blob: 6a8dd937398955083d5ecb2d7f790f63c8314c26 [file] [log] [blame]
Chander Kashyap81e35202012-02-05 23:01:48 +00001/*
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
50int 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}