/*
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* Copyright (C) 2011 Samsung Electronics
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <string.h>
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#include <sys/stat.h>
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#define BUFSIZE (16*1024)
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#define IMG_SIZE (16*1024)
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#define SPL_HEADER_SIZE 16
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#define FILE_PERM (S_IRUSR | S_IWUSR | S_IRGRP \
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| S_IWGRP | S_IROTH | S_IWOTH)
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#define SPL_HEADER "S5PC210 HEADER "
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/*
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* Requirement:
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* IROM code reads first 14K bytes from boot device.
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* It then calculates the checksum of 14K-4 bytes and compare with data at
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* 14K-4 offset.
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*
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* This function takes two filenames:
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* IN "u-boot-spl.bin" and
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* OUT "$(BOARD)-spl.bin as filenames.
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* It reads the "u-boot-spl.bin" in 16K buffer.
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* It calculates checksum of 14K-4 Bytes and stores at 14K-4 offset in buffer.
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* It writes the buffer to "$(BOARD)-spl.bin" file.
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*/
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int main(int argc, char **argv)
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{
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int i, len;
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unsigned char buffer[BUFSIZE] = {0};
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int ifd, ofd;
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unsigned int checksum = 0, count;
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if (argc != 3) {
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printf(" %d Wrong number of arguments\n", argc);
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exit(EXIT_FAILURE);
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}
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ifd = open(argv[1], O_RDONLY);
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if (ifd < 0) {
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fprintf(stderr, "%s: Can't open %s: %s\n",
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argv[0], argv[1], strerror(errno));
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exit(EXIT_FAILURE);
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}
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ofd = open(argv[2], O_WRONLY | O_CREAT | O_TRUNC, FILE_PERM);
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if (ofd < 0) {
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fprintf(stderr, "%s: Can't open %s: %s\n",
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argv[0], argv[2], strerror(errno));
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if (ifd)
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close(ifd);
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exit(EXIT_FAILURE);
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}
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len = lseek(ifd, 0, SEEK_END);
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lseek(ifd, 0, SEEK_SET);
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memcpy(&buffer[0], SPL_HEADER, SPL_HEADER_SIZE);
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count = (len < (IMG_SIZE - SPL_HEADER_SIZE))
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? len : (IMG_SIZE - SPL_HEADER_SIZE);
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if (read(ifd, buffer + SPL_HEADER_SIZE, count) != count) {
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fprintf(stderr, "%s: Can't read %s: %s\n",
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argv[0], argv[1], strerror(errno));
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if (ifd)
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close(ifd);
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if (ofd)
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close(ofd);
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exit(EXIT_FAILURE);
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}
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for (i = 0; i < IMG_SIZE - SPL_HEADER_SIZE; i++)
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checksum += buffer[i+16];
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*(unsigned long *)buffer ^= 0x1f;
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*(unsigned long *)(buffer+4) ^= checksum;
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for (i = 1; i < SPL_HEADER_SIZE; i++)
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buffer[i] ^= buffer[i-1];
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if (write(ofd, buffer, BUFSIZE) != BUFSIZE) {
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fprintf(stderr, "%s: Can't write %s: %s\n",
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argv[0], argv[2], strerror(errno));
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if (ifd)
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close(ifd);
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if (ofd)
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close(ofd);
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exit(EXIT_FAILURE);
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}
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if (ifd)
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close(ifd);
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if (ofd)
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close(ofd);
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return EXIT_SUCCESS;
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}
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