Config: Cause a fatal() when a parameter without a default value isn't set(FS #315).

src/cpu/BaseCPU.py

@@ -69,7 +69,7 @@ class BaseCPU(MemObject):
     function_trace = Param.Bool(False, "Enable function trace")
     function_trace_start = Param.Tick(0, "Cycle to start function trace")
 
-    checker = Param.BaseCPU("checker CPU")
+    checker = Param.BaseCPU(NULL, "checker CPU")
 
     do_checkpoint_insts = Param.Bool(True,
         "enable checkpoint pseudo instructions")

src/dev/DiskImage.py

@@ -42,3 +42,4 @@ class CowDiskImage(DiskImage):
     child = Param.DiskImage(RawDiskImage(read_only=True),
                             "child image")
     table_size = Param.Int(65536, "initial table size")
+    image_file = ""

src/python/m5/SimObject.py

@@ -748,7 +748,8 @@ class SimObject(object):
         for param in param_names:
             value = self._values.get(param)
             if value is None:
-                continue
+                m5.fatal("%s.%s without default or user set value" \
+                        % (self.path(), param))
 
             value = value.getValue()
             if isinstance(self._params[param], VectorParamDesc):