Index: boot/arch/amd64/Makefile.inc
===================================================================
--- boot/arch/amd64/Makefile.inc	(revision 5dc96227c454d26dad2ed3642e8fb99b68d212c8)
+++ boot/arch/amd64/Makefile.inc	(revision df747b9ce545e1eda723dbd969461898e697c40b)
@@ -40,5 +40,6 @@
 	rootia32 \
 	pciintel \
-	isa
+	isa \
+	serial
 
 RD_DRV_CONF = \