Qt Onboard is designed for versatile customization possibilities:

You can use the Yocto tools to build custom Qt Onboard images for a target device that is already supported by Qt Onboard. By building a custom image, you can have control over which packages are included in the build and how the software stack is configured. For more information, see How to create a Qt Onboard image and topics under How to customize a Qt Onboard image.

Qt Board Support Package (QBSP) provides needed components for using Qt on an embedded device. QBSPs are installed using Qt Online Installer, either from online content or from a separately downloaded .qbsp file. The .qbsp files provides a way to deliver and install additional content that are not part of the official releases.