mtd: Added fixtrx for brcm63xx imagetag. This allows brcm63xx boards which experience...
[openwrt/staging/yousong.git] / package / mtd / src / imagetag.c
1 /*
2 * imagetag.c
3 *
4 * Copyright (C) 2005 Mike Baker
5 * Copyright (C) 2008 Felix Fietkau <nbd@openwrt.org>
6 * Copyrigth (C) 2010 Daniel Dickinson <openwrt@cshore.neomailbox.net>
7 *
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.
12 *
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.
17 *
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.
21 */
22
23 #include <stdio.h>
24 #include <stdlib.h>
25 #include <stddef.h>
26 #include <unistd.h>
27 #include <fcntl.h>
28 #include <sys/mman.h>
29 #include <sys/stat.h>
30 #include <string.h>
31 #include <errno.h>
32
33 #include <sys/ioctl.h>
34 #include "mtd-api.h"
35 #include "mtd.h"
36 #include "crc32.h"
37 #include "bcm_tag.h"
38
39 ssize_t pread(int fd, void *buf, size_t count, off_t offset);
40 ssize_t pwrite(int fd, const void *buf, size_t count, off_t offset);
41
42 #define CRC_START 0xFFFFFFFF
43
44 static uint32_t strntoul(char *str, char **endptr, int base, size_t len) {
45 char *newstr;
46 uint32_t res = 0;
47
48 newstr = calloc(len + 1, sizeof(char));
49 if (newstr) {
50 strncpy(newstr, str, len);
51 res = strtoul(newstr, endptr, base);
52 free(newstr);
53 }
54 return res;
55 }
56
57 uint32_t compute_crc32(uint32_t crc, off_t start, size_t compute_len, int fd)
58 {
59 uint8_t readbuf[1024];
60 ssize_t res;
61 off_t offset = start;
62
63 /* Read a buffer's worth of bytes */
64 while (fd && (compute_len >= sizeof(readbuf))) {
65 res = pread(fd, readbuf, sizeof(readbuf), offset);
66 crc = crc32(crc, readbuf, res);
67 compute_len = compute_len - res;
68 offset += res;
69 }
70
71 /* Less than buffer-size bytes remains, read compute_len bytes */
72 if (fd && (compute_len > 0)) {
73 res = pread(fd, readbuf, compute_len, offset);
74 crc = crc32(crc, readbuf, res);
75 }
76
77 return crc;
78 }
79
80 int
81 trx_check(int imagefd, const char *mtd, char *buf, int *len)
82 {
83 struct bcm_tag *tag = (const struct bcm_tag *) buf;
84 int fd;
85 uint32_t headerCRC;
86 uint32_t imageLen;
87
88 if (strcmp(mtd, "linux") != 0)
89 return 1;
90
91 *len = read(imagefd, buf, sizeof(struct bcm_tag));
92 if (*len < sizeof(struct bcm_tag)) {
93 fprintf(stdout, "Could not get image header, file too small (%d bytes)\n", *len);
94 return 0;
95 }
96 headerCRC = crc32buf(buf, offsetof(struct bcm_tag, headerCRC));
97 if (*(uint32_t *)(&tag->headerCRC[0]) != headerCRC) {
98
99 if (quiet < 2) {
100 fprintf(stderr, "Bad header CRC got %08lx, calculated %08lx\n",
101 *(uint32_t *)(&tag->headerCRC[0]), headerCRC);
102 fprintf(stderr, "This is not the correct file format; refusing to flash.\n"
103 "Please specify the correct file or use -f to force.\n");
104 }
105 return 0;
106 }
107
108 /* check if image fits to mtd device */
109 fd = mtd_check_open(mtd);
110 if(fd < 0) {
111 fprintf(stderr, "Could not open mtd device: %s\n", mtd);
112 exit(1);
113 }
114
115 imageLen = strntoul(&tag->totalLength[0], NULL, 10, IMAGE_LEN);
116
117 if(mtdsize < imageLen) {
118 fprintf(stderr, "Image too big for partition: %s\n", mtd);
119 close(fd);
120 return 0;
121 }
122
123 close(fd);
124 return 1;
125 }
126
127 int
