The BIOS Serial Console Port option provides additional selections for enabling BIOS Serial Console.
Selecting the Enable Remote option without the supported RILOE II or iLO firmware will result in an error:
The setting Enable Remote requires RILOE-II or iLO with firmware version 1.20 or greater (1.41 or greater with iLO firmware recommended). Do not use the Enable Remote setting if iLO is Disabled and RILOE-II is not installed.