Is there any way to tell openlane to "ignore" blackboxes ? I have some blocks that just don't have implementations ATM (IOs / RAMs) and I'd just like to ignore those for now. I can't remove them from the verilog because then yosys just optimizes aways everything 😄 I declared them as blackboxes and it goes until global routing where it complains about

[ERROR] Net trans_<http://I.mc|I.mc>_opcode\[14\] has invalid sinks/source distribution

... I'd just like it to ignore that for now and just don't route those nets.