4 * Copyright (C) 2005 Mike Baker
5 * Copyright (C) 2008 Felix Fietkau <nbd@nbd.name>
6 * Copyrigth (C) 2010 Daniel Dickinson <openwrt@cshore.neomailbox.net>
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; either version 2
11 * of the License, or (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
33 #include <sys/ioctl.h>
34 #include <mtd/mtd-user.h>
39 #define TAGVER_LEN 4 /* Length of Tag Version */
40 #define TAGLAYOUT_LEN 4 /* Length of FlashLayoutVer */
41 #define SIG1_LEN 20 /* Company Signature 1 Length */
42 #define SIG2_LEN 14 /* Company Signature 2 Length */
43 #define BOARDID_LEN 16 /* Length of BoardId */
44 #define ENDIANFLAG_LEN 2 /* Endian Flag Length */
45 #define CHIPID_LEN 6 /* Chip Id Length */
46 #define IMAGE_LEN 10 /* Length of Length Field */
47 #define ADDRESS_LEN 12 /* Length of Address field */
48 #define DUALFLAG_LEN 2 /* Dual Image flag Length */
49 #define INACTIVEFLAG_LEN 2 /* Inactie Flag Length */
50 #define RSASIG_LEN 20 /* Length of RSA Signature in tag */
51 #define TAGINFO1_LEN 30 /* Length of vendor information field1 in tag */
52 #define FLASHLAYOUTVER_LEN 4 /* Length of Flash Layout Version String tag */
53 #define TAGINFO2_LEN 16 /* Length of vendor information field2 in tag */
54 #define ALTTAGINFO_LEN 54 /* Alternate length for vendor information; Pirelli */
57 #define IMAGETAG_CRC_START 0xFFFFFFFF
59 #define PIRELLI_BOARDS { \
64 * The broadcom firmware assumes the rootfs starts the image,
65 * therefore uses the rootfs start (flash_image_address)
66 * to determine where to flash the image. Since we have the kernel first
67 * we have to give it the kernel address, but the crc uses the length
68 * associated with this address (root_length), which is added to the kernel
69 * length (kernel_length) to determine the length of image to flash and thus
70 * needs to be rootfs + deadcode (jffs2 EOF marker)
74 /* 0-3: Version of the image tag */
75 char tag_version[TAGVER_LEN];
76 /* 4-23: Company Line 1 */
78 /* 24-37: Company Line 2 */
80 /* 38-43: Chip this image is for */
81 char chip_id[CHIPID_LEN];
82 /* 44-59: Board name */
83 char board_id[BOARDID_LEN];
84 /* 60-61: Map endianness -- 1 BE 0 LE */
85 char big_endian[ENDIANFLAG_LEN];
86 /* 62-71: Total length of image */
87 char total_length[IMAGE_LEN];
88 /* 72-83: Address in memory of CFE */
89 char cfe__address[ADDRESS_LEN];
90 /* 84-93: Size of CFE */
91 char cfe_length[IMAGE_LEN];
92 /* 94-105: Address in memory of image start
93 * (kernel for OpenWRT, rootfs for stock firmware)
95 char flash_image_start[ADDRESS_LEN];
96 /* 106-115: Size of rootfs */
97 char root_length[IMAGE_LEN];
98 /* 116-127: Address in memory of kernel */
99 char kernel_address[ADDRESS_LEN];
100 /* 128-137: Size of kernel */
101 char kernel_length[IMAGE_LEN];
102 /* 138-139: Unused at the moment */
103 char dual_image[DUALFLAG_LEN];
104 /* 140-141: Unused at the moment */
105 char inactive_flag[INACTIVEFLAG_LEN];
106 /* 142-161: RSA Signature (not used; some vendors may use this) */
107 char rsa_signature[RSASIG_LEN];
108 /* 162-191: Compilation and related information (not used in OpenWrt) */
109 char information1[TAGINFO1_LEN];
110 /* 192-195: Version flash layout */
111 char flash_layout_ver[FLASHLAYOUTVER_LEN];
112 /* 196-199: kernel+rootfs CRC32 */
