February 2026 (2026-02) – nxp-upstream/zephyr. Focused on robustness of ARM MPU-related paths and expanding test coverage for ROM access on RP2040 and RP235x. Delivered a critical fix to the ARM stack protection exclusion and introduced a ROM access verification test suite to improve boot reliability and platform compatibility.

January 2026 monthly summary focusing on Zephyr RTOS and NRF Zephyr contributions. Delivered architecture features and memory-management improvements enabling cryptography workloads and improved performance across RISC-V and RP235x Hazard3 platforms. Implemented Zbb and Zbkb ISA extensions support in Zephyr's RISC-V configuration, updated Raspberry Pi dts for Zbb/Zbkb, added Zbkb support in nrfconnect/sdk-zephyr fromtree via cherry-pick, and enabled SRAM/PSRAM-based execution for RP235x hazard3. Demonstrated cross-repo collaboration and build-flag hardening to support cryptography workloads.

December 2025 monthly summary: Focused on hardening memory protection and improving post-mortem debugging across Zephyr ecosystems, delivering cross-repo improvements that enhance security, stability, and developer productivity for ARM-based and ROM-critical code paths.

Monthly work summary for 2025-11 focusing on targeted code-size optimization in Zephyr for RISCV by introducing a new compiler option, with the change landed in the nxp-upstream/zephyr repository. The effort reduces the footprint of large functions by altering callee-saved register handling in function prologues/epilogues, enabling smaller firmware binaries for memory-constrained devices. The change is aligned with ongoing optimization goals in the upstream project.