zephyrproject-rtos/trusted-firmware-m
Oct 2024 – Sep 2025
8 Months active
Languages Used
C++CMakeCcmakePython
Technical Skills
Build SystemsCompiler ToolchainsEmbedded SystemsC ProgrammingCMakeCode Refactoring
Dávid Házi
PROFILE
Dávid Házi
David Hazi contributed to the zephyrproject-rtos/trusted-firmware-m repository, focusing on embedded systems, build systems, and security engineering. Over eight months, he delivered features such as configurable NPU architecture selection, unified driver and MPU usage, and software-based DRBG for platforms lacking hardware RNG. David modernized CMake-based build automation, improved cross-toolchain compatibility, and enhanced cryptographic validation across boot stages. He addressed memory safety, reduced build noise, and enabled hardware-backed identity features, using C, Python, and CMake. His work demonstrated depth in low-level programming and firmware development, consistently improving reliability, maintainability, and security for cross-platform embedded deployments and provisioning workflows.
Overall Statistics
Feature vs Bugs
56%Features
Repository Contributions
18Total
Bugs
7
Commits
18
Features
9
Lines of code
2,757
Activity Months8
Your Network
539 people
Work History
September 2025
1 Commits
Sep 1, 2025September 2025 monthly summary for zephyrproject-rtos/trusted-firmware-m: Focused on cleaning up MPS4 build configuration to reduce misconfigurations and maintenance overhead. Key change: removed redundant Mbed TLS compile definitions from MPS4 common build config (targets bl1_1 and bl1_2).
1 Commits
Sep 1, 2025September 2025 monthly summary for zephyrproject-rtos/trusted-firmware-m: Focused on cleaning up MPS4 build configuration to reduce misconfigurations and maintenance overhead. Key change: removed redundant Mbed TLS compile definitions from MPS4 common build config (targets bl1_1 and bl1_2).
September 2025
April 2025
1 Commits
Apr 1, 2025April 2025 monthly summary for zephyrproject-rtos/trusted-firmware-m: Focused on aligning provisioning bundle build options for MPS4 with BL1 to improve cross-component compatibility and deployment robustness. Improvements reduce provisioning-time failures and simplify future maintenance across provisioning workflows.
April 2025
1 Commits
Apr 1, 2025April 2025 monthly summary for zephyrproject-rtos/trusted-firmware-m: Focused on aligning provisioning bundle build options for MPS4 with BL1 to improve cross-component compatibility and deployment robustness. Improvements reduce provisioning-time failures and simplify future maintenance across provisioning workflows.
March 2025
2 Commits • 1 Features
Mar 1, 2025Monthly summary for 2025-03: Implemented security-critical RNG and cross-platform build fixes in trusted-firmware-m. Delivered a software-based DRBG for MPS4 (mbedTLS HMAC_DRBG seeded from OTP) to provide deterministic randomness where TRNG is unavailable, and completed IAR compiler support and build compatibility improvements across platforms (optimization flags, pragmas include-order fixes, Corstone-3xx casts, and BL1_x HEAP/build flags). These changes enhance security, reliability, and cross-platform portability, enabling smoother deployment and CI, with measurable business value in secure boot and RNG reliability.
2 Commits • 1 Features
Mar 1, 2025Monthly summary for 2025-03: Implemented security-critical RNG and cross-platform build fixes in trusted-firmware-m. Delivered a software-based DRBG for MPS4 (mbedTLS HMAC_DRBG seeded from OTP) to provide deterministic randomness where TRNG is unavailable, and completed IAR compiler support and build compatibility improvements across platforms (optimization flags, pragmas include-order fixes, Corstone-3xx casts, and BL1_x HEAP/build flags). These changes enhance security, reliability, and cross-platform portability, enabling smoother deployment and CI, with measurable business value in secure boot and RNG reliability.
