The bootrom only reads an image if the correct checksum is present in the header. The calculation is pretty simple: sum over all words from 0x20 to 0x44 Two of this words are the image length. That is why the checksum can not be calculated until barebox_image_size is known. The easiest solution is a program that has to be run after make. Signed-off-by: Steffen Trumtrar <s.trumtrar@pengutronix.de> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
87 lines
1.7 KiB
C
87 lines
1.7 KiB
C
/*
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* Copyright (C) 2013 Steffen Trumtrar <s.trumtrar@pengutronix.de>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <endian.h>
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#include <errno.h>
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#include <malloc.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/stat.h>
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static void usage(char *name)
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{
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printf("Usage: %s barebox-flash-image <outfile>\n", name);
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}
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int main(int argc, char *argv[])
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{
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FILE *ifile, *ofile;
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unsigned int *buf;
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const char *infile;
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const char *outfile;
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struct stat st;
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unsigned int i;
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unsigned long sum = 0;
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if (argc != 3) {
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usage(argv[0]);
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exit(1);
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}
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infile = argv[1];
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outfile = argv[2];
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if (stat(infile, &st) == -1) {
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perror("stat");
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exit(EXIT_FAILURE);
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}
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buf = malloc(st.st_size);
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if (!buf) {
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fprintf(stderr, "Unable to allocate buffer\n");
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return -1;
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}
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ifile = fopen(infile, "rb");
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if (!ifile) {
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fprintf(stderr, "Cannot open %s for reading\n",
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infile);
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free(buf);
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exit(EXIT_FAILURE);
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}
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ofile = fopen(outfile, "wb");
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if (!ofile) {
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fprintf(stderr, "Cannot open %s for writing\n",
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outfile);
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fclose(ifile);
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free(buf);
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exit(EXIT_FAILURE);
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}
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fread(buf, 4, st.st_size, ifile);
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for (i = 0x8; i < 0x12; i++)
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sum += htole32(buf[i]);
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sum = ~sum;
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buf[i] = sum;
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fwrite(buf, st.st_size / 4, 4, ofile);
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fclose(ofile);
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fclose(ifile);
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free(buf);
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return 0;
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}
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