zephyr/arch/Kconfig

config ARCH
	string
	option env="ARCH"
	default "x86"
	help
	This option identifies the architecture type.
	The values supported are: x86 arm

if ARCH = "x86"
	source "arch/x86/Kconfig"
endif

if ARCH = "arm"
	source "arch/arm/Kconfig"
endif