/* * Copyright (C) 2012 Samsung Electronics * * See file CREDITS for list of people who contributed to this * project. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation; either version 2 of * the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, * MA 02111-1307 USA */ #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; }