October 2025 monthly summary for zephyrproject-rtos/zephyr focused on stabilizing PECI transactions during deep sleep. Implemented a lock around PECI transfers to prevent sleep during PECI operations and release upon completion, ensuring clocks remain active and preventing PECI transaction failures in the NPCX PECI driver. This change enhances reliability of power management paths and reduces risk of PECI-related deadlocks or clock gating during deep sleep.

September 2025: Zephyr project achievements across NPCX/NPCK ESPI and NPCK PS2 controller support. Key deliverables include granular device tree differentiation and Kconfig options for NPCX vs NPCK ESPI variants, improved hardware feature selection and configuration safety. NPcx eSPI register access was corrected to align with the datasheet, preventing misreads and ensuring reliability. ESPI driver enhancements add SLP_LAN and SLP_WLAN signals and increase the out-of-band (OOB) payload, enabling richer telemetry and control. NPCK3 ESPI support was added with 66MHz operation, updated reset handling, and TAF/flash improvements for faster bring-up and more robust flash timing. NPCKn PS2 controller definitions were aligned with NPCKn datasheet, improving interrupt mapping and bit assignments. These changes collectively improve hardware compatibility, reduce configuration risk, enable new platform capabilities, and demonstrate strong driver development, datasheet alignment, and performance-oriented engineering.

Monthly summary for 2025-08 focusing on Zephyr testing, with emphasis on hardware register correctness for the GDMA in NPCX. No new features released this month; primary effort centered on a critical bug fix to align GDMA register definitions with NPCX specifications and ensure reliable DMA controller access.

July 2025 monthly summary for zephyr-testing repository (zephyrproject-rtos/zephyr-testing). This period prioritized enabling GDMA on Nuvoton NPCX variants to accelerate data transfers and improve system recognition. Key work included Device Tree Bindings and a complete GDMA driver implementation with configuration and build-system updates. Despite no reported bug fixes in this repository this month, the work delivers measurable business value by enabling hardware-accelerated DMA, reducing CPU overhead, and improving data throughput for DMA-heavy workloads. Technologies demonstrated include Device Tree, DMA driver development, Kconfig and CMake integration, and NPCX platform specifics.

Month: 2025-05 – AmbiqMicro/ambiqzephyr focused fixes to improve NPCX power management, robustness, and explicit control of SHI, improving reliability in production environments.

Concise monthly summary for 2025-04 focusing on key features delivered and impact in AmbiqMicro/ambiqzephyr.