lowRISC/opentitan
Apr 2024 – Feb 2026
14 Months active
Languages Used
CPythonHJSONYAMLBUILDBashBzlC++
Technical Skills
C programmingPython scriptingembedded systemshardware testingtesting frameworksbuild systems
Douglas Reis
PROFILE
Douglas Reis
Doreis contributed to the lowRISC/opentitan repository by engineering robust test automation, hardware validation, and build system improvements over 14 months. Their work included integrating nightly CI workflows, expanding silicon validation coverage, and refactoring test infrastructure to accelerate feedback and reduce regression risk. Doreis centralized exporter interfaces, enhanced register modeling, and enriched SystemRDL metadata, supporting automated code generation and downstream tooling. Using C, Python, and Bazel, they improved build reliability, documentation clarity, and test plan management, addressing both feature development and critical bug fixes. The depth of their contributions strengthened maintainability, reproducibility, and onboarding across hardware-software integration and verification pipelines.
Overall Statistics
Feature vs Bugs
69%Features
Repository Contributions
117Total
Bugs
19
Commits
117
Features
42
Lines of code
3,981
Activity Months14
Your Network
124 peopleWork History
February 2026
2 Commits • 1 Features
Feb 1, 2026February 2026: OpenTitan build stability and documentation consistency improvements in lowRISC/opentitan. Delivered Software Build Stability and Documentation Consistency Improvements by (1) refactoring the build collateral script for clarity, robust error handling, and logging; (2) expanding documentation to clarify sw_type_e and ensure consistency across top-level designs. Implemented via commits 41a6bda4da804be3d6d0004d5f8e5dfe9838cd17 and 75229e13091800c299234ef5755b5a71839f88a0. No major bugs fixed this month. Business value: reduced build failures, improved maintainability, and faster onboarding for new contributors and backport processes. Skills demonstrated: scripting/refactor, logging, documentation discipline, and cross-team collaboration.
2 Commits • 1 Features
Feb 1, 2026February 2026: OpenTitan build stability and documentation consistency improvements in lowRISC/opentitan. Delivered Software Build Stability and Documentation Consistency Improvements by (1) refactoring the build collateral script for clarity, robust error handling, and logging; (2) expanding documentation to clarify sw_type_e and ensure consistency across top-level designs. Implemented via commits 41a6bda4da804be3d6d0004d5f8e5dfe9838cd17 and 75229e13091800c299234ef5755b5a71839f88a0. No major bugs fixed this month. Business value: reduced build failures, improved maintainability, and faster onboarding for new contributors and backport processes. Skills demonstrated: scripting/refactor, logging, documentation discipline, and cross-team collaboration.
February 2026
January 2026
3 Commits • 1 Features
Jan 1, 2026January 2026 was focused on stabilizing OpenTitan builds across environments and reinforcing reproducibility. Key work included portability improvements to the build environment (dvsim shell invocation updated to /usr/bin/env bash) and Bazel cquery enhancements to locate darjeeling artifacts on the master branch. A reproducibility bug related to build_seed handling in build_sw_collateral_for_sim.py was addressed by replicating prior changes to align with sim.mk, improving build determinism and reliability for CI in master.
January 2026
3 Commits • 1 Features
Jan 1, 2026January 2026 was focused on stabilizing OpenTitan builds across environments and reinforcing reproducibility. Key work included portability improvements to the build environment (dvsim shell invocation updated to /usr/bin/env bash) and Bazel cquery enhancements to locate darjeeling artifacts on the master branch. A reproducibility bug related to build_seed handling in build_sw_collateral_for_sim.py was addressed by replicating prior changes to align with sim.mk, improving build determinism and reliability for CI in master.
November 2025
3 Commits • 1 Features
Nov 1, 2025Month: 2025-11 — Focused on expanding hardware test coverage, automating validation in CI, and stabilizing critical bootstraps for TPM/SPI paths in opentitan. Delivered automated TPM tests that verify hardware registers and run in CI without manual tagging; reduced bootstrap glitches by tuning CW340 SPI clock speed in response to external wiring capacitance. These changes increase test coverage, speed feedback loops, and improve CI reliability for hardware validation.
