bt-67xx_universal_hw/projects/gcc/tools/cortex_crc.c

/* cortex_crc -- calculate crc of file and append at end
   crctab and the crc formula is taken from  Linux coreutils cksum.c and is 
   Copyright (C) 1992, 1995-2006, 2008-2010 Free Software Foundation, Inc.
   Written by Q. Frank Xia, qx@math.columbia.edu.
   Cosmetic changes and reorganization by David MacKenzie, djm@gnu.ai.mit.edu.

   How to calculate crc the way the ST cortex processors do was described by www.st.com MySTForum
   post at 8/31/2009 9:11 PM  by brian.d.myers 

   The rest of this source is Copyright (C) 2010 Odd Arild Olsen. 

   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 3 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, see <http://www.gnu.org/licenses/>. 

   to compile: gcc cortex_crc.c -ocortex_crc


   Usage: cortex_crc [file...]

*/

#include <stdio.h>
#include <stdint.h>	
#include <fcntl.h>

uint32_t crc;
uint8_t buf[512];


//----------------------------------------------------------------------------------------------------------------
//
static const uint32_t crctab[256] =
{
  0x00000000,
  0x04c11db7, 0x09823b6e, 0x0d4326d9, 0x130476dc, 0x17c56b6b,
  0x1a864db2, 0x1e475005, 0x2608edb8, 0x22c9f00f, 0x2f8ad6d6,
  0x2b4bcb61, 0x350c9b64, 0x31cd86d3, 0x3c8ea00a, 0x384fbdbd,
  0x4c11db70, 0x48d0c6c7, 0x4593e01e, 0x4152fda9, 0x5f15adac,
  0x5bd4b01b, 0x569796c2, 0x52568b75, 0x6a1936c8, 0x6ed82b7f,
  0x639b0da6, 0x675a1011, 0x791d4014, 0x7ddc5da3, 0x709f7b7a,
  0x745e66cd, 0x9823b6e0, 0x9ce2ab57, 0x91a18d8e, 0x95609039,
  0x8b27c03c, 0x8fe6dd8b, 0x82a5fb52, 0x8664e6e5, 0xbe2b5b58,
  0xbaea46ef, 0xb7a96036, 0xb3687d81, 0xad2f2d84, 0xa9ee3033,
  0xa4ad16ea, 0xa06c0b5d, 0xd4326d90, 0xd0f37027, 0xddb056fe,
  0xd9714b49, 0xc7361b4c, 0xc3f706fb, 0xceb42022, 0xca753d95,
  0xf23a8028, 0xf6fb9d9f, 0xfbb8bb46, 0xff79a6f1, 0xe13ef6f4,
  0xe5ffeb43, 0xe8bccd9a, 0xec7dd02d, 0x34867077, 0x30476dc0,
  0x3d044b19, 0x39c556ae, 0x278206ab, 0x23431b1c, 0x2e003dc5,
  0x2ac12072, 0x128e9dcf, 0x164f8078, 0x1b0ca6a1, 0x1fcdbb16,
  0x018aeb13, 0x054bf6a4, 0x0808d07d, 0x0cc9cdca, 0x7897ab07,
  0x7c56b6b0, 0x71159069, 0x75d48dde, 0x6b93dddb, 0x6f52c06c,
  0x6211e6b5, 0x66d0fb02, 0x5e9f46bf, 0x5a5e5b08, 0x571d7dd1,
  0x53dc6066, 0x4d9b3063, 0x495a2dd4, 0x44190b0d, 0x40d816ba,
  0xaca5c697, 0xa864db20, 0xa527fdf9, 0xa1e6e04e, 0xbfa1b04b,
  0xbb60adfc, 0xb6238b25, 0xb2e29692, 0x8aad2b2f, 0x8e6c3698,
  0x832f1041, 0x87ee0df6, 0x99a95df3, 0x9d684044, 0x902b669d,
  0x94ea7b2a, 0xe0b41de7, 0xe4750050, 0xe9362689, 0xedf73b3e,
  0xf3b06b3b, 0xf771768c, 0xfa325055, 0xfef34de2, 0xc6bcf05f,
  0xc27dede8, 0xcf3ecb31, 0xcbffd686, 0xd5b88683, 0xd1799b34,
  0xdc3abded, 0xd8fba05a, 0x690ce0ee, 0x6dcdfd59, 0x608edb80,
  0x644fc637, 0x7a089632, 0x7ec98b85, 0x738aad5c, 0x774bb0eb,
  0x4f040d56, 0x4bc510e1, 0x46863638, 0x42472b8f, 0x5c007b8a,
  0x58c1663d, 0x558240e4, 0x51435d53, 0x251d3b9e, 0x21dc2629,
  0x2c9f00f0, 0x285e1d47, 0x36194d42, 0x32d850f5, 0x3f9b762c,
  0x3b5a6b9b, 0x0315d626, 0x07d4cb91, 0x0a97ed48, 0x0e56f0ff,
  0x1011a0fa, 0x14d0bd4d, 0x19939b94, 0x1d528623, 0xf12f560e,
  0xf5ee4bb9, 0xf8ad6d60, 0xfc6c70d7, 0xe22b20d2, 0xe6ea3d65,
  0xeba91bbc, 0xef68060b, 0xd727bbb6, 0xd3e6a601, 0xdea580d8,
  0xda649d6f, 0xc423cd6a, 0xc0e2d0dd, 0xcda1f604, 0xc960ebb3,
  0xbd3e8d7e, 0xb9ff90c9, 0xb4bcb610, 0xb07daba7, 0xae3afba2,
  0xaafbe615, 0xa7b8c0cc, 0xa379dd7b, 0x9b3660c6, 0x9ff77d71,
  0x92b45ba8, 0x9675461f, 0x8832161a, 0x8cf30bad, 0x81b02d74,
  0x857130c3, 0x5d8a9099, 0x594b8d2e, 0x5408abf7, 0x50c9b640,
  0x4e8ee645, 0x4a4ffbf2, 0x470cdd2b, 0x43cdc09c, 0x7b827d21,
  0x7f436096, 0x7200464f, 0x76c15bf8, 0x68860bfd, 0x6c47164a,
  0x61043093, 0x65c52d24, 0x119b4be9, 0x155a565e, 0x18197087,
  0x1cd86d30, 0x029f3d35, 0x065e2082, 0x0b1d065b, 0x0fdc1bec,
  0x3793a651, 0x3352bbe6, 0x3e119d3f, 0x3ad08088, 0x2497d08d,
  0x2056cd3a, 0x2d15ebe3, 0x29d4f654, 0xc5a92679, 0xc1683bce,
  0xcc2b1d17, 0xc8ea00a0, 0xd6ad50a5, 0xd26c4d12, 0xdf2f6bcb,
  0xdbee767c, 0xe3a1cbc1, 0xe760d676, 0xea23f0af, 0xeee2ed18,
  0xf0a5bd1d, 0xf464a0aa, 0xf9278673, 0xfde69bc4, 0x89b8fd09,
  0x8d79e0be, 0x803ac667, 0x84fbdbd0, 0x9abc8bd5, 0x9e7d9662,
  0x933eb0bb, 0x97ffad0c, 0xafb010b1, 0xab710d06, 0xa6322bdf,
  0xa2f33668, 0xbcb4666d, 0xb8757bda, 0xb5365d03, 0xb1f740b4
};

