Barrel - A (work in progress) parallel RISC-V application processor

The core targets RV64IAMS to reduce complexity while still being able to boot Linux.

A toolchain will need to be compiled from source, as the default extensions for RISC-V toolchains are GC, and the lp64 ABI used is not compatible with the ABI they use.

Future work may enable D & V extensions to use the DSP blocks found on most FPGAS.