For those folks interested in building their own version of linux for these prototype boards, Digilent provides a pdf (https://www.digilentinc.com/Data/Produc ... _Guide.pdf) which explains the entire process. This includes building the kernel (https://github.com/Digilent/linux-digilent) which contains custom drivers for the onboard peripherals and attachable Pmods for the ZedBoard. Support for the Epiphany daughter card will be provided, once Adapteva releases the necessary documention and associated sources.
The prototype boards currently ship with an Ubuntu Desktop version of Linaro.org (http://www.linaro.org), but I plan on building a developer version on a second SD card, since I will eventually run this board headless and will have no need for a GUI. Right now, I am still running a GUI, but with only 512MB of RAM on these prototype boards, I decided to replace Gnome with DWM, since it is considerably more lightweight.