This framework is not ready to be used to verify RISC-V compliant cores at the time of writing. Instructions for running the framework against such a core will be added once the framework is ready for use.
Support for the RV32I base ISA and RV32M extension are planned and well underway. Support for other ISAs in the original riscv-formal such as RV32C and their 64-bit counterparts may also be added in the future as time permits.