
Bartosz Miller developed and stabilized hardware driver tests and platform support across AmbiqMicro/ambiqzephyr and zephyrproject-rtos/zephyr, focusing on embedded systems and device driver validation. He expanded I2C and MSPI flash driver test coverage, introduced overlay-based configuration for flexible hardware scenarios, and improved cross-device compatibility for Nordic platforms. Using C, Device Tree, and YAML, Bartosz addressed hardware integration issues by refining pin assignments, fixture management, and test automation, which reduced CI flakiness and improved regression detection. His work demonstrated depth in embedded systems testing and driver development, resulting in more reliable hardware validation and accelerated feedback for hardware-enabled features.

October 2025: NRF54 Flash Test Suite Stabilization in zephyr. Stabilized and hardened the NRF54 flash driver test suite by fixing fixture assignment, excluding incompatible hardware from default tests, and ensuring the required gpio_loopback fixture is present for relevant tests. This work improves test reliability, reduces flaky results, and strengthens hardware coverage across NRF54 variants, contributing to CI stability and faster feedback for hardware-enabled features.
October 2025: NRF54 Flash Test Suite Stabilization in zephyr. Stabilized and hardened the NRF54 flash driver test suite by fixing fixture assignment, excluding incompatible hardware from default tests, and ensuring the required gpio_loopback fixture is present for relevant tests. This work improves test reliability, reduces flaky results, and strengthens hardware coverage across NRF54 variants, contributing to CI stability and faster feedback for hardware-enabled features.
September 2025 monthly summary for zephyrproject-rtos/zephyr. Key features delivered: I2C testing enhancements for the NRF54H20 PPR, extending I2C testing capabilities with new configuration and overlay files to enable the full I2C test suite on this hardware (configures I2C controllers, pins, and buffer sizes). Major bugs fixed: No major bugs fixed this month. Overall impact and accomplishments: Expanded hardware test coverage for I2C on NRF54H20, enabling all possible I2C tests and earlier detection of integration issues, which reduces field risk and accelerates QA cycles for NRF54H20-based platforms. Technologies/skills demonstrated: driver testing, hardware test configuration, overlay management, and cross-board validation within Zephyr CI; effective use of commit-driven changes to extend test capabilities.
September 2025 monthly summary for zephyrproject-rtos/zephyr. Key features delivered: I2C testing enhancements for the NRF54H20 PPR, extending I2C testing capabilities with new configuration and overlay files to enable the full I2C test suite on this hardware (configures I2C controllers, pins, and buffer sizes). Major bugs fixed: No major bugs fixed this month. Overall impact and accomplishments: Expanded hardware test coverage for I2C on NRF54H20, enabling all possible I2C tests and earlier detection of integration issues, which reduces field risk and accelerates QA cycles for NRF54H20-based platforms. Technologies/skills demonstrated: driver testing, hardware test configuration, overlay management, and cross-board validation within Zephyr CI; effective use of commit-driven changes to extend test capabilities.
August 2025 monthly summary for Zephyr OSS contributions focusing on feature delivery, test coverage, and platform support across two repositories. The work emphasized reliability, validation, and broader hardware support to shorten validation cycles and accelerate customer adoption.
August 2025 monthly summary for Zephyr OSS contributions focusing on feature delivery, test coverage, and platform support across two repositories. The work emphasized reliability, validation, and broader hardware support to shorten validation cycles and accelerate customer adoption.
2025-07 monthly summary for AmbiqMicro/ambiqzephyr focused on expanding test coverage for the MSPI flash driver in single I/O mode using the MX25UW63. Delivered a dedicated test case added to the common flash driver test matrix and configured the required pin controls and device properties to enable reliable execution.
2025-07 monthly summary for AmbiqMicro/ambiqzephyr focused on expanding test coverage for the MSPI flash driver in single I/O mode using the MX25UW63. Delivered a dedicated test case added to the common flash driver test matrix and configured the required pin controls and device properties to enable reliable execution.
June 2025 (2025-06): Key testing stability enhancements in AmbiqZephyr for NRF52/NRF53 development boards. Delivered critical I2C pin assignment corrections and stabilized tests by disabling the second QDEC instance, resulting in more reliable automated testing and faster CI feedback.
June 2025 (2025-06): Key testing stability enhancements in AmbiqZephyr for NRF52/NRF53 development boards. Delivered critical I2C pin assignment corrections and stabilized tests by disabling the second QDEC instance, resulting in more reliable automated testing and faster CI feedback.
Month: 2025-05 – This period delivered expanded Nordic device coverage and strengthened testing for AmbiqZephyr, driving broader platform compatibility and improved reliability. The work enhances cross-device functionality, accelerates integration with Nordic hardware, and demonstrates strong testing discipline and collaboration across targets.
Month: 2025-05 – This period delivered expanded Nordic device coverage and strengthened testing for AmbiqZephyr, driving broader platform compatibility and improved reliability. The work enhances cross-device functionality, accelerates integration with Nordic hardware, and demonstrates strong testing discipline and collaboration across targets.
In April 2025, delivered targeted test infrastructure improvements for AmbiqZephyr across I2C and CAN interfaces. Key features include adding I2C Slave Testing support for multiple speeds via overlay-based bitrate configurations and updating test cases for new speed scenarios; fixed a test configuration issue in CAN host tests on NRF54H by enabling GPD for the CAN interface. These changes broaden test coverage, reduce false negatives, and improve hardware-level validation, strengthening quality assurance for I2C and CAN features and enabling faster iteration with robust tests.
In April 2025, delivered targeted test infrastructure improvements for AmbiqZephyr across I2C and CAN interfaces. Key features include adding I2C Slave Testing support for multiple speeds via overlay-based bitrate configurations and updating test cases for new speed scenarios; fixed a test configuration issue in CAN host tests on NRF54H by enabling GPD for the CAN interface. These changes broaden test coverage, reduce false negatives, and improve hardware-level validation, strengthening quality assurance for I2C and CAN features and enabling faster iteration with robust tests.
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