January 2026: Implemented RISC-V IMSIC interrupt controller integration for Zephyr, including device-tree bindings, public EIIDs API, per-hart SMP initialization, and a complete IMSIC driver with an atomic claim path. Modernized CSR access primitives (introduced csr_swap for atomic read/write) and aligned code to M-mode CSR semantics, with naming updates to micsr_* and corresponding driver usage. Improved code quality by guarding C-only CSR macros from assembly and converting macros to portable do-while forms. Also introduced standalone MCP server to expose authoritative RISC-V data via YAML for AI-assisted tooling, enabling reliable instruction/CSR lookups. These efforts improve interrupt reliability on SMP systems, enhance safety and static-analysis compliance, and provide a data foundation for AI-assisted development.

October 2025: Delivered a modular interrupt controller selection for QEMU RISC-V SoCs in Zephyr, enabling per-SoC configurations (virt_riscv32, virt_riscv32e, virt_riscv64) without altering existing functionality. No major bugs fixed this month; primary focus on architectural refactor and maintainability. Business impact includes reduced configuration churn, easier future extensions, and stronger support for RISC-V virtualization within Zephyr.

September 2025 highlights for zephyrproject-rtos/zephyr: delivered key simulator and SoC integration work that strengthens testing coverage, reduces configuration drift, and improves maintainability. Features include RHX100 board support in the nSIM simulator, ARC-V RMX device tree bindings and CPU clock handling delegated to the SoC, dynamic compiler flag derivation for the arcmwdt RISC-V target, and naming consistency for NSIM ARC_V RMX platforms. Collectively, these changes enable more robust validation of ARC RMX on RHX100, streamline build configuration, and support faster onboarding for contributors.

August 2025: Delivered critical hardware configuration alignment for nsim ARC-V RMX100, streamlined the nsim arc_v rmx build process, introduced RHX SoC support and explicit PMP granularity in RMX, and enhanced documentation for riscv-cheri and nsim_arc_v. These changes improve simulation accuracy, build reliability, and developer onboarding, while expanding toolchain compatibility and configuration clarity across Zephyr and riscv-cheri projects.

Monthly performance summary for 2025-07 focusing on delivering user-centric features, improving cross-target compatibility, and strengthening code hygiene across AmbiqMicro/ambiqzephyr and zephyrproject-rtos/zephyr-testing.