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Marek Białowąs

PROFILE

Marek Białowąs

Worked across the Phoenix-RTOS stack to deliver robust system enhancements, focusing on build optimization, CI/CD modernization, and embedded driver development. In repositories such as phoenix-rtos-build and phoenix-rtos-project, implemented automated compilation database generation, strict build system hardening, and dynamic Docker-based CI pipelines using Shell scripting, C, and YAML. Enhanced device support and reliability in phoenix-rtos-devices by improving IO scheduling and adding configurable USB interrupt priorities. Expanded test coverage and compliance with automated MISRA checks and Cpptest integration. Consistently improved release readiness, cross-repo dependency management, and hardware integration, demonstrating depth in low-level programming, concurrency control, and continuous integration workflows.

Overall Statistics

Feature vs Bugs

81%Features

Repository Contributions

42Total
Bugs
5
Commits
42
Features
22
Lines of code
2,391
Activity Months10

Work History

March 2026

4 Commits • 2 Features

Mar 1, 2026

March 2026 monthly summary for phoenix-rtos/phoenix-rtos-project focused on CI reliability, test visibility, and CI infrastructure modernization to ensure continued delivery velocity with Node.js ecosystem updates.

February 2026

12 Commits • 6 Features

Feb 1, 2026

February 2026 monthly summary for the Phoenix-RTOS projects. Focused on expanding CI automation, improving submodule and cross-repo dependency handling, and extending hardware support and testing coverage across the platform. The team delivered significant enhancements that reduce integration risk, accelerate feedback loops, and broaden device support for customers. Key accomplishments: - Implemented automated MISRA/Cpptest CI checks with module-level analysis and caching, accelerating MISRA compliance feedback and delivering SARIF findings to GitHub. - Strengthened CI reliability with Submodule Management and Cross-Repo Dependency Resolution, including automatic checking out correct commits for PRs/pushes, cross-repo dependency support, and improved submodule updates for device support and compilation fixes. - Enabled Cpptest in CI for phoenix-rtos-kernel, expanding test coverage and consistency across the kernel stack. - Expanded hardware/driver support: added Winbond 25Q64JV flash and ISSI IS34ML NAND support in phoenix-rtos-devices, with improved initialization reliability and chip-detection for single/dual configurations, plus extended testing and watchdog-timing improvements for imx6ull flash. - Added Lighttpd WebSocket tunneling support by introducing mod_wstunnel as a static module, enabling WebSocket tunneling capabilities in the port layer. Overall impact: - Faster, more reliable CI feedback and reduced manual intervention for builds and PR validation. - Broader hardware support enabling customers to deploy on additional flash memories with confidence. - Improved code quality checks and cross-repo coordination reducing integration risk and accelerating feature delivery. Technologies/skills demonstrated: - CI automation (Parasoft CppTest MISRA checks, SARIF reporting) - Submodule and cross-repo dependency management - Parallelized build/test workflows and caching strategies - Embedded hardware driver development and testing (Winbond/ISSIs flash, imx6ull timing and watchdog tweaks) - Web server module integration (Lighttpd mod_wstunnel)

August 2025

6 Commits • 3 Features

Aug 1, 2025

August 2025 performance month focused on stabilizing and modernizing the CI/CD pipeline for phoenix-rtos-project. Delivered dynamic, release-aligned Docker tagging, simplified notifications, and key UBSAN/CI path fixes, while cleaning up obsolete CI configuration. These changes improved release traceability, reduced CI noise, and enhanced build correctness and observability.

July 2025

3 Commits • 2 Features

Jul 1, 2025

July 2025 monthly summary for phoenix-rtos-project focused on stability, performance, and CI reliability. Delivered system-wide stability and performance enhancements across the Phoenix-RTOS stack, including GPIO access optimizations, longjmp pagefault fixes in Micropython, and cross-platform test adjustments. Improved CI reliability by switching to officially released, stable Docker images, replacing beta tags. Updated submodules to align with latest stable dependencies for reproducible builds. Overall, the work resulted in a more reliable runtime, faster CI feedback, and stronger cross-platform compatibility.

June 2025

3 Commits • 1 Features

Jun 1, 2025

June 2025 monthly performance summary for Phoenix-RTOS. Focused on delivering reliability improvements and stricter build quality across two repositories: libphoenix and phoenix-rtos-build.

May 2025

7 Commits • 3 Features

May 1, 2025

May 2025 performance highlights across Phoenix-RTOS stack focusing on build optimization, signaling robustness, and test coverage. Delivered measurable improvements in artifact size and deployment speed, enhanced measurement accuracy, and increased reliability of POSIX-compliant signaling across architectures.

