/boot/extlinux/extlinux.conf (Archlinux on Olinuxino A20)

TIMEOUT 100
DEFAULT archlinux
MENU TITLE Boot menu

LABEL archlinux
	MENU LABEL Archlinux
	KERNEL /zImage
	FDT /dtbs/sun7i-a20-olinuxino-lime2.dtb
	APPEND console=ttyS0,115200 root=dev/mmcblk0p2 rootfstype=btrfs rootflags=compress=lzo,discard,subvol=/archlinux rw rootwait
	INITRD /initramfs-linux.img

LABEL exit
	MENU LABEL Local boot script (boot.scr)
        LOCALBOOT 1