At the current time THERE ARE NO BUILDS FOR ALLWINNER DEVICES released by the LibreELEC team. Please save your breath and our time by not creating "is <device> supported?" posts, because whatever the device is, it's not supported. Elsewhere on the internet there are some LE builds circulating. These appear to be based on old kernels, old drivers, old hacks for Kodi, and we don't know what else. They are nothing to do with us and we have no knowledge about who is creating them or why anything does or doesn't work in them.
The current Allwinner development effort in our GitHub repo centres on modern kernels and uboot, and will ultimately use V4L2/mem2mem decoding with GBM/DRM rendering in Kodi. Some of this work depends on future V4L2 kernel changes not scheduled to be finalised until Q2-2018-ish timeframe, and at the time of making this sticky post an interim video driver is only partially written. TL;DR: If you clone the allwinner development branch in our github repo at the moment you will not get a working image to play with. The core OS probably boots but Kodi will not run. Again, save your breath and our time and please wait patiently until there are official announcements and alpha/nightly type releases have started.