fishHEADmaster

1 files changed, 44 insertions, 0 deletions

diff --git a/target/linux/generic/files/fs/yaffs2/yaffs_ecc.h b/target/linux/generic/files/fs/yaffs2/yaffs_ecc.h
new file mode 100644
index 0000000..124e5a0
--- /dev/null
+++ b/target/linux/generic/files/fs/yaffs2/yaffs_ecc.h
@@ -0,0 +1,44 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 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_ecc_cacl(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,
+			yaffs_ECCOther *ecc);
+int yaffs_ecc_correct_other(unsigned char *data, unsigned n_bytes,
+			yaffs_ECCOther *read_ecc,
+			const yaffs_ECCOther *test_ecc);
+#endif