sunkit02/pios

Simple Operating System for the Raspbery Pi 1B

PiOS

Getting Started

Ensure that you are using a Linux system (Native or WSL should both work) with all the specified dev dependencies installed. A setup script is coming in the future for Ubuntu and Arch.

After setting up the environment, create a directory build then run make should compile a new PiOS kernel image. Running make run should spin up a Raspberry Pi 1A+ emulator in QEMU and load the PiOS kernel.

To run the PiOS image on hardware, replace the kernel.img in the boot sector of a copy of Rasbian with the kernel.img in the build directory (Not working at the moment).

Dev Dependencies

• make (build automation)
• arm-none-eabi-gcc (compilation)
• qemu-system-arm (emulation)
• screen (serial port communication with hardware)

Note:

Do not run replace_img.sh and restore_img.sh if you don't know what exactly the scripts do!

Credits

Code used for booting (boot/boot.s) and uart serial communication (drivers/bcm2835-uart.c), and linking (linker.ld) are accredited to wiki.osdev.org.

Link to article: Raspberry Pi Bare Bones