now i have armbian working on my tab (et-86-v2g-v1.8)
armbian image from cubieboard 2 and allwinner a33 u-boot
for video you should compile kernel your self from source with sunxi_defconfig
and for usb in /arch/arm/boot/dtbs/...
you should change otg dr_mod to host (dr_mod=host)
sorry because of my English I'm not native
(dtb : sun8i-a33-q8-tablet.dtb)