June 2026 monthly summary focused on expanding FLPR core test coverage and test infrastructure across the NRF54H20 platform and related Zephyr projects. Delivered end-to-end driver testing enhancements, updated test overlays, and cross-repo test configuration to enable Twister-based validation of critical FLPR components. The work emphasizes business value through increased reliability, faster feedback in CI, and stronger validation of core drivers prior to production releases.

May 2026 monthly performance summary for FLPR-related Zephyr work. Delivered cross-repo SPI enablement and GPIO reliability improvements across Zephyr main and Nordic/NCS-Zephyr integration, strengthening CI coverage and hardware compatibility. Key outcomes include SPI test overlays for the FLPR core enabling Twister-based testing in both zephyrproject-rtos/zephyr and nrfconnect/sdk-zephyr, plus targeted GPIO stability fixes and test optimizations that reduce flaky results on interrupt-unsupported platforms. These changes enhance test accuracy, accelerate feedback loops, and demonstrate strong cross-team collaboration and CI-driven quality improvements.

April 2026 monthly summary for nrfconnect/sdk-nrf: Implemented PWM support for the FLPR core and aligned CI tests to validate PWM scenarios via Twister. Added test overlays for PWM validation and disabled the gpio_event test due to IRQ absence to maintain CI stability. These changes extend hardware feature coverage, improve test reliability, and accelerate feedback for PWM-related development.

March 2026: Delivered GPIO support for the nRF54H20 FLPR core in Zephyr with Twister-ready overlays; extended GPIO test overlays in SDK-NRF to enable FLPR core tests under Twister. No major bugs fixed were documented in this period; emphasis was on feature delivery, testing readiness, and cross-repo alignment. Impact: faster validation of GPIO functionality on Nordic hardware, improved test automation, and stronger cross-repo consistency. Technologies: Zephyr GPIO subsystem, Nordic FLPR core, Twister testing framework, test overlays, DCO-compliant commits.

February 2026 highlights two cross-repo feature optimizations for NRF54H20 PPR core with XIP: (1) performance improvement by adjusting max shortest ticks, and (2) sleep optimization for XIP configuration. These changes, validated through kernel sleep tests, reduce wake/sleep latency and improve power efficiency on NRF54H20-based devices. Commits include 802a7d44bc205b4d5bcac11e7a04f724ba645649 and 125afecddd055341bb064102bfae795fc7aadfcd, with sign-offs by Paweł Pelikan.

Monthly summary for 2025-12: HAL Nordic module upgrade to latest revision in nrfconnect/sdk-zephyr with manifest updates to reflect the new hal_nordic revision, ensuring hardware abstraction layer aligns with latest Nordic changes. Two commits were applied (one direct update and one from-tree cherry-pick) with signed-off provenance. No major bugs fixed this month; focus was on integration and stabilization of the HAL upgrade.

Month 2025-11: NRF54H20 test stability and performance improvements for nrfconnect/sdk-zephyr. Focused on tuning the system clock and sleep timings to improve test performance and reliability on slower NRF54 platforms. Result: more deterministic CI results and faster feedback loops.

September 2025 monthly summary for zephyrproject-rtos/zephyr-testing focused on delivering a critical sleep-duration accuracy fix for the NRF54H20 PPR core and reinforcing kernel timing reliability. The changes align with our hardware-specific configurations and high tick-rate scenarios, improving predictability of sleep periods in time-sensitive workloads.

November 2024 | Telink Semiconductor (telink-semi/zephyr): Delivered Global Domain Frequency Scaling (GDFS) service integration for Nordic Semiconductor HAL, enabling smarter power and performance management. Added configuration options and build-system integration (Kconfig and CMakeLists.txt) to enable and utilize the new service. Implemented under commit 630f716c2f4b1cf630af8d34f2ac2a76da27f92f, establishing a foundation for dynamic domain scaling.