Serial port UARTs can be found on legacy I/O or on PCI;

By default Pc-Check UEFI will look for serial UARTs at these four standard legacy I/O addresses; 3f8h, 2f8h, 3e8h and 2e8h

Enabling the probe option (shown below) in config.xml will cause Pc-Check UEFI to additionally look for serial UARTs at these I/O addresses; 270h, 280h, 288h, 2D0h, 2E0h, 2F0h, 328h, 3E0h, 368h, 330h, 338h, 340h, 348h, 320h, 360h and 368h

   <GROUP_4502>
       <!-- Serial Group. -->

       <!-- Probe for extra serial UARTs of industrial and point of sale systems. -->
       <Probe option="false">Probe additional legacy port locations</Probe>
   </GROUP_4502>

We don't enable this extra port probing by default as this will add unnecessarily to the program start-up time.

Pc-Check UEFI will also examine the configured I/O address space of any PCI serial port cards - identified by PCI device class 700h.

The program currently supports up to 50 serial ports.

If a serial port card has a higher default base clock, so as to achieve clock rates in excess of 115,200 baud, then Pc-Check UEFI will test at the resultant higher baud rates.