+ ///\r
+ /// Pointer to a GUID identifying the device connected to the serial port.\r
+ /// This field is NULL when the protocol is installed by the serial port\r
+ /// driver and may be populated by a platform driver for a serial port\r
+ /// with a known device attached. The field will remain NULL if there is\r
+ /// no platform serial device identification information available.\r
+ ///\r
+ CONST EFI_GUID *DeviceTypeGuid; // Revision 1.1\r