SVN-Revision: 16458master
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/*
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* calculate ecc code for nand flash |
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* |
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* Copyright (C) 2008 yajin <yajin@vm-kernel.org> |
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* Copyright (C) 2009 Felix Fietkau <nbd@openwrt.org> |
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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 or |
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* (at your option) version 3 of the License. |
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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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#include <sys/types.h> |
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#include <sys/stat.h> |
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#include <unistd.h> |
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#include <stdlib.h> |
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#include <stdint.h> |
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#include <fcntl.h> |
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#include <stdio.h> |
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#define DEF_NAND_PAGE_SIZE 2048 |
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#define DEF_NAND_OOB_SIZE 64 |
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#define DEF_NAND_ECC_OFFSET 0x28 |
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static int page_size = DEF_NAND_PAGE_SIZE; |
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static int oob_size = DEF_NAND_OOB_SIZE; |
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static int ecc_offset = DEF_NAND_ECC_OFFSET; |
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/*
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* Pre-calculated 256-way 1 byte column parity |
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*/ |
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static const uint8_t nand_ecc_precalc_table[] = { |
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0x00, 0x55, 0x56, 0x03, 0x59, 0x0c, 0x0f, 0x5a, 0x5a, 0x0f, 0x0c, 0x59, 0x03, 0x56, 0x55, 0x00, |
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0x65, 0x30, 0x33, 0x66, 0x3c, 0x69, 0x6a, 0x3f, 0x3f, 0x6a, 0x69, 0x3c, 0x66, 0x33, 0x30, 0x65, |
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0x66, 0x33, 0x30, 0x65, 0x3f, 0x6a, 0x69, 0x3c, 0x3c, 0x69, 0x6a, 0x3f, 0x65, 0x30, 0x33, 0x66, |
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0x03, 0x56, 0x55, 0x00, 0x5a, 0x0f, 0x0c, 0x59, 0x59, 0x0c, 0x0f, 0x5a, 0x00, 0x55, 0x56, 0x03, |
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0x69, 0x3c, 0x3f, 0x6a, 0x30, 0x65, 0x66, 0x33, 0x33, 0x66, 0x65, 0x30, 0x6a, 0x3f, 0x3c, 0x69, |
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0x0c, 0x59, 0x5a, 0x0f, 0x55, 0x00, 0x03, 0x56, 0x56, 0x03, 0x00, 0x55, 0x0f, 0x5a, 0x59, 0x0c, |
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0x0f, 0x5a, 0x59, 0x0c, 0x56, 0x03, 0x00, 0x55, 0x55, 0x00, 0x03, 0x56, 0x0c, 0x59, 0x5a, 0x0f, |
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0x6a, 0x3f, 0x3c, 0x69, 0x33, 0x66, 0x65, 0x30, 0x30, 0x65, 0x66, 0x33, 0x69, 0x3c, 0x3f, 0x6a, |
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0x6a, 0x3f, 0x3c, 0x69, 0x33, 0x66, 0x65, 0x30, 0x30, 0x65, 0x66, 0x33, 0x69, 0x3c, 0x3f, 0x6a, |
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0x0f, 0x5a, 0x59, 0x0c, 0x56, 0x03, 0x00, 0x55, 0x55, 0x00, 0x03, 0x56, 0x0c, 0x59, 0x5a, 0x0f, |
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0x0c, 0x59, 0x5a, 0x0f, 0x55, 0x00, 0x03, 0x56, 0x56, 0x03, 0x00, 0x55, 0x0f, 0x5a, 0x59, 0x0c, |
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0x69, 0x3c, 0x3f, 0x6a, 0x30, 0x65, 0x66, 0x33, 0x33, 0x66, 0x65, 0x30, 0x6a, 0x3f, 0x3c, 0x69, |
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0x03, 0x56, 0x55, 0x00, 0x5a, 0x0f, 0x0c, 0x59, 0x59, 0x0c, 0x0f, 0x5a, 0x00, 0x55, 0x56, 0x03, |
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0x66, 0x33, 0x30, 0x65, 0x3f, 0x6a, 0x69, 0x3c, 0x3c, 0x69, 0x6a, 0x3f, 0x65, 0x30, 0x33, 0x66, |
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0x65, 0x30, 0x33, 0x66, 0x3c, 0x69, 0x6a, 0x3f, 0x3f, 0x6a, 0x69, 0x3c, 0x66, 0x33, 0x30, 0x65, |
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0x00, 0x55, 0x56, 0x03, 0x59, 0x0c, 0x0f, 0x5a, 0x5a, 0x0f, 0x0c, 0x59, 0x03, 0x56, 0x55, 0x00 |
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}; |
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/**
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* nand_calculate_ecc - [NAND Interface] Calculate 3-byte ECC for 256-byte block |
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* @dat: raw data |
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* @ecc_code: buffer for ECC |
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*/ |
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int nand_calculate_ecc(const uint8_t *dat, |
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uint8_t *ecc_code) |
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{ |
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uint8_t idx, reg1, reg2, reg3, tmp1, tmp2; |
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int i; |
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/* Initialize variables */ |
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reg1 = reg2 = reg3 = 0; |
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/* Build up column parity */ |
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for(i = 0; i < 256; i++) { |
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/* Get CP0 - CP5 from table */ |
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idx = nand_ecc_precalc_table[*dat++]; |
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reg1 ^= (idx & 0x3f); |
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/* All bit XOR = 1 ? */ |
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if (idx & 0x40) { |
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reg3 ^= (uint8_t) i; |
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reg2 ^= ~((uint8_t) i); |
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} |
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} |
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/* Create non-inverted ECC code from line parity */ |
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tmp1 = (reg3 & 0x80) >> 0; /* B7 -> B7 */ |
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tmp1 |= (reg2 & 0x80) >> 1; /* B7 -> B6 */ |
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tmp1 |= (reg3 & 0x40) >> 1; /* B6 -> B5 */ |
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tmp1 |= (reg2 & 0x40) >> 2; /* B6 -> B4 */ |
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tmp1 |= (reg3 & 0x20) >> 2; /* B5 -> B3 */ |
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tmp1 |= (reg2 & 0x20) >> 3; /* B5 -> B2 */ |
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tmp1 |= (reg3 & 0x10) >> 3; /* B4 -> B1 */ |
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tmp1 |= (reg2 & 0x10) >> 4; /* B4 -> B0 */ |
