lowRISC/opentitan
Jul 2024 – Jun 2026
15 Months active
Languages Used
PythonTclMarkdownCHjsonSystemVerilogElispHJSON
Technical Skills
Python scriptingTcl scriptingdebuggingsimulationDocumentationTechnical Writing
Martin Velay
PROFILE
Martin Velay
Over 15 months, contributed to the lowRISC/opentitan repository by developing and verifying hardware features, with a focus on cryptographic modules, access control, and DV infrastructure. Delivered 32 features and resolved 16 bugs, enhancing reliability and security through improvements in HMAC, SPI, and entropy source verification. Applied SystemVerilog, Python, and Tcl scripting to expand test coverage, optimize regression performance, and refine documentation for onboarding and maintenance. Integrated new debugging workflows, strengthened test automation, and improved simulator compatibility. The work emphasized code quality, process clarity, and robust verification methodologies, supporting faster silicon validation and reducing risk in security-critical hardware components.
Overall Statistics
Feature vs Bugs
67%Features
Repository Contributions
116Total
Bugs
16
Commits
116
Features
32
Lines of code
24,850
Activity Months15
Your Network
136 peopleWork History
June 2026
2 Commits
Jun 1, 2026June 2026 monthly summary for the lowRISC/opentitan project focused on strengthening entropy source verification reliability and test coverage. Delivered targeted improvements to test-coverage and resilience, including reseeding configurations for GPIO and OTP verification paths to close observed gaps, and reintroduced a random reset stress test to address hang issues and provide visibility into failing seeds. These changes improve reliability of entropy verification, reduce risk in security-critical components, and enhance debugging visibility for seed-related failures.
2 Commits
Jun 1, 2026June 2026 monthly summary for the lowRISC/opentitan project focused on strengthening entropy source verification reliability and test coverage. Delivered targeted improvements to test-coverage and resilience, including reseeding configurations for GPIO and OTP verification paths to close observed gaps, and reintroduced a random reset stress test to address hang issues and provide visibility into failing seeds. These changes improve reliability of entropy verification, reduce risk in security-critical components, and enhance debugging visibility for seed-related failures.
June 2026
May 2026
4 Commits • 2 Features
May 1, 2026Monthly summary for 2026-05 focusing on delivery of code quality and test robustness for the lowRISC/opentitan DV regression and SPI/power management areas. The work delivered faster feedback loops, improved maintainability, and expanded test coverage with targeted hardening of the DV environment and test infrastructure.
May 2026
4 Commits • 2 Features
May 1, 2026Monthly summary for 2026-05 focusing on delivery of code quality and test robustness for the lowRISC/opentitan DV regression and SPI/power management areas. The work delivered faster feedback loops, improved maintainability, and expanded test coverage with targeted hardening of the DV environment and test infrastructure.
April 2026
3 Commits
Apr 1, 2026April 2026 monthly summary for lowRISC/opentitan: Xcelium simulator compatibility and reliability improvements were delivered, addressing multiple issues to stabilize coverage-driven ranking. Key changes include ensuring runs.txt is populated with newline-delimited coverage database paths, prefixing covergroup database names to avoid namespace collisions, and removing a duplicate exclusion entry to streamline the script.
3 Commits
Apr 1, 2026April 2026 monthly summary for lowRISC/opentitan: Xcelium simulator compatibility and reliability improvements were delivered, addressing multiple issues to stabilize coverage-driven ranking. Key changes include ensuring runs.txt is populated with newline-delimited coverage database paths, prefixing covergroup database names to avoid namespace collisions, and removing a duplicate exclusion entry to streamline the script.
April 2026
August 2025
4 Commits • 2 Features
Aug 1, 2025Concise monthly summary for 2025-08 focused on lowRISC/opentitan DV work in ac_range_check. The work emphasizes increases in verification coverage, documentation, and process clarity to reduce risk and accelerate validation cycles.
August 2025
4 Commits • 2 Features
Aug 1, 2025Concise monthly summary for 2025-08 focused on lowRISC/opentitan DV work in ac_range_check. The work emphasizes increases in verification coverage, documentation, and process clarity to reduce risk and accelerate validation cycles.
July 2025
1 Commits
Jul 1, 2025July 2025 monthly summary for lowRISC/opentitan: Implemented targeted DV documentation fix and asset relocation to improve maintainability and reduce onboarding time. Focused on ac_range_check DV block diagram README link and centralizing the diagram in the OT drive.
1 Commits
Jul 1, 2025July 2025 monthly summary for lowRISC/opentitan: Implemented targeted DV documentation fix and asset relocation to improve maintainability and reduce onboarding time. Focused on ac_range_check DV block diagram README link and centralizing the diagram in the OT drive.
