To get us to a successful package or image, BitBake performs some steps that we need to go through to get an understanding of the workflow. In certain cases, some of these steps can be avoided; but we are not discussing such cases, considering them as corner cases. For details on these, we should refer to the BitBake user manual.
When we invoke the BitBake command to build our image, the first thing it does is parse our base configuration metadata. This metadata, as we have already seen in the previous chapter, consists of build_bb/conf/bblayers.conf, multiple layer/conf/layer.conf, and poky/meta/conf/bitbake.conf. This data can be of the following types:
Configuration data
Class data
Recipes
Key variables BBFILES and BBPATH, which are constructed from the layer.conf file. Thus, the constructed BBPATH variable is used to locate configuration files under conf/ and class files under class/ directories. The BBFILES variable is used to find recipe files (.bb and...