|WARNING| config/arm: add Marvell CN20k

[dpdklab at iol.unh.edu]

Test-Label: ai-code-review
Test-Status: WARNING
https://dpdk.org/patch/172352

_AI Code Review_

=== Patch Review: series.patch (via Claude) ===
Review date: 2026-11-02

# Review of DPDK Patch: config/arm: add Marvell CN20k

## ERRORS

None identified.

## WARNINGS

**Missing release notes update**

The patch adds support for a new platform (Marvell CN20k SoC) but does not update the release notes. New drivers, subsystems, or platform support require release notes documentation.

**Suggested fix:**
Add an entry to `doc/guides/rel_notes/release_25_03.rst` (or the current release) under "New Features" or a similar section:

```rst
* **Added support for Marvell CN20k SoC.**

  Added cross-compilation configuration for Marvell CN20k SoC based on
  ARM Neoverse N3 cores.
```

## INFO

None.

---

## Summary

The patch correctly adds cross-compilation configuration for a new ARM SoC platform. The code changes are straightforward and follow existing patterns in the DPDK ARM configuration:

- Cross-compilation file format matches other ARM platform configs
- SoC configuration structure is consistent with existing entries (cn9k, cn10k)
- Part number `0xd8e` correctly identifies ARM Neoverse N3
- Implementer ID `0x41` is correct for ARM
- The configuration is appropriately simple (no unnecessary complexity)

The only issue is the missing release notes update, which is required for new platform support.

Review-Result: WARNING