--- zzzz-none-000/linux-4.9.218/arch/xtensa/boot/dts/Makefile	2020-04-02 15:20:41.000000000 +0000
+++ seale-7590ax-750/linux-4.9.218/arch/xtensa/boot/dts/Makefile	2023-03-29 10:59:06.000000000 +0000
@@ -12,9 +12,6 @@
 obj-$(CONFIG_OF) += $(BUILTIN_DTB)
 endif
 
-dtstree := $(srctree)/$(src)
-dtb-$(CONFIG_OF_ALL_DTBS) := $(patsubst $(dtstree)/%.dts,%.dtb, $(wildcard $(dtstree)/*.dts))
-
-always += $(dtb-y)
-clean-files += *.dtb *.dtb.S
-
+# for CONFIG_OF_ALL_DTBS test
+dtstree	:= $(srctree)/$(src)
+dtb-	:= $(patsubst $(dtstree)/%.dts,%.dtb, $(wildcard $(dtstree)/*.dts))