It sounds like what you actually want is a simple BSP package for the 4DSP board you bought, with simple busses to the data channels, and a register interface for the controls. 4DSP does not really provide this. They instead provide a package based on Stellar IP. You can take the output of the stellar IP, which is a VHDL design and project for Xilinx software, and modify it to your liking. This is a fairly hard process that will require expertise with FPGA design, and is not for the faint of heart. While 4DSP claim that everything is provided to do this, I have found that there are several NGC files that prevent you from seeing the whole design. There is little to no documentation for the functionality, so you have to read there code and figure out what they are doing. You may also need to read there C code to figure out what you need to do to initialize your design. With all those caveats, it looks like the sip_FMC_204 contains the part of the code that you want to start with. Hope this helps.
From the software perspective there are two areas that the software initializes: