March 2026 monthly summary for nxp-upstream/zephyr focused on bootloader security hardening and partition management. Delivered FPROTECT-by-default configuration by shrinking the mcuboot partition to 62k, enabling robust protection with the maximum partition size and simplifying deployment.

Month: 2026-02 — Cross-repo delivery focused on migrating NVS/ZMS to Key-Value Storage Systems, stabilizing builds, and guiding users through migration while maintaining backward compatibility. Key actions spanned Zephyr, Nordic SDK, and Zephyr Microchip forks, delivering a cleaner migration path, improved build reliability, and clear API redirection.

January 2026 monthly highlights focused on strengthening storage architecture and code quality across two major projects. Delivered a unified Key-Value Storage subsystem in Zephyr, reorganized storage components, and completed a targeted unit-test reliability fix in the Nordic SDK test suite. These efforts enhance maintainability, reduce fragmentation, and improve overall system reliability for storage operations.

December 2025: Delivered reliability, observability, and maintainability improvements for MCUboot across NRF54 and Zephyr MCUboot projects, with notable enhancements to external flash handling, binary sizing, and boot-process clarity. The work reduces field boot failures, streamlines debugging, and tightens the secure boot workflow on constrained devices.

November 2025: Strengthened the security and reliability of secure boot and OTA update paths across nrfconnect/sdk-nrf and mcuboot. Delivered encryption-enabled firmware update demonstration, improved boot state initialization and recovery, and hardened image verification using ED25519, resulting in more robust boot flows, easier certification, and reduced risk of failed updates.

October 2025 delivered security and reliability upgrades across MCUBOOT and Zephyr, focusing on boot integrity, encrypted boot paths, test coverage, and maintainability. The work reduces boot-time risk, improves traceability, and strengthens key management and logging for secure firmware upgrades.

In September 2025, I reinforced bootloader test integrity for the nrfconnect/sdk-nrf repository by removing an invalid test case for bl_storage when NSIB is the sole owner. This change eliminates false failures in CI and prevents testing configurations that are not supported, thereby improving reliability and confidence in bootloader behavior across ownership scenarios. The work contributes to overall platform stability and reduces maintenance overhead associated with misleading test results.

Monthly summary for 2025-08 focusing on reliability, security, and alignment with MCUboot changes across the nrfconnect/sdk-nrf and mcuboot repos. Completed critical bug fixes that reduce test debt, ensure correct signing flows, and harden memory safety, delivering measurable business value in product stability and security.

Concise monthly summary for 2025-07 highlighting delivered security enhancements, cryptographic flexibility, and quality improvements across MCUboot and related Zephyr/NRF components. Focused on enabling robust, scalable firmware security posture while improving build-time configurability and developer efficiency.

June 2025 monthly summary: Security hardening and codebase modernization across nrfconnect/sdk-nrf, zephyrproject-rtos/mcuboot, and nrfconnect/sdk-zephyr. Focused on bootloader encryption improvements, critical scrambling bounds fix, and dependency upgrades to maintainability readiness. Coordinated multi-repo changes to accelerate upgrade readiness and reduce risk across the bootstack.

May 2025 monthly summary for developer teams: features delivered, bugs fixed, and impact across multiple repositories. Highlights include size-optimized and build-time efficient MCUBOOT, SHA-512 cryptography support integrated across MCUboot and tooling, and targeted refactors to improve maintainability and future crypto capability. Ecosystem improvements in partition management and testing configurability also progressed, with a dependency update enabling default LTO for MCUBOOT in the SDK, and enhanced Flash Map testing configurability.

