2 * (C) Copyright 2009 Marco Stornelli
4 * SPDX-License-Identifier: GPL-2.0+
13 #include <sys/types.h>
14 #include <sys/ioctl.h>
21 #include <linux/mtd/mtd.h>
23 #define __user /* nothing */
24 #include <mtd/mtd-user.h>
29 #include <fdt_support.h>
32 #define MIN(a, b) (((a) < (b)) ? (a) : (b))
34 extern unsigned long crc32(unsigned long crc, const char *buf, unsigned int len);
35 static void usage(void);
36 static int image_verify_header(char *ptr, int fd);
37 static int flash_bad_block(int fd, uint8_t mtd_type, loff_t start);
42 unsigned int sectorcount = 0;
44 unsigned int sectoroffset = 0;
45 unsigned int sectorsize = 0;
48 int main (int argc, char **argv)
50 int fd = -1, err = 0, readbyte = 0, j;
51 struct mtd_info_user mtdinfo;
52 char buf[sizeof(image_header_t)];
57 while (--argc > 0 && **++argv == '-') {
63 sectorcount = (unsigned int)atoi(*++argv);
69 sectoroffset = (unsigned int)atoi(*++argv);
75 sectorsize = (unsigned int)atoi(*++argv);
85 if (argc != 1 || cflag == 0 || sflag == 0)
90 fd = open(devicefile, O_RDONLY);
92 fprintf (stderr, "%s: Can't open %s: %s\n",
93 cmdname, devicefile, strerror(errno));
97 err = ioctl(fd, MEMGETINFO, &mtdinfo);
99 fprintf(stderr, "%s: Cannot get MTD information: %s\n",cmdname,
104 if (mtdinfo.type != MTD_NORFLASH && mtdinfo.type != MTD_NANDFLASH) {
105 fprintf(stderr, "%s: Unsupported flash type %u\n",
106 cmdname, mtdinfo.type);
110 if (sectorsize * sectorcount != mtdinfo.size) {
111 fprintf(stderr, "%s: Partition size (%d) incompatible with "
112 "sector size and count\n", cmdname, mtdinfo.size);
116 if (sectorsize * sectoroffset >= mtdinfo.size) {
117 fprintf(stderr, "%s: Partition size (%d) incompatible with "
118 "sector offset given\n", cmdname, mtdinfo.size);
122 if (sectoroffset > sectorcount - 1) {
123 fprintf(stderr, "%s: Sector offset cannot be grater than "
124 "sector count minus one\n", cmdname);
128 printf("Searching....\n");
130 for (j = sectoroffset; j < sectorcount; ++j) {
132 if (lseek(fd, j*sectorsize, SEEK_SET) != j*sectorsize) {
133 fprintf(stderr, "%s: lseek failure: %s\n",
134 cmdname, strerror(errno));
138 err = flash_bad_block(fd, mtdinfo.type, j*sectorsize);
142 continue; /* Skip and jump to next */
144 readbyte = read(fd, buf, sizeof(image_header_t));
145 if (readbyte != sizeof(image_header_t)) {
146 fprintf(stderr, "%s: Can't read from device: %s\n",
147 cmdname, strerror(errno));
151 if (fdt_check_header(buf)) {
152 /* old-style image */
153 if (image_verify_header(buf, fd)) {
155 image_print_contents((image_header_t *)buf);
159 fit_print_contents(buf);
167 printf("No images found\n");
174 fprintf (stderr, "Usage:\n"
175 " %s [-o offset] -s size -c count device\n"
176 " -o ==> number of sectors to use as offset\n"
177 " -c ==> number of sectors\n"
178 " -s ==> size of sectors (byte)\n",
184 static int image_verify_header(char *ptr, int fd)
189 image_header_t *hdr = (image_header_t *)ptr;
192 if (image_get_magic(hdr) != IH_MAGIC)
196 len = image_get_header_size();
198 checksum = image_get_hcrc(hdr);
199 hdr->ih_hcrc = htonl(0); /* clear for re-calculation */
201 if (crc32(0, data, len) != checksum) {
203 "%s: Maybe image found but it has bad header checksum!\n",
208 len = image_get_size(hdr);
212 nread = read(fd, buf, MIN(len,PAGE_SIZE));
213 if (nread != MIN(len,PAGE_SIZE)) {
215 "%s: Error while reading: %s\n",
216 cmdname, strerror(errno));
219 checksum = crc32(checksum, buf, nread);
223 if (checksum != image_get_dcrc(hdr)) {
225 "%s: Maybe image found but it has corrupted data!\n",
234 * Test for bad block on NAND, just returns 0 on NOR, on NAND:
237 * < 0 - failed to test
239 static int flash_bad_block(int fd, uint8_t mtd_type, loff_t start)
241 if (mtd_type == MTD_NANDFLASH) {
242 int badblock = ioctl(fd, MEMGETBADBLOCK, &start);
245 fprintf(stderr,"%s: Cannot read bad block mark: %s\n",
246 cmdname, strerror(errno));