KHO_TEST_FDT
err = kho_add_subtree(KHO_TEST_FDT, folio_address(state->fdt));
err = kho_retrieve_subtree(KHO_TEST_FDT, &fdt_phys);
pr_warn("failed to retrieve %s FDT: %d\n", KHO_TEST_FDT, err);