1*4882a593Smuzhiyun /*
2*4882a593Smuzhiyun * Copyright (C) 2011 Samsung Electronics
3*4882a593Smuzhiyun *
4*4882a593Smuzhiyun * SPDX-License-Identifier: GPL-2.0+
5*4882a593Smuzhiyun */
6*4882a593Smuzhiyun
7*4882a593Smuzhiyun #include <stdio.h>
8*4882a593Smuzhiyun #include <stdlib.h>
9*4882a593Smuzhiyun #include <unistd.h>
10*4882a593Smuzhiyun #include <fcntl.h>
11*4882a593Smuzhiyun #include <errno.h>
12*4882a593Smuzhiyun #include <string.h>
13*4882a593Smuzhiyun #include <sys/stat.h>
14*4882a593Smuzhiyun
15*4882a593Smuzhiyun #define BUFSIZE (16*1024)
16*4882a593Smuzhiyun #define IMG_SIZE (16*1024)
17*4882a593Smuzhiyun #define SPL_HEADER_SIZE 16
18*4882a593Smuzhiyun #define FILE_PERM (S_IRUSR | S_IWUSR | S_IRGRP \
19*4882a593Smuzhiyun | S_IWGRP | S_IROTH | S_IWOTH)
20*4882a593Smuzhiyun #define SPL_HEADER "S5PC210 HEADER "
21*4882a593Smuzhiyun /*
22*4882a593Smuzhiyun * Requirement:
23*4882a593Smuzhiyun * IROM code reads first 14K bytes from boot device.
24*4882a593Smuzhiyun * It then calculates the checksum of 14K-4 bytes and compare with data at
25*4882a593Smuzhiyun * 14K-4 offset.
26*4882a593Smuzhiyun *
27*4882a593Smuzhiyun * This function takes two filenames:
28*4882a593Smuzhiyun * IN "u-boot-spl.bin" and
29*4882a593Smuzhiyun * OUT "$(BOARD)-spl.bin as filenames.
30*4882a593Smuzhiyun * It reads the "u-boot-spl.bin" in 16K buffer.
31*4882a593Smuzhiyun * It calculates checksum of 14K-4 Bytes and stores at 14K-4 offset in buffer.
32*4882a593Smuzhiyun * It writes the buffer to "$(BOARD)-spl.bin" file.
33*4882a593Smuzhiyun */
34*4882a593Smuzhiyun
main(int argc,char ** argv)35*4882a593Smuzhiyun int main(int argc, char **argv)
36*4882a593Smuzhiyun {
37*4882a593Smuzhiyun int i, len;
38*4882a593Smuzhiyun unsigned char buffer[BUFSIZE] = {0};
39*4882a593Smuzhiyun int ifd, ofd;
40*4882a593Smuzhiyun unsigned int checksum = 0, count;
41*4882a593Smuzhiyun
42*4882a593Smuzhiyun if (argc != 3) {
43*4882a593Smuzhiyun printf(" %d Wrong number of arguments\n", argc);
44*4882a593Smuzhiyun exit(EXIT_FAILURE);
45*4882a593Smuzhiyun }
46*4882a593Smuzhiyun
47*4882a593Smuzhiyun ifd = open(argv[1], O_RDONLY);
48*4882a593Smuzhiyun if (ifd < 0) {
49*4882a593Smuzhiyun fprintf(stderr, "%s: Can't open %s: %s\n",
50*4882a593Smuzhiyun argv[0], argv[1], strerror(errno));
51*4882a593Smuzhiyun exit(EXIT_FAILURE);
52*4882a593Smuzhiyun }
53*4882a593Smuzhiyun
54*4882a593Smuzhiyun ofd = open(argv[2], O_WRONLY | O_CREAT | O_TRUNC, FILE_PERM);
55*4882a593Smuzhiyun if (ofd < 0) {
56*4882a593Smuzhiyun fprintf(stderr, "%s: Can't open %s: %s\n",
57*4882a593Smuzhiyun argv[0], argv[2], strerror(errno));
58*4882a593Smuzhiyun if (ifd)
59*4882a593Smuzhiyun close(ifd);
60*4882a593Smuzhiyun exit(EXIT_FAILURE);
61*4882a593Smuzhiyun }
62*4882a593Smuzhiyun
63*4882a593Smuzhiyun len = lseek(ifd, 0, SEEK_END);
64*4882a593Smuzhiyun lseek(ifd, 0, SEEK_SET);
65*4882a593Smuzhiyun
66*4882a593Smuzhiyun memcpy(&buffer[0], SPL_HEADER, SPL_HEADER_SIZE);
67*4882a593Smuzhiyun
68*4882a593Smuzhiyun count = (len < (IMG_SIZE - SPL_HEADER_SIZE))
69*4882a593Smuzhiyun ? len : (IMG_SIZE - SPL_HEADER_SIZE);
70*4882a593Smuzhiyun
71*4882a593Smuzhiyun if (read(ifd, buffer + SPL_HEADER_SIZE, count) != count) {
72*4882a593Smuzhiyun fprintf(stderr, "%s: Can't read %s: %s\n",
73*4882a593Smuzhiyun argv[0], argv[1], strerror(errno));
74*4882a593Smuzhiyun
75*4882a593Smuzhiyun if (ifd)
76*4882a593Smuzhiyun close(ifd);
77*4882a593Smuzhiyun if (ofd)
78*4882a593Smuzhiyun close(ofd);
79*4882a593Smuzhiyun
80*4882a593Smuzhiyun exit(EXIT_FAILURE);
81*4882a593Smuzhiyun }
82*4882a593Smuzhiyun
83*4882a593Smuzhiyun for (i = 0; i < IMG_SIZE - SPL_HEADER_SIZE; i++)
84*4882a593Smuzhiyun checksum += buffer[i+16];
85*4882a593Smuzhiyun
86*4882a593Smuzhiyun *(unsigned long *)buffer ^= 0x1f;
87*4882a593Smuzhiyun *(unsigned long *)(buffer+4) ^= checksum;
88*4882a593Smuzhiyun
89*4882a593Smuzhiyun for (i = 1; i < SPL_HEADER_SIZE; i++)
90*4882a593Smuzhiyun buffer[i] ^= buffer[i-1];
91*4882a593Smuzhiyun
92*4882a593Smuzhiyun if (write(ofd, buffer, BUFSIZE) != BUFSIZE) {
93*4882a593Smuzhiyun fprintf(stderr, "%s: Can't write %s: %s\n",
94*4882a593Smuzhiyun argv[0], argv[2], strerror(errno));
95*4882a593Smuzhiyun
96*4882a593Smuzhiyun if (ifd)
97*4882a593Smuzhiyun close(ifd);
98*4882a593Smuzhiyun if (ofd)
99*4882a593Smuzhiyun close(ofd);
100*4882a593Smuzhiyun
101*4882a593Smuzhiyun exit(EXIT_FAILURE);
102*4882a593Smuzhiyun }
103*4882a593Smuzhiyun
104*4882a593Smuzhiyun if (ifd)
105*4882a593Smuzhiyun close(ifd);
106*4882a593Smuzhiyun if (ofd)
107*4882a593Smuzhiyun close(ofd);
108*4882a593Smuzhiyun
109*4882a593Smuzhiyun return EXIT_SUCCESS;
110*4882a593Smuzhiyun }
111