lowRISC/opentitan
Jul 2025 – Mar 2026
5 Months active
Languages Used
SystemVerilogHjsonYAMLC++HJSON
Technical Skills
ASIC DevelopmentHardware DesignConfiguration ManagementCI/CDDevOpsYAML scripting
Samuel Riedel
PROFILE
Samuel Riedel
Stefan Riedel contributed to the lowRISC/opentitan repository by enhancing hardware-software integration and build reliability for ASIC and FPGA flows. He improved configuration management and CI/CD pipelines, addressing issues such as incorrect hardware primitive usage and misaligned build paths, and introduced structured revision history for the rv_core_ibex core to strengthen traceability. Stefan delivered Ibex ISA enhancements, including ZCB/ZCMP extensions and compressed instruction support, while maintaining upstream compatibility and formal verification rigor. His work involved SystemVerilog, YAML scripting, and C++, with a focus on documentation, testbench development, and process improvements that reduced integration risk and improved maintainability across releases.
Overall Statistics
Feature vs Bugs
33%Features
Repository Contributions
8Total
Bugs
4
Commits
8
Features
2
Lines of code
10,621
Activity Months5
Your Network
124 peopleWork History
March 2026
1 Commits • 1 Features
Mar 1, 2026March 2026 monthly summary for lowRISC/opentitan focused on strengthening traceability and release readiness for rv_core_ibex through structured revision history and versioning. Key changes align design and verification stages with a formalized revision history, enhancing documentation, audits, and maintainability. No major bugs fixed this month; work emphasizes process improvements and long-term business value. Demonstrated technologies/skills include versioning discipline, commit-signoff practices, and cross-stage collaboration to support auditable releases.
1 Commits • 1 Features
Mar 1, 2026March 2026 monthly summary for lowRISC/opentitan focused on strengthening traceability and release readiness for rv_core_ibex through structured revision history and versioning. Key changes align design and verification stages with a formalized revision history, enhancing documentation, audits, and maintainability. No major bugs fixed this month; work emphasizes process improvements and long-term business value. Demonstrated technologies/skills include versioning discipline, commit-signoff practices, and cross-stage collaboration to support auditable releases.
March 2026
December 2025
3 Commits • 1 Features
Dec 1, 2025Monthly summary for 2025-12: Ibex ISA enhancements delivered to improve code density and performance, plus stability fixes to OpenTitan integration. The work emphasizes upstream compatibility, verification rigor, and maintainability to support faster delivery cycles and lower risk in hardware-software integration.
December 2025
3 Commits • 1 Features
Dec 1, 2025Monthly summary for 2025-12: Ibex ISA enhancements delivered to improve code density and performance, plus stability fixes to OpenTitan integration. The work emphasizes upstream compatibility, verification rigor, and maintainability to support faster delivery cycles and lower risk in hardware-software integration.
October 2025
1 Commits
Oct 1, 2025October 2025 monthly summary for developer work focusing on business value and technical accomplishments in the lowRISC/opentitan repository.
1 Commits
Oct 1, 2025October 2025 monthly summary for developer work focusing on business value and technical accomplishments in the lowRISC/opentitan repository.
October 2025
September 2025
1 Commits
Sep 1, 20252025-09 focused on stabilizing configuration and build reliability for opentitan’s top_darjeeling path. Delivered a critical bug fix to align chip_conn_cfg.hjson with Earl Grey configuration by removing hardcoded paths (conn_csvs_dir and rel_path) and guarding against unset top_chip. This reduces CI/build failures and manual intervention, enabling smoother verification for formal paths across chips.
September 2025
1 Commits
Sep 1, 20252025-09 focused on stabilizing configuration and build reliability for opentitan’s top_darjeeling path. Delivered a critical bug fix to align chip_conn_cfg.hjson with Earl Grey configuration by removing hardcoded paths (conn_csvs_dir and rel_path) and guarding against unset top_chip. This reduces CI/build failures and manual intervention, enabling smoother verification for formal paths across chips.
July 2025
2 Commits
Jul 1, 2025In 2025-07, delivered a crucial bug fix for the Darjeeling ASIC build configuration in the lowRISC/opentitan repository. The changes align technology primitives, remove incorrect generic primitives, and correct the chip codename, ensuring the build uses the correct hardware primitives and that documentation reflects the Darjeeling chip. This reduces production risk, improves CI reliability for the Darjeeling flow, and enhances maintainability.
2 Commits
Jul 1, 2025In 2025-07, delivered a crucial bug fix for the Darjeeling ASIC build configuration in the lowRISC/opentitan repository. The changes align technology primitives, remove incorrect generic primitives, and correct the chip codename, ensuring the build uses the correct hardware primitives and that documentation reflects the Darjeeling chip. This reduces production risk, improves CI reliability for the Darjeeling flow, and enhances maintainability.
July 2025
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Quality Metrics
Correctness95.0%
Maintainability95.0%
Architecture95.0%
Performance95.0%
AI Usage25.0%
Skills & Technologies
Programming Languages
C++HJSONHjsonSystemVerilogYAML
Technical Skills
ASIC DevelopmentCI/CDConfiguration ManagementDevOpsFPGA designHardware DesignRISC-V architectureRTL designSystemVerilogYAML scriptingdigital designdocumentationformal verificationhardware designtestbench development
Repositories Contributed To
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