WARP-V + OpenPiton

[shivampotdar]

Integration of WARP-V with OpenPiton

Google Summer of Code 2020 Project with FOSSi Foundation

-- Shivam Potdar, India

This PR aims to add support for integrating WARP-V with Bring Your Own Core (BYOC)

The following changes are made :

• Other cores which are supported in BYOC have a separate transducer module which instantiated alongside the core. With WARP-V and the flexibility that is possible, we can generate one top-level module (warpv_openpiton) to directly contain all the interface signals with the BYOC Transaction-Response Interface (TRI).
• Necessary flags and options for building for WARP-V are added in the sims,2.0, and other related files.
• Submodule for warp_v is added to the piton/design/chip/tile/warp_v/ directory. Paired with a Makefile, Verilog for the latest build of WARP-V can be generated using Sandpiper SaaS when sims runs for WARP-V.
• Currently WARP-V can be successfully built using sims and can interact with the TRI in a limited manner.