= fw_getdefenv(name
);
337 if (strcmp(oldval
, defval
)
339 printf("Can't overwrite \"%s\"\n", name
);
344 } else if (creating
) {
345 if (env_flags_validate_varaccess(name
,
346 ENV_FLAGS_VARACCESS_PREVENT_CREATE
)) {
347 printf("Can't create \"%s\"\n", name
);
355 if (deleting
|| overwriting
) {
356 if (*++nxt
== '\0') {
361 if ((*env
== '\0') && (*nxt
== '\0'))
370 if (!value
|| !strlen(value
))
374 * Append new definition at the end
376 for (env
= environment
.data
; *env
|| *(env
+ 1); ++env
);
377 if (env
> environment
.data
)
381 * "name" + "=" + "val" +"\0\0" > CUR_ENVSIZE - (env-environment)
383 len
= strlen (name
) + 2;
384 /* add '=' for first arg, ' ' for all others */
385 len
+= strlen(value
) + 1;
387 if (len
> (&environment
.data
[ENV_SIZE
] - env
)) {
389 "Error: environment overflow, \"%s\" deleted\n",
394 while ((*env
= *name
++) != '\0')
397 while ((*++env
= *value
++) != '\0')
400 /* end is marked with double '\0' */
407 * Deletes or sets environment variables. Returns -1 and sets errno error codes:
409 * EINVAL - need at least 1 argument
410 * EROFS - certain variables ("ethaddr", "serial#") cannot be
411 * modified or deleted
414 int fw_setenv(int argc
, char *argv
[])
427 fprintf(stderr
, "Error: environment not initialized\n");
433 if (env_flags_validate_env_set_params(argc
, argv
) < 0)
437 for (i
= 2; i
< argc
; ++i
) {
439 size_t val_len
= strlen(val
);
442 value
[len
- 1] = ' ';
443 value
= realloc(value
, len
+ val_len
+ 1);
446 "Cannot malloc %zu bytes: %s\n",
447 len
, strerror(errno
));
451 memcpy(value
+ len
, val
, val_len
);
456 fw_env_write(name
, value
);
460 return fw_env_close();
464 * Parse a file and configure the u-boot variables.
465 * The script file has a very simple format, as follows:
467 * Each line has a couple with name, value:
468 * <white spaces>variable_name<white spaces>variable_value
470 * Both variable_name and variable_value are interpreted as strings.
471 * Any character after <white spaces> and before ending \r\n is interpreted
472 * as variable's value (no comment allowed on these lines !)
474 * Comments are allowed if the first character in the line is #
476 * Returns -1 and sets errno error codes:
480 int fw_parse_script(char *fname
)
483 char dump
[1024]; /* Maximum line length in the file */
491 fprintf(stderr
, "Error: environment not initialized\n");
495 if (strcmp(fname
, "-") == 0)
498 fp
= fopen(fname
, "r");
500 fprintf(stderr
, "I cannot open %s for reading\n",
506 while (fgets(dump
, sizeof(dump
), fp
)) {
511 * Read a whole line from the file. If the line is too long
512 * or is not terminated, reports an error and exit.
514 if (dump
[len
- 1] != '\n') {
516 "Line %d not corrected terminated or too long\n",
522 /* Drop ending line feed / carriage return */
523 while (len
> 0 && (dump
[len
- 1] == '\n' ||
524 dump
[len
- 1] == '\r')) {
525 dump
[len
- 1] = '\0';
529 /* Skip comment or empty lines */
530 if ((len
== 0) || dump
[0] == '#')
534 * Search for variable's name,
535 * remove leading whitespaces
537 name
= fw_string_blank(dump
, 1);
541 /* The first white space is the end of variable name */
542 val
= fw_string_blank(name
, 0);
546 if ((val
- name
) < len
)
547 val
= fw_string_blank(val
, 1);
553 fprintf(stderr
, "Setting %s : %s\n",
554 name
, val
? val
: " removed");
557 if (env_flags_validate_type(name
, val
) < 0) {
563 * If there is an error setting a variable,
564 * try to save the environment and returns an error
566 if (fw_env_write(name
, val
)) {
568 "fw_env_write returns with error : %s\n",
576 /* Close file if not stdin */
577 if (strcmp(fname
, "-") != 0)
580 ret
|= fw_env_close();
587 * Test for bad block on NAND, just returns 0 on NOR, on NAND:
590 * < 0 - failed to test
592 static int flash_bad_block (int fd
, uint8_t mtd_type
, loff_t
*blockstart
)
594 if (mtd_type
== MTD_NANDFLASH
) {
595 int badblock
= ioctl (fd
, MEMGETBADBLOCK
, blockstart
);
598 perror ("Cannot read bad block mark");
604 fprintf (stderr
, "Bad block at 0x%llx, "
605 "skipping\n", *blockstart
);
615 * Read data from flash at an offset into a provided buffer. On NAND it skips
616 * bad blocks but makes sure it stays within ENVSECTORS (dev) starting from
617 * the DEVOFFSET (dev) block. On NOR the loop is only run once.
