For more information about buildroot, please consult the official buildroot documentation:

https://buildroot.org/downloads/manual/manual.html

For more information about metro project:

https://github.com/Chadys/metro_project

Below are step-by-step instructions for building an SD-card image containing metro project Raspberry Pi 3.

Download the buildroot long term support release:

wget https://buildroot.org/downloads/buildroot-2018.02.8.tar.gz
tar xvf buildroot-2018.02.8.tar.gz

git clone https://github.com/Rapiiidooo/buildroot-markerless-detector.git

cp -r buildroot-markerless-detector/board/ buildroot-markerless-detector/configs/ buildroot-markerless-detector/package/ buildroot-2018.02.8/

Use the defconfig metro_defconfig as a starting point for the configuration.

cd buildroot-2018.02.8
make metro_defconfig

Once the system is configured properly it is time to build.

To build an SD-card image, just run make:

make

or with the correct JLEVEL as your build machine:

BR2_JLEVEL=4 make

Buildroot will download and build all packages and create the SD-card image in one step.

The build will take some time (~40-60 minutes depending on the build machine).

The output will be available in output/images

Write the image to the SD-card with dd:

dd output/images/sdcard.img /dev/sdX

/dev/sdX should be replaced with the path to the SD-card device.