--- /dev/null
+--- a/drivers/serial/Makefile
++++ b/drivers/serial/Makefile
+@@ -3,6 +3,7 @@
+ #
+
+ obj-$(CONFIG_SERIAL_CORE) += serial_core.o
++obj-$(CONFIG_AMAZON_ASC_UART) += amazon_asc.o
+ obj-$(CONFIG_SERIAL_21285) += 21285.o
+
+ # These Sparc drivers have to appear before others such as 8250