Bootloaders

U-Boot is an embedded bootloader that initializes hardware components and loads operating system kernels into memory. It functions as a hardware abstraction layer providing standardized access to networking, storage, and peripheral buses, while also serving as a secure boot loader and a firmware update interface. The project distinguishes itself through the implementation of secure boot sequences that verify cryptographic signatures and interface with TPM modules to establish hardware-rooted trust. It further provides specialized capabilities for updating device firmware via standardized prot

netboot.xyz is a network-based system management platform that enables automated operating system deployment and remote system maintenance. By leveraging iPXE and standard network protocols like DHCP and TFTP, it provides a centralized infrastructure for booting installers and utility tools directly over a local network. The system is designed to facilitate unattended installations and live environment execution, allowing users to manage hardware without the need for physical installation media. The project distinguishes itself through a highly flexible, template-driven approach to boot menu

edk2 is a development project for creating system firmware that complies with the UEFI specification. It provides the necessary infrastructure to initialize hardware platforms and boot operating systems across multiple CPU architectures. The project utilizes a modular firmware architecture that decouples high-level management protocols from physical transport layers. It implements critical security features, including a measured boot chain, cryptographic primitives for image authentication, and support for Trusted Platform Module hardware and software implementations. Its capability surface

m1n1 is a low-level bootloader for ARM64-based Apple Silicon hardware. It serves as a firmware tool and experimentation environment for loading external kernels and non-native operating systems. The project enables the execution of concatenated binary payloads containing kernels, device trees, and ramdisks. It provides a platform for firmware experimentation and the deployment of custom kernels on Apple Silicon chips. The system covers low-level hardware abstraction, including memory-mapped register access, device tree transmission, and stage-based bootloading. It also includes UART-based se

OpenCorePkg is a modular UEFI bootloader designed to initialize hardware and facilitate the loading of modern operating systems on non-standard or unsupported hardware. It functions as a comprehensive firmware emulation environment, providing the necessary runtime services and memory management to bridge the gap between diverse hardware configurations and operating system requirements. The project distinguishes itself through its ability to perform runtime kernel patching and system firmware modification, allowing for the injection of drivers and the manipulation of hardware tables during the

CloverBootloader is a UEFI-compliant boot loader designed to initialize hardware and launch multiple operating systems across various platforms. Its primary purpose is to enable the booting of operating systems on unsupported hardware through system identity spoofing and hardware emulation. The project specializes in hardware compatibility patching by modifying ACPI tables, faking hardware IDs, and patching binary kernels or extensions in memory during the boot process. It provides capabilities to inject kernel extensions and spoof system parameters, such as product names and serial numbers,

30dayMakeOS is an educational hobby operating system project designed for the x86 architecture. It implements a monolithic kernel and a custom bootloader that transitions the CPU from real mode to 32-bit protected mode to enable flat memory addressing. The project focuses on low-level system development, featuring a custom graphics driver for direct pixel-buffer rendering and window management without an existing operating system. It includes an x86 bootloader that loads the kernel from disk into memory. The system covers core kernel capabilities including round-robin task scheduling for pro

Limine is a multiprotocol operating system bootloader that bridges low-level hardware initialization and system software across legacy BIOS and modern UEFI firmware environments. It executes directly on bare-metal hardware without an underlying operating system kernel or standard C library, parsing storage media and filesystems during the early boot sequence before OS drivers load. The software targets diverse processor architectures including x86, ARM, RISC-V, and LoongArch through discrete target binaries built from shared source code. It reads files directly from FAT and ISO9660 storage f

This project is a bare-metal operating system developed for ARM64 architecture. It serves as a low-level implementation of kernel engineering, focusing on the fundamental construction of an OS from the hardware level up. The system is distinguished by its comprehensive approach to ARM64 processor control, featuring a red-black tree task scheduler and a hierarchical page table system for virtual memory management. It implements a sophisticated privilege model that handles transitions between kernel and user modes, ensuring process isolation through address space splitting and exception level m

This project is a pure-Rust bootloader and firmware loader designed for x86 operating system development. It initializes bare-metal hardware and loads compiled operating system kernels from both legacy BIOS and modern UEFI firmware environments into a running state. The software utilizes a dual-firmware boot architecture and a pure-rust low-level runtime to handle hardware initialization and memory management without relying on standard library runtimes. It provides automated disk image packaging to combine compiled kernels and bootloader binaries into ready-to-boot FAT-formatted disk images

STM32duino-bootloader is a firmware bootloader and microcontroller firmware flasher designed for STM32 microcontrollers. Operating as a low-level startup routine, it initializes microcontroller peripherals, handles USB communication routines, and launches user applications upon system reset. This enables direct USB programming and application execution on the hardware without requiring external hardware programmers. The bootloader supports firmware updates by presenting the microcontroller as a USB storage device that accepts binary drag-and-drop file transfers. It writes incoming firmware by

U-boot_mod is an enhanced system bootstrap program and customizable embedded device bootloader stored in non-volatile flash memory to initialize hardware, load firmware images, and serve as a network router recovery tool. It provides a browser-based rescue interface and web-based firmware recovery capabilities to repair corrupted device software and flash updates directly through a web browser without requiring a physical serial cable. The project incorporates dynamic flash chip probing and automatic storage detection to identify connected hardware registers at startup using standard paramete

Bootloader for ARM Cortex-M MCUs

wolfSSL Secure Bootloader (Home page, Manual, wolfBoot-examples)