Fixed (kinda... now it's always high)... I forgot to add a clock signal, since inputs are registered by default.
You don't need the bitstream docs for that. Just set PULLUP on the SB_IO cell inferred by arachne-pnr for the IO pin.
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I'll take a look this weekend when I have the chance. PULLUP is easy; IOstandard is bank-specific.
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I think it's OK to ask a user to instantiate SB_IO for LVSD inputs. All other IO standards don't imply changes to the bit-stream.
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