variants: Add community-supported boards

[soburi]

Add support for Renesas EK-RA8D1, NXP FRDM-RW612 and NXP FRDM-MCXN947.

We have confirmed that these compiles when used in combination with
https://github.com/arduino/zephyr/tree/zephyr-arduino-v4.2.0.
We will incorporate the changes for the migration to version 4.4 separately in the near future.
arduino#522 (comment)

I verified this on the FRDM-MCXN947.

[Copilot]

Pull request overview

Adds new Zephyr-based Arduino core “variant” definitions for three community-supported boards (Renesas EK-RA8D1, NXP FRDM-RW612, NXP FRDM-MCXN947), providing the per-board devicetree overlays and Kconfig needed for building sketches against the Zephyr Arduino fork referenced in the PR description.

Changes:

• Added new variant directories for FRDM-RW612, FRDM-MCXN947 (cpu0), and EK-RA8D1 with board-specific *.overlay and *.conf.
• Added variant metadata files (variant.h) and example-exclusion scaffolding (skip_these_examples.txt, known_example_issues.txt) for the new boards.
• Added board-specific artifacts where applicable (e.g., linker scripts and a J-Link flasher script).

Reviewed changes

Copilot reviewed 18 out of 18 changed files in this pull request and generated 8 comments.

Show a summary per file

File	Description
variants/frdm_rw612_rw612/variant.h	Adds legacy Arduino pin macro definitions for the RW612 variant.
variants/frdm_rw612_rw612/skip_these_examples.txt	Adds per-variant example skip list scaffold for RW612.
variants/frdm_rw612_rw612/known_example_issues.txt	Adds per-variant known failing examples list scaffold for RW612.
variants/frdm_rw612_rw612/frdm_rw612_rw612.overlay	Adds RW612 devicetree overlay (USB CDC-ACM + sketch partition + zephyr,user mappings).
variants/frdm_rw612_rw612/frdm_rw612_rw612.conf	Adds RW612 Kconfig settings (USB + networking/WiFi stack configuration).
variants/frdm_mcxn947_mcxn947_cpu0/variant.h	Adds legacy Arduino pin macro definitions for the MCXN947 cpu0 variant.
variants/frdm_mcxn947_mcxn947_cpu0/skip_these_examples.txt	Adds per-variant example skip list scaffold for MCXN947.
variants/frdm_mcxn947_mcxn947_cpu0/linker_script.ld	Adds a linker script intended for variant-specific linking needs.
variants/frdm_mcxn947_mcxn947_cpu0/known_example_issues.txt	Adds per-variant known failing examples list scaffold for MCXN947.
variants/frdm_mcxn947_mcxn947_cpu0/frdm_mcxn947_mcxn947_cpu0.overlay	Adds MCXN947 devicetree overlay (USB CDC-ACM + flash partition + zephyr,user mappings).
variants/frdm_mcxn947_mcxn947_cpu0/frdm_mcxn947_mcxn947_cpu0.conf	Adds MCXN947 Kconfig settings (USB + networking + crypto options).
variants/ek_ra8d1_r7fa8d1bhecbd/variant.h	Adds legacy Arduino pin macro definitions for the EK-RA8D1 variant.
variants/ek_ra8d1_r7fa8d1bhecbd/skip_these_examples.txt	Adds per-variant example skip list scaffold for EK-RA8D1.
variants/ek_ra8d1_r7fa8d1bhecbd/linker_script.ld	Adds a linker script intended for variant-specific linking needs.
variants/ek_ra8d1_r7fa8d1bhecbd/known_example_issues.txt	Adds per-variant known failing examples list scaffold for EK-RA8D1.
variants/ek_ra8d1_r7fa8d1bhecbd/flasher.jlink	Adds a J-Link script intended to program/load the built sketch for EK-RA8D1.
variants/ek_ra8d1_r7fa8d1bhecbd/ek_ra8d1_r7fa8d1bhecbd.overlay	Adds EK-RA8D1 devicetree overlay (enabled peripherals + flash partition + zephyr,user mappings).
variants/ek_ra8d1_r7fa8d1bhecbd/ek_ra8d1_r7fa8d1bhecbd.conf	Adds EK-RA8D1 Kconfig settings (clock + build output tuning).

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[DhruvaG2000]

Any plans to add ci checks for buiding any of these to make sure they build?

[soburi]

Any plans to add ci checks for buiding any of these to make sure they build?

Didn't we run into a disk space shortage issue with this before? I held off on adding it because I was concerned about that. If it looks like there won't be any problems, I'll go ahead and add it.

[DhruvaG2000]

Didn't we run into a disk space shortage issue with this before?

Yeah you're right. With whatever free tier CI containers I don't think we can support more boards in CI :(

LGTM otherwise

[soburi]

Didn't we run into a disk space shortage issue with this before?

Yeah you're right. With whatever free tier CI containers I don't think we can support more boards in CI :(

LGTM otherwise

Regarding this point, once the merge is complete, it might be a good idea to consult having it run in the Arduino repository.