Using io.wready leads to verilog that reads from the output...
Lint-[PCTIO-L] Ports coerced to inout
/scratch/terpstra/federation/rocket-chip/vsim/generated-src/UnitTestHarness.UnitTestConfig.v, 24860
"io_wready"
Port "io_wready" declared as output in module "RRTestCombinational_29" may
need to be inout. Coercing to inout.