Bump Verilator to v4.224

[vighneshiyer]

We're working on bumping Verilator to a modern release in Chipyard (https://github.com/ucb-bar/chipyard/pull/1205) and as part of that process we ran into a segfault when trying to simulate a Chipyard SoC with an Ariane core (which might be a Verilator bug).

To isolate the issue, I bumped Verilator in cva6 and verified that the simulation using your infrastructure works fine. This PR contains the minor changes required (see) if you all are interested. Feel free to close this otherwise.

Seemingly resolves (https://github.com/openhwgroup/cva6/issues/931) (vcd dumping works with the latest Verilator) and (https://github.com/openhwgroup/cva6/issues/934)

[JeanRochCoulon]

@zchamski The Thales CI became FAIL with bumped Verilator, do you confirm on your side ?!?

[vighneshiyer]

Does anyone know how to resolve the Eclipse ECA error? I've created an account, signed the ECA, and verified that the email on the ECA matches the one used as the email for this commit. But, the Eclipse webpage still shows a 'failure' (revalidating doesn't do anything either, as expected). Is there something else I need to sign?

[JeanRochCoulon]

@MikeOpenHWGroup or @duncan, do you have an idea ?

[tianrui-wei]

Hi folks, @Jbalkind helped us resolve the eca issue. I believe it's now good to go

[vighneshiyer]

Feel free to merge this now that the ECA issue is resolved, or update the PR to bump to an even more recent Verilator version or close this PR, thanks

[JeanRochCoulon]

Thanks for your contribution but Verilator 4.224 does not pass the regression tests. See https://riscv-ci.pages.thales-invia.fr/dashboard/dashboard_cva6.html As Verilator 5 passes the tests. A plan could be to switch to this up-to-date version.

[JeanRochCoulon]

Hello @vighneshiyer Thank you for your PR. Your PR make us understand that Verilator 5 is better. Our plan is to switch on Verilator 5 soon. I close your PR. See you soon (I hope).