diff --git a/common/hw-gfx-gma-pch-fdi.ads b/common/hw-gfx-gma-pch-fdi.ads
new file mode 100644
index 0000000..1de78d5
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+++ b/common/hw-gfx-gma-pch-fdi.ads
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+--
+-- Copyright (C) 2015-2016 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.
+--
+
+package HW.GFX.GMA.PCH.FDI is
+
+   type Training_Pattern is (TP_1, TP_2, TP_Idle, TP_None);
+
+   procedure Pre_Train (Port : PCH.FDI_Port_Type; Port_Cfg : Port_Config);
+   procedure Train
+     (Port     : in     PCH.FDI_Port_Type;
+      TP       : in     Training_Pattern;
+      Success  :    out Boolean);
+   procedure Auto_Train (Port : PCH.FDI_Port_Type);
+   procedure Enable_EC (Port : PCH.FDI_Port_Type);
+
+   type Off_Type is (Rx_Off, Lanes_Off, Clock_Off);
+   procedure Off (Port : PCH.FDI_Port_Type; OT : Off_Type);
+
+end HW.GFX.GMA.PCH.FDI;