Linux/DM388: DM388 Processor Board customization

Part Number: DM388

Tool/software: Linux

I'm working on a project to stream digital video received on board, to  a different PC through Ethernet and to display the same video in an analog display. The board I selected is the DM388 Processor Board( TMDSCSK388). To study more about the same I acquired the TMDSCSK388-CSKCC-BNDL. Now I'm working on to customize the board to my required application. Where can I make the necessary changes in the Linix source files? To control my video input to the board ports and stream the same out