Experimental BeagleBone Black Sabayon armhf images

Does this kernel support the userpace spidev driver?

I’ve no idea how to get started with the dev-tree stuff, and besides I want to just use the Beaglebone, not develop/modify system code for it. I can follow a clear recipe to patch and cross-compile a kernel, but I just don’t have the time available to do much more than that.