619 static int flash_read_buf (int dev
, int fd
, void *buf
, size_t count
,
620 off_t offset
, uint8_t mtd_type
)
622 size_t blocklen
; /* erase / write length - one block on NAND,
624 size_t processed
= 0; /* progress counter */
625 size_t readlen
= count
; /* current read length */
626 off_t top_of_range
; /* end of the last block we may use */
627 off_t block_seek
; /* offset inside the current block to the start
629 loff_t blockstart
; /* running start of the current block -
630 MEMGETBADBLOCK needs 64 bits */
633 blockstart
= (offset
/ DEVESIZE (dev
)) * DEVESIZE (dev
);
635 /* Offset inside a block */
636 block_seek
= offset
- blockstart
;
638 if (mtd_type
== MTD_NANDFLASH
) {
640 * NAND: calculate which blocks we are reading. We have
641 * to read one block at a time to skip bad blocks.
643 blocklen
= DEVESIZE (dev
);
646 * To calculate the top of the range, we have to use the
647 * global DEVOFFSET (dev), which can be different from offset
649 top_of_range
= ((DEVOFFSET(dev
) / blocklen
) +
650 ENVSECTORS (dev
)) * blocklen
;
652 /* Limit to one block for the first read */
653 if (readlen
> blocklen
- block_seek
)
654 readlen
= blocklen
- block_seek
;
657 top_of_range
= offset
+ count
;
660 /* This only runs once on NOR flash */
661 while (processed
< count
) {
662 rc
= flash_bad_block (fd
, mtd_type
, &blockstart
);
663 if (rc
< 0) /* block test failed */
666 if (blockstart
+ block_seek
+ readlen
> top_of_range
) {
667 /* End of range is reached */
669 "Too few good blocks within range\n");
673 if (rc
) { /* block is bad */
674 blockstart
+= blocklen
;
679 * If a block is bad, we retry in the next block at the same
680 * offset - see common/env_nand.c::writeenv()
682 lseek (fd
, blockstart
+ block_seek
, SEEK_SET
);
684 rc
= read (fd
, buf
+ processed
, readlen
);
686 fprintf (stderr
, "Read error on %s: %s\n",
687 DEVNAME (dev
), strerror (errno
));
691 fprintf(stderr
, "Read 0x%x bytes at 0x%llx on %s\n",
692 rc
, blockstart
+ block_seek
, DEVNAME(dev
));
694 processed
+= readlen
;
695 readlen
= min (blocklen
, count
- processed
);
697 blockstart
+= blocklen
;
704 * Write count bytes at offset, but stay within ENVSECTORS (dev) sectors of
705 * DEVOFFSET (dev). Similar to the read case above, on NOR and dataflash we
706 * erase and write the whole data at once.
