117 lines
2.8 KiB
C
117 lines
2.8 KiB
C
/*
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* (C) Copyright 2013
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* Patrick H Wood, All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*
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*/
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#include <stdio.h>
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#include <string.h>
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#include <strings.h>
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#include <errno.h>
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#include <fcntl.h>
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#include "nand-common.h"
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int checkmbrs_a64(int fd);
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int nand_part_a64(int argc, char **argv, const char *cmd, int fd, int force);
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void usage(const char *cmd)
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{
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printf("usage: %s [-f a64] nand-device\n", cmd);
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printf(" %s nand-device 'name2 len2 [usertype2]' ['name3 len3 [usertype3]'] ...\n", cmd);
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printf(" %s [-f a64] nand-device start1 'name1 len1 [usertype1]' ['name2 len2 [usertype2]'] ...\n", cmd);
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}
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typedef struct tag_CRC32_DATA
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{
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__u32 CRC; //int的大小是32位
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__u32 CRC_32_Tbl[256]; //用来保存码表
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}CRC32_DATA_t;
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__u32 calc_crc32(void * buffer, __u32 length)
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{
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__u32 i, j;
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CRC32_DATA_t crc32; //
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__u32 CRC32 = 0xffffffff; //设置初始值
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crc32.CRC = 0;
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for( i = 0; i < 256; ++i)//用++i以提高效率
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{
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crc32.CRC = i;
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for( j = 0; j < 8 ; ++j)
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{
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//这个循环实际上就是用"计算法"来求取CRC的校验码
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if(crc32.CRC & 1)
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crc32.CRC = (crc32.CRC >> 1) ^ 0xEDB88320;
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else //0xEDB88320就是CRC-32多项表达式的值
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crc32.CRC >>= 1;
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}
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crc32.CRC_32_Tbl[i] = crc32.CRC;
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}
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CRC32 = 0xffffffff; //设置初始值
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for( i = 0; i < length; ++i)
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{
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CRC32 = crc32.CRC_32_Tbl[(CRC32^((unsigned char*)buffer)[i]) & 0xff] ^ (CRC32>>8);
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}
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//return CRC32;
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return CRC32^0xffffffff;
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}
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int main (int argc, char **argv)
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{
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char *nand = "/dev/nand";
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const char *cmd = argv[0];
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int fd;
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int force = 0; // force write even if magics and CRCs don't match
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argc--;
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argv++;
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if (argc > 1) {
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if (!strcmp(argv[0], "-f")) {
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if (!strcasecmp(argv[1], "a64"))
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force = 64;
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else {
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usage(cmd);
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return -1;
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}
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argc -= 2;
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argv += 2;
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}
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}
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if (argc > 0) {
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nand = argv[0];
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argc--;
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argv++;
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}
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fd = open(nand, O_RDWR);
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if (fd < 0) {
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fprintf(stderr, "failed to open %s: %s\n", nand, strerror(errno));
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usage(cmd);
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return -2;
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}
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if (force == 64)
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return nand_part_a64 (argc, argv, cmd, fd, force);
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if (checkmbrs_a64(fd))
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return nand_part_a64 (argc, argv, cmd, fd, force);
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return -1;
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}
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