lowRISC/opentitan
Oct 2024 – Oct 2025
13 Months active
Languages Used
HjsonMarkdownPythonSVGSystemVerilogCC++HCL
Technical Skills
Backend DevelopmentCode GenerationCode RefactoringDesign VerificationDigital DesignDistributed Computing
Robert Schilling
PROFILE
Robert Schilling
Ryan Schilling contributed to the lowRISC/opentitan repository by engineering robust hardware security and integration features across the RTL and system design stack. He developed and integrated Register Access Control Logic (RACL) and advanced IP templating, enabling scalable, policy-driven access control and automated hardware generation. Using SystemVerilog, Python, and extensive build system automation, Ryan improved device-tree integration, formal verification, and testbench realism, while enhancing maintainability through code refactoring and parameterization. His work addressed security, reliability, and configurability, supporting multitop hardware, secure key management, and scalable interrupt handling, resulting in a more maintainable and secure hardware development workflow.
Overall Statistics
Feature vs Bugs
70%Features
Repository Contributions
569Total
Bugs
91
Commits
569
Features
212
Lines of code
527,930
Activity Months13
Your Network
108 people
Work History
October 2025
20 Commits • 7 Features
Oct 1, 2025In October 2025, the opentitan effort delivered a set of cross-cutting features and reliability improvements spanning RTL, DV, tooling, and device-tree handling. The work improves debug policy governance, expands hardware configuration support, and strengthens maintainability, verification, and documentation to enable faster integration of next hardware iterations and reduced risk across the deployment pipeline.
20 Commits • 7 Features
Oct 1, 2025In October 2025, the opentitan effort delivered a set of cross-cutting features and reliability improvements spanning RTL, DV, tooling, and device-tree handling. The work improves debug policy governance, expands hardware configuration support, and strengthens maintainability, verification, and documentation to enable faster integration of next hardware iterations and reduced risk across the deployment pipeline.
October 2025
September 2025
68 Commits • 12 Features
Sep 1, 2025September 2025 monthly summary for opentitan focused on security hardening, RTL improvements, and DT integration, delivering concrete features, robust CI validation, and enhanced key management. The month advanced hardware-software integration, improved security posture, and maintainability through Device Tree migrations and CI checks.
September 2025
68 Commits • 12 Features
Sep 1, 2025September 2025 monthly summary for opentitan focused on security hardening, RTL improvements, and DT integration, delivering concrete features, robust CI validation, and enhanced key management. The month advanced hardware-software integration, improved security posture, and maintainability through Device Tree migrations and CI checks.
August 2025
44 Commits • 21 Features
Aug 1, 2025August 2025: Delivered scalability, reliability, and security improvements across opentitan, focusing on interrupt handling, IP generation tooling, and OTP/secrets hygiene. Enabled 1024-source interrupt support, extended dtgen/ipgen types to uint16, standardized ipgen IP generation, and refactored core/topgen components for maintainability. Strengthened build-time quality, linting, and secret management to reduce risk and accelerate future feature work, while improving OTP/map integration and alert rendering for Darjeeling and EARLGREY. Implemented PRNG seeding improvements and RACL sizing for better hardware scalability and security, with targeted refactors to core files and primitives.
44 Commits • 21 Features
Aug 1, 2025August 2025: Delivered scalability, reliability, and security improvements across opentitan, focusing on interrupt handling, IP generation tooling, and OTP/secrets hygiene. Enabled 1024-source interrupt support, extended dtgen/ipgen types to uint16, standardized ipgen IP generation, and refactored core/topgen components for maintainability. Strengthened build-time quality, linting, and secret management to reduce risk and accelerate future feature work, while improving OTP/map integration and alert rendering for Darjeeling and EARLGREY. Implemented PRNG seeding improvements and RACL sizing for better hardware scalability and security, with targeted refactors to core files and primitives.
August 2025
July 2025
36 Commits • 12 Features
Jul 1, 2025July 2025 monthly summary for lowRISC/openTitan focused on delivering measurable business value through a mix of timing/configuration improvements, security hardening, and DV/testbench realism across RTL, IPs, and top-level integration. The month emphasizes configurable timing controls, improved observability, and robust build/quality hygiene to accelerate DV cycles and reduce integration risk.
July 2025
36 Commits • 12 Features
Jul 1, 2025July 2025 monthly summary for lowRISC/openTitan focused on delivering measurable business value through a mix of timing/configuration improvements, security hardening, and DV/testbench realism across RTL, IPs, and top-level integration. The month emphasizes configurable timing controls, improved observability, and robust build/quality hygiene to accelerate DV cycles and reduce integration risk.
June 2025
30 Commits • 11 Features
Jun 1, 2025June 2025 monthly summary for lowRISC/opentitan: Delivered notable feature enhancements in ac_range_check and entropy_src, applied corefiles improvements, and substantial RTL/test reliability fixes. Focused on reliability, security, and maintainability with broader test coverage through multitop test porting, lint/config hardening, and build workflow improvements across hardware and software stacks.
