diff -r f73034ecbeff -r b30da8fd99c0 src/mem/ruby/slicc_interface/AbstractController.cc
--- a/src/mem/ruby/slicc_interface/AbstractController.cc	Mon Feb 09 14:08:33 2015 -0600
+++ b/src/mem/ruby/slicc_interface/AbstractController.cc	Mon Feb 09 16:08:34 2015 -0600
@@ -247,7 +247,7 @@
                                             const DataBlock &block, int size)
 {
     RequestPtr req = new Request(addr.getAddress(),
-                                 RubySystem::getBlockSizeBytes(), 0,
+                                 size, 0,
                                  m_masterId);
 
     PacketPtr pkt = Packet::createWrite(req);
@@ -293,6 +293,12 @@
 
     std::shared_ptr<MemoryMsg> msg = std::make_shared<MemoryMsg>(clockEdge());
     (*msg).m_Addr.setAddress(pkt->getAddr());
+
+    if (pkt->isWrite()) {
+      (*msg).m_Addr.makeLineAddress(); // Align addresses with partial writes
+    }
+    assert((*msg).m_Addr.getAddress() == (*msg).m_Addr.getLineAddress());
+
     (*msg).m_Sender = m_machineID;
 
     SenderState *s = dynamic_cast<SenderState *>(pkt->senderState);