Clarification: BFGMiner's "littlefury" branch (which should really be renamed "bitfury", and probably will be at some point) is currently tested with LittleFury and generic GPIO only, and should also work with Metabank's rigs, but is still strictly a work-in-progress and not considered a stable or even testing release. I haven't confirmed yet that it is compatible with the board design referenced in the OP, but if not I certainly plan to port it ASAP.