void CrcInit(void)
{
	crc = 0xffffffff;
}

uint32_t CortexCrc(uint8_t *src, int len )
{
	uint8_t *bp;
	int idx;
	for (idx=0; idx < len; idx++) {
		bp = src  + (idx^0x3);
		crc = ( crc << 8 ) ^ crctab[ ( ( crc >> 24 ) ^ *bp ) & 0xFF ];
	}
	return crc;
}



int main(int argc, char *argv[])
{
	int n;
	int fd;
	int ret;
	char space= ' ';
	unsigned int offset, flash_start_addr, crc_addr;
	uint32_t* ptr;

	if (argc != 4) {printf("Use: cortex_crc filename, crc_address, flash_start_address (firmware first flash page address)\n");return 1;}

    flash_start_addr = (int)strtol(argv[2], NULL, 0);
    if (flash_start_addr == 0) {
        printf("Wrong flash start address\r\n");
        return 4;
    }

	crc_addr = (int)strtol(argv[3], NULL, 0);
	if (crc_addr == 0) {
	    printf("Wrong CRC address\r\n");
	    return 4;
	}

    if (flash_start_addr >= crc_addr) {
        printf("CRC address can't be lower or equal than flash start address\r\n");
        return 4;
    }

	//printf("Address to append CRC: 0x%X\r\n", crc_addr);
	offset = crc_addr - flash_start_addr;


    fd = open(argv[1], O_RDONLY);
    if(fd < 0) {printf("Can't open file for reading\n");return 2;}

    CrcInit();
    for(ptr=(uint32_t*)flash_start_addr; ptr != (uint32_t*)crc_addr; ptr++) {
        n = read(fd, buf, 4);
        CortexCrc((uint8_t *)buf, 4);
    }

    close(fd);
    if(crc==0) {
        printf("crc is 0, so the crc has already been appended\n");
        return 4;
    }

	fd = open(argv[1], O_WRONLY );
	if(fd < 0) {printf("Can't open file for writing\n");return 5;}

	ret = lseek(fd, offset, SEEK_SET);
	if (ret < 0) {
	    printf("Can't find offset 0x%X in file\r\n", offset);
	    return 4;
	}
	//printf("File offset to append CRC: 0x%X\r\n", ret);

	ret = write(fd, &crc, 4);
	close(fd);
	if (ret == 4) {
	printf("CRC 0x%X appended to file %s at offset 0x%X\r\n", crc, argv[1], offset);
	}
	else {
	    printf("Error: %d\n", ret);
	}
	return 0;
}