3 Commits • 1 Features
Nov 1, 2025Month: 2025-11 — Focused on expanding hardware test coverage, automating validation in CI, and stabilizing critical bootstraps for TPM/SPI paths in opentitan. Delivered automated TPM tests that verify hardware registers and run in CI without manual tagging; reduced bootstrap glitches by tuning CW340 SPI clock speed in response to external wiring capacitance. These changes increase test coverage, speed feedback loops, and improve CI reliability for hardware validation.
November 2025
October 2025
1 Commits • 1 Features
Oct 1, 2025Monthly summary for 2025-10: Delivered CW340 Getting Started Guide Improvement in the lowRISC/opentitan repository to improve onboarding reliability. The update clarifies jumper settings, corrects command examples, and enhances debugging instructions, backed by a doc-focused commit. No major bugs fixed this month; the work prioritized documentation quality and developer experience, enabling faster CW340 integration and fewer setup errors.
October 2025
1 Commits • 1 Features
Oct 1, 2025Monthly summary for 2025-10: Delivered CW340 Getting Started Guide Improvement in the lowRISC/opentitan repository to improve onboarding reliability. The update clarifies jumper settings, corrects command examples, and enhances debugging instructions, backed by a doc-focused commit. No major bugs fixed this month; the work prioritized documentation quality and developer experience, enabling faster CW340 integration and fewer setup errors.
July 2025
36 Commits • 11 Features
Jul 1, 2025July 2025 was marked by a focused architectural refactor, quality improvements, and tooling enhancements across lowRISC/opentitan. Key architectural work centralized the exporter and standardized its interface, enabling safer evolution and easier cross-module integration. Register modeling received substantial enhancements to support external properties, multireg mappings to register arrays, and richer metadata, improving downstream code generation and hardware modeling. UDP custom properties were added to RegGen/SystemRdl (mubi, Hwre, and shadowed), accompanied by necessary Bazel updates to reflect repository changes. Testplantool and related test planning tooling were expanded with new utilities for manipulating test plans, filtering/exporting testpoints and fields, and improved grouping; Bazel build integration was strengthened for the toolchain. Across the codebase, formatting and style consistency were improved via ruff formatting and autoformatting, contributing to long-term maintainability and reviewer efficiency. A number of targeted bug fixes were completed to improve correctness and stability, including Reggen/SystemRdl SW/HW access mapping, RegGen/KMAC register configuration, TestPlanLib unique list handling, LC_CTRL STATE description typos, and improved defaults for optional fields in TestPlanTool.
36 Commits • 11 Features
Jul 1, 2025July 2025 was marked by a focused architectural refactor, quality improvements, and tooling enhancements across lowRISC/opentitan. Key architectural work centralized the exporter and standardized its interface, enabling safer evolution and easier cross-module integration. Register modeling received substantial enhancements to support external properties, multireg mappings to register arrays, and richer metadata, improving downstream code generation and hardware modeling. UDP custom properties were added to RegGen/SystemRdl (mubi, Hwre, and shadowed), accompanied by necessary Bazel updates to reflect repository changes. Testplantool and related test planning tooling were expanded with new utilities for manipulating test plans, filtering/exporting testpoints and fields, and improved grouping; Bazel build integration was strengthened for the toolchain. Across the codebase, formatting and style consistency were improved via ruff formatting and autoformatting, contributing to long-term maintainability and reviewer efficiency. A number of targeted bug fixes were completed to improve correctness and stability, including Reggen/SystemRdl SW/HW access mapping, RegGen/KMAC register configuration, TestPlanLib unique list handling, LC_CTRL STATE description typos, and improved defaults for optional fields in TestPlanTool.
July 2025
June 2025
7 Commits • 1 Features
Jun 1, 2025June 2025 monthly summary for lowRISC/opentitan: Delivered SystemRDL Exporter Integration and Field Metadata Enrichment. Consolidated the SystemRDL exporter into the Bazel build, added mappings and properties to fields for SystemRDL generation, including access properties, descriptions, reset values, and hardware/software modification notifications. This enables automated SystemRDL generation, richer field metadata, and stronger downstream tooling support. Commit activity during the period focused on build stability and metadata propagation (lint fixes, Bazel declaration, and field-property enhancements).
