October 2025: Completed cross-repo MSPI improvements across the nRF and NXP Zephyr forks, delivering robust transfer paths and hardware-aware data handling that directly impact reliability and data integrity in flash operations. Key features include per-packet transfer support via a new MSPI packet-data-limit binding and the automatic splitting of large transfers in flash_mspi_nor to respect hardware constraints.

September 2025 highlights: Expanded CI/build coverage and stabilized MSPI/NOR driver paths across nxp-upstream/zephyr and nrfconnect/sdk-zephyr. Key wins include CI-enabled builds for the nRF54H20 DK code_relocation_nocopy sample with DTS/overlay alignment, critical MSPI fixes (XIP_DEV_CFG_MASK and RX interrupt race), and substantial MSPI enhancements (CSN pin control, workqueue offload for FIFOs, and multithreading toggles with corresponding tests). Addressed a USB VBUS ready timeout Kconfig dependency on nRF92, and updated SFDP/DTS handling to enable CI for the nRF54H20 DK in sdk-zephyr. These changes reduce build failures, improve flash/mspi reliability, and lay groundwork for robust non-multithreaded/offloaded operation while maintaining maintainability.

August 2025: Delivered cross-repo DDR readiness for SPI memory interfaces and ensured sQSPI v1.0.0 compatibility for nRF54 devices. Implemented and aligned DQS/RXDS handling in the mspi_dw driver and DDR mode support for MX25U flash across Zephyr and NXP upstream, while updating samples and tests to reflect new interfaces. These changes increase achievable SPI throughput, reduce integration risk, and position the platform to leverage higher-performance DDR-enabled memory configurations.

July 2025 performance highlights across nrfconnect/sdk-zephyr, nxp-upstream/zephyr, and nrfconnect/sdk-nrf. Delivered robust MSPI/NOR flash improvements with SFDP-driven initialization, maintainable command handling, and complete QER/OER support, alongside Soft Reset capability. Addressed regression in Quad disabling and enhanced driver stability for high-throughput transfers. Also progressed toward compatibility with sQSPI naming conventions and improved peripheral configurability to support broader hardware deployments, including NRF54 series. These efforts reduce field‑level risk, accelerate hardware bring-up, and strengthen long-term maintainability, enabling more reliable flash operations and smoother upgrade paths for tooling.

June 2025 performance summary focused on stabilizing high-impact peripheral drivers, delivering concrete features, fixing critical issues, and clarifying ownership to improve collaboration and release readiness. The work spanned AmbiqZephyr and NRF Zephyr ports, with a strong emphasis on reliability, correctness, and maintainability, contributing to faster future iterations and reduced production risk.

2025-05 monthly summary focused on reliability, test coverage, and security hardening across AmbiqZephyr and sdk-nrf. Delivered XIP multi-user enable/disable with reference counting and tests; strengthened clock control with readiness checks, DVFS polling, and IRQ/header fixes; improved ADC driver reliability with safe return handling and earlier channel validation; corrected flash driver test sizing and enhanced error visibility for flash writes; hardened MSPI/SQSPI driver with default TX direction when idle and gated FLPR security attributes in non-secure images. These changes reduce production risk, improve power-management accuracy, and strengthen overall system stability, while expanding automated test coverage and maintainability across two major repositories.

April 2025: Focused on enabling robust sQSPI access and stabilizing QSPI behavior. Delivered end-to-end sQSPI MSPI shim integration with driver, tests, samples, docs, and CI coverage across the nRF54 DK ecosystem; fixed a critical CPU hang when re-enabling XIP for NRF QSPI NOR; enhanced test coverage, documentation, and sample scenarios to support repeatable deployments and faster time-to-market.

February 2025 monthly summary for nrfconnect/sdk-nrf focusing on delivering business value through CI/test reliability, upstream compatibility, and robust build/codegen fixes. Highlights include CI/test stability improvements to reduce build times and flakiness, Zigbee Zephyr upstream compatibility, and targeted bug fixes with quarantine entries and release notes alignment.

January 2025 focused on upstream Zephyr alignment, build reliability, and broader POSIX/API coverage to accelerate feature delivery and reduce maintenance across NordicBuilder/sdk-nrf and nrfconnect/sdk-nrf. The work delivered stronger upstream compatibility, more deterministic builds, and expanded platform support across devices, with clear business value in faster releases and increased test stability.

December 2024 monthly summary for NordicBuilder/sdk-nrf: Delivered resource optimization and hardware expansion, with a targeted lint/CI fix improving build reliability. Key changes include disabling XIP in the MSPI driver for the flash_companion sample to reduce FLASH footprint; updating manifest to newer Zephyr and MCUBoot revisions and adding hal_tdk for TDK Hall effect sensors; and removing --ignore BRACES from checkpatch to align with Zephyr CI checks. These changes reduce resource usage, broaden hardware support, and improve CI quality, accelerating future iterations and maintenance.

November 2024 (kholia/zephyr) — Focused on test stability and release readiness. Delivered a targeted bug fix to stabilize img_util tests by increasing stack size, and completed Version 4.0 release documentation with platform coverage and dependencies (Nordic nRF54H, Apollo3, Clock Controllers, nRF70 driver; nrfx 3.7.0). These efforts improve CI reliability, accelerate onboarding for downstream partners, and prepare a robust foundation for the 4.0 release.