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