June 2025
7 Commits • 1 Features
Jun 1, 2025June 2025 monthly summary for lowRISC/opentitan: Delivered SystemRDL Exporter Integration and Field Metadata Enrichment. Consolidated the SystemRDL exporter into the Bazel build, added mappings and properties to fields for SystemRDL generation, including access properties, descriptions, reset values, and hardware/software modification notifications. This enables automated SystemRDL generation, richer field metadata, and stronger downstream tooling support. Commit activity during the period focused on build stability and metadata propagation (lint fixes, Bazel declaration, and field-property enhancements).
April 2025
5 Commits • 1 Features
Apr 1, 2025April 2025 monthly summary for lowRISC/opentitan: Key features delivered: - Chip PLIC All IRQs Testing Enhancements: Added chip_plic_all_irqs_10 configuration and fixed test image path to enable testing of interrupt controller functionality across different IRQ IDs in device verification environments. (Commit: 98b04756737d3a6ed1c9bf509dc64879d2bd274a) Major bugs fixed: - Build/Test Path Fix for Chip Simulation: Corrected Bazel build path in chip_sim_cfg.hjson for darjeeling and SRAM configurations to reference the proper SRAM scrambled access test target, reducing build/test execution issues. (Commit: caecdcbe1174fd8876cb57c20be38e7a35c5b2d4) - RSTMGR Alert Info Test Cleanup and Consistency: Cleanup and consistency improvements for rstmgr_alert_info_test.c, including removal of unnecessary OTP alert exception handling, fixing unused variable warnings, and aligning variable naming with the project style guide. (Commits: 86925e726c539aed392fb126b61f58a650b70af9; a199fc8d717fb0dd7b377792a240a467f5906835; d2cc8d5278477b212112eb538491353cdbac3700) Overall impact and accomplishments: - Enhanced test coverage and reliability for the interrupt controller, improved CI/build stability for chip simulations, and elevated code quality of device verification tests, contributing to faster defect detection and a more maintainable verification suite. Technologies/skills demonstrated: - Bazel/Chip-level build configuration, device verification (DV) workflows, C and test script hygiene, test path debugging, and adherence to a consistent style guide for test code.
5 Commits • 1 Features
Apr 1, 2025April 2025 monthly summary for lowRISC/opentitan: Key features delivered: - Chip PLIC All IRQs Testing Enhancements: Added chip_plic_all_irqs_10 configuration and fixed test image path to enable testing of interrupt controller functionality across different IRQ IDs in device verification environments. (Commit: 98b04756737d3a6ed1c9bf509dc64879d2bd274a) Major bugs fixed: - Build/Test Path Fix for Chip Simulation: Corrected Bazel build path in chip_sim_cfg.hjson for darjeeling and SRAM configurations to reference the proper SRAM scrambled access test target, reducing build/test execution issues. (Commit: caecdcbe1174fd8876cb57c20be38e7a35c5b2d4) - RSTMGR Alert Info Test Cleanup and Consistency: Cleanup and consistency improvements for rstmgr_alert_info_test.c, including removal of unnecessary OTP alert exception handling, fixing unused variable warnings, and aligning variable naming with the project style guide. (Commits: 86925e726c539aed392fb126b61f58a650b70af9; a199fc8d717fb0dd7b377792a240a467f5906835; d2cc8d5278477b212112eb538491353cdbac3700) Overall impact and accomplishments: - Enhanced test coverage and reliability for the interrupt controller, improved CI/build stability for chip simulations, and elevated code quality of device verification tests, contributing to faster defect detection and a more maintainable verification suite. Technologies/skills demonstrated: - Bazel/Chip-level build configuration, device verification (DV) workflows, C and test script hygiene, test path debugging, and adherence to a consistent style guide for test code.
April 2025
March 2025
1 Commits
Mar 1, 2025March 2025 monthly summary focusing on bug fixes and reliability improvements in the opentitan verification pipeline. No new features delivered this month; main effort targeted at correcting build target path resolution in chip simulation configuration to ensure device reset tests use the correct image.
