diff --git a/configs/common/FSConfig.py b/configs/common/FSConfig.py
index f1c905fd8..72cfcbb55 100644
--- a/configs/common/FSConfig.py
+++ b/configs/common/FSConfig.py
@@ -79,14 +79,14 @@ def makeLinuxAlphaSystem(mem_mode, mdesc = None):
 
     return self
 
-def makeLinuxAlphaRubySystem(mem_mode, phys_mem, mdesc = None):
+def makeLinuxAlphaRubySystem(mem_mode, mdesc = None):
     class BaseTsunami(Tsunami):
         ethernet = NSGigE(pci_bus=0, pci_dev=1, pci_func=0)
         ide = IdeController(disks=[Parent.disk0, Parent.disk2],
                             pci_func=0, pci_dev=0, pci_bus=0)
         
-
-    self = LinuxAlphaSystem(physmem = phys_mem)
+    physmem = PhysicalMemory(range = AddrRange(mdesc.mem()))
+    self = LinuxAlphaSystem(physmem = physmem)
     if not mdesc:
         # generic system
         mdesc = SysConfig()
@@ -100,7 +100,7 @@ def makeLinuxAlphaRubySystem(mem_mode, phys_mem, mdesc = None):
     # RubyPort currently does support functional accesses.  Therefore provide
     # the piobus a direct connection to physical memory
     #
-    self.piobus.port = phys_mem.port
+    self.piobus.port = physmem.port
 
     self.disk0 = CowIdeDisk(driveID='master')
     self.disk2 = CowIdeDisk(driveID='master')
diff --git a/configs/example/ruby_fs.py b/configs/example/ruby_fs.py
index 33f2fd0e5..5c508f6fe 100644
--- a/configs/example/ruby_fs.py
+++ b/configs/example/ruby_fs.py
@@ -116,12 +116,10 @@ FutureClass = None
 
 CPUClass.clock = options.clock
 
-physmem = PhysicalMemory()
-
-system = makeLinuxAlphaRubySystem(test_mem_mode, physmem, bm[0])
+system = makeLinuxAlphaRubySystem(test_mem_mode, bm[0])
 
 system.ruby = Ruby.create_system(options,
-                                 physmem,
+                                 system.physmem,
                                  system.piobus,
                                  system.dma_devices)