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/*
* Copyright (C) 2012 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>
#include <compiler.h>
#define CHECKSUM_OFFSET (14*1024-4)
#define BUFSIZE (14*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 "$(BOARD)-spl.bin as filenames.
* It reads the "u-boot-spl.bin" in 16K buffer.
* It calculates checksum of 14K-4 Bytes and stores at 14K-4 offset in buffer.
* It writes the buffer to "$(BOARD)-spl.bin" file.
*/
int main(int argc, char **argv)
{
unsigned char buffer[BUFSIZE];
int i, ifd, ofd;
uint32_t checksum = 0;
off_t len;
ssize_t count;
struct stat stat;
if (argc != 3) {
fprintf(stderr, "Usage: %s <infile> <outfile>\n", argv[0]);
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 (ifd < 0) {
fprintf(stderr, "%s: Can't open %s: %s\n",
argv[0], argv[2], strerror(errno));
close(ifd);
exit(EXIT_FAILURE);
}
if (fstat(ifd, &stat)) {
fprintf(stderr, "%s: Unable to get size of %s: %s\n",
argv[0], argv[1], strerror(errno));
close(ifd);
close(ofd);
exit(EXIT_FAILURE);
}
len = stat.st_size;
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));
close(ifd);
close(ofd);
exit(EXIT_FAILURE);
}
for (i = 0, checksum = 0; i < CHECKSUM_OFFSET; i++)
checksum += buffer[i];
checksum = cpu_to_le32(checksum);
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));
close(ifd);
close(ofd);
exit(EXIT_FAILURE);
}
close(ifd);
close(ofd);
return EXIT_SUCCESS;
}
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