128 mtd_fixtrx(const char *mtd, size_t offset)
129 {
130 int fd;
131 struct bcm_tag *tag;
132 char *buf;
133 ssize_t res;
134 size_t block_offset;
135 uint32_t cfelen, imagelen, imagestart, rootfslen;
136 uint32_t imagecrc, rootfscrc, headercrc;
137 cfelen = imagelen = imagestart = imagecrc = rootfscrc = headercrc = rootfslen = 0;
138
139 if (quiet < 2)
140 fprintf(stderr, "Trying to fix trx header in %s at 0x%x...\n", mtd, offset);
141
142 block_offset = offset & ~(erasesize - 1);
143 offset -= block_offset;
144
145 fd = mtd_check_open(mtd);
146 if(fd < 0) {
147 fprintf(stderr, "Could not open mtd device: %s\n", mtd);
148 exit(1);
149 }
150
151 if (block_offset + erasesize > mtdsize) {
152 fprintf(stderr, "Offset too large, device size 0x%x\n", mtdsize);
153 exit(1);
154 }
155
156 buf = malloc(erasesize);
157 if (!buf) {
158 perror("malloc");
159 exit(1);
160 }
161
162 res = pread(fd, buf, erasesize, block_offset);
163 if (res != erasesize) {
164 perror("pread");
165 exit(1);
166 }
167
168 tag = (struct bcm_tag *) (buf + offset);
169
170 cfelen = strntoul(&tag->cfeLength[0], NULL, 10, IMAGE_LEN);
171 if (cfelen) {
172 fprintf(stderr, "Non-zero CFE length. This is currently unsupported.\n");
173 exit(1);
174 }
175
176 if (quiet < 2) {
177 fprintf(stderr, "Verifying we actually have an imagetag.\n");
178 }
179
180 headercrc = compute_crc32(CRC_START, offset, offsetof(struct bcm_tag, headerCRC), fd);
181 if (headercrc != *(uint32_t *)(&tag->headerCRC[0])) {
182 fprintf(stderr, "Tag verify failed. This may not be a valid image.\n");
183 exit(1);
184 }
185
186 if (quiet < 2) {
187 fprintf(stderr, "Checking current fixed status.\n");
188 }
189
190 rootfslen = strntoul(&tag->rootLength[0], NULL, 10, IMAGE_LEN);
191 if (rootfslen == 0) {
192 if (quiet < 2)
193 fprintf(stderr, "Header already fixed, exiting\n");
194 close(fd);
195 return 0;
196 }
197
198 if (quiet < 2) {
199 fprintf(stderr, "Setting root length to 0.\n");
200 }
201
202 sprintf(&tag->rootLength[0], "%lu", 0);
203 strncpy(&tag->totalLength[0], &tag->kernelLength[0], IMAGE_LEN);
204
205 if (quiet < 2) {
206 fprintf(stderr, "Recalculating CRCs.\n");
207 }
208
209 imagestart = sizeof(tag);
210 memcpy(&tag->imageCRC[0], &tag->kernelCRC[0], CRC_LEN);
211 memcpy(&tag->fskernelCRC[0], &tag->kernelCRC[0], CRC_LEN);
212 rootfscrc = CRC_START;
213 memcpy(&tag->rootfsCRC[0], &rootfscrc, sizeof(uint32_t));
214 headercrc = crc32(CRC_START, tag, offsetof(struct bcm_tag, headerCRC));
215 memcpy(&tag->headerCRC[0], &headercrc, sizeof(uint32_t));
216
217 if (quiet < 2) {
218 fprintf(stderr, "Erasing imagetag block\n");
219 }
220
221 if (mtd_erase_block(fd, block_offset)) {
222 fprintf(stderr, "Can't erase block at 0x%x (%s)\n", block_offset, strerror(errno));
223 exit(1);
224 }
225
226 if (quiet < 2) {
227 fprintf(stderr, "New image crc32: 0x%x, rewriting block\n",
228 *(uint32_t *)(&tag->imageCRC[0]));
229 fprintf(stderr, "New header crc32: 0x%x, rewriting block\n", headercrc);
230 }
231
232 if (pwrite(fd, buf, erasesize, block_offset) != erasesize) {
233 fprintf(stderr, "Error writing block (%s)\n", strerror(errno));
234 exit(1);
235 }
236
237 if (quiet < 2)
238 fprintf(stderr, "Done.\n");
239
240 close (fd);
241 sync();
242 return 0;
243
244 }