define Build/sysupgrade-tar
sh $(TOPDIR)/scripts/sysupgrade-tar.sh \
--board $(if $(BOARD_NAME),$(BOARD_NAME),$(DEVICE_NAME)) \
- --kernel $(word 1,$^) \
- --rootfs $(word 2,$^) \
+ --kernel $(call param_get_default,kernel,$(1),$(word 1,$^)) \
+ --rootfs $(call param_get_default,rootfs,$(1),$(word 2,$^)) \
$@
endef