DietPi is a highly optimised & minimal Debian-based Linux distribution. DietPi is extremely lightweight at its core, and also extremely easy to install and use.
Setting up a single board computer (SBC) or even a computer, for both regular or server use, takes time and skill. DietPi provides an easy way to install and run favourite software you choose. For more information, please refre to https://dietpi.com/docs/.
DietPi supports many of the NanoPi board series, you may download the image file from here: