Monthly summary for 2025-10 focused on decoupling SOF dependencies (rimage signing and MMU mappings) from Zephyr core on i.MX boards in nxp-upstream/zephyr. The work removes rimage signing support from the imx95_evk board configuration and eliminates SOF-specific MMU region mappings for imx93, enabling SOF to manage its own build/signing and reducing core Zephyr dependencies. This decoupling improves modularity, reduces potential cyclic dependencies with external components, and lays groundwork for independent SOF workflows. No critical bugs fixed this month; the primary focus was architectural refactor with clear business value: easier maintenance, faster integration cycles, and more scalable firmware architecture for i.MX platforms.

Month: 2025-09 | Reposit1ries: nxp-upstream/zephyr. This period delivered two critical contributions that enhance TPM reliability and expand MMU-enabled platform support, driving stability and performance for security peripherals and PWM control on modern SoCs.

2025-08 Monthly Summary for nxp-upstream/zephyr focused on governance improvements for firmware ownership. Key features delivered: Added Firmware Maintainer Designation in MAINTAINERS.yml for the firmware subsystem, designating Laurentiu Mihalcea to ensure proper tracking and review of firmware driver changes (commit e7fb812dbb122b93bea385731085b1a1dfd6e4ab). Major bugs fixed: none reported this month. Overall impact and accomplishments: Strengthened accountability and review efficiency for firmware changes, improving release quality and traceability. Technologies/skills demonstrated: YAML configuration, Git-based collaboration, maintainer governance, and change-tracking practices.

July 2025 Monthly Summary — Key deliverables and fixes across two repos (zephyrproject-rtos/sof and geerlingguy/linux). The month focused on stabilizing audio and timing subsystems through targeted driver fixes that reduce runtime risk and improve release readiness. Key deliverables: - zephyrproject-rtos/sof: Reverted Imx95 EDMA driver usage to the legacy nxp,edma configuration to restore compatibility with SOF; stabilized SAI DMA setup to a known-good baseline, reducing intermittent audio path instability. - geerlingguy/linux: Fixed i.MX TPM PWM counter reset when CMOD equals 0, ensuring the counter is reset before updating MOD to prevent unexpected resets and improve PWM period accuracy. Major bugs fixed: - Restored stable EDMA/SPI/I2S/DMA behavior on Imx95 with SOF integration by reverting non-tested DMA changes. - Corrected PWM timing edge cases in i.MX TPM driver to improve PWM reliability and predictability. Overall impact and accomplishments: - Increased system stability and compatibility for critical audio workloads, reducing field issues and support time. - Improved PWM timing accuracy on i.MX platforms, contributing to more reliable motor control and audio signaling where applicable. - Faster release readiness due to a cleaner, regression-reduced patch set across both projects. Technologies/skills demonstrated: - Kernel/driver level debugging and patching (EDMA, SAI, TPM PWM). - Embedded Linux proficiency, hardware-software integration, and cross-repo collaboration. - Clear commit hygiene and documentation accompanying changes.

June 2025 monthly summary for AmbiqMicro/ambiqzephyr. Key feature delivered: SDK-NG build system integration for dma_nxp_edma driver. This involved migrating the dma_nxp_edma driver to the SDK-NG build system, updating CMake configurations to include the new driver, removing outdated references, and applying a manifest revision for hal_nxp. Major bugs fixed: none reported this month; the focus was on integration and setup for future driver deployments. Overall impact and accomplishments: Streamlined driver integration with the SDK-NG build system, improving build reliability and maintainability, enabling faster onboarding of similar drivers with consistent build configurations, reducing engineering toil for future releases. Technologies/skills demonstrated: CMake/build-system proficiency, SDK-NG tooling, driver integration, HAL/driver manifest management, and cross-repo collaboration.

May 2025 monthly summary: Delivered two cross-repo features focused on hardware configuration, driver integration, and build infrastructure, delivering tangible business value through stabilized hardware support and improved performance. Key achievements: - ESAI Pinctrl integration (AmbiqMicro/ambiqzephyr): implemented default pin configuration for NXP ESAI across driver, device tree, and hardware. Board-level pinmux defaults added for ESAI0 on i.MX8QM MEK. Commits: de3b598f9f8a412a0cf00ed878bbaa1b13f7bc8b; 44f346e6d79cfdfb80a20e9edd008dfb893f6280; d474f0a1778b2c9e11563b6385406f5a076ac875. - EDMA Rev2 Driver Integration for SDK-NG on MIMX9596 (nxp-upstream/hal_nxp): ported the EDMA Rev2 hardware acceleration driver to SDK-NG and added architecture-specific support. Builds are now CI-friendly via CMakeLists.txt. Commits: 6110e76b577e5595d28bca65ca66b909e7423ee7; 008b9ccda27eea95370762808da10d5834ca1529. Overall impact and accomplishments: - Strengthened hardware acceleration capabilities and platform readiness for i.MX8QM MEK and MIMX9596, enabling faster bring-up and reliable performance. - Standardized build and integration workflows with CMake, improving reproducibility and developer velocity across two repositories. - Demonstrated end-to-end delivery from kernel driver to board configuration to SDK integration. Technologies/skills demonstrated: - Linux kernel driver development (ISA/EDMA rev2), pinctrl integration, device tree bindings - BSP/board support integration (i.MX8QM MEK) and architecture-specific headers - Build automation and cross-repo collaboration (CMake, SDK-NG integration) - Hardware acceleration concepts and performance-oriented development

April 2025 monthly summary for zephyrproject-rtos/sof focused on stabilizing and improving the audio subsystem. Key change implemented: removed unnecessary CONFIG_COMP_PEAK_VOL guards in the Audio Volume Component to fix breakage when disabled, ensuring the volume control remains functional across configurations. This deliverables improved robustness, reduced runtime errors, and enhanced cross-config reliability for the SOF audio stack.

February 2025 performance summary for zephyrproject-rtos/sof: focused on stability and memory mapping accuracy for the imx95 target in the rimage tool. A single, high-impact bug fix was implemented to ensure firmware is loaded into the correct memory region, enhancing reliability for the imx95 platform.

December 2024 monthly summary focusing on key accomplishments across two repositories: nxp-upstream/hal_nxp and zephyrproject-rtos/sof. Delivered a new EDMA TCD ACTIVE bit macro with accompanying documentation updates; upgraded Zephyr RTOS integration for the imx93_evk board to align with newer Zephyr revisions and naming conventions, including device tree memory node changes and build configuration improvements. These efforts enhance DMA driver reliability, board compatibility, and reduce maintenance overhead by aligning with upstream changes.

Month: 2024-11 — Focused on delivering core features, stabilizing memory interactions, and improving developer-facing documentation across Zephyr and SOF subsystems. Highlights include DMA API improvements for safer, cleaner resource management; SCMI firmware documentation; and a critical memory alignment fix to prevent heap corruption on affected boards.