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Once flashed, the J11 LED alternate blinks with all the other LEDs. If
you hold the button, all LEDs blink in unison. The board definition is
otherwise incomplete.
The iceprog '-u' flag is available in my icestorm fork. This needs a
bunch of environment variables to build and run. Make sure you have all
the other Amaranth things installed.
Here's a very manual way to set the env vars, just in case you haven't
put anything on your path.
YOSYS=yowasp-yosys \
NEXTPNR_ICE40=yowasp-nextpnr-ice40 \
ICEPACK=path/to/your/icepack \
ICEPROG=path/to/your/iceprog \
python3 -m amaranth_boards.alchitry_cuv2
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