xref: /openbmc/u-boot/tools/mkexynosspl.c (revision f214a20e)
1 /*
2  * Copyright (C) 2012 Samsung Electronics
3  *
4  * See file CREDITS for list of people who contributed to this
5  * project.
6  *
7  * This program is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU General Public License as
9  * published by the Free Software Foundation; either version 2 of
10  * the License, or (at your option) any later version.
11  *
12  * This program is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15  * GNU General Public License for more details.
16  *
17  * You should have received a copy of the GNU General Public License
18  * along with this program; if not, write to the Free Software
19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
20  * MA 02111-1307 USA
21  */
22 
23 #include <stdio.h>
24 #include <stdlib.h>
25 #include <unistd.h>
26 #include <fcntl.h>
27 #include <errno.h>
28 #include <string.h>
29 #include <sys/stat.h>
30 #include <compiler.h>
31 
32 #define CHECKSUM_OFFSET		(14*1024-4)
33 #define BUFSIZE			(14*1024)
34 #define FILE_PERM		(S_IRUSR | S_IWUSR | S_IRGRP \
35 				| S_IWGRP | S_IROTH | S_IWOTH)
36 /*
37 * Requirement:
38 * IROM code reads first 14K bytes from boot device.
39 * It then calculates the checksum of 14K-4 bytes and compare with data at
40 * 14K-4 offset.
41 *
42 * This function takes two filenames:
43 * IN  "u-boot-spl.bin" and
44 * OUT "$(BOARD)-spl.bin as filenames.
45 * It reads the "u-boot-spl.bin" in 16K buffer.
46 * It calculates checksum of 14K-4 Bytes and stores at 14K-4 offset in buffer.
47 * It writes the buffer to "$(BOARD)-spl.bin" file.
48 */
49 
50 int main(int argc, char **argv)
51 {
52 	unsigned char buffer[BUFSIZE];
53 	int i, ifd, ofd;
54 	uint32_t checksum = 0;
55 	off_t	len;
56 	ssize_t count;
57 	struct stat stat;
58 
59 	if (argc != 3) {
60 		fprintf(stderr, "Usage: %s <infile> <outfile>\n", argv[0]);
61 		exit(EXIT_FAILURE);
62 	}
63 
64 	ifd = open(argv[1], O_RDONLY);
65 	if (ifd < 0) {
66 		fprintf(stderr, "%s: Can't open %s: %s\n",
67 			argv[0], argv[1], strerror(errno));
68 		exit(EXIT_FAILURE);
69 	}
70 
71 	ofd = open(argv[2], O_WRONLY | O_CREAT | O_TRUNC, FILE_PERM);
72 	if (ifd < 0) {
73 		fprintf(stderr, "%s: Can't open %s: %s\n",
74 			argv[0], argv[2], strerror(errno));
75 		close(ifd);
76 		exit(EXIT_FAILURE);
77 	}
78 
79 	if (fstat(ifd, &stat)) {
80 		fprintf(stderr, "%s: Unable to get size of %s: %s\n",
81 			argv[0], argv[1], strerror(errno));
82 		close(ifd);
83 		close(ofd);
84 		exit(EXIT_FAILURE);
85 	}
86 
87 	len = stat.st_size;
88 
89 	count = (len < CHECKSUM_OFFSET) ? len : CHECKSUM_OFFSET;
90 
91 	if (read(ifd, buffer, count) != count) {
92 		fprintf(stderr, "%s: Can't read %s: %s\n",
93 			argv[0], argv[1], strerror(errno));
94 
95 		close(ifd);
96 		close(ofd);
97 
98 		exit(EXIT_FAILURE);
99 	}
100 
101 	for (i = 0, checksum = 0; i < CHECKSUM_OFFSET; i++)
102 		checksum += buffer[i];
103 
104 	checksum = cpu_to_le32(checksum);
105 
106 	memcpy(&buffer[CHECKSUM_OFFSET], &checksum, sizeof(checksum));
107 
108 	if (write(ofd, buffer, BUFSIZE) != BUFSIZE) {
109 		fprintf(stderr, "%s: Can't write %s: %s\n",
110 			argv[0], argv[2], strerror(errno));
111 
112 		close(ifd);
113 		close(ofd);
114 
115 		exit(EXIT_FAILURE);
116 	}
117 
118 	close(ifd);
119 	close(ofd);
120 
121 	return EXIT_SUCCESS;
122 }
123