July 2025
June 2025
1 Commits
Jun 1, 2025Concise monthly summary for 2025-06 focusing on DV documentation improvements and their business value.
June 2025
1 Commits
Jun 1, 2025Concise monthly summary for 2025-06 focusing on DV documentation improvements and their business value.
May 2025
13 Commits • 3 Features
May 1, 2025May 2025 (lowRISC/opentitan) monthly summary focusing on key features delivered, major bugs fixed, and overall impact. The month emphasized verification quality, DV improvements, and documentation hygiene to accelerate security validation and release readiness.
13 Commits • 3 Features
May 1, 2025May 2025 (lowRISC/opentitan) monthly summary focusing on key features delivered, major bugs fixed, and overall impact. The month emphasized verification quality, DV improvements, and documentation hygiene to accelerate security validation and release readiness.
May 2025
April 2025
6 Commits • 2 Features
Apr 1, 2025Concise Monthly Summary — April 2025 (2025-04) This month focused on strengthening verification reliability for critical security controls in OpenTitan and stabilizing test coverage for cryptographic routines. Delivered enhancements with clear spec alignment, improved testbench robustness, and documentation updates to support future maintenance and onboarding. The work reduced risk in access-control validation and increased confidence in HMAC reliability under varied reset scenarios.
April 2025
6 Commits • 2 Features
Apr 1, 2025Concise Monthly Summary — April 2025 (2025-04) This month focused on strengthening verification reliability for critical security controls in OpenTitan and stabilizing test coverage for cryptographic routines. Delivered enhancements with clear spec alignment, improved testbench robustness, and documentation updates to support future maintenance and onboarding. The work reduced risk in access-control validation and increased confidence in HMAC reliability under varied reset scenarios.
March 2025
29 Commits • 11 Features
Mar 1, 2025March 2025 marked a broad set of DV and verification improvements for lowRISC/opentitan, delivering key features, stabilizing tests, and expanding coverage across HMAC, SCB, TLUL, and ac_range_check. The changes drive faster, more reliable regression cycles and clearer documentation, enabling quicker silicon validation and release readiness.
29 Commits • 11 Features
Mar 1, 2025March 2025 marked a broad set of DV and verification improvements for lowRISC/opentitan, delivering key features, stabilizing tests, and expanding coverage across HMAC, SCB, TLUL, and ac_range_check. The changes drive faster, more reliable regression cycles and clearer documentation, enabling quicker silicon validation and release readiness.
March 2025
February 2025
26 Commits • 6 Features
Feb 1, 2025February 2025 monthly summary for lowRISC/opentitan focused on delivering measurable business value through expanded DV coverage, stability improvements, and DV infrastructure migration. The month saw substantive feature work in HMAC DV and ACRC DV, alongside targeted RTL bug fixes and foundational DV environment work to accelerate testing and future milestones. The following achievements capture the engineering impact, collaboration, and readiness for ongoing development cycles.
February 2025
26 Commits • 6 Features
Feb 1, 2025February 2025 monthly summary for lowRISC/opentitan focused on delivering measurable business value through expanded DV coverage, stability improvements, and DV infrastructure migration. The month saw substantive feature work in HMAC DV and ACRC DV, alongside targeted RTL bug fixes and foundational DV environment work to accelerate testing and future milestones. The following achievements capture the engineering impact, collaboration, and readiness for ongoing development cycles.
January 2025
10 Commits • 1 Features
Jan 1, 2025January 2025 monthly summary for lowRISC/opentitan focusing on HMAC reliability and DV coverage. Delivered core reset and FIFO status corrections and hardened HMAC verification environment, improving stability, reducing false interrupts, and expanding test coverage for secure peripherals.
10 Commits • 1 Features
Jan 1, 2025January 2025 monthly summary for lowRISC/opentitan focusing on HMAC reliability and DV coverage. Delivered core reset and FIFO status corrections and hardened HMAC verification environment, improving stability, reducing false interrupts, and expanding test coverage for secure peripherals.
January 2025
December 2024
11 Commits • 2 Features
Dec 1, 2024December 2024 monthly summary for lowRISC/opentitan: Delivered key HMAC improvements and verification enhancements focusing on security, correctness, and DV maturity. Gated DIGEST and MSG_LENGTH updates to IDLE to prevent secret leakage; added data-clearing assertions and wipe-secret documentation updates. Expanded verification environment for HMAC reliability with FSM stress testing, timing-related delays, reset handling during message processing, and enhanced simulator compatibility. Strengthened DV coverage with new tests for FSM transitions, stop-command delays, and DVSim fixes; addressed several DV and TODO cleanup items. Result: improved security posture, higher reliability, and clearer documentation, enabling safer production deployment and faster future iterations.
