What message you have on /home/cb2/.xcsoar/xcsoar.log

How skysight chart is displayed on Cubieboard2 + 5.7" display + XCSoar
The new Openvario image does not support OpenGL. As a result, skysight chart can't be shown on Cubieboard2 + 5.7" display, i.e. stefly openvario hardware. I took another approach which is 1) run Armbian which Debian Xenial 16.04 LTS, 2) XCSoar 7.0 Skysight integrated. I also partially ported ovmenu. This video shows from power-on to showing skysight chart on map.