March 2025
February 2025
5 Commits • 3 Features
Feb 1, 2025February 2025 (2025-02) monthly summary for zephyrproject-rtos/trusted-firmware-m focusing on delivering compatibility, reliability, and security enhancements across the project. Highlights include a set of feature deliveries and targeted bug fixes, with measurable business value in cross-version tooling, memory safety, and hardware-backed security capabilities. Key features delivered: - Backward-compatible BL2 image tooling (commit ef8557b87163c35090c40cd3829026bd94cefa30): Update Python tooling to use dict.update() for compatibility with older Python versions, ensuring BL2 image creation and configuration tooling remains usable across environments. - Enable RSE ID feature in build (commit 857e1a4bdc6815301a5c4fad4fcd76c0c58ed2d5): Add a compile definition for RSE ID in CMake and enable the corresponding config option for the neoverse_rd target to activate hardware-based identifier support. - XIP encryption with measured boot support (commit 9a3caa701e564015038ac25af88b1feafcafc590): Enable secure/non-secure encryption for XIP=ON configurations, align boot measurement with the computed hash size, and update image signing scripts to incorporate BL1_2 hash and key-derivation labels during encryption. Major bugs fixed: - BL1/BL2 image copy size calculation fix (commit 894c379be4600ba00e664e360ad969e6a7fb4afd): Use the actual calculated BL2 code header size instead of a maximum header size when copying into the BL1 image to ensure correct memory allocation and prevent data corruption. - Measured boot: correct RSE hashing algorithm identifier (commit 0552be2965953e8434950abc9c8e8fa5bd25d0a1): Fix PSA_MEASUREMENT_HASH_ALG in the RSE common CMake to reference PSA_ALG_SHA_ and ensure the correct algorithm is identified for the measured boot provisioning process. Overall impact and accomplishments: - Strengthened cross-version tooling compatibility and reliability of BL2 image tooling. - Reduced risk of memory corruption during image assembly due to precise header size handling. - Improved measured boot integrity and hashing correctness, enhancing trust in the provisioning process. - Added hardware-based identity capability (RSE ID) for on-device identification on supported platforms. - Advanced security posture with XIP encryption aligned to measured boot, including updated signing and key-derivation labeling. Technologies/skills demonstrated: - Python tooling compatibility and modernization (dict.update() usage) across Python versions. - Build-system hardening via CMake compile definitions and config enablement for hardware features. - Security engineering: XIP encryption, measured boot alignment, and hash algorithm correctness. - Code quality and risk reduction through targeted bug fixes and precise memory management.
February 2025
5 Commits • 3 Features
Feb 1, 2025February 2025 (2025-02) monthly summary for zephyrproject-rtos/trusted-firmware-m focusing on delivering compatibility, reliability, and security enhancements across the project. Highlights include a set of feature deliveries and targeted bug fixes, with measurable business value in cross-version tooling, memory safety, and hardware-backed security capabilities. Key features delivered: - Backward-compatible BL2 image tooling (commit ef8557b87163c35090c40cd3829026bd94cefa30): Update Python tooling to use dict.update() for compatibility with older Python versions, ensuring BL2 image creation and configuration tooling remains usable across environments. - Enable RSE ID feature in build (commit 857e1a4bdc6815301a5c4fad4fcd76c0c58ed2d5): Add a compile definition for RSE ID in CMake and enable the corresponding config option for the neoverse_rd target to activate hardware-based identifier support. - XIP encryption with measured boot support (commit 9a3caa701e564015038ac25af88b1feafcafc590): Enable secure/non-secure encryption for XIP=ON configurations, align boot measurement with the computed hash size, and update image signing scripts to incorporate BL1_2 hash and key-derivation labels during encryption. Major bugs fixed: - BL1/BL2 image copy size calculation fix (commit 894c379be4600ba00e664e360ad969e6a7fb4afd): Use the actual calculated BL2 code header size instead of a maximum header size when copying into the BL1 image to ensure correct memory allocation and prevent data corruption. - Measured boot: correct RSE hashing algorithm identifier (commit 0552be2965953e8434950abc9c8e8fa5bd25d0a1): Fix PSA_MEASUREMENT_HASH_ALG in the RSE common CMake to reference PSA_ALG_SHA_ and ensure the correct algorithm is identified for the measured boot provisioning process. Overall impact and accomplishments: - Strengthened cross-version tooling compatibility and reliability of BL2 image tooling. - Reduced risk of memory corruption during image assembly due to precise header size handling. - Improved measured boot integrity and hashing correctness, enhancing trust in the provisioning process. - Added hardware-based identity capability (RSE ID) for on-device identification on supported platforms. - Advanced security posture with XIP encryption aligned to measured boot, including updated signing and key-derivation labeling. Technologies/skills demonstrated: - Python tooling compatibility and modernization (dict.update() usage) across Python versions. - Build-system hardening via CMake compile definitions and config enablement for hardware features. - Security engineering: XIP encryption, measured boot alignment, and hash algorithm correctness. - Code quality and risk reduction through targeted bug fixes and precise memory management.
