The Option ROM configuration parameter allows you to enable or disable Option ROMs. Option ROMs allow third-party hardware vendors to provide software support for their devices during the boot-up phase.
The runtime Option ROM address space is located at the physical address 0xC0000 to 0xDFFFF, for a total of 128 Kbytes of memory.
The Option ROM setup parameter allows you to ration the Option ROM address space. If a device populates in a PCI Express slot, but is not meant to be a bootable device, you can disable the Option ROM execution for the device. Similarly, if you disable expansion slots that do not contain devices, the blade will boot more quickly.