708 static int flash_write_buf (int dev
, int fd
, void *buf
, size_t count
,
709 off_t offset
, uint8_t mtd_type
)
712 struct erase_info_user erase
;
713 size_t blocklen
; /* length of NAND block / NOR erase sector */
714 size_t erase_len
; /* whole area that can be erased - may include
716 size_t erasesize
; /* erase / write length - one block on NAND,
718 size_t processed
= 0; /* progress counter */
719 size_t write_total
; /* total size to actually write - excluding
721 off_t erase_offset
; /* offset to the first erase block (aligned)
723 off_t block_seek
; /* offset inside the erase block to the start
725 off_t top_of_range
; /* end of the last block we may use */
726 loff_t blockstart
; /* running start of the current block -
727 MEMGETBADBLOCK needs 64 bits */
731 * For mtd devices only offset and size of the environment do matter
733 if (mtd_type
== MTD_ABSENT
) {
735 top_of_range
= offset
+ count
;
736 erase_len
= blocklen
;
739 write_total
= blocklen
;
741 blocklen
= DEVESIZE(dev
);
743 top_of_range
= ((DEVOFFSET(dev
) / blocklen
) +
744 ENVSECTORS(dev
)) * blocklen
;
746 erase_offset
= (offset
/ blocklen
) * blocklen
;
748 /* Maximum area we may use */
749 erase_len
= top_of_range
- erase_offset
;
751 blockstart
= erase_offset
;
752 /* Offset inside a block */
753 block_seek
= offset
- erase_offset
;
756 * Data size we actually write: from the start of the block
757 * to the start of the data, then count bytes of data, and
758 * to the end of the block
760 write_total
= ((block_seek
+ count
+ blocklen
- 1) /
761 blocklen
) * blocklen
;
765 * Support data anywhere within erase sectors: read out the complete
766 * area to be erased, replace the environment image, write the whole
769 if (write_total
> count
) {
770 data
= malloc (erase_len
);
773 "Cannot malloc %zu bytes: %s\n",
774 erase_len
, strerror (errno
));
778 rc
= flash_read_buf (dev
, fd
, data
, write_total
, erase_offset
,
780 if (write_total
!= rc
)
784 fprintf(stderr
, "Preserving data ");
786 fprintf(stderr
, "0x%x - 0x%lx", 0, block_seek
- 1);
787 if (block_seek
+ count
!= write_total
) {
789 fprintf(stderr
, " and ");
790 fprintf(stderr
, "0x%lx - 0x%x",
791 block_seek
+ count
, write_total
- 1);
793 fprintf(stderr
, "\n");
795 /* Overwrite the old environment */
796 memcpy (data
+ block_seek
, buf
, count
);
799 * We get here, iff offset is block-aligned and count is a
800 * multiple of blocklen - see write_total calculation above
805 if (mtd_type
== MTD_NANDFLASH
) {
807 * NAND: calculate which blocks we are writing. We have
808 * to write one block at a time to skip bad blocks.
810 erasesize
= blocklen
;
812 erasesize
= erase_len
;
815 erase
.length
= erasesize
;
817 /* This only runs once on NOR flash and SPI-dataflash */
818 while (processed
< write_total
) {
819 rc
= flash_bad_block (fd
, mtd_type
, &blockstart
);
820 if (rc
< 0) /* block test failed */
823 if (blockstart
+ erasesize
> top_of_range
) {
824 fprintf (stderr
, "End of range reached, aborting\n");
828 if (rc
) { /* block is bad */
829 blockstart
+= blocklen
;
833 if (mtd_type
!= MTD_ABSENT
) {
834 erase
.start
= blockstart
;
835 ioctl(fd
, MEMUNLOCK
, &erase
);
836 /* These do not need an explicit erase cycle */
837 if (mtd_type
!= MTD_DATAFLASH
)
838 if (ioctl(fd
, MEMERASE
, &erase
) != 0) {
840 "MTD erase error on %s: %s\n",
841 DEVNAME(dev
), strerror(errno
));
846 if (lseek (fd
, blockstart
, SEEK_SET
) == -1) {
848 "Seek error on %s: %s\n",
849 DEVNAME (dev
), strerror (errno
));
854 fprintf(stderr
, "Write 0x%x bytes at 0x%llx\n", erasesize
,
857 if (write (fd
, data
+ processed
, erasesize
) != erasesize
) {
858 fprintf (stderr
