Non-implemented CSR Check

[emgens]

Added explicit check for non implemented CSR's to riscv_csr test.
Cleaned up cv32e20_csr_template.yaml.
This should run cleanly with cve2 pull request 167
There is an entry to work around issue 179, this should be removed once this issue is cleared.

[MikeOpenHWGroup]

LGTM @emgens. Really appreciate the README!

Question: when I run riscv_csr locally with Questasim it fails with this error message:

# ERROR: Unexpected illegal instruction while accessing CSR 0xc00

I assume that this is related to #166, is that correct?

[emgens]

LGTM @emgens. Really appreciate the README!

Question: when I run riscv_csr locally with Questasim it fails with this error message:

# ERROR: Unexpected illegal instruction while accessing CSR 0xc00

I assume that this is related to #166, is that correct?

It's #167, but yes. That pull request implements the user space CSR's, so you'll get this error if that isn't included.

[emgens]

There are known failures in this test case that should be resolved by CVE2 pull request #167

[MikeOpenHWGroup]

Thanks @emgens. I will merge this in and add the riscv_csr test to the CI regression when cve2 #167 is resolved.