flipperdevices/u-boot
Feb 2025 – Apr 2025
2 Months active
Languages Used
CDevice TreeKconfigDTS
Technical Skills
ARM ArchitectureBootloadersBuild SystemsClock ManagementConfiguration ManagementDevice Drivers
Alif Zakuan Yuslaimi
PROFILE
Alif Zakuan Yuslaimi
Worked on the flipperdevices/u-boot repository to enhance Agilex5 platform boot reliability and hardware initialization. Focused on low-level engineering, this developer improved boot paths, clock and PLL stability, and reset handling by refining device drivers, linker scripts, and memory coherency mechanisms. Leveraging C, Device Tree, and Kconfig, they enabled features such as I2C3 support, QSPI boot with UBI/UBIFS, and watchdog autostart, while also consolidating ARMv8 build consistency. Additionally, they addressed a power-on reset issue by configuring SDIO_SEL GPIO via device-tree GPIO hogging, ensuring deterministic IO levels and reducing boot-time variability across production hardware deployments.
Overall Statistics
Feature vs Bugs
80%Features
Repository Contributions
16Total
Bugs
1
Commits
16
Features
4
Lines of code
185
Activity Months2
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2681 peopleSame Organization
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Aparna PatraMember
Aashvij ShenaiMember
Alexander DahlMember
Work History
April 2025
1 Commits
Apr 1, 2025April 2025: Focused hardware bring-up and reliability improvements for flipperdevices/u-boot on the AgileX5 platform. Implemented a robust POR stabilization for the SDIO_SEL signal by configuring SDIO_SEL GPIO as an output low via device-tree GPIO hogging, ensuring a stable 0V reading after power-on reset. This change enhances boot determinism and reduces POR-related failures across production devices. Delivered through a targeted Device Tree/ARM DTS patch, aligning with ARM architecture practices and contributing to overall system reliability. Commit reference included for traceability.
1 Commits
Apr 1, 2025April 2025: Focused hardware bring-up and reliability improvements for flipperdevices/u-boot on the AgileX5 platform. Implemented a robust POR stabilization for the SDIO_SEL signal by configuring SDIO_SEL GPIO as an output low via device-tree GPIO hogging, ensuring a stable 0V reading after power-on reset. This change enhances boot determinism and reduces POR-related failures across production devices. Delivered through a targeted Device Tree/ARM DTS patch, aligning with ARM architecture practices and contributing to overall system reliability. Commit reference included for traceability.
April 2025
February 2025
15 Commits • 4 Features
Feb 1, 2025February 2025 — Improved Agilex5 boot and system management in flipperdevices/u-boot. Key outcomes: (1) Boot path and hardware init enhancements enabling I2C3, internal oscillator boot clock, QSPI boot with UBI/UBIFS, and watchdog autostart; (2) Clock and PLL stability improvements including asynchronous PLL mode and wait_for_bit_le32-based status handling; (3) Reset and power-management enhancements with PSCI reset driver, warm reset masking, and reduced GIC dependence; (4) Board environment and memory coherency enhancements exposing board_id, improving mailbox coherency with ATF, and streamlined SPL data handling and linker scripts; (5) CPU/ARMv8 build consistency via a common linker script and updated CPU info. Business value: faster, more reliable boot, safer reset/power transitions, and easier maintainability. Technologies demonstrated: ARM/SOCFPGA engineering, clock/PLL management, PSCI integration, memory coherency and ATF interfacing, SPL/build tooling and linker scripts.
February 2025
15 Commits • 4 Features
Feb 1, 2025February 2025 — Improved Agilex5 boot and system management in flipperdevices/u-boot. Key outcomes: (1) Boot path and hardware init enhancements enabling I2C3, internal oscillator boot clock, QSPI boot with UBI/UBIFS, and watchdog autostart; (2) Clock and PLL stability improvements including asynchronous PLL mode and wait_for_bit_le32-based status handling; (3) Reset and power-management enhancements with PSCI reset driver, warm reset masking, and reduced GIC dependence; (4) Board environment and memory coherency enhancements exposing board_id, improving mailbox coherency with ATF, and streamlined SPL data handling and linker scripts; (5) CPU/ARMv8 build consistency via a common linker script and updated CPU info. Business value: faster, more reliable boot, safer reset/power transitions, and easier maintainability. Technologies demonstrated: ARM/SOCFPGA engineering, clock/PLL management, PSCI integration, memory coherency and ATF interfacing, SPL/build tooling and linker scripts.
Activity
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Quality Metrics
Correctness91.2%
Maintainability90.0%
Architecture90.0%
Performance87.4%
AI Usage20.0%
Skills & Technologies
Programming Languages
CDTSDevice TreeKconfig
Technical Skills
ARM ArchitectureBootloadersBuild SystemsClock ManagementConfiguration ManagementDevice DriversDevice TreeDevice Tree ConfigurationDriver DevelopmentEmbedded SystemsFPGA ConfigurationKernel ConfigurationKernel DevelopmentLinker ScriptsLow-Level Programming
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