tianocore/edk2
Jan 2026 – Jan 2026
1 Month active
Languages Used
C
Technical Skills
embedded systemsfirmware developmentlow-level programming
Chao Liu
PROFILE
Chao Liu
Worked on stabilizing RISC-V boot paths in the tianocore/edk2 repository by addressing a critical DXE Phase TimeBase initialization issue. Implemented a constructor in UefiCpuPkg/BaseRiscV64CpuTimerLib using C to ensure mTimeBase was properly initialized during the DXE phase, calling GetPerformanceCounterProperties to prevent early runtime service crashes on platforms lacking fw_cfg support, such as QEMU rvsp-ref. This low-level firmware development improved boot reliability and runtime stability for RISC-V in virtualization scenarios. The work demonstrated expertise in embedded systems, UEFI DXE development, and debugging, and involved close collaboration with RISC-V platform engineers to resolve EDk2 issue #11747.
Overall Statistics
Feature vs Bugs
0%Features
Repository Contributions
1Total
Bugs
1
Commits
1
Features
0
Lines of code
114
Activity Months1
Your Network
232 peopleShared Repositories
232
Work History
January 2026
1 Commits
Jan 1, 2026Month: 2026-01. This month focused on stabilizing RISC-V boot paths in tianocore/edk2 by fixing a DXE Phase TimeBase initialization issue. Key feature/bug fix delivered: Added a constructor in UefiCpuPkg/BaseRiscV64CpuTimerLib to initialize mTimeBase during the DXE phase by calling GetPerformanceCounterProperties(NULL, NULL), ensuring mTimeBase is ready before virtual memory is enabled. This prevents crashes when Runtime Services call GetPerformanceCounterProperties() early, particularly on platforms without fw_cfg support (e.g., QEMU rvsp-ref). The change is associated with commit f2c63dca1bc5201903b75a8551afdf2c7ab2fc4d and addresses EDk2 issue #11747. Impact: Improves boot reliability and runtime stability for RISC-V in virtualization scenarios, reducing platform-specific crashes and enabling broader usage. Technologies/skills demonstrated: C, UEFI DXE development, RISC-V timing initialization, boot phase sequencing, debugging, code review, and collaboration with RISC-V platform engineers.
1 Commits
Jan 1, 2026Month: 2026-01. This month focused on stabilizing RISC-V boot paths in tianocore/edk2 by fixing a DXE Phase TimeBase initialization issue. Key feature/bug fix delivered: Added a constructor in UefiCpuPkg/BaseRiscV64CpuTimerLib to initialize mTimeBase during the DXE phase by calling GetPerformanceCounterProperties(NULL, NULL), ensuring mTimeBase is ready before virtual memory is enabled. This prevents crashes when Runtime Services call GetPerformanceCounterProperties() early, particularly on platforms without fw_cfg support (e.g., QEMU rvsp-ref). The change is associated with commit f2c63dca1bc5201903b75a8551afdf2c7ab2fc4d and addresses EDk2 issue #11747. Impact: Improves boot reliability and runtime stability for RISC-V in virtualization scenarios, reducing platform-specific crashes and enabling broader usage. Technologies/skills demonstrated: C, UEFI DXE development, RISC-V timing initialization, boot phase sequencing, debugging, code review, and collaboration with RISC-V platform engineers.
January 2026
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Quality Metrics
Correctness100.0%
Maintainability80.0%
Architecture100.0%
Performance80.0%
AI Usage20.0%
Skills & Technologies
Programming Languages
C
Technical Skills
embedded systemsfirmware developmentlow-level programming
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