diff -r 865e37d507c7 -r a1a1b3ea55b5 configs/example/fs.py
--- a/configs/example/fs.py	Tue Nov 23 06:11:50 2010 -0500
+++ b/configs/example/fs.py	Tue Nov 23 06:33:02 2010 -0500
@@ -149,7 +149,10 @@
         mem_size = bm[0].mem()
     else:
         mem_size = SysConfig().mem()
-    test_sys.bridge.filter_ranges_a=[AddrRange(0, Addr.max)]
+    if buildEnv['TARGET_ISA'] == 'x86':
+        test_sys.bridge.filter_ranges_a=[AddrRange(0, Addr.max >> 4)]
+    else:
+        test_sys.bridge.filter_ranges_a=[AddrRange(0, Addr.max)]
     test_sys.bridge.filter_ranges_b=[AddrRange(mem_size)]
     test_sys.iocache = IOCache(addr_range=mem_size)
     test_sys.iocache.cpu_side = test_sys.iobus.port