30 Commits • 11 Features
Jun 1, 2025June 2025 monthly summary for lowRISC/opentitan: Delivered notable feature enhancements in ac_range_check and entropy_src, applied corefiles improvements, and substantial RTL/test reliability fixes. Focused on reliability, security, and maintainability with broader test coverage through multitop test porting, lint/config hardening, and build workflow improvements across hardware and software stacks.
June 2025
May 2025
13 Commits • 3 Features
May 1, 2025May 2025 monthly summary for lowRISC/opentitan: Delivered critical RTL correctness fixes, formal verification improvements, and tooling/maintenance updates. Key outcomes include updated DMA documentation; RTL fixes for OTP address calculation and QE behavior; Xcelium simulator warning resolved; Ibex core upgraded with formal verification improvements and Nix-based env; tooling and RTL cleanup improving module detection, parameter defaults, and linting waivers. These changes reduce RTL risk, improve validation accuracy, accelerate onboarding for formal flows, and enhance overall development reliability.
May 2025
13 Commits • 3 Features
May 1, 2025May 2025 monthly summary for lowRISC/opentitan: Delivered critical RTL correctness fixes, formal verification improvements, and tooling/maintenance updates. Key outcomes include updated DMA documentation; RTL fixes for OTP address calculation and QE behavior; Xcelium simulator warning resolved; Ibex core upgraded with formal verification improvements and Nix-based env; tooling and RTL cleanup improving module detection, parameter defaults, and linting waivers. These changes reduce RTL risk, improve validation accuracy, accelerate onboarding for formal flows, and enhance overall development reliability.
April 2025
11 Commits • 3 Features
Apr 1, 2025April 2025 monthly summary for lowRISC/opentitan focusing on security, traceability, and maintainability improvements across core peripherals and hardware IP packaging.
11 Commits • 3 Features
Apr 1, 2025April 2025 monthly summary for lowRISC/opentitan focusing on security, traceability, and maintainability improvements across core peripherals and hardware IP packaging.
April 2025
March 2025
41 Commits • 17 Features
Mar 1, 2025March 2025: Delivered end-to-end IP templating and ipgen integration for GPIO and PWM, enabling templated IP blocks and automated top regeneration. Implemented configurable hardware parameters (outstanding SRAM transactions, PWM channels) and advanced IP hygiene (optional flash-key interface in otp_ctrl, always-on late debug). Updated the ibex core to the latest upstream and performed RTL/lint improvements to boost reliability and synthesis safety. Strengthened the ipgen/topgen pipeline with robust handling of undefined modules and unique IP listings, and improved build tooling and cross-platform compatibility. These changes reduce manual collateral, accelerate IP reuse, and enhance traceability and debugging across the SoC.
March 2025
41 Commits • 17 Features
Mar 1, 2025March 2025: Delivered end-to-end IP templating and ipgen integration for GPIO and PWM, enabling templated IP blocks and automated top regeneration. Implemented configurable hardware parameters (outstanding SRAM transactions, PWM channels) and advanced IP hygiene (optional flash-key interface in otp_ctrl, always-on late debug). Updated the ibex core to the latest upstream and performed RTL/lint improvements to boost reliability and synthesis safety. Strengthened the ipgen/topgen pipeline with robust handling of undefined modules and unique IP listings, and improved build tooling and cross-platform compatibility. These changes reduce manual collateral, accelerate IP reuse, and enhance traceability and debugging across the SoC.
February 2025
56 Commits • 21 Features
Feb 1, 2025February 2025 (2025-02) monthly summary for lowRISC/opentitan focusing on business value and technical excellence. Delivered substantial enhancements across AC range checks, RACL integration, risk-reducing bug fixes, and infrastructure improvements enabling security features and reliable deployment. Implemented robust top-level regeneration and topology updates to reflect ongoing changes, improved test coverage, and expanded hardware capabilities.
56 Commits • 21 Features
Feb 1, 2025February 2025 (2025-02) monthly summary for lowRISC/opentitan focusing on business value and technical excellence. Delivered substantial enhancements across AC range checks, RACL integration, risk-reducing bug fixes, and infrastructure improvements enabling security features and reliable deployment. Implemented robust top-level regeneration and topology updates to reflect ongoing changes, improved test coverage, and expanded hardware capabilities.
February 2025
January 2025
121 Commits • 53 Features
Jan 1, 2025Summary for 2025-01: Delivered a suite of HDL, IP-generation, and system integration improvements across the OpenTitan repository, emphasizing performance, security, and maintainability. Key features include enabling Ibex pipelining to boost instruction throughput, standardizing HDL semantics with localparam usage, expanding Darjeeling user-bit support (27 and 28 bits) and aligning CSB width to NumCS, plus exposing I2C RAM configuration at the top level. Major hardware security and reliability work includes RACL integration across modules with RAC L protections, RACL-protected TLUL adapters, and re-generation of top designs via ipgen for rv_core_ibex; these changes enable safer routing and more predictable security policies. Observability and validation gains were achieved by adding missing incoming_alert definitions, augmenting topgen validations, and applying ASSERT_KNOWN to new IP outputs across multiple modules, as well as templating RTL/DV files to simplify reuse. Foundational work in build and naming consistency (rename/refactor of alert_handler_pkg, module_instance_name handling, and topgen utilities) lays groundwork for easier maintenance and scalable growth. Business value includes higher throughput, stronger security posture, faster onboarding of new IP, and reduced maintenance burden through templating and standardized HDL semantics.
