close uffs since the nand driver is not okay yet.

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@2555 bbd45198-f89e-11dd-88c7-29a3b14d5316

bsp/simulator/rtconfig.h

@@ -121,7 +121,7 @@
 #define RT_USING_DFS_NFS
 
 /* DFS: uffs nand file system options */
-#define RT_USING_DFS_UFFS
+/* #define RT_USING_DFS_UFFS */
 /* configuration for uffs, more to see dfs_uffs.h and uffs_config.h */
 /* use ecc soft, the uffs will do all the things about ecc */
 #define RT_CONFIG_UFFS_ECC_MODE  UFFS_ECC_SOFT