Let's dive into the basic concepts of layers:
A layer, in the technical sense of the term, has some properties. They are as follows:
.bbappendfiles should be joined. It means that if two layers include the same recipe (
.bb) file, the one with the higher priority is used.
For example, a layer with a priority value set to
6 has a higher chance of its recipe being used than one with a priority value set to
Furthermore, each layer is listed according to its functionality on this page: