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From: tonyg <tonythegair@gmail.com>
Newsgroups: comp.lang.ada
Subject: Re: GNAT.Serial_Communications
Date: Thu, 21 Apr 2011 03:14:23 -0700 (PDT)
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Here are the 'monkey with a spanner' changes I have done,  :o)

g-sercom.ads

   type Flow_Control is (None, Active);

   procedure Set
     (Port      : Serial_Port;
      Rate      : Data_Rate        := B9600;
      Bits      : Data_Bits        := CS8;
      Stop_Bits : Stop_Bits_Number := One;
      Parity    : Parity_Check     := None;
      Block     : Boolean          := True;
      Timeout   : Duration         := 10.0;
      Flow	: Flow_Control	   := Active);

g-sercom.adb

   C_Flow_Control : Constant array (Flow_Control) of unsigned :=
     (None => 0, Active => CRTSCTS);

   procedure Set
     (Port      : Serial_Port;
      Rate      : Data_Rate        := B9600;
      Bits      : Data_Bits        := CS8;
      Stop_Bits : Stop_Bits_Number := One;
      Parity    : Parity_Check     := None;
      Block     : Boolean          := True;
      Timeout   : Duration         := 10.0;
      Flow      : Flow_Control     := Active)


      Current.c_cflag      := C_Data_Rate (Rate)
                                or C_Bits (Bits)
                                or C_Stop_Bits (Stop_Bits)
                                or C_Parity (Parity)
                                or CLOCAL
                                or CREAD
                                or C_Flow_Control (Flow);

what do you think? I have tried to maintain compatibility.