fix partial writes with a functional memory hack

figure out the block size from devices attached to the bus otherwise use a default block size when no devices that care are attached

configs/common/FSConfig.py:
src/mem/bridge.cc:
src/mem/bridge.hh:
src/python/m5/objects/Bridge.py:
    fix partial writes with a functional memory hack
src/mem/bus.cc:
src/mem/bus.hh:
src/python/m5/objects/Bus.py:
    figure out the block size from devices attached to the bus otherwise use a default block size when no devices that care are attached
src/mem/packet.cc:
    fix WriteInvalidateResp to not be a request that needs a response since it isn't
src/mem/port.hh:
    by default return 0 for deviceBlockSize instead of panicing. This makes finding the block size the bus should use easier

--HG--
extra : convert_revision : 3fcfe95f9f392ef76f324ee8bd1d7f6de95c1a64

src/python/m5/objects/Bridge.py

@@ -9,3 +9,5 @@ class Bridge(MemObject):
     queue_size_b = Param.Int(16, "The number of requests to buffer")
     delay = Param.Latency('0ns', "The latency of this bridge")
     write_ack = Param.Bool(False, "Should this bridge ack writes")
+    fix_partial_write_a = Param.Bool(False, "Should this bridge fixup partial block writes")
+    fix_partial_write_b = Param.Bool(False, "Should this bridge fixup partial block writes")

src/python/m5/objects/Bus.py

@@ -11,6 +11,7 @@ class Bus(MemObject):
     clock = Param.Clock("1GHz", "bus clock speed")
     width = Param.Int(64, "bus width (bytes)")
     responder_set = Param.Bool(False, "Did the user specify a default responder.")
+    block_size = Param.Int(64, "The default block size if one isn't set by a device attached to the bus.")
     if build_env['FULL_SYSTEM']:
         responder = BadAddr(pio_addr=0x0, pio_latency="1ps")
         default = Port(Self.responder.pio, "Default port for requests that aren't handled by a device.")