ArmPlatformPkg/Bds: Catch the key pressed to escape the count doan

Catch the pressed key used to not start the default boot device.
Otherwise this key would appear in the menu user input.



git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@11990 6f19259b-4bc3-4df7-8a09-765794883524

ArmPlatformPkg/Bds/Bds.c

@@ -269,6 +269,7 @@ StartDefaultBootOnTimeout (
   UINTN               Index;
   CHAR16              BootVariableName[9];
   EFI_STATUS           Status;
+  EFI_INPUT_KEY   Key;
 
   Size = sizeof(UINT16);
   Timeout = (UINT16)PcdGet16 (PcdPlatformBootTimeOut);
@@ -293,6 +294,10 @@ StartDefaultBootOnTimeout (
           Timeout--;
         }
       }
+      // Discard key in the buffer
+      do {
+      	Status = gST->ConIn->ReadKeyStroke (gST->ConIn, &Key);
+      } while(!EFI_ERROR(Status));
       gBS->CloseEvent (WaitList[0]);
       Print(L"\n\r");
     }