, "Write error on %s: %s\n",
859 DEVNAME (dev
), strerror (errno
));
863 if (mtd_type
!= MTD_ABSENT
)
864 ioctl(fd
, MEMLOCK
, &erase
);
866 processed
+= blocklen
;
868 blockstart
+= blocklen
;
871 if (write_total
> count
)
878 * Set obsolete flag at offset - NOR flash only
880 static int flash_flag_obsolete (int dev
, int fd
, off_t offset
)
883 struct erase_info_user erase
;
885 erase
.start
= DEVOFFSET (dev
);
886 erase
.length
= DEVESIZE (dev
);
887 /* This relies on the fact, that obsolete_flag == 0 */
888 rc
= lseek (fd
, offset
, SEEK_SET
);
890 fprintf (stderr
, "Cannot seek to set the flag on %s \n",
894 ioctl (fd
, MEMUNLOCK
, &erase
);
895 rc
= write (fd
, &obsolete_flag
, sizeof (obsolete_flag
));
896 ioctl (fd
, MEMLOCK
, &erase
);
898 perror ("Could not set obsolete flag");
903 static int flash_write (int fd_current
, int fd_target
, int dev_target
)
907 switch (environment
.flag_scheme
) {
910 case FLAG_INCREMENTAL
:
911 (*environment
.flags
)++;
914 *environment
.flags
= active_flag
;
917 fprintf (stderr
, "Unimplemented flash scheme %u \n",
918 environment
.flag_scheme
);
923 fprintf(stderr
, "Writing new environment at 0x%lx on %s\n",
924 DEVOFFSET (dev_target
), DEVNAME (dev_target
));
926 rc
= flash_write_buf(dev_target
, fd_target
, environment
.image
,
927 CUR_ENVSIZE
, DEVOFFSET(dev_target
),
928 DEVTYPE(dev_target
));
932 if (environment
.flag_scheme
== FLAG_BOOLEAN
) {
933 /* Have to set obsolete flag */
934 off_t offset
= DEVOFFSET (dev_current
) +
935 offsetof (struct env_image_redundant
, flags
);
938 "Setting obsolete flag in environment at 0x%lx on %s\n",
939 DEVOFFSET (dev_current
), DEVNAME (dev_current
));
941 flash_flag_obsolete (dev_current
, fd_current
, offset
);
947 static int flash_read (int fd
)
949 struct mtd_info_user mtdinfo
;
955 fprintf(stderr
, "Cannot stat the file %s\n",
956 DEVNAME(dev_current
));
960 if (S_ISCHR(st
.st_mode
)) {
961 rc
= ioctl(fd
, MEMGETINFO
, &mtdinfo
);
963 fprintf(stderr
, "Cannot get MTD information for %s\n",
964 DEVNAME(dev_current
));
967 if (mtdinfo
.type
!= MTD_NORFLASH
&&
968 mtdinfo
.type
!= MTD_NANDFLASH
&&
969 mtdinfo
.type
!= MTD_DATAFLASH
&&
970 mtdinfo
.type
!= MTD_UBIVOLUME
) {
971 fprintf (stderr
, "Unsupported flash type %u on %s\n",
972 mtdinfo
.type
, DEVNAME(dev_current
));
976 memset(&mtdinfo
, 0, sizeof(mtdinfo
));
977 mtdinfo
.type
= MTD_ABSENT
;
980 DEVTYPE(dev_current
) = mtdinfo
.type
;
982 rc
= flash_read_buf(dev_current
, fd
, environment
.image
, CUR_ENVSIZE
,
983 DEVOFFSET (dev_current
), mtdinfo
.type
);
985 return (rc
!= CUR_ENVSIZE
) ? -1 : 0;
988 static int flash_io (int mode
)
990 int fd_current
, fd_target
, rc
, dev_target
;
992 /* dev_current: fd_current, erase_current */
993 fd_current
= open (DEVNAME (dev_current
), mode
);
994 if (fd_current
< 0) {
996 "Can't open %s: %s\n",
997 DEVNAME (dev_current
), strerror (errno
));
1001 if (mode
== O_RDWR
) {
1002 if (HaveRedundEnv
) {
1003 /* switch to next partition for writing */
1004 dev_target
= !dev_current
;
1005 /* dev_target: fd_target, erase_target */
1006 fd_target
= open (DEVNAME (dev_target
), mode
);
1007 if (fd_target
< 0) {
1009 "Can't open %s: %s\n",
1010 DEVNAME (dev_target
),
1016 dev_target
= dev_current
;
1017 fd_target
= fd_current
;
1020 rc
= flash_write (fd_current
, fd_target
, dev_target
);
1022 if (HaveRedundEnv
) {
1023 if (close (fd_target
)) {
1025 "I/O error on %s: %s\n",
1026 DEVNAME (dev_target
),
1032 rc
= flash_read (fd_current
);
1036 if (close (fd_current
)) {
1038 "I/O error on %s: %s\n",
1039 DEVNAME (dev_current
), strerror (errno
));
1047 * s1 is either a simple 'name', or a 'name=value' pair.
