https://github.com/mjkillough/ross

A simple OS for RaspberryPi
https://github.com/mjkillough/ross

Last synced: 2 days ago
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A simple OS for RaspberryPi

• Host: GitHub
• URL: https://github.com/mjkillough/ross
• Owner: mjkillough
• Created: 2014-05-26T21:10:11.000Z (over 10 years ago)
• Default Branch: master
• Last Pushed: 2016-06-19T20:37:12.000Z (over 8 years ago)
• Last Synced: 2023-03-22T19:50:59.672Z (over 1 year ago)
• Language: C
• Size: 28.3 KB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 4
• Metadata Files:
  • Readme: README.md

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README

        
# ross

A very simple OS for Raspberry Pi.

This README is quite bare. It exists so that I can remember how to set up a development environment.

# Dependencies

The scripts in this repository expect the following to be available on your PATH:

* mjkillough/qemu-rpi (QEMU fork with Raspberry Pi support)

* GCC ARM EABI toolchain

## Install qemu-rpi

To compile:

    $ brew install pkg-config glib automake libtool

    $ ./configure --target-list=arm-softmmu

    $ make

    $ make install

## Install embedded GCC ARM toolchain

Pre-compiled and source versions of this [are available](https://launchpad.net/gcc-arm-embedded/+download). Just download one and place it on your `PATH`.

# Develop / Run

To develop/run:

    $ make

    $ ./qemu.sh

To exit out of QEMU, hit: Ctrl + A, C, q, enter

## Debugging

To start QEMU with GDB stopped on the first instruction, pass `-s -S` to `./qemu.sh`.

To launch GDB, run `arm-none-eabi-gdb` from the root of the repo. (The repo contains a `.gdbinit` file, which sets up symbols and connects to a running QEMU session).

Useful tips:

* To enter the GDB curses UI, either press `C-x C-a` or pass `-tui`.

* When debugging ASM, `layout asm` and `stepi`/`si` are useful.