diff options
author | juhosg <juhosg@3c298f89-4303-0410-b956-a3cf2f4a3e73> | 2007-10-10 18:05:48 +0000 |
---|---|---|
committer | juhosg <juhosg@3c298f89-4303-0410-b956-a3cf2f4a3e73> | 2007-10-10 18:05:48 +0000 |
commit | b78fbb9510cb5f9b682ffa1e59249f1c3429ea34 (patch) | |
tree | 35d1b80970bc9582e6bdbd7d0a3abecc81dda981 /target/linux/generic-2.6/files/fs/yaffs2/yaffs_ecc.h | |
parent | 76d4ca5d5056998ade5e27262b640d9bbad0d72d (diff) |
[kernel] dissect yaffs patch
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@9249 3c298f89-4303-0410-b956-a3cf2f4a3e73
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 |