1048 * s2 is a 'name=value' pair.
1049 * If the names match, return the value of s2, else NULL.
1052 static char *envmatch (char * s1
, char * s2
)
1054 if (s1
== NULL
|| s2
== NULL
)
1057 while (*s1
== *s2
++)
1060 if (*s1
== '\0' && *(s2
- 1) == '=')
1066 * Prevent confusion if running from erased flash memory
1068 int fw_env_open(void)
1071 unsigned char flag0
;
1075 unsigned char flag1
;
1078 struct env_image_single
*single
;
1079 struct env_image_redundant
*redundant
;
1081 if (parse_config ()) /* should fill envdevices */
1084 addr0
= calloc(1, CUR_ENVSIZE
);
1085 if (addr0
== NULL
) {
1087 "Not enough memory for environment (%ld bytes)\n",
1092 /* read environment from FLASH to local buffer */
1093 environment
.image
= addr0
;
1095 if (HaveRedundEnv
) {
1097 environment
.crc
= &redundant
->crc
;
1098 environment
.flags
= &redundant
->flags
;
1099 environment
.data
= redundant
->data
;
1102 environment
.crc
= &single
->crc
;
1103 environment
.flags
= NULL
;
1104 environment
.data
= single
->data
;
1108 if (flash_io (O_RDONLY
))
1111 crc0
= crc32 (0, (uint8_t *) environment
.data
, ENV_SIZE
);
1112 crc0_ok
= (crc0
== *environment
.crc
);
1113 if (!HaveRedundEnv
) {
1116 "Warning: Bad CRC, using default environment\n");
1117 memcpy(environment
.data
, default_environment
, sizeof default_environment
);
1120 flag0
= *environment
.flags
;
1123 addr1
= calloc(1, CUR_ENVSIZE
);
1124 if (addr1
== NULL
) {
1126 "Not enough memory for environment (%ld bytes)\n",
1133 * have to set environment.image for flash_read(), careful -
1134 * other pointers in environment still point inside addr0
1136 environment
.image
= addr1
;
1137 if (flash_io (O_RDONLY
))
1140 /* Check flag scheme compatibility */
1141 if (DEVTYPE(dev_current
) == MTD_NORFLASH
&&
1142 DEVTYPE(!dev_current
) == MTD_NORFLASH
) {
1143 environment
.flag_scheme
= FLAG_BOOLEAN
;
1144 } else if (DEVTYPE(dev_current
) == MTD_NANDFLASH
&&
1145 DEVTYPE(!dev_current
) == MTD_NANDFLASH
) {
1146 environment
.flag_scheme
= FLAG_INCREMENTAL
;
1147 } else if (DEVTYPE(dev_current
) == MTD_DATAFLASH
&&
1148 DEVTYPE(!dev_current
) == MTD_DATAFLASH
) {
1149 environment
.flag_scheme
= FLAG_BOOLEAN
;
1150 } else if (DEVTYPE(dev_current
) == MTD_UBIVOLUME
&&
1151 DEVTYPE(!dev_current
) == MTD_UBIVOLUME
) {
1152 environment
.flag_scheme
= FLAG_INCREMENTAL
;
1153 } else if (DEVTYPE(dev_current
) == MTD_ABSENT
&&
1154 DEVTYPE(!dev_current
) == MTD_ABSENT
) {
1155 environment
.flag_scheme
= FLAG_INCREMENTAL
;
1157 fprintf (stderr
, "Incompatible flash types!\n");
1161 crc1
= crc32 (0, (uint8_t *) redundant
->data
, ENV_SIZE
);
1162 crc1_ok
= (crc1
== redundant
->crc
);
1163 flag1
= redundant
->flags
;
1165 if (crc0_ok
&& !crc1_ok
) {
1167 } else if (!crc0_ok
&& crc1_ok
) {
1169 } else if (!crc0_ok
&& !crc1_ok
) {
1171 "Warning: Bad CRC, using default environment\n");
1172 memcpy (environment
.data
, default_environment
,
1173 sizeof default_environment
