May 2026 monthly summary for Zephyr4Microchip/zephyr: Focused on expanding hardware coverage and improving reliability for Nuvoton Numaker/NUVOTON boards. Delivered SPI enablement for Numaker M335x family and NuMaker USCI SPI controller, enabling SPI peripherals with device-tree configuration and loopback validation. Brought up initial Nuvoton NuMaker M031X SoC support with basic init and aligned GPIO/pinctrl for M031X compatibility, laying groundwork for broader platform support. Fixed a critical memory-mapping issue for m5531/m55m1 devices to ensure correct flash address mapping. Improved test coverage and developer experience through overlays, tests, and driver updates. These results unlock faster onboarding for customers using these boards, reduce integration risk, and broaden Zephyr's hardware ecosystem.

April 2026 (2026-04) — Zephyr project work focused on Numaker board support: PWM enhancements and a memory-model migration to improve flexibility and reliability across Numaker boards. Key features delivered include PWM node support for Numaker m335x in the device tree with extended PWM loopback tests for numaker_m3351ki, and a transition from fixed partitions to a mapped-partition memory model across all Numaker boards. These efforts reduce integration risk, improve hardware compatibility, and streamline future board support. Commit traceability is clear through dedicated feature commits and a migration commit.

March 2026: Delivered initial Nuvoton NuMaker M335X SoC series support and NuMaker M3351KI board integration for nxp-upstream/zephyr, including device tree sources, board configuration, and basic initialization. This enables rapid hardware bring-up and testing for M335X-based boards, reducing onboarding time and accelerating ecosystem validation.

In January 2026, the nrfconnect/sdk-zephyr work focused on expanding hardware coverage and improving onboarding for customers and internal teams. Delivered the Nuvoton NuMaker M55M1 board support, adding configuration files, device tree settings, and user-facing documentation to enable quick prototyping and testing on this new platform. This effort is backed by a single, impactful commit that creates the numaker_gai_m55m1 board variant for the M55M1 series.

December 2025: Delivered a focused device tree naming alignment for the Numaker platform in the Zephyr-based repository, aligning DTS file naming and updating the maintainers list to reflect collaboration. This change improves cross-platform compatibility and reduces setup/configuration friction for Numaker users.

Monthly summary for 2025-11: Nuvoton M333x hardware bring-up on the nrfconnect/sdk-zephyr repo delivering ADC, PWM, and watchdog test enhancements. Implemented ADC node and board API/config/overlay support for numaker_m3334ki; added PWM driver support with DTS nodes; extended watchdog test suite for numaker_m3334ki; fixed watchdog NuMaker driver write-once control register to stabilize tests. These changes improve hardware compatibility, reliability, and test coverage for M333x devices. Commits include: 452e0019321dcddfd2d001498f869632006d91b9; 8f13b37763293aa30d5f938f8e03353e88a94279; 780f260efd76a308e703252d149d5e17955abb71; 333d1160a3740f395482b5e108bb0309e640de9a; 5c31987ce2cb3cae4ea60d26fabac4120a284819; 43d1c516af77f43f7eadbcb0a4a95ed09fdf7c8a.

October 2025: Implemented and documented Nuvoton NuMaker M3334KI board support in Zephyr RTOS, enabling immediate development, testing, and evaluation on the NuMaker M3334KI platform. Delivered configuration files, device tree, board definitions, pin control, and user documentation to accelerate adoption and reduce integration effort.

September 2025 monthly summary focusing on hardware enablement for Nuvoton NuMaker/Numicro on Zephyr, SRAM optimization, RTC compatibility, and developer experience improvements. Key work spanned two repositories with multiple commits across features and a bug fix, driving broader device support and faster time-to-value for customers and internal teams.

Monthly work summary for 2025-08 focusing on expanding hardware support for NuVoton M5531 platform in Zephyr. Implemented device tree support and NuMaker M5531 board integration with configuration updates, enabling developers to prototype and test on M5531-based hardware. Two commits driven this work and set the foundation for broader M55xx support.

July 2025 monthly summary for AmbiqMicro/ambiqzephyr: Focused on improving SPI reliability and strengthening project governance. Delivered a targeted bug fix to enable hardware auto CS control for the Numaker SPI driver in configurations without CS GPIOs, ensuring stable SPI operation. Updated MAINTAINERS to add cyliangtw and ccli8 to hal_nuvoton, improving ownership, review processes, and contributor onboarding. These changes reduce field risk, improve hardware compatibility, and enhance cross-team collaboration across NuVoton components.

June 2025 monthly summary focusing on key accomplishments across AmbiqMicro/ambiqzephyr, with emphasis on improving hardware platform support for Numaker boards and hardening SPI/I/O integrations. Delivered targeted changes that enhance reliability, board bring-up speed, and overall product readiness for customer deployments.

May 2025 performance summary for AmbiqMicro/ambiqzephyr focusing on Nuvoton numaker m55m1x hardware integration. Delivered core PWM and watchdog support for numaker_m55m1x and introduced a PWM loopback device-tree overlay, coupled with a fix to SPI context length tracking. Expanded test coverage to validate PWM loopback on the target board. These changes enhance hardware compatibility, reliability, and overall platform robustness for embedded deployments.

April 2025: Expanded ADC support for Numaker M55M1x within AmbiqZephyr and strengthened testing to validate ADC driver integration. This work enables hardware bring-up for new boards, improves ADC reliability, and reduces future integration time.

November 2024 monthly summary for kholia/zephyr focusing on hardware pin control configuration improvements on Nuvoton Numaker boards. Delivered a feature that removes global PINCTRL from board-level defconfig, enabling PINCTRL only through the specific drivers that require it. This reduces defconfig noise, improves modularity, and increases correctness with driver-scoped PINCTRL enablement. No major bugs reported in this period. Overall, the work enhances maintainability and reliability of pin control configuration across Numaker boards.