sypstraw/rpi4-osdev
Rpi4 Osdev
This project is a tutorial for developing a custom bare metal operating system specifically for the Raspberry Pi 4. It provides the guidance and resources necessary to write software that interacts directly with hardware without the use of a pre-existing kernel.
The project centers on an ARM64 cross-compilation toolchain and a build pipeline that transforms source code into raw binary images. It utilizes linker scripts to define physical memory addresses and section placements, ensuring the resulting binary loads at the correct hardware entry point.
The codebase covers direct hardware interfacing by writing to physical memory addresses and hardware registers. It also addresses embedded system booting through single-core boot sequencing and the management of processor states and memory stacks.
Features
- Tutorials - Offers a comprehensive tutorial on developing a custom bare metal operating system for the Raspberry Pi 4.
- Bare Metal Development - Provides a comprehensive tutorial and codebase for developing a custom bare-metal operating system from scratch.
- Embedded Hardware Cross-Compilation - Utilizes a cross-compilation toolchain configured specifically for ARM64 embedded hardware targets.
- Hardware Peripheral Control - Provides low-level control of system peripherals through direct physical memory address and register access.
- Bare-Metal Runtimes - Provides a bare-metal runtime environment that executes code directly on Raspberry Pi 4 hardware without an underlying operating system.
- Bare Metal Kernels - Provides a foundation for a custom kernel that interfaces directly with the Raspberry Pi 4 hardware.
- Linker Script Layouts - Uses linker scripts to define the physical memory placement of code and data sections for correct boot sequence execution.
- Linker Script Memory Layouts - Defines the mapping of object files to physical memory addresses using linker scripts.
- Raspberry Pi Systems Programming - Focuses specifically on low-level systems programming and hardware interfacing for the Raspberry Pi 4 architecture.
- Hardware Register Accessors - Enables direct interaction with hardware registers to control system peripherals and processor states.
- Register-Level Controllers - Provides register-level control for high-precision manipulation of hardware peripherals via memory-mapped addresses.
- Bootloader Binary Images - Implements a pipeline to transform compiled object files into raw binary images compatible with the Raspberry Pi 4 bootloader.
- Build Systems - Implements a build system to transform source code into raw binary images via linker scripts for target hardware.
- Embedded Boot Sequences - Defines memory addresses and linker scripts to ensure the Raspberry Pi 4 executes code correctly from the entry point.
- Boot Sequencing Control - Implements single-core boot sequencing to prevent race conditions during the initial hardware startup phase.
- Cross-Compilation Toolchains - Implements a build pipeline for generating binaries for target hardware from a different host system.
- System Boot Initializers - Includes routines to initialize the processor and prepare memory stacks to establish a known functional state.
- Cross Compilation Toolchains - Utilizes a set of host-based compilers and build tools specifically for targeting ARM64 processor architectures.
- Binary Cross-Compilation - Transforms low-level source code into executable binaries for a different target architecture using a cross-compiler.
