Synthesis failed on ZedBoard (riscv_ex_stage.sv)

[akurth]

I could reproduce your problem with Vivado 2020.2, so the problem is not on your side.  I have opened an issue to track this problem.

The problem does not occur in Vivado 2020.1 (and earlier), so until this problem is resolved, please use an earlier version of Vivado if you can.  If you are familiar with Vivado's IP system, especially in 2020.2, please do not hesitate to contribute your knowledge to the resolution of the problem.