apache/nuttx
Oct 2024 – Jan 2026
9 Months active
Languages Used
AssemblyCKconfigMakefileRST
Technical Skills
ARM ArchitectureARM64 ArchitectureEmbedded SystemsLow-Level ProgrammingARM64 architectureDebugging
lipengfei28
PROFILE
Lipengfei28
Worked on the apache/nuttx repository, delivering features and fixes across ARM64, RISC-V, and x86_64 architectures with a focus on embedded systems and kernel development. Built and enhanced PCI device management, memory barrier standardization, and platform support for i.MX95, using C and Assembly to implement low-level drivers, memory management routines, and board support packages. Addressed hardware abstraction and system integration challenges by refining DMA handling, context switching, and resource sizing in device drivers. Prioritized maintainability and cross-platform consistency, contributing robust code refactoring and documentation. Demonstrated expertise in ARM architecture, RTOS development, and debugging, ensuring reliable deployment and hardware compatibility.
Overall Statistics
Feature vs Bugs
65%Features
Repository Contributions
32Total
Bugs
6
Commits
32
Features
11
Lines of code
9,736
Activity Months9
Your Network
424 peopleSame Organization
@xiaomi.com182
anjiahaoMember
anpeiyunMember
buxiasenMember
caifan3Member
caofuqi1Member
cenzhanquan1Member
bingchen-miMember
Kai ChengMember
chenrun1Member
Work History
January 2026
1 Commits
Jan 1, 2026January 2026 monthly summary for apache/nuttx. Focused on correcting PCI BAR size probing to ensure accurate resource size calculations and stable device initialization in the PCI driver. The primary delivery was a fix to compute the BAR mask correctly by writing 0xffffffff during probing, improving resource sizing reliability across PCI devices.
1 Commits
Jan 1, 2026January 2026 monthly summary for apache/nuttx. Focused on correcting PCI BAR size probing to ensure accurate resource size calculations and stable device initialization in the PCI driver. The primary delivery was a fix to compute the BAR mask correctly by writing 0xffffffff during probing, improving resource sizing reliability across PCI devices.
January 2026
August 2025
4 Commits • 2 Features
Aug 1, 2025August 2025: Delivered two major capabilities for the Nuttx repository on the i.MX95 platform, focusing on hardware abstraction, configurability, and validation. The work enhances system-level control, PCI readiness, and end-to-end testing, strengthening reliability and future scalability for ARM64/IMX-based targets.
August 2025
4 Commits • 2 Features
Aug 1, 2025August 2025: Delivered two major capabilities for the Nuttx repository on the i.MX95 platform, focusing on hardware abstraction, configurability, and validation. The work enhances system-level control, PCI readiness, and end-to-end testing, strengthening reliability and future scalability for ARM64/IMX-based targets.
July 2025
5 Commits • 3 Features
Jul 1, 2025July 2025 monthly summary for apache/nuttx: Delivered cross-architecture platform and peripheral support with a focus on ARM64 and i.MX95, enhanced PCIe endpoint memory management, and documented the changes. Key achievements include i.MX95 platform support across arch/arm64, boards, and docs; MU and SCMI port to arm64; and PCIe DMA heap initialization for EPCs to improve cache coherence and memory handling. No major bugs reported this period. The work strengthens production readiness, accelerates multi-ISA deployments, and positions Nuttx for upcoming SBC/SOC adoptions. Technologies demonstrated include ARM64 driver porting, PCIe DMA memory management, Kconfig and board bring-up, and comprehensive documentation.
5 Commits • 3 Features
Jul 1, 2025July 2025 monthly summary for apache/nuttx: Delivered cross-architecture platform and peripheral support with a focus on ARM64 and i.MX95, enhanced PCIe endpoint memory management, and documented the changes. Key achievements include i.MX95 platform support across arch/arm64, boards, and docs; MU and SCMI port to arm64; and PCIe DMA heap initialization for EPCs to improve cache coherence and memory handling. No major bugs reported this period. The work strengthens production readiness, accelerates multi-ISA deployments, and positions Nuttx for upcoming SBC/SOC adoptions. Technologies demonstrated include ARM64 driver porting, PCIe DMA memory management, Kconfig and board bring-up, and comprehensive documentation.
July 2025
June 2025
1 Commits
Jun 1, 2025June 2025 monthly summary focusing on key accomplishments and business impact. The primary deliverable was a critical ARM64 memory management fix in the Nuttx repository (apache/nuttx).
June 2025
1 Commits
Jun 1, 2025June 2025 monthly summary focusing on key accomplishments and business impact. The primary deliverable was a critical ARM64 memory management fix in the Nuttx repository (apache/nuttx).
