4 * Copyright (C) 2005 Mike Baker
5 * Copyright (C) 2008 Felix Fietkau <nbd@openwrt.org>
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version 2
10 * of the License, or (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
31 #include <sys/ioctl.h>
35 #define TRX_MAGIC 0x30524448 /* "HDR0" */
37 unsigned magic; /* "HDR0" */
38 unsigned len; /* Length of file including header */
39 unsigned crc32; /* 32-bit CRC from flag_version to end of file */
40 unsigned flag_version; /* 0:15 flags, 16:31 version */
41 unsigned offsets[3]; /* Offsets of partitions from start of header */
44 static unsigned long *crc32 = NULL;
46 static void init_crc32()
49 unsigned long poly = 0xEDB88320L;
55 crc32 = (unsigned long *) malloc(256 * sizeof(unsigned long));
61 for (n = 0; n < 256; n++) {
62 crc = (unsigned long) n;
63 for (bit = 0; bit < 8; bit++)
64 crc = (crc & 1) ? (poly ^ (crc >> 1)) : (crc >> 1);
69 static unsigned int crc32buf(char *buf, size_t len)
71 unsigned int crc = 0xFFFFFFFF;
72 for (; len; len--, buf++)
73 crc = crc32[(crc ^ *buf) & 0xff] ^ (crc >> 8);
78 trx_fixup(int fd, const char *name)
80 struct mtd_info_user mtdInfo;
82 struct trx_header *trx;
86 if (ioctl(fd, MEMGETINFO, &mtdInfo) < 0) {
87 fprintf(stderr, "Failed to get mtd info\n");
92 if (mtdInfo.size <= 0) {
93 fprintf(stderr, "Invalid MTD device size\n");
97 bfd = mtd_open(name, true);
98 ptr = mmap(NULL, len, PROT_READ|PROT_WRITE, MAP_SHARED, bfd, 0);
99 if (!ptr || (ptr == (void *) -1)) {
105 if (trx->magic != TRX_MAGIC) {
106 fprintf(stderr, "TRX header not found\n");
111 scan = ptr + offsetof(struct trx_header, flag_version);
112 trx->crc32 = crc32buf(scan, trx->len - (scan - ptr));
113 msync(ptr, sizeof(struct trx_header), MS_SYNC|MS_INVALIDATE);
121 fprintf(stderr, "Error fixing up TRX header\n");
126 trx_check(int imagefd, const char *mtd, char *buf, int *len)
128 const struct trx_header *trx = (const struct trx_header *) buf;
131 if (strcmp(mtd, "linux") != 0)
134 *len = read(imagefd, buf, 32);
136 fprintf(stdout, "Could not get image header, file too small (%d bytes)\n", *len);
140 if (trx->magic != TRX_MAGIC || trx->len < sizeof(struct trx_header)) {
142 fprintf(stderr, "Bad trx header\n");
143 fprintf(stderr, "This is not the correct file format; refusing to flash.\n"
144 "Please specify the correct file or use -f to force.\n");
149 /* check if image fits to mtd device */
150 fd = mtd_check_open(mtd);
152 fprintf(stderr, "Could not open mtd device: %s\n", mtd);
156 if(mtdsize < trx->len) {
157 fprintf(stderr, "Image too big for partition: %s\n", mtd);