);
1176 switch (environment
.flag_scheme
) {
1178 if (flag0
== active_flag
&&
1179 flag1
== obsolete_flag
) {
1181 } else if (flag0
== obsolete_flag
&&
1182 flag1
== active_flag
) {
1184 } else if (flag0
== flag1
) {
1186 } else if (flag0
== 0xFF) {
1188 } else if (flag1
== 0xFF) {
1194 case FLAG_INCREMENTAL
:
1195 if (flag0
== 255 && flag1
== 0)
1197 else if ((flag1
== 255 && flag0
== 0) ||
1200 else /* flag1 > flag0 */
1204 fprintf (stderr
, "Unknown flag scheme %u \n",
1205 environment
.flag_scheme
);
1211 * If we are reading, we don't need the flag and the CRC any
1212 * more, if we are writing, we will re-calculate CRC and update
1213 * flags before writing out
1216 environment
.image
= addr1
;
1217 environment
.crc
= &redundant
->crc
;
1218 environment
.flags
= &redundant
->flags
;
1219 environment
.data
= redundant
->data
;
1222 environment
.image
= addr0
;
1223 /* Other pointers are already set */
1227 fprintf(stderr
, "Selected env in %s\n", DEVNAME(dev_current
));
1234 static int parse_config ()
1238 #if defined(CONFIG_FILE)
1239 /* Fills in DEVNAME(), ENVSIZE(), DEVESIZE(). Or don't. */
1240 if (get_config (CONFIG_FILE
)) {
1242 "Cannot parse config file: %s\n", strerror (errno
));
1246 strcpy (DEVNAME (0), DEVICE1_NAME
);
1247 DEVOFFSET (0) = DEVICE1_OFFSET
;
1248 ENVSIZE (0) = ENV1_SIZE
;
1249 /* Default values are: erase-size=env-size */
1250 DEVESIZE (0) = ENVSIZE (0);
1251 /* #sectors=env-size/erase-size (rounded up) */
1252 ENVSECTORS (0) = (ENVSIZE(0) + DEVESIZE(0) - 1) / DEVESIZE(0);
1253 #ifdef DEVICE1_ESIZE
1254 DEVESIZE (0) = DEVICE1_ESIZE
;
1256 #ifdef DEVICE1_ENVSECTORS
1257 ENVSECTORS (0) = DEVICE1_ENVSECTORS
;
1261 strcpy (DEVNAME (1), DEVICE2_NAME
);
1262 DEVOFFSET (1) = DEVICE2_OFFSET
;
1263 ENVSIZE (1) = ENV2_SIZE
;
1264 /* Default values are: erase-size=env-size */
1265 DEVESIZE (1) = ENVSIZE (1);
1266 /* #sectors=env-size/erase-size (rounded up) */
1267 ENVSECTORS (1) = (ENVSIZE(1) + DEVESIZE(1) - 1) / DEVESIZE(1);
1268 #ifdef DEVICE2_ESIZE
1269 DEVESIZE (1) = DEVICE2_ESIZE
;
1271 #ifdef DEVICE2_ENVSECTORS
1272 ENVSECTORS (1) = DEVICE2_ENVSECTORS
;
1277 if (stat (DEVNAME (0), &st
)) {
1279 "Cannot access MTD device %s: %s\n",
1280 DEVNAME (0), strerror (errno
));
1284 if (HaveRedundEnv
&& stat (DEVNAME (1), &st
)) {
1286 "Cannot access MTD device %s: %s\n",
1287 DEVNAME (1), strerror (errno
));
1293 #if defined(CONFIG_FILE)
1294 static int get_config (char *fname
)
1301 fp
= fopen (fname
, "r");
1305 while (i
< 2 && fgets (dump
, sizeof (dump
), fp
)) {
1306 /* Skip incomplete conversions and comment strings */
1310 rc
= sscanf (dump
, "%s %lx %lx %lx %lx",
1321 /* Assume the erase size is the same as the env-size */
1322 DEVESIZE(i
) = ENVSIZE(i
);
1325 /* Assume enough env sectors to cover the environment */
1326 ENVSECTORS (i
) = (ENVSIZE(i
) + DEVESIZE(i
) - 1) / DEVESIZE(i
);
1332 HaveRedundEnv
= i
- 1;
1333 if (!i
) { /* No valid entries found */