Recent versions of the Linux net-next tree could not be tested on the C2, as the meson-gx mmc driver was missing, but now it has been added, and I tested the latest version (December 17) – but the Ethernet hang is still there..      To be fair, this is probably because of the current patch conflict that has been under discussion, and I am hoping that – eventually – a known/good fix will appear here first..:  http://git.kernel.org/cgit/linux/kernel/git/davem/net-next.git

Robert Gadsdon.  December 18, 2016.