mxc_nb_crcgen.c

i.mx31 3DS平台Nandboot引导程序源码

/*
 * Copyright 2004 Freescale Semiconductor, Inc. All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

/*!
 * @file mxc_nb_crcgen.c
 * 
 * @brief This is an utility program to write crc and image size in Linux kernel
 * image.
 *
 * This program reads Linux kernel image and generates 'Addition CRC'. It 
 * writes the 4 bytes of size and generated crc value at the beginning of the 
 * Linux kernel image.
 *
 * @ingroup NANDboot
 */
#include<stdio.h>

typedef unsigned int U32;
typedef unsigned char U8;

int main(void)
{
        U32 crc = 0;
        U32 i = 0;
        U8 ch;
        FILE *frd, *fwt;
        fpos_t *pos;
        char *imgcrc = "./bin/Image_crc";
        char *img = "./image/Image";

        /* create new image 'Image_crc' with the size and crc written on it */
        fwt = fopen(imgcrc, "wb");
        if (!fwt) {
                printf("Failed to create %s\n", imgcrc);
                return 1;  
        }

        /* open to read the Linux kernel image from image folder */
        frd = fopen(img, "rb");

        if (frd) {
                while (fread(&ch, 1, 1, frd)) {
                        /* 
                         * generate crc by adding each byte from the Linux
                         * kernel image file. The CRC is addition checksum.
                         */
                        crc += ch;
                        i++;
                }

                printf("Image size %d crc %d\n", i, crc);
                /* write 4 bytes of size at the beginning of new image */
                fwrite(&i, 4, 1, fwt);
                /* write 4 bytes of crc after size at the beginning of image */
                fwrite(&crc, 4, 1, fwt);

                /* set the file pointer at start of the file */
                rewind(frd);

                /* copy the Linux kernel image byte by byte to image */
                while (fread(&ch, 1, 1, frd)) {         
                        fwrite(&ch, 1, 1, fwt);
                }

                fclose(frd);    /* close file */
        } else {
                printf("Failed to open %s\n", img);
                return 1;  
        }

        fclose(fwt);    /* close file */

        return 0;
}