[Libre-soc-dev] Running the libre-soc CPU under cxxsim

[Cesar Strauss]

Em 08/09/2020 05:09, Luke Kenneth Casson Leighton escreveu:
> i've added this:
> 
> +if True:
> +    from nmigen.back.pysim import Simulator, Delay, Settle
> +else:
> +    from nmigen.sim.cxxsim import Simulator, Delay, Settle

As the latest git version, this no longer works.

Replace the two cases above with, simply:

    from nmigen.sim import Simulator, Delay, Settle

Note that "nmigen.sim.pysim" and "nmigen.sim.cxxsim" were never present
in a released nMigen version, so the change in API, in the middle of a
development cycle, is warranted.

> really this should be an environment variable
> 
> import os
>       sim = Simulator(m, engine=os.environ.get('NMIGEN_SIM_MODE"))
> 

This is exactly the way that the simulator API now works.

On the main branch, engine="pysim" is accepted.

On the cxxsim branch, both engine="pysim" and engine="cxxsim" are accepted.

It is expected that the this version of the simulator API will keep
stable until the next release.

Cesar