The Detailed information of any Lattice Evaluation Board, For example: Theory of Operation, Configuration and Programming, Schematic etc are available in the respective Evaluation Board User's Guide/ User's Manuals.
To get the User's Guide or User Manuals of any Lattice Evaluation Board, Here is the link or go to Lattice Website > Products > Development Kits & Boards > Evaluation Board name > Documentation > User Manual.