7e3644d3cf
Use the latest version of the yaffs code. Fetched from the
yaffs2 git tree and it is based on the following commit:
commit bc76682d93955cfb33051beb503ad9f8a5450578
Merge: 3a8580e ffa781d
Author: Charles Manning <cdhmanning@gmail.com>
Date: Thu Jul 11 17:46:25 2013 +1200
Merge branch 'master' of ssh://www.aleph1.co.uk/home/aleph1/git/yaffs2
Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
SVN-Revision: 39084
45 lines
1.4 KiB
C
45 lines
1.4 KiB
C
/*
|
|
* YAFFS: Yet another Flash File System . A NAND-flash specific file system.
|
|
*
|
|
* Copyright (C) 2002-2011 Aleph One Ltd.
|
|
* for Toby Churchill Ltd and Brightstar Engineering
|
|
*
|
|
* Created by Charles Manning <charles@aleph1.co.uk>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU Lesser General Public License version 2.1 as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
|
|
*/
|
|
|
|
/*
|
|
* This code implements the ECC algorithm used in SmartMedia.
|
|
*
|
|
* The ECC comprises 22 bits of parity information and is stuffed into 3 bytes.
|
|
* The two unused bit are set to 1.
|
|
* The ECC can correct single bit errors in a 256-byte page of data.
|
|
* Thus, two such ECC blocks are used on a 512-byte NAND page.
|
|
*
|
|
*/
|
|
|
|
#ifndef __YAFFS_ECC_H__
|
|
#define __YAFFS_ECC_H__
|
|
|
|
struct yaffs_ecc_other {
|
|
unsigned char col_parity;
|
|
unsigned line_parity;
|
|
unsigned line_parity_prime;
|
|
};
|
|
|
|
void yaffs_ecc_calc(const unsigned char *data, unsigned char *ecc);
|
|
int yaffs_ecc_correct(unsigned char *data, unsigned char *read_ecc,
|
|
const unsigned char *test_ecc);
|
|
|
|
void yaffs_ecc_calc_other(const unsigned char *data, unsigned n_bytes,
|
|
struct yaffs_ecc_other *ecc);
|
|
int yaffs_ecc_correct_other(unsigned char *data, unsigned n_bytes,
|
|
struct yaffs_ecc_other *read_ecc,
|
|
const struct yaffs_ecc_other *test_ecc);
|
|
#endif
|