diff --git a/components/dfs/dfs_config.h b/components/dfs/dfs_config.h
deleted file mode 100644
index 1681737121cc9f9c7ae516a15c37e2e32c43879f..0000000000000000000000000000000000000000
--- a/components/dfs/dfs_config.h
+++ /dev/null
@@ -1,43 +0,0 @@
-/*
-+------------------------------------------------------------------------------
-| Project   : Device Filesystem
-+------------------------------------------------------------------------------
-| Copyright 2004, 2005  www.fayfayspace.org.
-| All rights reserved.
-|------------------------------------------------------------------------------
-| File      : dfs_opts.h, the option definitions of Device FileSystem
-|------------------------------------------------------------------------------
-| Chang Logs:
-| Date           Author       Notes
-| 2005-01-22     ffxz         The first version.
-+------------------------------------------------------------------------------
-*/
-
-#ifndef __DFS_CONFIG_H__
-#define __DFS_CONFIG_H__
-
-/* the max type of filesystem */
-#define DFS_FILESYSTEM_TYPES_MAX	4
-
-/* the max length of path name */
-#define DFS_PATH_MAX				256
-
-/* the size of sector */
-#define SECTOR_SIZE					512
-
-#define DFS_DEBUG_INFO				0x01
-#define DFS_DEBUG_WARNING			0x02
-#define DFS_DEBUG_ERROR				0x04
-#define DFS_DEBUG_LEVEL				(DFS_DEBUG_INFO | DFS_DEBUG_WARNING | DFS_DEBUG_ERROR)
-
-/* #define DFS_DEBUG */
-#ifdef DFS_DEBUG
-#define dfs_log(level, x)		do { if (level & DFS_DEBUG_LEVEL) 	\
-	{rt_kprintf("DFS %s, %d:", __FUNCTION__, __LINE__); rt_kprintf x;	\
-	rt_kprintf ("\n");}}while (0)
-#else
-#define dfs_log(level, x)
-#endif
-
-#endif
-
diff --git a/components/dfs/include/dfs_def.h b/components/dfs/include/dfs_def.h
index ae1101f47f3a9ac543fa1eaffac39910bbf5fac0..fed58ac01afc85f89df9541ddea1d977acd2b6a6 100644
--- a/components/dfs/include/dfs_def.h
+++ b/components/dfs/include/dfs_def.h
@@ -17,7 +17,6 @@
 #define __DFS_DEF_H__
 
 #include <rtthread.h>
-#include <dfs_config.h>
 
 #ifndef __D_FS__
 #define __D_FS__
@@ -34,6 +33,32 @@
 #define DFS_F_EOF			0x04000000
 #define DFS_F_ERR			0x08000000
 
+#ifndef DFS_PATH_MAX
+#define DFS_PATH_MAX 			256
+#endif
+
+#ifndef SECTOR_SIZE
+#define SECTOR_SIZE				512
+#endif
+
+#ifndef DFS_FILESYSTEM_TYPES_MAX
+#define DFS_FILESYSTEM_TYPES_MAX	4
+#endif
+
+#define DFS_DEBUG_INFO				0x01
+#define DFS_DEBUG_WARNING			0x02
+#define DFS_DEBUG_ERROR				0x04
+#define DFS_DEBUG_LEVEL				(DFS_DEBUG_INFO | DFS_DEBUG_WARNING | DFS_DEBUG_ERROR)
+
+/* #define DFS_DEBUG */
+#ifdef DFS_DEBUG
+#define dfs_log(level, x)		do { if (level & DFS_DEBUG_LEVEL) 	\
+	{rt_kprintf("DFS %s, %d:", __FUNCTION__, __LINE__); rt_kprintf x;	\
+	rt_kprintf ("\n");}}while (0)
+#else
+#define dfs_log(level, x)
+#endif
+
 #if defined(RT_USING_NEWLIB) 
 #include <string.h>
 #include <sys/stat.h> 			/* used for struct stat 	*/
@@ -165,17 +190,17 @@
 #define DFS_F_EOF			0x04000000
 #define DFS_F_ERR			0x08000000
 
-/* Seek flags */
-#ifdef __CC_ARM
-#include <stdio.h>
-#define DFS_SEEK_SET		SEEK_SET
-#define DFS_SEEK_CUR		SEEK_CUR
-#define DFS_SEEK_END		SEEK_END
+/* Seek flags */
+#ifdef __CC_ARM
+#include <stdio.h>
+#define DFS_SEEK_SET		SEEK_SET
+#define DFS_SEEK_CUR		SEEK_CUR
+#define DFS_SEEK_END		SEEK_END
 #else
 #define DFS_SEEK_SET         0
 #define DFS_SEEK_CUR         1
 #define DFS_SEEK_END         2
-#endif
+#endif
 
 /* Stat codes */
 #define DFS_S_IFMT		00170000
diff --git a/components/dfs/include/dfs_fs.h b/components/dfs/include/dfs_fs.h
index d698df429b7fcca3b0cbb91a9696bad13f8c786b..b04de24f0b23eb746844d85c5c62cfbaeadcc80d 100644
--- a/components/dfs/include/dfs_fs.h
+++ b/components/dfs/include/dfs_fs.h
@@ -15,7 +15,6 @@
 #define __DFS_FS_H__
 
 #include <dfs_def.h>
-#include <dfs_config.h>
 
 /* Pre-declaration */
 struct dfs_filesystem;
diff --git a/components/dfs/src/dfs.c b/components/dfs/src/dfs.c
index 5888b8ad0b685f4aa5abbac8bd1877ba48252ce2..18eb41bf10a0b158431e038ad54187ef38b60aa5 100644
--- a/components/dfs/src/dfs.c
+++ b/components/dfs/src/dfs.c
@@ -15,7 +15,6 @@
 
 #include <dfs.h>
 #include <dfs_fs.h>
-#include <dfs_config.h>
 #include <dfs_file.h>
 
 #define NO_WORKING_DIR	"system does not support working dir\n"
diff --git a/components/dfs/src/dfs_fs.c b/components/dfs/src/dfs_fs.c
index 2d1959c9459c07c70166b7039bd0d62c68e40ed7..3a04a05f2832fa0a5b958dc798901ed8002f8a01 100644
--- a/components/dfs/src/dfs_fs.c
+++ b/components/dfs/src/dfs_fs.c
@@ -11,6 +11,7 @@
  * Date           Author       Notes
  * 2005-02-22     Bernard      The first version.
  * 2010-06-30     Bernard      Optimize for RT-Thread RTOS
+ * 2011-03-12     Bernard      fix the filesystem lookup issue.
  */
 #include <dfs_fs.h>
 #include <dfs_file.h>
@@ -86,7 +87,7 @@ struct dfs_filesystem* dfs_filesystem_lookup(const char *path)
 	dfs_lock();
 
     /* lookup it in the filesystem table */
-    for (index = 0; index < DFS_FILESYSTEMS_MAX + 1; index++)
+    for (index = 0; index < DFS_FILESYSTEMS_MAX; index++)
     {
 		if (filesystem_table[index].path == RT_NULL) continue;
 		else