Month: 2025-12 — Delivered two items in nrfconnect/sdk-zephyr: 1) Memory subsystem initialization enhancements for siwx91x: enabled MEMC and tuned initialization priorities to ensure PSRAM startup during system boot. This was implemented in commit 57a2249896a920ce841bc6c4c2a2385831d62d3f (board: silabs: siwx91x). Signed-off-by: S Mohamed Fiaz. 2) RAM configuration synchronization bug fix: aligned device tree RAM size with the build system to prevent PM failures. The fix updates CMakeLists to auto-derive SL_SI91X_SI917_RAM_MEM_CONFIG from the device tree using dt_prop() and list(GET). Implemented in commit e88400036e105b23b944fb69e7ca75775d2302db. Signed-off-by: S Mohamed Fiaz. Impact: more reliable PSRAM startup, reduced PM-related bugs, and improved consistency between hardware description (device tree) and build configuration. Technologies/skills: embedded memory controller configuration, device tree integration, CMake-based build logic, code review/sign-off practices, board bring-up.

Month: 2025-11 — Performance review-ready monthly summary for nrfconnect/sdk-zephyr. Two board-level Peripheral overlays were delivered to expand hardware support and testing capabilities: brd4342a overlays for GPIO, DMA, PWM, and RTC, and brd4338a overlay for Counter support. These changes enable the corresponding APIs (gpio_basic_api, chan_blen_transfer, pwm_api, rtc_api, and counter_basic_api) in Zephyr, improving hardware integration, test coverage, and overall reliability for customer deployments. The work also includes targeted test and configuration updates to ensure proper integration in CI and local testing. Key features delivered: - Brd4342a peripheral overlays: GPIO, DMA, PWM, RTC → enables gpio_basic_api, chan_blen_transfer, PWM, RTC in Zephyr. Commits: 376747f2, 08b55fae, c8fa6c8d, 8dda8fc1. - Brd4338a peripheral overlay: Counter support → enables counter_basic_api in Zephyr. Commit: 8c5e3d05. Major bugs fixed: - Introduced and wired overlays and updated YAML/test files to reflect new overlay configurations, reducing integration friction and fixing gaps in board-level test coverage. Overall impact and accomplishments: - Accelerated hardware enablement for two Silabs boards within Zephyr, expanding testing coverage and improving developer onboarding for board-specific drivers. - Improved QA readiness through explicit overlay definitions and updated tests/configs, supporting more robust CI validation and fewer integration regressions. Technologies/skills demonstrated: - Zephyr overlay configuration and board-level driver enablement - Test automation and test coverage expansion - YAML/config management and CI alignment - Git-based traceability of features to commits Business value: - Faster time-to-first-boot for new board configurations, reduced manual testing effort, and increased confidence in stabilization for brd4342a and brd4338a bring-ups.

October 2025 contributions in zephyr-testing repo focused on power management reliability, timer stability, and power-domain readiness. Delivered three changes that improve low-power behavior, timer accuracy, and power-domain readiness, with direct business value in reduced power consumption, improved hardware compatibility, and faster test stability.

Month: 2025-09 — Monthly summary focusing on key engineering outcomes across Zephyr Silabs efforts. This period delivered notable feature work and critical stability improvements with clear business value, and set the stage for maintainable HAL alignment and future capabilities across two repos. Key features delivered: - hal_silabs: I2C interrupt dispatch exposure/refactor. Exposed and renamed I2C leader/follower interrupt dispatch functions; removed redundant Zephyr driver interrupt handling by leveraging SiSDK dispatch; reduced ISR size and improved maintainability. (Commits: simplicity_sdk patches: b93288021a4d6c4771af29f00c8adda8aab5cb5d; 9ffcdfbb0de59e5f42dc6bbcb8fe63db33758eff) - zephyr-testing: Silabs EFR2 I2C driver with HAL alignment. Introduced I2C driver with support for standard and DMA transfers, plus power management; aligned with newer Silabs HAL version. (Commits: ea6ec6b15ac6fa374ed940550627143ff651082a; 4cd8bcc523c52fa28412e49de1db6051fac7d800; a048ed841d93def9e3cd47a9f8f067b3f503a0f3) Major bugs fixed: - hal_silabs: I2C DMA transfer error handling during interrupt dispatch. Added error handling to stop DMA transfers on errors in both leader and follower interrupt dispatch paths to prevent data corruption/undefined behavior. (Commits: c81e6758da986017f38cb103892eb9364f64395a; a8aff78b27aa43c7565ea123c0f1ddf8d0c43542) - hal_silabs: I2C interrupt callback management aligned with Zephyr RTOS. Relocated callback invocation to SiSDK-specific handler (and analogous in simplicity_sdk) to ensure proper interrupt and callback management per Zephyr practices. (Commits: 156d00d012f657bcf739a2a7a2269c70e95f491b; 23faf8b0572e020eaa44a3fcc55117031d465cc2) Overall impact and accomplishments: - Improved system reliability for I2C on Silabs devices by combining DMA-safe interrupt dispatch with Zephyr-aligned callback handling, reducing risk of data corruption and race conditions in ISR paths. - Achieved maintainable codebase through refactors that centralize dispatch logic and align with SiSDK and Zephyr practices. - Established HAL-aligned Silabs driver baseline (EFR2) to accelerate future feature work and hardware support. Technologies/skills demonstrated: - Zephyr RTOS interrupt model, IRQ management, ISR sizing considerations - I2C standard and DMA transfer workflows, error handling, and DMA lifecycle control - SiSDK integration patterns and HAL alignment across drivers - Cross-repo collaboration and change tracing with clear commit hygiene and documentation