upstream-layers/openembedded-core/meta/conf/distro/include/init-manager-mdev-busybox.inc

# enable mdev/busybox for init
VIRTUAL-RUNTIME_dev_manager ??= "busybox-mdev"
VIRTUAL-RUNTIME_init_manager ??= "busybox"
VIRTUAL-RUNTIME_initscripts ??= "initscripts"
VIRTUAL-RUNTIME_login_manager ??= "busybox"