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author | Felix Fietkau <nbd@openwrt.org> | 2008-10-18 21:43:30 +0000 |
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committer | Felix Fietkau <nbd@openwrt.org> | 2008-10-18 21:43:30 +0000 |
commit | 1e570a9288856bcd288a80115f2233c9c785706c (patch) | |
tree | 8491af08bde47e22f96c01e6f560206b3fd02a4a /target/linux/generic-2.6/files-2.6.23/fs/yaffs2/yaffs_ecc.h | |
parent | 487c622ac0c37f3cd26add56df9081ea7caf3835 (diff) | |
download | upstream-1e570a9288856bcd288a80115f2233c9c785706c.tar.gz upstream-1e570a9288856bcd288a80115f2233c9c785706c.tar.bz2 upstream-1e570a9288856bcd288a80115f2233c9c785706c.zip |
change the way ./files* and the generic kernel files are applied. ./files now applies to *ALL* kernel versions, and is copied along with ./files-* - this gets rid of quite a bit of redundancy in the extra kernel drivers.
SVN-Revision: 13010
Diffstat (limited to 'target/linux/generic-2.6/files-2.6.23/fs/yaffs2/yaffs_ecc.h')
-rw-r--r-- | target/linux/generic-2.6/files-2.6.23/fs/yaffs2/yaffs_ecc.h | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/target/linux/generic-2.6/files-2.6.23/fs/yaffs2/yaffs_ecc.h b/target/linux/generic-2.6/files-2.6.23/fs/yaffs2/yaffs_ecc.h new file mode 100644 index 0000000000..79bc3d1171 --- /dev/null +++ b/target/linux/generic-2.6/files-2.6.23/fs/yaffs2/yaffs_ecc.h @@ -0,0 +1,44 @@ +/* + * YAFFS: Yet another Flash File System . A NAND-flash specific file system. + * + * Copyright (C) 2002-2007 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__ + +typedef struct { + unsigned char colParity; + unsigned lineParity; + unsigned lineParityPrime; +} yaffs_ECCOther; + +void yaffs_ECCCalculate(const unsigned char *data, unsigned char *ecc); +int yaffs_ECCCorrect(unsigned char *data, unsigned char *read_ecc, + const unsigned char *test_ecc); + +void yaffs_ECCCalculateOther(const unsigned char *data, unsigned nBytes, + yaffs_ECCOther * ecc); +int yaffs_ECCCorrectOther(unsigned char *data, unsigned nBytes, + yaffs_ECCOther * read_ecc, + const yaffs_ECCOther * test_ecc); +#endif |