fork.conf
fork.conf is the profile configuration file. This file is mandatory and is sourced early by bsp.
BSP_GIT defines upstream source repo.
BSP_COMMIT or BSP_BRANCH or BSP_TAG defines the exact source code. The first defined option in the listed order will be used.
BSP_DEFCONFIG defines the defconfig used for building. Default to defconfig.
SUPPORTED_BOARDS defines the supported product list, which is a Bash array. bsp will use this list to create metapackages that reference the binary package. Suffixes are commonly used to denote kernel/firmware variants that also support the same board. However, the default package is the one that matches exactly to the product name.
You can read more about SUPPORTED_BOARDS in Build artifacts section.