LXR uboot/mmc_spl/board/samsung/smdkv310/tools/mkv310

   1/*
   2 * Copyright (C) 2011 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
  30#define CHECKSUM_OFFSET         (14*1024-4)
  31#define BUFSIZE                 (16*1024)
  32#define FILE_PERM               (S_IRUSR | S_IWUSR | S_IRGRP \
  33                                | S_IWGRP | S_IROTH | S_IWOTH)
  34/*
  35* Requirement:
  36* IROM code reads first 14K bytes from boot device.
  37* It then calculates the checksum of 14K-4 bytes and compare with data at
  38* 14K-4 offset.
  39*
  40* This function takes two filenames:
  41* IN  "u-boot-spl.bin" and
  42* OUT "u-boot-mmc-spl.bin" as filenames.
  43* It reads the "u-boot-spl.bin" in 16K buffer.
  44* It calculates checksum of 14K-4 Bytes and stores at 14K-4 offset in buffer.
  45* It writes the buffer to "u-boot-mmc-spl.bin" file.
  46*/
  47
  48int main(int argc, char **argv)
  49{
  50        int i, len;
  51        unsigned char buffer[BUFSIZE] = {0};
  52        int ifd, ofd;
  53        unsigned int checksum = 0, count;
  54
  55        if (argc != 3) {
  56                printf(" %d Wrong number of arguments\n", argc);
  57                exit(EXIT_FAILURE);
  58        }
  59
  60        ifd = open(argv[1], O_RDONLY);
  61        if (ifd < 0) {
  62                fprintf(stderr, "%s: Can't open %s: %s\n",
  63                        argv[0], argv[1], strerror(errno));
  64                exit(EXIT_FAILURE);
  65        }
  66
  67        ofd = open(argv[2], O_WRONLY | O_CREAT | O_TRUNC, FILE_PERM);
  68        if (ifd < 0) {
  69                fprintf(stderr, "%s: Can't open %s: %s\n",
  70                        argv[0], argv[2], strerror(errno));
  71                if (ifd)
  72                        close(ifd);
  73                exit(EXIT_FAILURE);
  74        }
  75
  76        len = lseek(ifd, 0, SEEK_END);
  77        lseek(ifd, 0, SEEK_SET);
  78
  79        count = (len < CHECKSUM_OFFSET) ? len : CHECKSUM_OFFSET;
  80
  81        if (read(ifd, buffer, count) != count) {
  82                fprintf(stderr, "%s: Can't read %s: %s\n",
  83                        argv[0], argv[1], strerror(errno));
  84
  85                if (ifd)
  86                        close(ifd);
  87                if (ofd)
  88                        close(ofd);
  89
  90                exit(EXIT_FAILURE);
  91        }
  92
  93        for (i = 0, checksum = 0; i < CHECKSUM_OFFSET; i++)
  94                checksum += buffer[i];
  95
  96        memcpy(&buffer[CHECKSUM_OFFSET], &checksum, sizeof(checksum));
  97
  98        if (write(ofd, buffer, BUFSIZE) != BUFSIZE) {
  99                fprintf(stderr, "%s: Can't write %s: %s\n",
 100                        argv[0], argv[2], strerror(errno));
 101
 102                if (ifd)
 103                        close(ifd);
 104                if (ofd)
 105                        close(ofd);
 106
 107                exit(EXIT_FAILURE);
 108        }
 109
 110        if (ifd)
 111                close(ifd);
 112        if (ofd)
 113                close(ofd);
 114
 115        return EXIT_SUCCESS;
 116}
 117