Fix

release/src-rt-5.04axhnd.675x/bootloaders/u-boot-2019.07/drivers/net/bcmbca/rtk/Makefile

@@ -1,8 +1,14 @@
 obj-y += RTK_OBJS.o
 
-# MODEL_B = $(subst -,,$(BUILD_NAME))
-# MODEL_LC = $(shell echo $(MODEL_B) | tr '[:upper:]' '[:lower:]')
-MODEL_E = $(subst -,,$(MODEL))
+# HACK: BUILD_NAME and MODEL are lacks of '-'. 
+# Check if BUILD_NAME contains RTAX58U_V2
+ifeq ($(findstring RTAX58U_V2,$(BUILD_NAME)),RTAX58U_V2)
+    MODEL = rt-ax58u_v2
+else
+    # Otherwise, exit with an error message
+    $(error Build name not defined)
+endif
+
 RTK_OBJS-objs += RTK_OBJS_preb.o
 $(obj)/RTK_OBJS_preb.o:
-	cp $(srctree)/../obj.$(MODEL_E)/uboot/drivers/net/bcmbca/rtk/RTK_OBJS.o $(obj)/RTK_OBJS_preb.o
+	cp $(srctree)/../obj.$(MODEL)/uboot/drivers/net/bcmbca/rtk/RTK_OBJS.o $(obj)/RTK_OBJS_preb.o