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annotate bootutil/c139-patch-dmagic.c @ 27:9e7ca43275eb

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doc/Pirelli-VPM-howto: new article
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 12 Jun 2023 04:21:16 +0000
parents 6b0d533046e5
children
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6b0d533046e5 bootutil: add c139-patch-dmagic
Mychaela Falconia <falcon@freecalypso.org>
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1 /*
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2 * This program patches DD DD DD DD magic bytes into the given binary file
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3 * at offset 0x2060, thereby turning a locked C11x/12x or C139/140 flash image
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4 * into an unlocked one.
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5 */
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6
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7 #include <sys/types.h>
6b0d533046e5 bootutil: add c139-patch-dmagic
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8 #include <sys/file.h>
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9 #include <sys/stat.h>
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10 #include <stdio.h>
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11 #include <stdlib.h>
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12 #include <unistd.h>
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13
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14 static u_char magic[4] = {0xDD, 0xDD, 0xDD, 0xDD};
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15
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16 main(argc, argv)
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17 char **argv;
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18 {
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19 int fd;
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20 struct stat st;
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21
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22 if (argc != 2) {
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23 fprintf(stderr, "usage: %s flashimage.bin\n", argv[0]);
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24 exit(1);
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25 }
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26 fd = open(argv[1], O_RDWR);
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27 if (fd < 0) {
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28 perror(argv[1]);
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29 exit(1);
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30 }
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31 fstat(fd, &st);
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32 if (!S_ISREG(st.st_mode)) {
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33 fprintf(stderr, "error: %s is not a regular file\n", argv[1]);
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34 exit(1);
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35 }
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36 if (st.st_size < 0x2064) {
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37 fprintf(stderr, "error: %s is too short\n", argv[1]);
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38 exit(1);
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39 }
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40 lseek(fd, 0x2060, SEEK_SET);
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41 if (write(fd, magic, 4) != 4) {
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42 perror("error writing to file");
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43 exit(1);
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44 }
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45 exit(0);
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46 }