In Legacy BIOS Mode, I/O adapter utilities are invoked during BIOS POST progression using hot keys identified by the adapter's Option ROM during POST. When the hot key is pressed, the adapter's specific configuration utility interface is presented. Often the interface will have a vendor-specific design.
In UEFI Boot Mode, the configuration screens for the add-in cards will appear as menu items in the BIOS UEFI Driver Control Menu as part of the standard BIOS Setup Utility screens. For example, if the Oracle Sun Storage 6Gb/s SAS PCIe RAID host bus adapter is installed in the server, its configuration utility appears as a menu selection on the BIOS UEFI Driver Control Menu.