config DRIVERS_MC146818
	bool
	default y if ARCH_X86
	depends on PC80_SYSTEM

config USE_PC_CMOS_ALTCENTURY
	bool "Use legacy-BIOS alt-century byte in CMOS"
	default y if !USE_OPTION_TABLE
	depends on DRIVERS_MC146818
	help
	  May be useful for legacy OSes that assume its presence.