diff -r 83d5112e71dd -r 2004e1196b26 configs/example/ruby_fs.py
--- a/configs/example/ruby_fs.py	Tue Apr 23 09:47:52 2013 -0400
+++ b/configs/example/ruby_fs.py	Tue Apr 23 17:05:58 2013 +0100
@@ -82,10 +82,13 @@
 
 CPUClass.clock = options.clock
 
+TestMemClass = Simulation.setMemClass(options)
+
 if buildEnv['TARGET_ISA'] == "alpha":
-    system = makeLinuxAlphaRubySystem(test_mem_mode, bm[0])
+    system = makeLinuxAlphaRubySystem(test_mem_mode, TestMemClass, bm[0])
 elif buildEnv['TARGET_ISA'] == "x86":
-    system = makeLinuxX86System(test_mem_mode, options.num_cpus, bm[0], True)
+    system = makeLinuxX86System(test_mem_mode, TestMemClass,
+                                options.num_cpus, bm[0], True)
     Simulation.setWorkCountOptions(system, options)
 else:
     fatal("incapable of building non-alpha or non-x86 full system!")