buildroot/target/device/Soekris/Config.in

config BR2_TARGET_SOEKRIS_NET4521
	bool "Soekris net4521"
	depends BR2_i386
	default n
	select BR2_PACKAGE_LINUX
	help
	  The Soekris net4521

config BR2_PACKAGE_LINUX
	bool "linux"
	default n
	help
	    The Linux kernel.

	    http://www.kernel.org/