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ICE 3 instructions

Targeted toward Digilent Basys3. Make sure to install the board files.

Tested on Vivado 2018.2.

You can optionally enable Actions on your fork.

The workflow uses the setup-ghdl-ci GitHub action to run a nightly build of GHDL.

First, the workflow uses GHDL to analyze all .vhd files in src/hdl/.

Then it elaborates the any entity with the name *_tb.

Finally, the workflow runs the simulation. If successful then it will quietly exit with a 0 code. If any of the assert statements fail with severity failure then GHDL will cease the simulation and exit with non-zero code; this will also cause the workflow to fail. Assert statements of other severity levels will be reported, but not fail the workflow.