Generate a descriptive error message in case cc26xxware/cc13xxware does not exist
CPU_ABS_PATH = arch/cpu/cc26xx-cc13xx
TI_XXWARE = $(CONTIKI_CPU)/$(TI_XXWARE_PATH)
+ifeq (,$(wildcard $(TI_XXWARE)))
+ $(warning $(TI_XXWARE) does not exist.)
+ $(warning Did you run 'git submodule update --init' ?)
+ $(error "")
+endif
+
### cc26xxware sources under driverlib will be added to the MODULES list
TI_XXWARE_SRC = $(CPU_ABS_PATH)/$(TI_XXWARE_PATH)/driverlib
