1e183a174SMasahiro Yamada /* 2e183a174SMasahiro Yamada * Copyright (C) 2011 Samsung Electronics 3e183a174SMasahiro Yamada * 4e183a174SMasahiro Yamada * SPDX-License-Identifier: GPL-2.0+ 5e183a174SMasahiro Yamada */ 6e183a174SMasahiro Yamada 7e183a174SMasahiro Yamada #include <stdio.h> 8e183a174SMasahiro Yamada #include <stdlib.h> 9e183a174SMasahiro Yamada #include <unistd.h> 10e183a174SMasahiro Yamada #include <fcntl.h> 11e183a174SMasahiro Yamada #include <errno.h> 12e183a174SMasahiro Yamada #include <string.h> 13e183a174SMasahiro Yamada #include <sys/stat.h> 14e183a174SMasahiro Yamada 15e183a174SMasahiro Yamada #define BUFSIZE (16*1024) 16e183a174SMasahiro Yamada #define IMG_SIZE (16*1024) 17e183a174SMasahiro Yamada #define SPL_HEADER_SIZE 16 18e183a174SMasahiro Yamada #define FILE_PERM (S_IRUSR | S_IWUSR | S_IRGRP \ 19e183a174SMasahiro Yamada | S_IWGRP | S_IROTH | S_IWOTH) 20e183a174SMasahiro Yamada #define SPL_HEADER "S5PC210 HEADER " 21e183a174SMasahiro Yamada /* 22e183a174SMasahiro Yamada * Requirement: 23e183a174SMasahiro Yamada * IROM code reads first 14K bytes from boot device. 24e183a174SMasahiro Yamada * It then calculates the checksum of 14K-4 bytes and compare with data at 25e183a174SMasahiro Yamada * 14K-4 offset. 26e183a174SMasahiro Yamada * 27e183a174SMasahiro Yamada * This function takes two filenames: 28e183a174SMasahiro Yamada * IN "u-boot-spl.bin" and 29e183a174SMasahiro Yamada * OUT "$(BOARD)-spl.bin as filenames. 30e183a174SMasahiro Yamada * It reads the "u-boot-spl.bin" in 16K buffer. 31e183a174SMasahiro Yamada * It calculates checksum of 14K-4 Bytes and stores at 14K-4 offset in buffer. 32e183a174SMasahiro Yamada * It writes the buffer to "$(BOARD)-spl.bin" file. 33e183a174SMasahiro Yamada */ 34e183a174SMasahiro Yamada 35e183a174SMasahiro Yamada int main(int argc, char **argv) 36e183a174SMasahiro Yamada { 37e183a174SMasahiro Yamada int i, len; 38e183a174SMasahiro Yamada unsigned char buffer[BUFSIZE] = {0}; 39e183a174SMasahiro Yamada int ifd, ofd; 40e183a174SMasahiro Yamada unsigned int checksum = 0, count; 41e183a174SMasahiro Yamada 42e183a174SMasahiro Yamada if (argc != 3) { 43e183a174SMasahiro Yamada printf(" %d Wrong number of arguments\n", argc); 44e183a174SMasahiro Yamada exit(EXIT_FAILURE); 45e183a174SMasahiro Yamada } 46e183a174SMasahiro Yamada 47e183a174SMasahiro Yamada ifd = open(argv[1], O_RDONLY); 48e183a174SMasahiro Yamada if (ifd < 0) { 49e183a174SMasahiro Yamada fprintf(stderr, "%s: Can't open %s: %s\n", 50e183a174SMasahiro Yamada argv[0], argv[1], strerror(errno)); 51e183a174SMasahiro Yamada exit(EXIT_FAILURE); 52e183a174SMasahiro Yamada } 53e183a174SMasahiro Yamada 54e183a174SMasahiro Yamada ofd = open(argv[2], O_WRONLY | O_CREAT | O_TRUNC, FILE_PERM); 55*310ae37eSThomas Huth if (ofd < 0) { 56e183a174SMasahiro Yamada fprintf(stderr, "%s: Can't open %s: %s\n", 57e183a174SMasahiro Yamada argv[0], argv[2], strerror(errno)); 58e183a174SMasahiro Yamada if (ifd) 59e183a174SMasahiro Yamada close(ifd); 60e183a174SMasahiro Yamada exit(EXIT_FAILURE); 61e183a174SMasahiro Yamada } 62e183a174SMasahiro Yamada 63e183a174SMasahiro Yamada len = lseek(ifd, 0, SEEK_END); 64e183a174SMasahiro Yamada lseek(ifd, 0, SEEK_SET); 65e183a174SMasahiro Yamada 66e183a174SMasahiro Yamada memcpy(&buffer[0], SPL_HEADER, SPL_HEADER_SIZE); 67e183a174SMasahiro Yamada 68e183a174SMasahiro Yamada count = (len < (IMG_SIZE - SPL_HEADER_SIZE)) 69e183a174SMasahiro Yamada ? len : (IMG_SIZE - SPL_HEADER_SIZE); 70e183a174SMasahiro Yamada 71e183a174SMasahiro Yamada if (read(ifd, buffer + SPL_HEADER_SIZE, count) != count) { 72e183a174SMasahiro Yamada fprintf(stderr, "%s: Can't read %s: %s\n", 73e183a174SMasahiro Yamada argv[0], argv[1], strerror(errno)); 74e183a174SMasahiro Yamada 75e183a174SMasahiro Yamada if (ifd) 76e183a174SMasahiro Yamada close(ifd); 77e183a174SMasahiro Yamada if (ofd) 78e183a174SMasahiro Yamada close(ofd); 79e183a174SMasahiro Yamada 80e183a174SMasahiro Yamada exit(EXIT_FAILURE); 81e183a174SMasahiro Yamada } 82e183a174SMasahiro Yamada 83e183a174SMasahiro Yamada for (i = 0; i < IMG_SIZE - SPL_HEADER_SIZE; i++) 84e183a174SMasahiro Yamada checksum += buffer[i+16]; 85e183a174SMasahiro Yamada 86e183a174SMasahiro Yamada *(ulong *)buffer ^= 0x1f; 87e183a174SMasahiro Yamada *(ulong *)(buffer+4) ^= checksum; 88e183a174SMasahiro Yamada 89e183a174SMasahiro Yamada for (i = 1; i < SPL_HEADER_SIZE; i++) 90e183a174SMasahiro Yamada buffer[i] ^= buffer[i-1]; 91e183a174SMasahiro Yamada 92e183a174SMasahiro Yamada if (write(ofd, buffer, BUFSIZE) != BUFSIZE) { 93e183a174SMasahiro Yamada fprintf(stderr, "%s: Can't write %s: %s\n", 94e183a174SMasahiro Yamada argv[0], argv[2], strerror(errno)); 95e183a174SMasahiro Yamada 96e183a174SMasahiro Yamada if (ifd) 97e183a174SMasahiro Yamada close(ifd); 98e183a174SMasahiro Yamada if (ofd) 99e183a174SMasahiro Yamada close(ofd); 100e183a174SMasahiro Yamada 101e183a174SMasahiro Yamada exit(EXIT_FAILURE); 102e183a174SMasahiro Yamada } 103e183a174SMasahiro Yamada 104e183a174SMasahiro Yamada if (ifd) 105e183a174SMasahiro Yamada close(ifd); 106e183a174SMasahiro Yamada if (ofd) 107e183a174SMasahiro Yamada close(ofd); 108e183a174SMasahiro Yamada 109e183a174SMasahiro Yamada return EXIT_SUCCESS; 110e183a174SMasahiro Yamada } 111