I have just released Yosys 0.8https://github.com/YosysHQ/yosys/releases/tag/yosys-0.8 …
Most of the issues with tristate outputs on iCE40 are packing/pnr issues, not Yosys issues. I think nextpnr should do a better job here than arachne-pnr. Not sure if nextpnr-ice40 is already available in icestudio. cc @JesusArroyo89
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Thanks a lot.
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