The Option ROM launch is controlled at the PCI Slot level, and is enabled by default. In configurations that consist of a large number of network controllers and storage HBAs having Option ROMs, all the Option ROMs may get launched if the PCI Slot Option ROM Control is enabled for all. However, only a subset of controllers may be used in the boot process. When this token is enabled, Option ROMs are launched only for those controllers that are present in boot policy.
Cut Cisco UCS M5 boot time with BIOS tokens: Adaptive Memory Training, OptionROM Launch Optimization, BIOS Techlog Level. Values, defaults, results.