April 2025 monthly summary: Delivered security- and performance-focused updates across core boot and image tooling with measurable business value across nrfconnect/sdk-nrf, mcuboot, and AmbiqZephyr. Strengthened boot security by integrating PSA-Lite for bootloader cryptography, defaulting to ED25519 with KMU, and removing redundant key import support. Reduced bootloader size and improved build performance by pruning non-essential features and enabling Link Time Optimization for NSIB builds on NRF54l series. Improved CI/test resilience by skipping KMU-key-dependent tests when KMU keys are unavailable to prevent blocking failures. Prepared MCUboot for NRF5340 by defaulting SPI_NOR off on the cpuapp, enabling stable default configurations while noting that external image storage would require CONFIG_SPI_NOR. Documented ECIES-X25519 support for nRF54L15 and began standardizing bootutil crypto macros and enhancing flash bounds safety with tests. These changes collectively raise security, reduce production risk, and shorten time-to-market for devices based on NRF5340 and related platforms.

March 2025: Delivered critical bootloader and platform integration work focused on security, reliability, and build-time efficiency. Key features include ASN.1 bypass build compatibility and optimization in MCUBOOT, ED25519 support enhancements with expanded SHA options and corrected signature verification, and a PSA Crypto configuration fix to align build settings. In the Nordic nRF Connect SDK, PSA cryptography integration enhancements enabled Ed25519 support via updated dependencies and added build-system flexibility for hash-only selection on the nRF54L series. A targeted refactor for stability reduces resource-management complexity and improves maintainability. These efforts reduce dependencies, shorten compile times, strengthen boot security, and broaden platform support.

February 2025 monthly summary: Targeted bootloader optimization and compatibility maintenance across mcuboot and the NRF Connect SDK. Focused on improving boot performance, stabilizing erase-related features pending TF-M fixes, and enhancing configuration documentation. Deliverables reinforce business value through faster boot paths, broader device compatibility, and clearer configuration guidance, with maintainable, well-documented changes across repositories.

January 2025 monthly work summary focusing on key accomplishments, major bug fixes, and impact across MCUboot and NRF SDK areas. Delivered Ed25519 cryptography enhancements with ASN.1 parsing and PSA backend, fixed simulator/slot handling edge cases, tightened Zephyr build integration for mbedTLS and image encryption, and expanded support for larger MCUboot images in NRF tests. Demonstrated strong security, build reliability, and test infrastructure improvements.

December 2024 monthly summary focused on delivering core boot/configuration enhancements and memory API improvements across two repositories, with security improvements in cryptographic flows for NRF54L deployments. The work drives better device interoperability, stronger boot integrity, and reduced maintenance effort in multi-platform environments.

November 2024 monthly summary across kholia/zephyr, NordicBuilder/sdk-nrf, and zephyrproject-rtos/mcuboot. The portfolio delivered security hardening, improved storage and flash management, and reliability enhancements, with a focus on business value, release readiness, and long-term device longevity.

October 2024 focused on stabilizing SPI NOR operations in Zephyr by fixing a runtime initialization issue when SFDP is enabled. Delivered a targeted bug fix and updated release documentation for Zephyr 4.0 to reflect the resolution, improving reliability for configurations affected by SFDP at runtime and reducing customer support risk.

Month: 2024-09 — Delivered performance and security enhancements for mcuboot in the Zephyr project. Implemented on-device hash calculations with storage access optimization to reduce flash reads during boot and to leverage hardware acceleration when image encryption is disabled. Added PureEdDSA support for direct image signature verification and extended tooling to create/verify signatures, enabling stronger security and streamlined verification workflows. Introduced Kconfig options to configure SHA-on-storage and PureEdDS selection, and extended image tooling to handle pure signatures. Impact: faster secure boot, lower I/O during startup, improved security posture, and easier configuration across bootutil, Zephyr, and imgtool. Technologies demonstrated include bootutil updates, Zephyr Kconfig, SHA and ED25519, and hardware-accelerated hashing and tooling integration.

In May 2024, delivered a security-focused feature for MCUboot in the Zephyr project: Bootloader Image Verification and Encryption using ed25519 and x25519, with a PSA-based verification path. This enables cryptographic image integrity checks and encrypted payload support in the bootloader, strengthening boot security and enabling secure OTA updates. The work is anchored to commit 615a9dffd03e6ebcdd1bcc58a67cc92e5eafea7b. Overall, this delivers a stronger security baseline for boot processes and establishes a foundation for compliant, production-ready secure-boot workflows.