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Bootloaders are critical foundation of Android boot process, responsible for everything from hardware initialization to kernel handoff. However, the current landscape is heavily fragmented, with each silicon vendor and OEM maintaining different bootloader implementations. This diversity leads to duplication of effort, slower security patching, and complex barriers to upgrading the Android boot framework across the ecosystem. To address these challenges, Google has introduced Generic BootLoader (GBL) - a unified, Rust-based bootloader developed within the Android Open Source Project (AOSP). Designed as a UEFI application, GBL standardizes the boot flow across x86, ARM64, and RISC-V architectures and can be deployed across various existing firmware stacks, including U-Boot, EDK2, and LittleKernel. This session provides a deep dive into GBL’s architecture. We will explore how GBL utilizes standard upstream UEFI protocols and how it interfaces to select appropriate Device Trees (DT), apply DT fixups, and prepare prepare kernel data (bootconfig/command-line). We will also examine GBL-specific protocols handling Android requirements like A/B slots, Verified Boot (AVB), and Fastboot.