April 2025

3 Commits • 1 Features

Apr 1, 2025

April 2025 monthly summary: Delivered CI/CD modernization for phoenix-rtos-doc by upgrading to Node.js 20 and updating actions/checkout to v4, with improved linting/reporting using reviewdog. Fixed a critical build issue in phoenix-rtos-build by correcting a typo from DEP_LIB to DEP_LIBS in makes/static-lib.mk, ensuring correct dependency handling. These changes reduce build failures, speed up feedback cycles, and strengthen release readiness across the docs and build repositories.

January 2025

1 Commits • 1 Features

Jan 1, 2025

January 2025 – phoenix-rtos/phoenix-rtos-project delivered a focused CI quality enhancement by filtering ShellCheck feedback to newly added lines. The GitHub Actions workflow now reports shellcheck errors only for additions, reducing noise and ensuring reviewers see issues tied to recent changes.

December 2024

2 Commits • 2 Features

Dec 1, 2024

2024-12 Monthly Summary for phoenix-rtos-devices: Implemented two high-impact features that improve performance and configurability, delivering clear business value for storage-heavy workloads and board-specific USB tuning. Key outcomes: - Improved IO scheduling for multi-partition flash access in imxrt-flash (meterfs) by dropping the flash-global mutex between consecutive sector erases, reducing IO starvation and boosting system responsiveness when multiple partitions are in use. - Added configurable EHCI USB interrupt thread priority via board_config.h, with beginthread updated to use the configurable priority, enabling per-board tuning of USB handling and improving stability across configurations. Impact and accomplishments: - Smoother multitasking on flash-intensive workloads and more predictable USB performance across supported boards. - Demonstrated robust low-level scheduling and configurability work, aligning with performance and reliability goals. Technologies/skills demonstrated: - Mutex management and IO scheduling in firmware (meterfs), real-time considerations, C, and embedded storage stacks. - USB EHCI interrupt handling and board-level configurability patterns, including beginthread integration with config-driven priorities. - Clear mapping of commits to features for traceability and review.

March 2023

1 Commits • 1 Features

Mar 1, 2023

2023-03: Delivered Automated Compilation Database Integration for phoenix-rtos-build. When bear is available, the build now automatically generates compile_commands.json, stores it under _build/$TARGET/compile_commands.json, and creates a symlink to the database at the repository root to streamline tooling (IDE support, static analysis, and refactoring). This reduces manual setup, improves code intelligence across CI and local tooling, and accelerates debugging and optimization.

Activity

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Quality Metrics

Correctness91.4%
Maintainability88.6%
Architecture88.0%
Performance86.8%
AI Usage21.0%

Skills & Technologies

Programming Languages

AssemblyBashCC++JSONMakefilePythonShellYAML

Technical Skills

Assembly language programmingBuild System ConfigurationBuild SystemsC ProgrammingC programmingCI/CDConcurrencyConcurrency ControlDevOpsDevice DriversDockerDriver DevelopmentEmbedded SystemsGitGitHub Actions

Repositories Contributed To

8 repos

Overview of all repositories you've contributed to across your timeline

phoenix-rtos/phoenix-rtos-project

Jan 2025 Mar 2026
5 Months active

Languages Used

YAMLCPythonBashShellC++MakefileJSON

Technical Skills

CI/CDShell ScriptingDevOpsDevice DriversEmbedded SystemsKernel Development

phoenix-rtos/phoenix-rtos-devices

Dec 2024 Feb 2026
3 Months active

Languages Used

C

Technical Skills

Concurrency ControlDriver DevelopmentEmbedded SystemsRTOSDevice DriversHardware Interaction

phoenix-rtos/phoenix-rtos-build

Mar 2023 Jun 2025
4 Months active

Languages Used

ShellMakefile

Technical Skills

build automationshell scriptingBuild SystemsShell ScriptingToolchain ManagementBuild System Configuration

phoenix-rtos/libphoenix

May 2025 Jun 2025
2 Months active

Languages Used

AssemblyC

Technical Skills

C ProgrammingLow-level programmingSignal HandlingSignal handlingSystem ProgrammingSystem programming

phoenix-rtos/phoenix-rtos-doc

Apr 2025 Apr 2025
1 Month active

Languages Used

YAML

Technical Skills

CI/CDGitHub Actions

phoenix-rtos/phoenix-rtos-kernel

May 2025 Feb 2026
2 Months active

Languages Used

CYAML

Technical Skills

ConcurrencyOperating SystemsSignal HandlingSystem ProgrammingCI/CDTesting

phoenix-rtos/phoenix-rtos-tests

May 2025 May 2025
1 Month active

Languages Used

C

Technical Skills

POSIX SignalsSystem ProgrammingTesting

phoenix-rtos/phoenix-rtos-ports

Feb 2026 Feb 2026
1 Month active

Languages Used

C

Technical Skills

C programmingstatic module integrationweb server development