https://github.com/strawberryhacker/operating-system-cortex-a5

Operating system
https://github.com/strawberryhacker/operating-system-cortex-a5

Last synced: 23 days ago
JSON representation

Operating system

• Host: GitHub
• URL: https://github.com/strawberryhacker/operating-system-cortex-a5
• Owner: strawberryhacker
• License: mit
• Created: 2020-09-05T22:04:03.000Z (over 4 years ago)
• Default Branch: master
• Last Pushed: 2021-01-20T05:46:29.000Z (almost 4 years ago)
• Last Synced: 2024-09-25T11:04:19.240Z (3 months ago)
• Language: C
• Homepage:
• Size: 12.5 MB
• Stars: 32
• Watchers: 4
• Forks: 2
• Open Issues: 22
• Metadata Files:
  • Readme: README.md
  • License: LICENSE.md

Awesome Lists containing this project

• awesome-embedded-software - citrus - Bare metal ARM® Cortex®-A5 operating system. (OS / Random Number Generation)

README

        
## Summary

Citrus is a bare metal lightweight operation system designed for the Cortex®-A series. Every thing will be completely bare metal - no libraries - literally.

## Making an application

Coming soon

## Install

Download and burn the disk image file and insert into the board. This will load the bootloader which will load the kernel. To enter debug mode, connect a jumper to PC20 and make the kernel using make install. 

## Building

Some packages is required in order to build the operating system. I recomend using Ubuntu, either native or in WSL. The build-essentials package is used for running make, and the gcc-arm-none-eabi is the compiler toolchain used for building and debugging the operating system.

```

> sudo apt update

> sudo apt install build-essential

> sudo apt install gcc-arm-none-eabi

```

Then you must install the second stage bootloader; c-boot, which will load the operating system into main memory.

```

> git clone https://github.com/strawberryhacker/c-boot

> cd c-boot

> make

```

This will generate a binary called **boot.bin** in the build/ folder. Place this file in the **root** directory of a FAT formatted SD card and plug it into the board. The next step is to download and build the kernel. 

```

> git clone https://github.com/strawberryhacker/citrus

> cd citrus

> make install

```

This will load the kernel image to main memory over serial and start it. Support for loading the kernel from an SD card will be added to c-boot later.