diff --git a/common/hw-gfx-gma-port_detect.ads b/common/hw-gfx-gma-port_detect.ads
new file mode 100644
index 0000000..848d7ab
--- /dev/null
+++ b/common/hw-gfx-gma-port_detect.ads
@@ -0,0 +1,20 @@
+--
+-- Copyright (C) 2016 secunet Security Networks AG
+--
+-- This program is free software; you can redistribute it and/or modify
+-- it under the terms of the GNU General Public License as published by
+-- the Free Software Foundation; version 2 of the License.
+--
+-- This program is distributed in the hope that it will be useful,
+-- but WITHOUT ANY WARRANTY; without even the implied warranty of
+-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+-- GNU General Public License for more details.
+--
+
+private package HW.GFX.GMA.Port_Detect is
+
+   procedure Initialize;
+
+   procedure Hotplug_Detect (Port_Cfg : in Port_Config; Detected : out Boolean);
+
+end HW.GFX.GMA.Port_Detect;