Raymond Mao | Technical research and notes on Embedded Systems, Trusted Firmware, Secure Boot, Measured Boot, OTA update, and Open Source collaboration.

Notes on Open Source Software, Embedded Firmware, Boot Architecture, Trusted Computing, and Firmware Security

Hi, I’m Raymond Mao.

This blog documents my research, investigations, lessons learned and hands-on experience in:

OSS (Open Source Software) contributions and ecosystem collaboration
Embedded Systems practices
Trusted Firmware stacks (TF-A / OP-TEE / U-Boot)
Measured Boot, TPM
Cryptography, Secure Boot
OTA update systems

Feel free to explore the posts below.

Posts

Nov 12, 2025
Enhancing U-Boot SMBIOS on Arm64: Full Support for System, Board, CPU, and Memory Tables
Nov 11, 2025
Enable CI on Firmware Handoff & Measured Boot
Sep 1, 2025
Run U-Boot CI Pipeline on Your Host
May 2, 2025
TPM 2.0 Event Log for U-Boot SPL on an ARMv8 Measured Boot Chain
Apr 4, 2025
Integrating MbedTLS LTS v3.6 into U-Boot for HTTPS Support
Feb 1, 2025
Solve the Measured Boot Pitfall: PCR Bank Misconfiguration in Run-time
Dec 10, 2024
Measured Boot and Event Log across TF-A / OP-TEE / U-Boot / Linux
Apr 29, 2024
Summary of Firmware Handoff Implementation across TF-A / OP-TEE / U-Boot
Feb 21, 2023
Research of OTA Solutions: RAUC, Mender and OSTree
Dec 20, 2022
How UEFI Secure Boot Works in U-Boot