I don't believe chip select at the socket works as you'd expect (post kickstart initialization) unless you cut a few traces on the board; some of which may not work correctly anyway after modifying the daughter board to bypass the WCS.
It's been a while since I created these and will have to find the sources, as they were made on a previous Linux install. Note that a few users here have recreated this board with improvements (ie. more kickstarts and a flood filled ground plane) that provided sources in the hardware sub-forum.
If I can dig these up, I'll have them posted on Github.