March 2025
1 Commits
Mar 1, 2025March 2025 monthly summary focusing on bug fixes and reliability improvements in the opentitan verification pipeline. No new features delivered this month; main effort targeted at correcting build target path resolution in chip simulation configuration to ensure device reset tests use the correct image.
January 2025
2 Commits • 1 Features
Jan 1, 2025Monthly summary for 2025-01 focused on business value and technical achievements in lowRISC/opentitan. Key features delivered: - Test plan NA marking for SiVal test (USB device test plan). Mark the 'sof test' as Not Applicable for SiVal. This is a test-plan configuration change that does not alter code logic but aligns test coverage with closed-source validation, reducing false expectations in CI. Major bugs fixed: - PWM smoketest synchronization fix. Ensure the host waits for the 'Running' message from ottf before proceeding, adding a new wait condition to improve reliability during test initialization and reduce flakiness. Overall impact and accomplishments: - Improved test stability and CI reliability, enabling faster feedback and reducing flaky failures in hardware validation tests. - Proper alignment of test plans with SiVal validation, preserving coverage without modifying production code. - Enhanced maintainability of the test harness and risk-free integration due to minimal, well-scoped changes. Technologies/skills demonstrated: - Test-plan configuration and test automation, USB device testing, PWM smoketest, and test harness synchronization. - Version control traceability with commit references for auditability and reproducibility. Top 3-5 achievements: - Marked SOF test as NA for SiVal in the USB device test plan (commit: 2397088c4530f4edc6b7b89b2763c852ecb0e73e). - Fixed PWM smoketest flakiness by adding a wait for the 'Running' signal from ottf (commit: 175e0a65531a276c40ad7caff4cd71577314dd4d).
2 Commits • 1 Features
Jan 1, 2025Monthly summary for 2025-01 focused on business value and technical achievements in lowRISC/opentitan. Key features delivered: - Test plan NA marking for SiVal test (USB device test plan). Mark the 'sof test' as Not Applicable for SiVal. This is a test-plan configuration change that does not alter code logic but aligns test coverage with closed-source validation, reducing false expectations in CI. Major bugs fixed: - PWM smoketest synchronization fix. Ensure the host waits for the 'Running' message from ottf before proceeding, adding a new wait condition to improve reliability during test initialization and reduce flakiness. Overall impact and accomplishments: - Improved test stability and CI reliability, enabling faster feedback and reducing flaky failures in hardware validation tests. - Proper alignment of test plans with SiVal validation, preserving coverage without modifying production code. - Enhanced maintainability of the test harness and risk-free integration due to minimal, well-scoped changes. Technologies/skills demonstrated: - Test-plan configuration and test automation, USB device testing, PWM smoketest, and test harness synchronization. - Version control traceability with commit references for auditability and reproducibility. Top 3-5 achievements: - Marked SOF test as NA for SiVal in the USB device test plan (commit: 2397088c4530f4edc6b7b89b2763c852ecb0e73e). - Fixed PWM smoketest flakiness by adding a wait for the 'Running' signal from ottf (commit: 175e0a65531a276c40ad7caff4cd71577314dd4d).
January 2025
December 2024
26 Commits • 10 Features
Dec 1, 2024December 2024 monthly summary for lowRISC/opentitan focused on strengthening test automation, hardware validation coverage, and CI reliability to accelerate feedback and manufacturing readiness. Key efforts spanned testplan integration, hardware re-targeting for validation, nightly test workflows on CW340, and foundational transport support for opentitanlib, delivering tangible business value in faster, more reliable silicon validation.
December 2024
26 Commits • 10 Features
Dec 1, 2024December 2024 monthly summary for lowRISC/opentitan focused on strengthening test automation, hardware validation coverage, and CI reliability to accelerate feedback and manufacturing readiness. Key efforts spanned testplan integration, hardware re-targeting for validation, nightly test workflows on CW340, and foundational transport support for opentitanlib, delivering tangible business value in faster, more reliable silicon validation.