December 2024
11 Commits • 2 Features
Dec 1, 2024December 2024 monthly summary for lowRISC/opentitan: Delivered key HMAC improvements and verification enhancements focusing on security, correctness, and DV maturity. Gated DIGEST and MSG_LENGTH updates to IDLE to prevent secret leakage; added data-clearing assertions and wipe-secret documentation updates. Expanded verification environment for HMAC reliability with FSM stress testing, timing-related delays, reset handling during message processing, and enhanced simulator compatibility. Strengthened DV coverage with new tests for FSM transitions, stop-command delays, and DVSim fixes; addressed several DV and TODO cleanup items. Result: improved security posture, higher reliability, and clearer documentation, enabling safer production deployment and faster future iterations.
November 2024
4 Commits • 2 Features
Nov 1, 20242024-11 monthly summary for lowRISC/opentitan focused on HMAC reliability and verification improvements. Delivered hardware-facing fixes to improve HMAC stability across context-switches, refactored the SystemVerilog verification environment for better maintainability, and updated documentation to guide arbitrary key-length configurations. These efforts contributed to more reliable cryptographic operations, simplified DV maintenance, and clearer guidance for developers configuring HMACs.
4 Commits • 2 Features
Nov 1, 20242024-11 monthly summary for lowRISC/opentitan focused on HMAC reliability and verification improvements. Delivered hardware-facing fixes to improve HMAC stability across context-switches, refactored the SystemVerilog verification environment for better maintainability, and updated documentation to guide arbitrary key-length configurations. These efforts contributed to more reliable cryptographic operations, simplified DV maintenance, and clearer guidance for developers configuring HMACs.
November 2024
October 2024
1 Commits
Oct 1, 20242024-10 Monthly summary for lowRISC/opentitan focused on stabilizing the HMAC programming workflow by addressing an RTL bug related to CMD.hash_stop. Delivered a documented software workaround in the HMAC Programmer Guide, including delays and triggering CMD.hash_process to ensure correct hardware state transitions. The work is aligned with Issue #24767 and PR #24944, and includes documentation updates to related guides (Save and Restore SW guide).
October 2024
1 Commits
Oct 1, 20242024-10 Monthly summary for lowRISC/opentitan focused on stabilizing the HMAC programming workflow by addressing an RTL bug related to CMD.hash_stop. Delivered a documented software workaround in the HMAC Programmer Guide, including delays and triggering CMD.hash_process to ensure correct hardware state transitions. The work is aligned with Issue #24767 and PR #24944, and includes documentation updates to related guides (Save and Restore SW guide).
July 2024
1 Commits • 1 Features
Jul 1, 2024July 2024 monthly summary for lowRISC/opentitan focusing on feature delivery and DV workflow enhancements. Delivered GUI Debug Mode for the OpenTitan simulator, enabling breakpoints, live data viewing, and transaction recording in Xcelium. No major bug fixes were recorded this month; the focus was on delivering a robust debugging feature and validating DV workflows. Impact: improved debugging efficiency for hardware verification teams and faster issue reproduction. Technologies/skills demonstrated: hardware verification, GUI integration with Xcelium, DV practices, and Git-based collaboration on the OpenTitan project.
1 Commits • 1 Features
Jul 1, 2024July 2024 monthly summary for lowRISC/opentitan focusing on feature delivery and DV workflow enhancements. Delivered GUI Debug Mode for the OpenTitan simulator, enabling breakpoints, live data viewing, and transaction recording in Xcelium. No major bug fixes were recorded this month; the focus was on delivering a robust debugging feature and validating DV workflows. Impact: improved debugging efficiency for hardware verification teams and faster issue reproduction. Technologies/skills demonstrated: hardware verification, GUI integration with Xcelium, DV practices, and Git-based collaboration on the OpenTitan project.
July 2024
Activity
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Quality Metrics
Correctness87.0%
Maintainability87.6%
Architecture84.8%
Performance78.2%
AI Usage20.0%
Skills & Technologies
Programming Languages
CElispHJSONHjsonMarkdownPythonSystemVerilogTcl
Technical Skills
AXIAccess ControlAssertion CoverageCode Quality AssuranceCommand-line InterfaceCoverage AnalysisDUT IntegrationDebuggingDesign VerificationDigital DesignDocumentationDriver DevelopmentEmbedded SystemsFPGA DevelopmentFirmware Development
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