January 2025
121 Commits • 53 Features
Jan 1, 2025Summary for 2025-01: Delivered a suite of HDL, IP-generation, and system integration improvements across the OpenTitan repository, emphasizing performance, security, and maintainability. Key features include enabling Ibex pipelining to boost instruction throughput, standardizing HDL semantics with localparam usage, expanding Darjeeling user-bit support (27 and 28 bits) and aligning CSB width to NumCS, plus exposing I2C RAM configuration at the top level. Major hardware security and reliability work includes RACL integration across modules with RAC L protections, RACL-protected TLUL adapters, and re-generation of top designs via ipgen for rv_core_ibex; these changes enable safer routing and more predictable security policies. Observability and validation gains were achieved by adding missing incoming_alert definitions, augmenting topgen validations, and applying ASSERT_KNOWN to new IP outputs across multiple modules, as well as templating RTL/DV files to simplify reuse. Foundational work in build and naming consistency (rename/refactor of alert_handler_pkg, module_instance_name handling, and topgen utilities) lays groundwork for easier maintenance and scalable growth. Business value includes higher throughput, stronger security posture, faster onboarding of new IP, and reduced maintenance burden through templating and standardized HDL semantics.
December 2024
38 Commits • 18 Features
Dec 1, 2024December 2024 performance snapshot for lowRISC/opentitan. Delivered security, build readiness, and RTL/SoC integration improvements across the OpenTitan repository, with a focus on enabling secure hardware interactions, scalable build processes for Darjeeling, and enhanced debugging support. Key features were implemented across reggen, rv_core_ibex, Topgen, and memory/RAM subsystems, along with substantial DFT and peripheral enhancements. Resolved critical corefile issues and improved code quality with lint fixes, contributing to more reliable releases and faster iteration cycles.
38 Commits • 18 Features
Dec 1, 2024December 2024 performance snapshot for lowRISC/opentitan. Delivered security, build readiness, and RTL/SoC integration improvements across the OpenTitan repository, with a focus on enabling secure hardware interactions, scalable build processes for Darjeeling, and enhanced debugging support. Key features were implemented across reggen, rv_core_ibex, Topgen, and memory/RAM subsystems, along with substantial DFT and peripheral enhancements. Resolved critical corefile issues and improved code quality with lint fixes, contributing to more reliable releases and faster iteration cycles.
December 2024
November 2024
78 Commits • 29 Features
Nov 1, 2024November 2024 monthly summary for lowRISC/opentitan focusing on business value, reliability, and technical depth. The month emphasized completing end-to-end Darjeeling integration with the topgen/template flow, expanding IP generation and parameterization to improve configurability, and enhancing observability and debug capabilities. Deliveries targeted reduction of risk, faster integration, and scalable hardware configuration across targets.
November 2024
78 Commits • 29 Features
Nov 1, 2024November 2024 monthly summary for lowRISC/opentitan focusing on business value, reliability, and technical depth. The month emphasized completing end-to-end Darjeeling integration with the topgen/template flow, expanding IP generation and parameterization to improve configurability, and enhancing observability and debug capabilities. Deliveries targeted reduction of risk, faster integration, and scalable hardware configuration across targets.
October 2024
13 Commits • 5 Features
Oct 1, 2024October 2024 monthly summary for lowRISC/opentitan focused on delivering reliable hardware verification tooling, expanding automation, and improving maintainability. The team emphasized features that enable scalable simulation, robust alerting, and accelerated cryptographic IP integration, while addressing verification environment compatibility and documentation alignment. The work balanced performance improvements with security and correctness fixes across the RTL/DV stack.
13 Commits • 5 Features
Oct 1, 2024October 2024 monthly summary for lowRISC/opentitan focused on delivering reliable hardware verification tooling, expanding automation, and improving maintainability. The team emphasized features that enable scalable simulation, robust alerting, and accelerated cryptographic IP integration, while addressing verification environment compatibility and documentation alignment. The work balanced performance improvements with security and correctness fixes across the RTL/DV stack.
October 2024
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Quality Metrics
Correctness94.0%
Maintainability93.8%
Architecture93.0%
Performance87.4%
AI Usage20.0%
Skills & Technologies
Programming Languages
Jinja Jinja2AssemblyBUILDBashBazelBzlCC++Core
Technical Skills
AES ImplementationASIC DesignAccess ControlAccess Control LogicArbiter DesignAssertion WritingAssertion-Based VerificationAssertionsBackend DevelopmentBazelBuild SystemBuild System ConfigurationBuild SystemsC ProgrammingC/C++
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