Add missing comments

sdk/xtklib/hl/cport.c

@@ -221,7 +221,7 @@ HlInitializeComPort(IN OUT PCPPORT Port,
         PortNumber = 1;
     }
 
-    /* We support up to COM8 */
+    /* We support only a pre-defined number of ports */
     if(PortNumber > ARRAY_SIZE(ComPortAddress))
     {
         /* Fail if wrong/unsupported port used */

xtldr/xtldr.c

@@ -63,6 +63,7 @@ BlStartXtLoader(IN EFI_HANDLE ImageHandle,
     EfiImageHandle = ImageHandle;
     EfiSystemTable = SystemTable;
 
+    /* Early initialize COM port for debugging (115200 8n1) */
     Status = HlInitializeComPort(&EfiSerialPort, 1, 0);
     if(Status != STATUS_SUCCESS)
     {