+ifneq ($(CONFIG_DM),y)
+ @echo >&2 "===================== WARNING ======================"
+ @echo >&2 "This board does not use CONFIG_DM. CONFIG_DM will be"
+ @echo >&2 "compulsory starting with the v2020.01 release."
+ @echo >&2 "Failure to update may result in board removal."
+ @echo >&2 "See doc/driver-model/migration.rst for more info."
+ @echo >&2 "===================================================="
+endif