Hi there!
I got my wandboard dual up and running by following the instructions here:
http://www.eewiki.net/display/linuxonarm/WandboardJust follow the steps for "Bootloader", "Linux Kernel" and "Setup microSD card" to the point.
For the rootfs, I used the official Arch root for the Nitrogen6X, which seems to be quite similar to the wandboard. Works like a charm, so far.
edit: forgot to mention, the default kernel config has all the cgroups stuff and autofs4 disabled. You have to enable it, when the menuconfig pops up. Otherwise systemd will go bonkers.