overlay for linux kernel

toolchain/kernel-headers/Makefile

@@ -9,6 +9,10 @@ include ${ADK_TOPDIR}/mk/kernel-vars.mk
 include ${ADK_TOPDIR}/mk/buildhlp.mk
 
 $(TOOLCHAIN_BUILD_DIR)/w-$(PKG_NAME)-$(PKG_VERSION)-$(PKG_RELEASE)/linux-$(KERNEL_VERSION)/.patched:
+ifeq ($(ADK_LINUX_XTENSA),y)
+	tar xf $(TOPDIR)/target/xtensa/overlay/xtensa_dc232b.tar \
+		--strip-components=1 -C $(WRKSRC) linux
+endif
 ifneq ($(ADK_DISABLE_KERNEL_PATCHES),y)
 	$(TRACE) kernel-patch
 	$(PATCH) $(TOOLCHAIN_BUILD_DIR)/w-$(PKG_NAME)-$(PKG_VERSION)-$(PKG_RELEASE)/linux-$(KERNEL_VERSION) \