Known-to-fail MVCE for arachne-pnr Pullup instantiation

build_top.bat

@echo off
rem Autogenerated by Migen

yosys -q -l top.rpt top.ys || exit /b
arachne-pnr  -d 1k -P tq144 -p top.pcf top.blif -o top.txt || exit /b
icetime  -P tq144 -d hx1k -c 0.0 -t -p top.pcf -r top.tim top.txt || exit /b
icepack  top.txt top.bin || exit /b

top.pcf

set_io clk12 21
set_io my_out 44
set_io my_pullup 119

top.v

/* Machine-generated using Migen */
module top(
	input clk12,
	inout my_pullup,
	output my_out,
);

SB_IO #(
	.PIN_TYPE(1'd0),
	.PULLUP(1'd1)
) SB_IO (
	.INPUT_CLK(clk12),
	.PACKAGE_PIN(my_pullup),
	.D_IN_0(my_out)
);

endmodule

top.ys

read_verilog top.v
synth_ice40 -top top -blif top.blif