An out of the box Raspberry Pi Raspbian distro with a realtime kernel. The kernel is a RaspberryPi kernel patched with the Preempt RT patch. Kernel patches are taken from here.

RealtimePi uses CustomPiOS, and you can use RealtimePi as a base image for CustomPiOS to make your own realtime kernel-based disros.

Official mirror is here

Nightly builds are available here (currently built on demand)

1. Unzip the image and install it to an SD card like any other Raspberry Pi image
2. Configure your WiFi by editing alarmpi-wpa-supplicant.txt or realtimepi-network.txt on the root of the flashed card when using it like a flash drive
3. Boot the Pi from the SD card

• Raspberrypi, any.
• 2A power supply

• Realtime kernel out of the box for both armv6 and armv7. All Pies that Raspbian supports are supported.
• Tools to configure the network via text files /boot

1. qemu-arm-static
2. CustomPiOS
3. Downloaded Raspbian image.
4. root privileges for chroot
5. Bash
6. realpath
7. sudo (the script itself calls it, running as root without sudo won't work)

RealtimePi can be built from Debian, Ubuntu, Raspbian. Build requires about 3.5 GB of free space available. Note it takes about 6 hours to builds the kernel, and 12 for both kernels! You can build it by issuing the following commands:

sudo apt-get install realpath p7zip-full qemu-user-static

git clone https://github.com/guysoft/CustomPiOS.git
git clone https://github.com/guysoft/RealtimePi.git
cd RealtimePi/src/image
wget -c --trust-server-names 'https://downloads.raspberrypi.org/raspbian_lite_latest'
cd ..
../../CustomPiOS/src/update-custompios-paths
sudo modprobe loop
sudo bash -x ./build_dist

RealtimePi supports building variants, which are builds with changes from the main release build. An example and other variants are available in the folder src/variants/example.

To build a variant use:

sudo bash -x ./build_dist [Variant]

There is a vagrant machine configuration to let build RealtimePi in case your build environment behaves differently. Unless you do extra configuration, vagrant must run as root to have nfs folder sync working.

To use it:

sudo apt-get install vagrant nfs-kernel-server
sudo vagrant plugin install vagrant-nfs_guest
sudo modprobe nfs
cd RealtimePi/src/vagrant
sudo vagrant up

After provisioning the machine, its also possible to run a nightly build which updates from devel using:

cd RealtimePi/src/vagrant
run_vagrant_build.sh

To build a variant on the machine simply run:

cd RealtimePi/src/vagrant
run_vagrant_build.sh [Variant]

1. If needed, override existing config settings by creating a new file src/config.local. You can override all settings found in src/config. If you need to override the path to the Raspbian image to use for building RealtimePi, override the path to be used in ZIP_IMG. By default, the most recent file matching *-raspbian.zip found in src/image will be used.
2. Run src/build_dist as root.
3. The final image will be created in src/workspace

Code contribution would be appreciated!