January 2025
3 Commits • 1 Features
Jan 1, 2025January 2025 focused on unifying MPU driver usage across AN521 and hardening cryptographic paths for the MPS4 platform. Key outcomes include adopting and stabilizing the Common v8m MPU driver, refactoring AN521 to consume the shared driver via build system changes, and removing the legacy AN521 MPU driver files. Additionally, targeted fixes to BL2 encryption and hash validation on MPS4 corrected a SHA-256 calculation error, addressed an uninitialized BL1 decryption variable, enforced OTP read size constraints, and improved HKDF key derivation for BL2. These changes enhance security, stability, and maintainability, reduce duplication, and accelerate future platform work. Technologies demonstrated include CMake-based build modernization, driver abstraction and reuse, and cryptographic validation across boot stages.
3 Commits • 1 Features
Jan 1, 2025January 2025 focused on unifying MPU driver usage across AN521 and hardening cryptographic paths for the MPS4 platform. Key outcomes include adopting and stabilizing the Common v8m MPU driver, refactoring AN521 to consume the shared driver via build system changes, and removing the legacy AN521 MPU driver files. Additionally, targeted fixes to BL2 encryption and hash validation on MPS4 corrected a SHA-256 calculation error, addressed an uninitialized BL1 decryption variable, enforced OTP read size constraints, and improved HKDF key derivation for BL2. These changes enhance security, stability, and maintainability, reduce duplication, and accelerate future platform work. Technologies demonstrated include CMake-based build modernization, driver abstraction and reuse, and cryptographic validation across boot stages.
January 2025
December 2024
1 Commits • 1 Features
Dec 1, 2024December 2024 monthly summary focused on Trusted Firmware M contributions for the Zephyr project. Key work centered on enabling configurable NPU architecture selection for Corstone platforms, with targeted build system improvements and validation to support flexible deployment and quicker adaptation to new Corstone variants.
December 2024
1 Commits • 1 Features
Dec 1, 2024December 2024 monthly summary focused on Trusted Firmware M contributions for the Zephyr project. Key work centered on enabling configurable NPU architecture selection for Corstone platforms, with targeted build system improvements and validation to support flexible deployment and quicker adaptation to new Corstone variants.
November 2024
3 Commits • 2 Features
Nov 1, 2024November 2024 monthly summary for zephyrproject-rtos/trusted-firmware-m focusing on reliability improvements, driver unification, and stack upgrades. Deliverables centered on stable UART transmission, cross-variant driver maintainability, and updated NPU driver integration.
3 Commits • 2 Features
Nov 1, 2024November 2024 monthly summary for zephyrproject-rtos/trusted-firmware-m focusing on reliability improvements, driver unification, and stack upgrades. Deliverables centered on stable UART transmission, cross-variant driver maintainability, and updated NPU driver integration.
November 2024
October 2024
2 Commits • 1 Features
Oct 1, 2024October 2024 monthly summary for zephyrproject-rtos/trusted-firmware-m: Implemented conditional suppression of RWX segment warnings for GNU Arm compiler 11.3.1+ on rp2350. Added conditional linker flag in rp2350 CMakeLists.txt to suppress read-execute-write warnings, aligning with Raspberry Pi SDK practices and reducing noisy builds. Delivered via two commits, ensuring compatibility with newer toolchains while preserving existing behavior for other toolchains. The change improves developer productivity and CI stability by delivering cleaner build output.
October 2024
2 Commits • 1 Features
Oct 1, 2024October 2024 monthly summary for zephyrproject-rtos/trusted-firmware-m: Implemented conditional suppression of RWX segment warnings for GNU Arm compiler 11.3.1+ on rp2350. Added conditional linker flag in rp2350 CMakeLists.txt to suppress read-execute-write warnings, aligning with Raspberry Pi SDK practices and reducing noisy builds. Delivered via two commits, ensuring compatibility with newer toolchains while preserving existing behavior for other toolchains. The change improves developer productivity and CI stability by delivering cleaner build output.
Activity
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Quality Metrics
Correctness88.4%
Maintainability87.8%
Architecture87.8%
Performance78.8%
AI Usage20.0%
Skills & Technologies
Programming Languages
CC++CMakePythoncmake
Technical Skills
Build SystemsBuild systemsC ProgrammingCMakeCode RefactoringCompiler ToolchainsCryptographyDriver DevelopmentEmbedded SystemsFirmware DevelopmentFirmware developmentLow-Level ProgrammingMemory Protection Unit (MPU)Platform ConfigurationPlatform Integration
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