Index: sys/dev/xen/bus/xenpv.c
===================================================================
--- sys/dev/xen/bus/xenpv.c
+++ sys/dev/xen/bus/xenpv.c
@@ -61,7 +61,7 @@
 #elif defined(__i386__)
 #define LOW_MEM_LIMIT	0x100000ul
 #else
-#error "Unsupported architecture"
+#define LOW_MEM_LIMIT	0x0ul
 #endif
 
 static devclass_t xenpv_devclass;