I would be super interested in seeing the biriscv be added to the LiteX CPU ecosystem so it could be easily compared to other options like VexRISCV / Rocket / etc. It would be easy to compare via https://antmicro.github.io/embench-tester/ (https://github.com/antmicro/embench-tester).

It would also be awesome to have another 32bit RISC-V option for https://github.com/litex-hub/linux-on-litex-vexriscv

There is some information at https://github.com/enjoy-digital/litex/wiki/Add-A-New-CPU and https://github.com/enjoy-digital/litex/wiki/CPUs