Mount of core failed to setup loop device

note that i provide nanopi-air core images since severeal monts at

feel free to simply use that one, it gets regular testing etc (i run some infrastructure here locally with it) …

the gadget code is at https://github.com/ogra1/nanopi-air-gadget and the kernel is a re-packed linux-generic ubuntu kernel (with some sunxi options and the nanopi wlan driver added)