Updated the CuBox-i4Pro to Kernel 4.2 (from kernel.org) and everything went smoothly – eventually..

I had tried using the kernel config saved from 4.1, but after booting successfully, the network suddenly stopped working after a few minutes of traffic, even though eth0 etc. was still present..     I was planning to revert to 4.1.6, but then tried creating a fresh config using # make imx_v6_v7_defconfig, and recompiling, and everything seems to be OK now..

Fedora release 22 (Twenty Two)
Kernel 4.2.0 on an armv7l (ttymxc0)
..............
$ uname -a
Linux rgcubox 4.2.0 #1 SMP Tue Sep 8 13:59:08 EDT 2015 armv7l armv7l armv7l GNU/Linux

Robert Gadsdon.  September 8th, 2015.