zephyrproject-rtos/trusted-firmware-a
Jan 2025 – Jan 2025
1 Month active
Languages Used
CMakefilerst
Technical Skills
ARM ArchitectureBuild System ConfigurationBuild SystemsDriver DevelopmentEmbedded SystemsEmbedded Systems Development
Olivier Deprez
PROFILE
Olivier Deprez
Worked on the zephyrproject-rtos/trusted-firmware-a repository, focusing on security hardening and build system flexibility for ARM-based embedded systems. Delivered a flexible build configuration that enables RME and PIE with Pointer Authentication, improving support for modern protection features. Addressed memory mapping alignment by updating BL2 to use EL3_PAS macros, ensuring consistent permissions when RME is enabled. Enhanced SMMU reliability by enforcing the correct programming order for CR0.GPCEN and ACCESSEN. The work involved C, Makefile, and system architecture skills, targeting improved security, reliability, and maintainability for firmware development in ARM TrustZone environments and complex build systems.
Overall Statistics
Feature vs Bugs
33%Features
Repository Contributions
4Total
Bugs
2
Commits
4
Features
1
Lines of code
63
Activity Months1
Your Network
679 peopleSame Organization
@arm.com538
Work History
January 2025
4 Commits • 1 Features
Jan 1, 2025January 2025 monthly summary — Trusted Firmware-A (zephyrproject-rtos/trusted-firmware-a): Focused on security hardening, build configurability, and deterministic SMMU behavior. Delivered three changes across the repository: (1) Flexible build configuration enabling RME and PIE with Pointer Authentication support, (2) Memory mapping alignment for ARM TF-A with RME using EL3_PAS in MAP_BL2_TOTAL, and (3) SMMU root port programming order enforcement to ensure CR0.GPCEN precedes ACCESSEN. These changes improve security posture, reliability, and maintainability, enabling customers to adopt modern protection features and reducing risk from misconfigurations. Tools/technologies involved include ARM TrustZone memory model, BRANCH_PROTECTION, Pointer Authentication, RME, SMMU configuration, memory mapping, and build-system improvements.
4 Commits • 1 Features
Jan 1, 2025January 2025 monthly summary — Trusted Firmware-A (zephyrproject-rtos/trusted-firmware-a): Focused on security hardening, build configurability, and deterministic SMMU behavior. Delivered three changes across the repository: (1) Flexible build configuration enabling RME and PIE with Pointer Authentication support, (2) Memory mapping alignment for ARM TF-A with RME using EL3_PAS in MAP_BL2_TOTAL, and (3) SMMU root port programming order enforcement to ensure CR0.GPCEN precedes ACCESSEN. These changes improve security posture, reliability, and maintainability, enabling customers to adopt modern protection features and reducing risk from misconfigurations. Tools/technologies involved include ARM TrustZone memory model, BRANCH_PROTECTION, Pointer Authentication, RME, SMMU configuration, memory mapping, and build-system improvements.
January 2025
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Quality Metrics
Correctness80.0%
Maintainability85.0%
Architecture80.0%
Performance60.0%
AI Usage20.0%
Skills & Technologies
Programming Languages
CMakefilerst
Technical Skills
ARM ArchitectureBuild System ConfigurationBuild SystemsDriver DevelopmentEmbedded SystemsEmbedded Systems DevelopmentFirmware DevelopmentMakefileSystem Architecture
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