4 * Copyright (C) 2005 Mike Baker
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version 2
9 * of the License, or (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
33 #include <sys/ioctl.h>
34 #include <linux/mtd/mtd.h>
36 #define FILENAME "/dev/mtdblock/1"
39 unsigned magic
; /* "HDR0" */
40 unsigned len
; /* Length of file including header */
41 unsigned crc32
; /* 32-bit CRC from flag_version to end of file */
42 unsigned flag_version
; /* 0:15 flags, 16:31 version */
43 unsigned offsets
[3]; /* Offsets of partitions from start of header */
51 unsigned long poly
= 0xEDB88320L
;
53 if ((crc32
= (unsigned long *) malloc(256 * sizeof(unsigned long))) == (void *)-1) {
57 for (n
= 0; n
< 256; n
++) {
58 crc
= (unsigned long) n
;
59 for (bit
= 0; bit
< 8; bit
++)
60 crc
= (crc
& 1) ? (poly
^ (crc
>> 1)) : (crc
>> 1);
65 unsigned int crc32buf(char *buf
, size_t len
)
67 unsigned int crc
= 0xFFFFFFFF;
68 for (; len
; len
--, buf
++)
69 crc
= crc32
[(crc
^ *buf
) & 0xff] ^ (crc
>> 8);
73 int main(int argc
, char **argv
)
76 struct mtd_info_user mtdInfo
;
78 struct trx_header
*ptr
;
80 if (((fd
= open(FILENAME
, O_RDWR
)) < 0)
81 || ((len
= lseek(fd
, 0, SEEK_END
)) < 0)
82 || ((ptr
= (struct trx_header
*) mmap(0, len
, PROT_READ
|PROT_WRITE
, MAP_SHARED
, fd
, 0)) == (void *) (-1))
83 || (ptr
->magic
!= 0x30524448)) {
84 printf("Error reading trx info\n");
89 if (((fd
= open("/dev/mtd/1", O_RDWR
)) < 0)
90 || (ioctl(fd
, MEMGETINFO
, &mtdInfo
))) {
91 fprintf(stderr
, "Could not get MTD device info from %s\n", FILENAME
);
97 if (argc
> 1 && !strcmp(argv
[1],"--move")) {
98 if (ptr
->offsets
[2] >= ptr
->len
) {
99 printf("Partition already moved outside trx\n");
102 ptr
->offsets
[2] += (mtdInfo
.erasesize
- 1);
103 ptr
->offsets
[2] &= ~(mtdInfo
.erasesize
- 1);
104 ptr
->len
= ptr
->offsets
[2];
105 ptr
->crc32
= crc32buf((void *) &(ptr
->flag_version
), ptr
->len
- offsetof(struct trx_header
, flag_version
));
106 msync(ptr
,sizeof(struct trx_header
),MS_SYNC
|MS_INVALIDATE
);
107 printf("Partition moved; please reboot\n");
111 printf(" erase: 0x%08x\n",mtdInfo
.erasesize
);
112 printf("=== trx ===\n");
113 printf("mapped: 0x%08x\n", (unsigned)ptr
);
114 printf(" magic: 0x%08x\n", ptr
->magic
);
115 printf(" len: 0x%08x\n", ptr
->len
);
116 printf(" crc: 0x%08x\n", ptr
->crc32
);
117 for (x
= 0; x
< 3; x
++)
118 printf(" offset[%d]: 0x%08x\n", x
, ptr
->offsets
[x
]);
121 munmap((void *) ptr
, len
);
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