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/*
* Copyright (C) 2011 Samsung Electronics
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <string.h>
#include <sys/stat.h>
#define CHECKSUM_OFFSET (14*1024-4)
#define BUFSIZE (16*1024)
#define FILE_PERM (S_IRUSR | S_IWUSR | S_IRGRP \
| S_IWGRP | S_IROTH | S_IWOTH)
/*
* Requirement:
* IROM code reads first 14K bytes from boot device.
* It then calculates the checksum of 14K-4 bytes and compare with data at
* 14K-4 offset.
*
* This function takes two filenames:
* IN "u-boot-spl.bin" and
* OUT "u-boot-mmc-spl.bin" as filenames.
* It reads the "u-boot-spl.bin" in 16K buffer.
* It calculates checksum of 14K-4 Bytes and stores at 14K-4 offset in buffer.
* It writes the buffer to "u-boot-mmc-spl.bin" file.
*/
int main(int argc, char **argv)
{
int i, len;
unsigned char buffer[BUFSIZE] = {0};
int ifd, ofd;
unsigned int checksum = 0, count;
if (argc != 3) {
printf(" %d Wrong number of arguments\n", argc);
exit(EXIT_FAILURE);
}
ifd = open(argv[1], O_RDONLY);
if (ifd < 0) {
fprintf(stderr, "%s: Can't open %s: %s\n",
argv[0], argv[1], strerror(errno));
exit(EXIT_FAILURE);
}
ofd = open(argv[2], O_WRONLY | O_CREAT | O_TRUNC, FILE_PERM);
if (ofd < 0) {
fprintf(stderr, "%s: Can't open %s: %s\n",
argv[0], argv[2], strerror(errno));
if (ifd)
close(ifd);
exit(EXIT_FAILURE);
}
len = lseek(ifd, 0, SEEK_END);
lseek(ifd, 0, SEEK_SET);
count = (len < CHECKSUM_OFFSET) ? len : CHECKSUM_OFFSET;
if (read(ifd, buffer, count) != count) {
fprintf(stderr, "%s: Can't read %s: %s\n",
argv[0], argv[1], strerror(errno));
if (ifd)
close(ifd);
if (ofd)
close(ofd);
exit(EXIT_FAILURE);
}
for (i = 0, checksum = 0; i < CHECKSUM_OFFSET; i++)
checksum += buffer[i];
memcpy(&buffer[CHECKSUM_OFFSET], &checksum, sizeof(checksum));
if (write(ofd, buffer, BUFSIZE) != BUFSIZE) {
fprintf(stderr, "%s: Can't write %s: %s\n",
argv[0], argv[2], strerror(errno));
if (ifd)
close(ifd);
if (ofd)
close(ofd);
exit(EXIT_FAILURE);
}
if (ifd)
close(ifd);
if (ofd)
close(ofd);
return EXIT_SUCCESS;
}
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