zephyrproject-rtos/trusted-firmware-m
Nov 2024 – Jun 2025
6 Months active
Languages Used
CCMakecmakerst
Technical Skills
Device DriversEmbedded SystemsRTOSSecurityDriver DevelopmentMemory Management
Hao Zhang
PROFILE
Hao Zhang
Over six months, contributed to the zephyrproject-rtos/trusted-firmware-m repository by developing and integrating low-level firmware features for embedded platforms. Delivered secure memory access, hardware-backed cryptography, and protected storage by implementing device drivers and updating build systems using C and CMake. Enhanced platform security through integration of the ADI hardware TRNG with the mbed TLS PSA crypto driver and enabled robust memory management with new controller drivers. Addressed system reliability by fixing boot-time register handling and improving build reproducibility. Expanded regression testing and documentation, ensuring stable deployments and alignment with evolving security requirements across RTOS and embedded system environments.
Overall Statistics
Feature vs Bugs
64%Features
Repository Contributions
13Total
Bugs
4
Commits
13
Features
7
Lines of code
2,378
Activity Months6
Your Network
272 peopleWork History
June 2025
2 Commits • 2 Features
Jun 1, 2025June 2025: Delivered two critical platform enhancements in trusted-firmware-m for the ADI variant: Protected Storage support with regression tests and updated configuration, and integration of ADI TRNG with the mbed TLS PSA crypto driver for hardware-backed RNG. No major defects recorded; regression coverage expanded to protect feature stability. Overall impact: stronger security, improved cryptographic performance, and faster ADI-based deployments. Technologies demonstrated: embedded C, platform extensions, TRNG integration, mbed TLS PSA crypto, regression testing, and build/configuration automation.
2 Commits • 2 Features
Jun 1, 2025June 2025: Delivered two critical platform enhancements in trusted-firmware-m for the ADI variant: Protected Storage support with regression tests and updated configuration, and integration of ADI TRNG with the mbed TLS PSA crypto driver for hardware-backed RNG. No major defects recorded; regression coverage expanded to protect feature stability. Overall impact: stronger security, improved cryptographic performance, and faster ADI-based deployments. Technologies demonstrated: embedded C, platform extensions, TRNG integration, mbed TLS PSA crypto, regression testing, and build/configuration automation.
June 2025
May 2025
6 Commits • 2 Features
May 1, 2025May 2025 monthly summary for zephyrproject-rtos/trusted-firmware-m: Delivered platform integration and build-system enhancements for ADI, enabled Protected Storage on MAX32657, updated BL2 build workflow for reproducibility, and hardened flash operations to protect data integrity. These contributions improved security, reliability, and cross-project consistency, enabling PS services on MAX32657 and more predictable builds across Zephyr and TF-M. Technologies demonstrated include CMake-based build customization, TF-M platform integration, and low-level flash programming considerations.
May 2025
6 Commits • 2 Features
May 1, 2025May 2025 monthly summary for zephyrproject-rtos/trusted-firmware-m: Delivered platform integration and build-system enhancements for ADI, enabled Protected Storage on MAX32657, updated BL2 build workflow for reproducibility, and hardened flash operations to protect data integrity. These contributions improved security, reliability, and cross-project consistency, enabling PS services on MAX32657 and more predictable builds across Zephyr and TF-M. Technologies demonstrated include CMake-based build customization, TF-M platform integration, and low-level flash programming considerations.
March 2025
2 Commits • 1 Features
Mar 1, 2025Month: 2025-03 — Concise monthly summary for zephyrproject-rtos/trusted-firmware-m focused on key platform updates for MAX32657 and TF-M alignment, with evidence of business value through stable builds and improved boot-time memory management.
2 Commits • 1 Features
Mar 1, 2025Month: 2025-03 — Concise monthly summary for zephyrproject-rtos/trusted-firmware-m focused on key platform updates for MAX32657 and TF-M alignment, with evidence of business value through stable builds and improved boot-time memory management.
March 2025
January 2025
1 Commits
Jan 1, 2025January 2025 (Month: 2025-01) — zephyrproject-rtos/trusted-firmware-m. Key deliverable this month was a targeted bug fix in the BootRom path to ensure robust secure/non-secure transitions after floating-point operations. Specifically, the FPCA bit in the control register was cleared via the ADI platform extension, preventing faults during BootRom initialization and improving system reliability. This change was implemented and committed under platform: ext: adi: clear FPCA bit of control register (085b652cf40edb1b2ea3cdf4e8e6f845075db931).
January 2025
1 Commits
Jan 1, 2025January 2025 (Month: 2025-01) — zephyrproject-rtos/trusted-firmware-m. Key deliverable this month was a targeted bug fix in the BootRom path to ensure robust secure/non-secure transitions after floating-point operations. Specifically, the FPCA bit in the control register was cleared via the ADI platform extension, preventing faults during BootRom initialization and improving system reliability. This change was implemented and committed under platform: ext: adi: clear FPCA bit of control register (085b652cf40edb1b2ea3cdf4e8e6f845075db931).
December 2024
1 Commits • 1 Features
Dec 1, 2024December 2024 monthly summary for zephyrproject-rtos/trusted-firmware-m highlighting key accomplishments, delivered features, impact, and demonstrated skills.
1 Commits • 1 Features
Dec 1, 2024December 2024 monthly summary for zephyrproject-rtos/trusted-firmware-m highlighting key accomplishments, delivered features, impact, and demonstrated skills.
December 2024
November 2024
1 Commits • 1 Features
Nov 1, 2024Month: 2024-11. Focused on trusted-firmware-m in the Zephyr project. Key feature delivered: OTP Memory Read Access for Non-Secure Zephyr apps. Updated build system and C code for secure read operations. This month emphasized enabling NS apps to access OTP data (USN, LDO trim values, DBB settings) via a new ioctl service, with a single committed change. Early results show improved hardware attestation readiness and streamlined configuration workflows.
November 2024
1 Commits • 1 Features
Nov 1, 2024Month: 2024-11. Focused on trusted-firmware-m in the Zephyr project. Key feature delivered: OTP Memory Read Access for Non-Secure Zephyr apps. Updated build system and C code for secure read operations. This month emphasized enabling NS apps to access OTP data (USN, LDO trim values, DBB settings) via a new ioctl service, with a single committed change. Early results show improved hardware attestation readiness and streamlined configuration workflows.
Activity
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Quality Metrics
Correctness94.6%
Maintainability93.8%
Architecture93.2%
Performance90.0%
AI Usage20.0%
Skills & Technologies
Programming Languages
CCMakecmakerst
Technical Skills
Build SystemBuild SystemsConfiguration ManagementCryptographyDevice DriversDocumentationDriver DevelopmentEmbedded SystemsFirmware DevelopmentHardware IntegrationLow-Level ProgrammingMemory ManagementPSA Crypto APIRTOSSecurity
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