diff --git a/MdePkg/Include/Library/SerialPortLib.h b/MdePkg/Include/Library/SerialPortLib.h
index dc4031a974..59c5c27e3f 100644
--- a/MdePkg/Include/Library/SerialPortLib.h
+++ b/MdePkg/Include/Library/SerialPortLib.h
@@ -70,5 +70,21 @@ SerialPortRead (
   IN  UINTN 	NumberOfBytes
   );
 
+/**
+  Poll the serial device to see if there is any data waiting.
+
+  If there is data waiting to be read from the serial port, then return
+  TRUE.  If there is no data waiting to be read from the serial port, then 
+  return FALSE.
+
+  @retval TRUE             Data is waiting to be read.
+  @retval FALSE            There is no data waiting to be read.
+
+**/
+BOOLEAN
+EFIAPI
+SerialPortPoll (
+  VOID
+  );
 
 #endif
diff --git a/MdePkg/Library/SerialPortLibNull/SerialPortLibNull.c b/MdePkg/Library/SerialPortLibNull/SerialPortLibNull.c
index 1fdc6586a5..fa256facc7 100644
--- a/MdePkg/Library/SerialPortLibNull/SerialPortLibNull.c
+++ b/MdePkg/Library/SerialPortLibNull/SerialPortLibNull.c
@@ -73,3 +73,23 @@ SerialPortRead (
   return 0;
 }
 
+/**
+  Poll the serial device to see if there is any data waiting.
+
+  If there is data waiting to be read from the serial port, then return
+  TRUE.  If there is no data waiting to be read from the serial port, then 
+  return FALSE.
+
+  @retval FALSE            There is no data waiting to be read.
+
+**/
+BOOLEAN
+EFIAPI
+SerialPortPoll (
+  VOID
+  )
+{
+  return FALSE; 
+} 
+
+ 
\ No newline at end of file