March 2026 monthly summary for the Renesas Zephyr project focused on strengthening interrupt reliability and CSR access safety in the RISC-V architecture. Delivered atomic indirect CSR access via MIREG2 with a complete set of micsr2_* helpers and comprehensive Doxygen documentation. Fixed interrupt handling race conditions by adopting atomic CSR helpers and compile-time directives, replacing unsafe two-step CSR sequences. These changes improve ISR reliability, reduce race windows, and provide clearer maintainer guidance, delivering tangible business value through more robust firmware and easier long-term maintenance.

February 2026 monthly summary for zephyrproject-rtos/zephyr focused on improving debuggability with minimal security compromise. Delivered ROM Debugging Access Configuration by introducing CONFIG_PMP_UNLOCK_ROM_FOR_DEBUG to conditionally disable the ROM region PMP lock for machine-mode debuggers. This enables breakpoints and instruction reads in ROM while preserving user-space protections, addressing OpenOCD-related halt issues. The change targets only the ROM region and leverages existing PMP_NO_LOCK_GLOBAL macros, defaulting to disabled in production builds to maintain security. Commit 359dead234a4b3ab58f18a11c83d7044d5d5c74ee7; Fixes: zephyrproject-rtos/zephyr#82729.