Each directory contains a design for a supported board:

 altera-de1

 xilinx-s3sk     Xilinx Spartan-3 Starter Board with a xc3s200 and 
                 1 mbit SRAM.

 xilinx-s3esk    Xilinx Spartan-3E Starter Kit with an xc3s500e and
                 512 mbit DDR DRAM.

 xilinx-xupv2p   
                 
 simulation      Simulation only target which can be used to simulate 
                 a programm running on soc-lm32