2 * (C) Copyright 2009 Marco Stornelli
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License as
6 * published by the Free Software Foundation; either version 2 of
7 * the License, or (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
26 #include <sys/types.h>
27 #include <sys/ioctl.h>
34 #include <linux/mtd/mtd.h>
36 #define __user /* nothing */
37 #include <mtd/mtd-user.h>
43 #include <fdt_support.h>
46 #define MIN(a, b) (((a) < (b)) ? (a) : (b))
48 extern unsigned long crc32(unsigned long crc, const char *buf, unsigned int len);
49 static void usage(void);
50 static int image_verify_header(char *ptr, int fd);
51 static int flash_bad_block(int fd, uint8_t mtd_type, loff_t start);
56 unsigned int sectorcount = 0;
58 unsigned int sectoroffset = 0;
59 unsigned int sectorsize = 0;
62 int main (int argc, char **argv)
64 int fd = -1, err = 0, readbyte = 0, j;
65 struct mtd_info_user mtdinfo;
66 char buf[sizeof(image_header_t)];
71 while (--argc > 0 && **++argv == '-') {
77 sectorcount = (unsigned int)atoi(*++argv);
83 sectoroffset = (unsigned int)atoi(*++argv);
89 sectorsize = (unsigned int)atoi(*++argv);
99 if (argc != 1 || cflag == 0 || sflag == 0)
104 fd = open(devicefile, O_RDONLY);
106 fprintf (stderr, "%s: Can't open %s: %s\n",
107 cmdname, devicefile, strerror(errno));
111 err = ioctl(fd, MEMGETINFO, &mtdinfo);
113 fprintf(stderr, "%s: Cannot get MTD information: %s\n",cmdname,
118 if (mtdinfo.type != MTD_NORFLASH && mtdinfo.type != MTD_NANDFLASH) {
119 fprintf(stderr, "%s: Unsupported flash type %u\n",
120 cmdname, mtdinfo.type);
124 if (sectorsize * sectorcount != mtdinfo.size) {
125 fprintf(stderr, "%s: Partition size (%d) incompatible with "
126 "sector size and count\n", cmdname, mtdinfo.size);
130 if (sectorsize * sectoroffset >= mtdinfo.size) {
131 fprintf(stderr, "%s: Partition size (%d) incompatible with "
132 "sector offset given\n", cmdname, mtdinfo.size);
136 if (sectoroffset > sectorcount - 1) {
137 fprintf(stderr, "%s: Sector offset cannot be grater than "
138 "sector count minus one\n", cmdname);
142 printf("Searching....\n");
144 for (j = sectoroffset; j < sectorcount; ++j) {
146 if (lseek(fd, j*sectorsize, SEEK_SET) != j*sectorsize) {
147 fprintf(stderr, "%s: lseek failure: %s\n",
148 cmdname, strerror(errno));
152 err = flash_bad_block(fd, mtdinfo.type, j*sectorsize);
156 continue; /* Skip and jump to next */
158 readbyte = read(fd, buf, sizeof(image_header_t));
159 if (readbyte != sizeof(image_header_t)) {
160 fprintf(stderr, "%s: Can't read from device: %s\n",
161 cmdname, strerror(errno));
165 if (fdt_check_header(buf)) {
166 /* old-style image */
167 if (image_verify_header(buf, fd)) {
169 image_print_contents((image_header_t *)buf);
173 fit_print_contents(buf);
181 printf("No images found\n");
188 fprintf (stderr, "Usage:\n"
189 " %s [-o offset] -s size -c count device\n"
190 " -o ==> number of sectors to use as offset\n"
191 " -c ==> number of sectors\n"
192 " -s ==> size of sectors (byte)\n",
198 static int image_verify_header(char *ptr, int fd)
203 image_header_t *hdr = (image_header_t *)ptr;
206 if (image_get_magic(hdr) != IH_MAGIC)
210 len = image_get_header_size();
212 checksum = image_get_hcrc(hdr);
213 hdr->ih_hcrc = htonl(0); /* clear for re-calculation */
215 if (crc32(0, data, len) != checksum) {
217 "%s: Maybe image found but it has bad header checksum!\n",
222 len = image_get_size(hdr);
226 nread = read(fd, buf, MIN(len,PAGE_SIZE));
227 if (nread != MIN(len,PAGE_SIZE)) {
229 "%s: Error while reading: %s\n",
230 cmdname, strerror(errno));
233 checksum = crc32(checksum, buf, nread);
237 if (checksum != image_get_dcrc(hdr)) {
239 "%s: Maybe image found but it has corrupted data!\n",
248 * Test for bad block on NAND, just returns 0 on NOR, on NAND:
251 * < 0 - failed to test
253 static int flash_bad_block(int fd, uint8_t mtd_type, loff_t start)
255 if (mtd_type == MTD_NANDFLASH) {
256 int badblock = ioctl(fd, MEMGETBADBLOCK, &start);
259 fprintf(stderr,"%s: Cannot read bad block mark: %s\n",
260 cmdname, strerror(errno));