Reference Platform for Emulating OpenCL

I'm in the process of purchasing some boards and I'd like to get started with OpenCL. The documentation states that although all I want to do is emulation (for now), I still need to install a board. I'd like to simply use a reference board platform for now. However, I've been unable to find one I can download, although the documentation states one should be available.

Can someone please point me to where I can download a reference FPGA platform board so I can install and perform some OpenCL emulation?