@User: Magic doesn't have the concept of a black box for DRC. What I have been recommending is an "abstract view" of the core SRAM cell and the I/Os that is DRC clean. Getting the right view requires setting up the search paths to point to the right views. I need to make sure everyone has the instructions to load magic and get a clean DRC view. I'm pretty sure the Caravel repository isn't correctly set up for that now.