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tmp2 = (reg3 & 0x08) << 4; /* B3 -> B7 */ |
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tmp2 |= (reg2 & 0x08) << 3; /* B3 -> B6 */ |
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tmp2 |= (reg3 & 0x04) << 3; /* B2 -> B5 */ |
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tmp2 |= (reg2 & 0x04) << 2; /* B2 -> B4 */ |
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tmp2 |= (reg3 & 0x02) << 2; /* B1 -> B3 */ |
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tmp2 |= (reg2 & 0x02) << 1; /* B1 -> B2 */ |
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tmp2 |= (reg3 & 0x01) << 1; /* B0 -> B1 */ |
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tmp2 |= (reg2 & 0x01) << 0; /* B7 -> B0 */ |
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/* Calculate final ECC code */ |
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#ifdef CONFIG_MTD_NAND_ECC_SMC |
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ecc_code[0] = ~tmp2; |
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ecc_code[1] = ~tmp1; |
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#else |
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ecc_code[0] = ~tmp1; |
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ecc_code[1] = ~tmp2; |
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#endif |
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ecc_code[2] = ((~reg1) << 2) | 0x03; |
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return 0; |
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} |
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/*
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* usage: bb-nandflash-ecc start_address size |
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*/ |
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void usage(const char *prog) |
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{ |
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fprintf(stderr, "Usage: %s [options] <input> <output>\n" |
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"Options:\n" |
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" -p <pagesize> NAND page size (default: %d)\n" |
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" -o <oobsize> NAND OOB size (default: %d)\n" |
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" -e <offset> NAND ECC offset (default: %d)\n" |
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"\n", prog, DEF_NAND_PAGE_SIZE, DEF_NAND_OOB_SIZE, |
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DEF_NAND_ECC_OFFSET); |
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exit(1); |
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} |
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/*start_address/size does not include oob
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*/ |
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int main(int argc, char **argv) |
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{ |
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uint8_t *page_data = NULL; |
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uint8_t *ecc_data; |
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int infd = -1, outfd = -1; |
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int ret = 1; |
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ssize_t bytes; |
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int ch; |
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while ((ch = getopt(argc, argv, "e:o:p:")) != -1) { |
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switch(ch) { |
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case 'p': |
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page_size = strtoul(optarg, NULL, 0); |
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break; |
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case 'o': |
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oob_size = strtoul(optarg, NULL, 0); |
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break; |
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case 'e': |
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ecc_offset = strtoul(optarg, NULL, 0); |
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break; |
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default: |
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usage(argv[0]); |
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} |
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} |
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argc -= optind; |
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if (argc < 2) |
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usage(argv[0]); |
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argv += optind; |
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infd = open(argv[0], O_RDONLY, 0); |
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if (infd < 0) { |
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perror("open input file"); |
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goto out; |
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} |
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outfd = open(argv[1], O_WRONLY|O_CREAT|O_TRUNC, 0644); |
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if (outfd < 0) { |
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perror("open output file"); |
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goto out; |
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} |
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page_data = malloc(page_size + oob_size); |
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while ((bytes = read(infd, page_data, page_size)) == page_size) { |
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int j; |
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ecc_data = page_data + page_size + ecc_offset; |
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for (j = 0; j < page_size / 256; j++) |
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{ |
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nand_calculate_ecc(page_data + j * 256, ecc_data); |
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ecc_data += 3; |
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} |
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write(outfd, page_data, page_size + oob_size); |
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} |
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ret = 0; |
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out: |
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if (infd >= 0) |
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close(infd); |
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if (outfd >= 0) |
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close(outfd); |
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if (page_data) |
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free(page_data); |
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return ret; |
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} |
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