114 /* 200-215: Unused except on Alice Gate where is is information */
115 char information2[TAGINFO2_LEN];
116 /* 216-219: CRC32 of image less imagetag (kernel for Alice Gate) */
118 /* 220-223: CRC32 of rootfs partition */
120 /* 224-227: CRC32 of kernel partition */
122 /* 228-231: Image sequence number */
123 char image_sequence[4];
124 /* 222-235: Openwrt: real rootfs length */
125 __u32 real_rootfs_length;
126 /* 236-239: CRC32 of header excluding last 20 bytes */
128 /* 240-255: Unused at present */
131 ssize_t pread(int fd, void *buf, size_t count, off_t offset);
132 ssize_t pwrite(int fd, const void *buf, size_t count, off_t offset);
134 #define CRC_START 0xFFFFFFFF
136 static uint32_t strntoul(char *str, char **endptr, int base, size_t len) {
140 newstr = calloc(len + 1, sizeof(char));
142 strncpy(newstr, str, len);
143 res = strtoul(newstr, endptr, base);
149 uint32_t compute_crc32(uint32_t crc, off_t start, size_t compute_len, int fd)
151 uint8_t readbuf[1024];
153 off_t offset = start;
155 /* Read a buffer's worth of bytes */
156 while (fd && (compute_len >= sizeof(readbuf))) {
157 res = pread(fd, readbuf, sizeof(readbuf), offset);
158 crc = crc32(crc, readbuf, res);
159 compute_len = compute_len - res;
163 /* Less than buffer-size bytes remains, read compute_len bytes */
164 if (fd && (compute_len > 0)) {
165 res = pread(fd, readbuf, compute_len, offset);
166 crc = crc32(crc, readbuf, res);
173 trx_fixup(int fd, const char *name)
175 struct mtd_info_user mtdInfo;
181 uint32_t cfelen, imagelen, imagestart, rootfslen;
182 uint32_t imagecrc, rootfscrc, headercrc;
184 cfelen = imagelen = imagestart = imagecrc = rootfscrc = headercrc = rootfslen = 0;
187 if (ioctl(fd, MEMGETINFO, &mtdInfo) < 0) {
188 fprintf(stderr, "Failed to get mtd info\n");
193 if (mtdInfo.size <= 0) {
194 fprintf(stderr, "Invalid MTD device size\n");
198 bfd = mtd_open(name, true);
199 ptr = mmap(NULL, len, PROT_READ|PROT_WRITE, MAP_SHARED, bfd, 0);
200 if (!ptr || (ptr == (void *) -1)) {
205 tag = (struct bcm_tag *) (ptr);
207 cfelen = strntoul(&tag->cfe_length[0], NULL, 10, IMAGE_LEN);
209 fprintf(stderr, "Non-zero CFE length. This is currently unsupported.\n");
213 headercrc = compute_crc32(CRC_START, offset, offsetof(struct bcm_tag, header_crc), fd);
214 if (headercrc != *(uint32_t *)(&tag->header_crc)) {
215 fprintf(stderr, "Tag verify failed. This may not be a valid image.\n");
219 sprintf(&tag->root_length[0], "%u", 0);
220 strncpy(&tag->total_length[0], &tag->kernel_length[0], IMAGE_LEN);
222 imagestart = sizeof(tag);
223 memcpy(&tag->image_crc, &tag->kernel_crc, sizeof(uint32_t));
224 memcpy(&tag->fskernel_crc, &tag->kernel_crc, sizeof(uint32_t));
225 rootfscrc = CRC_START;
226 memcpy(&tag->rootfs_crc, &rootfscrc, sizeof(uint32_t));
227 headercrc = crc32(CRC_START, tag, offsetof(struct bcm_tag, header_crc));
228 memcpy(&tag->header_crc, &headercrc, sizeof(uint32_t));
230 msync(ptr, sizeof(struct bcm_tag), MS_SYNC|MS_INVALIDATE);
238 fprintf(stderr, "Error fixing up imagetag header\n");
244 trx_check(int imagefd, const char *mtd, char *buf, int *len)
246 struct bcm_tag *tag = (const struct bcm_tag *) buf;
251 if (strcmp(mtd, "linux") != 0)
254 *len = read(imagefd, buf, sizeof(struct bcm_tag));
255 if (*len < sizeof(struct bcm_tag)) {
256 fprintf(stdout, "Could not get image header, file too small (%d bytes)\n", *len);
