Tino 
I try to run a buildroot based image with current mainline kernel since everything except the EMAC driver is merged to mainline. Since the Air doesn't have ethernet this should be fine. Unfortunatly I can not get Wifi working. It doesn't even show up in lshw etc. I compiled brcmfmac driver into the kernel and added the ap6212 firmware from https://github.com/jrspruitt/FriendlyARM_NanoPi_Buildroot_Ext. It seems that the kernel doesnt recognize the device at all, dbus for example doesnt load the brcmfmac module automatically. Is there some wakup gpio magic needed to get this working? I searched the ubuntu core image for a while but can not find anything. Please reply if somebody got information. I hope the guys who builded the ubuntu core image could tell me how they managed it. If I will succed, I will create a wiki page about the process, I think a complete mainline based OS would be a big bonus in terms of attractivity ;) With kind regards, Tino