115 lines
2.8 KiB
C
115 lines
2.8 KiB
C
/*
|
|
* (C) Copyright 2013
|
|
* Patrick H Wood, 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
|
|
*
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#include <strings.h>
|
|
#include <fcntl.h>
|
|
#include "nand-common.h"
|
|
|
|
void usage(const char *cmd)
|
|
{
|
|
printf("usage: %s nand-device 'name2 len2 [usertype2]' ['name3 len3 [usertype3]'] ...\n", cmd);
|
|
printf("or %s nand-device [-f] start1 'name1 len1 [usertype1]' ['name2 len2 [usertype2]'] ...\n", cmd);
|
|
}
|
|
|
|
typedef struct tag_CRC32_DATA
|
|
{
|
|
__u32 CRC; //int的大小是32位
|
|
__u32 CRC_32_Tbl[256]; //用来保存码表
|
|
}CRC32_DATA_t;
|
|
|
|
__u32 calc_crc32(void * buffer, __u32 length)
|
|
{
|
|
__u32 i, j;
|
|
CRC32_DATA_t crc32; //
|
|
__u32 CRC32 = 0xffffffff; //设置初始值
|
|
crc32.CRC = 0;
|
|
|
|
for( i = 0; i < 256; ++i)//用++i以提高效率
|
|
{
|
|
crc32.CRC = i;
|
|
for( j = 0; j < 8 ; ++j)
|
|
{
|
|
//这个循环实际上就是用"计算法"来求取CRC的校验码
|
|
if(crc32.CRC & 1)
|
|
crc32.CRC = (crc32.CRC >> 1) ^ 0xEDB88320;
|
|
else //0xEDB88320就是CRC-32多项表达式的值
|
|
crc32.CRC >>= 1;
|
|
}
|
|
crc32.CRC_32_Tbl[i] = crc32.CRC;
|
|
}
|
|
|
|
CRC32 = 0xffffffff; //设置初始值
|
|
for( i = 0; i < length; ++i)
|
|
{
|
|
CRC32 = crc32.CRC_32_Tbl[(CRC32^((unsigned char*)buffer)[i]) & 0xff] ^ (CRC32>>8);
|
|
}
|
|
//return CRC32;
|
|
return CRC32^0xffffffff;
|
|
}
|
|
|
|
int main (int argc, char **argv)
|
|
{
|
|
char *nand = "/dev/nand";
|
|
const char *cmd = argv[0];
|
|
int fd;
|
|
int force = 0; // force write even if magics and CRCs don't match
|
|
|
|
argc--;
|
|
argv++;
|
|
|
|
if (argc > 1) {
|
|
if (!strcmp(argv[0], "-f")) {
|
|
if (!strcasecmp(argv[1], "a10"))
|
|
force = 10;
|
|
else if (!strcasecmp(argv[1], "a20"))
|
|
force = 20;
|
|
else {
|
|
usage(cmd);
|
|
return -1;
|
|
}
|
|
argc -= 2;
|
|
argv += 2;
|
|
}
|
|
}
|
|
|
|
if (argc > 0) {
|
|
nand = argv[0];
|
|
argc--;
|
|
argv++;
|
|
}
|
|
fd = open(nand, O_RDWR);
|
|
if (fd < 0) {
|
|
usage(cmd);
|
|
return -2;
|
|
}
|
|
if (force == 10)
|
|
return nand_part_a10 (argc, argv, cmd, fd, force);
|
|
if (force == 20)
|
|
return nand_part_a20 (argc, argv, cmd, fd, force);
|
|
|
|
if (checkmbrs_a10(fd))
|
|
return nand_part_a10 (argc, argv, cmd, fd, force);
|
|
if (checkmbrs_a20(fd))
|
|
return nand_part_a20 (argc, argv, cmd, fd, force);
|
|
}
|