Add stub for FS.FILO.Ext2
diff --git a/src/fs-filo-ext2.adb b/src/fs-filo-ext2.adb
new file mode 100644
index 0000000..df8525f
--- /dev/null
+++ b/src/fs-filo-ext2.adb
@@ -0,0 +1,28 @@
+with Interfaces;
+
+with FS.FILO.Dev;
+
+package body FS.FILO.Ext2 is
+
+   procedure Mount (Success : out Boolean)
+   is
+   begin
+      Success := False;
+   end Mount;
+
+   procedure Open (File_Path : String; Success : out Boolean)
+   is
+   begin
+      Success := False;
+   end Open;
+
+   procedure Close is null;
+
+   procedure Read (Buf : out Buffer_Type; Len : out Natural)
+   is
+   begin
+      Buf := (others => 16#00#);
+      Len := 0;
+   end Read;
+
+end FS.FILO.Ext2;