JEDEC manufacturer ID for CV32E20

[MikeOpenHWGroup]

We do not yet have a JEDEC Machine Architecture ID assigned to the CV32E20. This will be required to populate the marchid CSR. See the CV32E40P CSR spec for an example (link).

I'm labelling this as a "bug" since it will require a change to the RTL.

[christian-herber-nxp]

@MikeOpenHWGroup: could you change mvendorid to marchid, which is the CSR in question

[MikeOpenHWGroup]

Ah. Well AFAIK, marchid is completely up to us and creation and allocation of these is in @davideschiavone's wheelhouse.

[christian-herber-nxp]

agree. however, it seems that up to date, OpenHW group has allocated a marchid in the global registry of RVI https://github.com/riscv/riscv-isa-manual/blob/master/marchid.md, which seems unnecessary considering OpenHW Group does have a JEDEC vendor ID.

[davideschiavone]

let's move this discussion on MM on the Core TG channel