ok, I'm utterly failing at driving a line.  It's connected to a saleae only, so there isn't something force-driving to ground.

I have: m.submodules.dataout_buffer = dataout = io.Buffer("o", self._ports.datao)
and:         m.d.comb += dataout.o.eq(1)
        m.d.comb += dataout.oe.eq(1)

ports = assembly.add_port_group(clk="A5", lr="A4", data="A3", datam="A6", datao="A2") in the interface
But A2 stays at 0