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author | Gabor Juhos <juhosg@openwrt.org> | 2007-10-10 18:05:48 +0000 |
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committer | Gabor Juhos <juhosg@openwrt.org> | 2007-10-10 18:05:48 +0000 |
commit | 1defe9a10c0dda340c3995cdb8e50efe1ff29821 (patch) | |
tree | c6e5b61be7449300bd68a9e38c15c966ac2224bc /target/linux/generic-2.6/files/fs/yaffs2/yaffs_ecc.h | |
parent | 2dd2d40b59c4e760e67eef0607270e671ff0c2bd (diff) | |
download | upstream-1defe9a10c0dda340c3995cdb8e50efe1ff29821.tar.gz upstream-1defe9a10c0dda340c3995cdb8e50efe1ff29821.tar.bz2 upstream-1defe9a10c0dda340c3995cdb8e50efe1ff29821.zip |
dissect yaffs patch
SVN-Revision: 9249
Diffstat (limited to 'target/linux/generic-2.6/files/fs/yaffs2/yaffs_ecc.h')
-rw-r--r-- | target/linux/generic-2.6/files/fs/yaffs2/yaffs_ecc.h | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/target/linux/generic-2.6/files/fs/yaffs2/yaffs_ecc.h b/target/linux/generic-2.6/files/fs/yaffs2/yaffs_ecc.h new file mode 100644 index 0000000000..40fd02b965 --- /dev/null +++ b/target/linux/generic-2.6/files/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 |