config UT_OVERLAY bool "Enable Device Tree Overlays Unit Tests" depends on OF_LIBFDT_OVERLAY depends on UNIT_TEST help This enables the 'ut overlay' command which runs a series of unit tests on the fdt overlay code. If all is well then all tests pass although there will be a few messages printed along the way. Be warned that it requires an out-of-tree dtc compiler with patches to support the DT overlays, otherwise it will fail.