tools/mkexynosspl.c

   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 }