November 2024
21 Commits • 10 Features
Nov 1, 2024November 2024 focused on stabilizing and extending the OpenTitan CI/Nightly pipeline and SiVal validation, delivering targeted features and fixes that reduce nightly noise and increase hardware/software validation coverage. Key improvements include enhanced nightly tooling, stabilized reporting, and expanded SiVal test plans and environments, complemented by new PWM and USBDev test harnesses and updated chip environments for broader end-to-end validation. The changes reduced nightly flakiness, accelerated feedback cycles, and broadened validation coverage across EarlGrey, macronix (spi_host), PWM, and USBDev scenarios, enabling faster, more reliable hardware-software integration.
21 Commits • 10 Features
Nov 1, 2024November 2024 focused on stabilizing and extending the OpenTitan CI/Nightly pipeline and SiVal validation, delivering targeted features and fixes that reduce nightly noise and increase hardware/software validation coverage. Key improvements include enhanced nightly tooling, stabilized reporting, and expanded SiVal test plans and environments, complemented by new PWM and USBDev test harnesses and updated chip environments for broader end-to-end validation. The changes reduced nightly flakiness, accelerated feedback cycles, and broadened validation coverage across EarlGrey, macronix (spi_host), PWM, and USBDev scenarios, enabling faster, more reliable hardware-software integration.
November 2024
October 2024
1 Commits • 1 Features
Oct 1, 2024Month: 2024-10 — Delivered a new nightly CI workflow for the SiVal project in lowRISC/opentitan, establishing automated daily validation to strengthen test coverage and reliability. This work automates checkout, dependency installation, hyperdebug firmware update, and ROM/ROM_EXT boot tests, enabling consistent, early detection of regressions and faster feedback on SiVal functionality.
October 2024
1 Commits • 1 Features
Oct 1, 2024Month: 2024-10 — Delivered a new nightly CI workflow for the SiVal project in lowRISC/opentitan, establishing automated daily validation to strengthen test coverage and reliability. This work automates checkout, dependency installation, hyperdebug firmware update, and ROM/ROM_EXT boot tests, enabling consistent, early detection of regressions and faster feedback on SiVal functionality.
May 2024
7 Commits • 1 Features
May 1, 2024Monthly summary for 2024-05 focused on delivering a robust Power Management and Sensor Control testing framework for lowRISC/opentitan. The month culminated in significant improvements to test coverage, maintainability, and documentation, enabling faster validation of complex power and sensor workflows across ROM_EXT/OTP scenarios. Delivered code quality enhancements and clearer test plans, strengthening the hardware validation pipeline and reducing regression risk.
7 Commits • 1 Features
May 1, 2024Monthly summary for 2024-05 focused on delivering a robust Power Management and Sensor Control testing framework for lowRISC/opentitan. The month culminated in significant improvements to test coverage, maintainability, and documentation, enabling faster validation of complex power and sensor workflows across ROM_EXT/OTP scenarios. Delivered code quality enhancements and clearer test plans, strengthening the hardware validation pipeline and reducing regression risk.
May 2024
April 2024
2 Commits • 2 Features
Apr 1, 2024April 2024 monthly summary for lowRISC/opentitan focusing on test infrastructure and verification coverage. Delivered two high-impact testing enhancements to strengthen PWM and I2C test validation on silicon, expanding coverage, improving realism, and enabling earlier defect detection. These efforts contribute to faster verification cycles and reduced risk before silicon tapeouts.
April 2024
2 Commits • 2 Features
Apr 1, 2024April 2024 monthly summary for lowRISC/opentitan focusing on test infrastructure and verification coverage. Delivered two high-impact testing enhancements to strengthen PWM and I2C test validation on silicon, expanding coverage, improving realism, and enabling earlier defect detection. These efforts contribute to faster verification cycles and reduced risk before silicon tapeouts.
Activity
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Quality Metrics
Correctness91.0%
Maintainability90.0%
Architecture88.6%
Performance83.2%
AI Usage20.2%
Skills & Technologies
Programming Languages
BUILDBashBazelBzlCC++HJSONHjsonJSONMakefile
Technical Skills
API DesignBazelBitbangingBuild System ConfigurationBuild System IntegrationBuild SystemsBuild automationC ProgrammingC programmingCI/CDCLI DevelopmentCloud StorageCode FormattingCode GenerationCode Organization
Repositories Contributed To
Overview of all repositories you've contributed to across your timeline