mirror of https://github.com/OpenIPC/firmware.git
48 lines
1.6 KiB
Diff
48 lines
1.6 KiB
Diff
--- linux-4.9.37/fs/yaffs2/yaffs_ecc.h 1970-01-01 03:00:00.000000000 +0300
|
|
+++ linux-4.9.y/fs/yaffs2/yaffs_ecc.h 2021-06-07 13:01:34.000000000 +0300
|
|
@@ -0,0 +1,44 @@
|
|
+/*
|
|
+ * 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
|