259 headerCRC = crc32buf(buf, offsetof(struct bcm_tag, header_crc));
260 if (*(uint32_t *)(&tag->header_crc) != headerCRC) {
263 fprintf(stderr, "Bad header CRC got %08x, calculated %08x\n",
264 *(uint32_t *)(&tag->header_crc), headerCRC);
265 fprintf(stderr, "This is not the correct file format; refusing to flash.\n"
266 "Please specify the correct file or use -f to force.\n");
271 /* check if image fits to mtd device */
272 fd = mtd_check_open(mtd);
274 fprintf(stderr, "Could not open mtd device: %s\n", mtd);
278 imageLen = strntoul(&tag->total_length[0], NULL, 10, IMAGE_LEN);
280 if(mtdsize < imageLen) {
281 fprintf(stderr, "Image too big for partition: %s\n", mtd);
291 mtd_fixtrx(const char *mtd, size_t offset, size_t data_size)
298 uint32_t cfelen, imagelen, imagestart, rootfslen;
299 uint32_t imagecrc, rootfscrc, headercrc;
300 cfelen = imagelen = imagestart = imagecrc = rootfscrc = headercrc = rootfslen = 0;
303 fprintf(stderr, "Specifying data size in unsupported for imagetag\n");
306 fprintf(stderr, "Trying to fix trx header in %s at 0x%x...\n", mtd, offset);
308 block_offset = offset & ~(erasesize - 1);
309 offset -= block_offset;
311 fd = mtd_check_open(mtd);
313 fprintf(stderr, "Could not open mtd device: %s\n", mtd);
317 if (block_offset + erasesize > mtdsize) {
318 fprintf(stderr, "Offset too large, device size 0x%x\n", mtdsize);
322 buf = malloc(erasesize);
328 res = pread(fd, buf, erasesize, block_offset);
329 if (res != erasesize) {
334 tag = (struct bcm_tag *) (buf + offset);
336 cfelen = strntoul(tag->cfe_length, NULL, 10, IMAGE_LEN);
338 fprintf(stderr, "Non-zero CFE length. This is currently unsupported.\n");
343 fprintf(stderr, "Verifying we actually have an imagetag.\n");
346 headercrc = compute_crc32(CRC_START, offset, offsetof(struct bcm_tag, header_crc), fd);
347 if (headercrc != *(uint32_t *)(&tag->header_crc)) {
348 fprintf(stderr, "Tag verify failed. This may not be a valid image.\n");
353 fprintf(stderr, "Checking current fixed status.\n");
356 rootfslen = strntoul(&tag->root_length[0], NULL, 10, IMAGE_LEN);
357 if (rootfslen == 0) {
359 fprintf(stderr, "Header already fixed, exiting\n");
365 fprintf(stderr, "Setting root length to 0.\n");
368 sprintf(&tag->root_length[0], "%u", 0);
369 strncpy(&tag->total_length[0], &tag->kernel_length[0], IMAGE_LEN);
372 fprintf(stderr, "Recalculating CRCs.\n");
375 imagestart = sizeof(tag);
376 memcpy(&tag->image_crc, &tag->kernel_crc, sizeof(uint32_t));
377 memcpy(&tag->fskernel_crc, &tag->kernel_crc, sizeof(uint32_t));
378 rootfscrc = CRC_START;
379 memcpy(&tag->rootfs_crc, &rootfscrc, sizeof(uint32_t));
380 headercrc = crc32(CRC_START, tag, offsetof(struct bcm_tag, header_crc));
381 memcpy(&tag->header_crc, &headercrc, sizeof(uint32_t));
384 fprintf(stderr, "Erasing imagetag block\n");
387 if (mtd_erase_block(fd, block_offset)) {
388 fprintf(stderr, "Can't erase block at 0x%x (%s)\n", block_offset, strerror(errno));
393 fprintf(stderr, "New image crc32: 0x%x, rewriting block\n",
394 *(uint32_t *)(&tag->image_crc));
395 fprintf(stderr, "New header crc32: 0x%x, rewriting block\n", headercrc);
398 if (pwrite(fd, buf, erasesize, block_offset) != erasesize) {
399 fprintf(stderr, "Error writing block (%s)\n", strerror(errno));
404 fprintf(stderr, "Done.\n");