diff --git a/components/libc/Kconfig b/components/libc/Kconfig
index b2af15e841..a2b8747ef6 100644
--- a/components/libc/Kconfig
+++ b/components/libc/Kconfig
@@ -10,7 +10,6 @@ if RT_USING_LIBC
 
     config RT_LIBC_USING_FILEIO
         bool "Enable libc with file operation, eg.fopen/fwrite/fread/getchar"
-        select RT_USING_DFS
         select RT_USING_POSIX
         default n
 
@@ -37,40 +36,38 @@ config RT_LIBC_DEFAULT_TIMEZONE
     range -12 12
     default 8
 
-config RT_USING_PTHREADS
-    bool "Enable pthreads APIs"
+config RT_USING_POSIX
+    bool "Enable basic POSIX layer, open/read/write/close etc"
+    select RT_USING_DFS
+    select RT_USING_DFS_DEVFS
     default n
 
-if RT_USING_PTHREADS
-    config PTHREAD_NUM_MAX
-        int "Maximum number of pthreads"
-        default 8
-endif
+if RT_USING_POSIX
+    config RT_USING_POSIX_MMAP
+        bool "Enable mmap() API"
+        default n
 
-if RT_USING_DFS
-    config RT_USING_POSIX
-        bool "Enable POSIX layer, open/read/write/select etc"
-        select RT_USING_DFS_DEVFS
-        default y
+    config RT_USING_POSIX_TERMIOS
+        bool "Enable termios APIs"
+        default n
 
-    if RT_USING_POSIX
-        config RT_USING_POSIX_MMAP
-            bool "Enable mmap() API"
-            default n
+    config RT_USING_POSIX_GETLINE
+        bool "Enable getline()/getdelim() APIs"
+        default n
 
-        config RT_USING_POSIX_TERMIOS
-            bool "Enable termios APIs"
-            default n
+    config RT_USING_POSIX_AIO
+        bool "Enable AIO"
+        default n
 
-        config RT_USING_POSIX_GETLINE
-            bool "Enable getline()/getdelim() APIs"
-            default n
+    config RT_USING_PTHREADS
+        bool "Enable pthreads APIs"
+        default n
 
-        config RT_USING_POSIX_AIO
-            bool "Enable AIO"
-            default n
+    if RT_USING_PTHREADS
+        config PTHREAD_NUM_MAX
+            int "Maximum number of pthreads"
+            default 8
     endif
-
 endif
 
 endmenu
diff --git a/components/net/Kconfig b/components/net/Kconfig
index 0fede3eb90..4c49f4aa97 100644
--- a/components/net/Kconfig
+++ b/components/net/Kconfig
@@ -41,9 +41,7 @@ config RT_USING_SAL
         config SAL_USING_POSIX
             bool "Enable BSD socket operated by file system API"
             default n
-            select RT_USING_DFS
-            select RT_USING_LIBC
-            select RT_USING_POSIX
+            select RT_LIBC_USING_FILEIO
             help
                 Let BSD socket operated by file system API, such as read/write and involveed in select/poll POSIX APIs.