March 2025
1 Commits
Mar 1, 2025March 2025: Delivered a targeted PCI IRQ parameter handling fix in the Nuttx kernel (apache/nuttx). This work ensures correct parameter usage in pci_disable_irq and pci_enable_irq, stabilizing IRQ handling in PCI device tests. Associated commit edd86a5b59400778252bed2adc6f5b9636abe060, signed-off by lipengfei28, demonstrates adherence to contribution standards and code quality.
1 Commits
Mar 1, 2025March 2025: Delivered a targeted PCI IRQ parameter handling fix in the Nuttx kernel (apache/nuttx). This work ensures correct parameter usage in pci_disable_irq and pci_enable_irq, stabilizing IRQ handling in PCI device tests. Associated commit edd86a5b59400778252bed2adc6f5b9636abe060, signed-off by lipengfei28, demonstrates adherence to contribution standards and code quality.
March 2025
January 2025
3 Commits • 1 Features
Jan 1, 2025January 2025 monthly summary for apache/nuttx focusing on virtualization-ready PCI pathways and cross-architecture build stability. Delivered PCI device handling enhancements for x86_64 with virtualization and added PCI legacy IRQ enable/disable functionality, alongside fixes that improve virtualization fidelity and PCI configuration correctness. Fixed a DMA pointer casting build warning on ARM32 to enhance build stability and maintainability.
January 2025
3 Commits • 1 Features
Jan 1, 2025January 2025 monthly summary for apache/nuttx focusing on virtualization-ready PCI pathways and cross-architecture build stability. Delivered PCI device handling enhancements for x86_64 with virtualization and added PCI legacy IRQ enable/disable functionality, alongside fixes that improve virtualization fidelity and PCI configuration correctness. Fixed a DMA pointer casting build warning on ARM32 to enhance build stability and maintainability.
December 2024
8 Commits • 2 Features
Dec 1, 2024Month: 2024-12. Focused on delivering cross-architecture memory barrier standardization and MPU initialization consolidation in the NuttX project. Emphasized maintainability, correctness, and cross-platform consistency to enable safer code and easier onboarding across architectures.
8 Commits • 2 Features
Dec 1, 2024Month: 2024-12. Focused on delivering cross-architecture memory barrier standardization and MPU initialization consolidation in the NuttX project. Emphasized maintainability, correctness, and cross-platform consistency to enable safer code and easier onboarding across architectures.
December 2024
November 2024
7 Commits • 3 Features
Nov 1, 2024November 2024 Nuttx monthly summary: Delivered significant improvements in PCI device management on apache/nuttx and strengthened ARM64 kernel interfaces. Key outcomes include robust PCI device registration and address translation, stable BAR handling across devices, and enhanced ARM64 context switching and fatal error handling. Also added an ARM64 non-kernel BUILD capability (ARCH_HAVE_FORK), broadening deployment options. These changes improve hardware compatibility, reliability, and build flexibility, enabling easier integration of PCI-based systems and ARM64 deployments in production.
November 2024
7 Commits • 3 Features
Nov 1, 2024November 2024 Nuttx monthly summary: Delivered significant improvements in PCI device management on apache/nuttx and strengthened ARM64 kernel interfaces. Key outcomes include robust PCI device registration and address translation, stable BAR handling across devices, and enhanced ARM64 context switching and fatal error handling. Also added an ARM64 non-kernel BUILD capability (ARCH_HAVE_FORK), broadening deployment options. These changes improve hardware compatibility, reliability, and build flexibility, enabling easier integration of PCI-based systems and ARM64 deployments in production.
October 2024
2 Commits
Oct 1, 2024Monthly summary for 2024-10 (apache/nuttx): Delivered a hardware-low-level robustness fix for ARM64 vector table. Implemented PC-relative addressing to reliably load the arm64_fatal_handle and aligned the vector table to a 2K boundary, addressing a bug where the vector table could be located far from the handle and causing unstable interrupts. Associated commits ensure traceability and reproducibility.
2 Commits
Oct 1, 2024Monthly summary for 2024-10 (apache/nuttx): Delivered a hardware-low-level robustness fix for ARM64 vector table. Implemented PC-relative addressing to reliably load the arm64_fatal_handle and aligned the vector table to a 2K boundary, addressing a bug where the vector table could be located far from the handle and causing unstable interrupts. Associated commits ensure traceability and reproducibility.
October 2024
Activity
Loading activity data...
Quality Metrics
Correctness93.2%
Maintainability91.0%
Architecture91.6%
Performance90.4%
AI Usage20.0%
Skills & Technologies
Programming Languages
AssemblyCKconfigMakefileRST
Technical Skills
ARM ArchitectureARM architectureARM64 ArchitectureARM64 architectureAssemblyAssembly LanguageBoard Support Package (BSP) DevelopmentC programmingCode RefactoringDebuggingDevice Driver IntegrationDevice DriversDocumentationDriver DevelopmentEmbedded Systems
Repositories Contributed To
Overview of all repositories you've contributed to across your timeline