Adding OpenWrt support for Lenovo IX4-300d

I would like to build and install openwrt for Lenovo IX4-300d device (Armada XP MV78230 SoC arm_cortex-a9_vfpv3 512Mb ram). Other than add armada-xp-lenovo-ix4-300d.dts to the target/linux/mvebu/files/arch/arm/boot/dts folder, I am not sure what to do next. Is it possible to add this nas device or point to instructions to adding a new device to the menuconfig? The device is supported in mainline linux.