diff -r 3ad80c3ab77b -r 8aa1e72960a6 src/mem/packet.hh
--- a/src/mem/packet.hh	Mon Jan 10 15:50:51 2011 -0800
+++ b/src/mem/packet.hh	Mon Jan 10 16:00:49 2011 -0800
@@ -768,6 +768,12 @@
         data = new uint8_t[getSize()];
     }
 
+    /** Identifies whether static or dynamic data has been allocated. */
+    bool
+    hasDataAllocated()
+    {
+        return flags.isSet(STATIC_DATA|DYNAMIC_DATA);
+    }
 
     /**
      * Check a functional request against a memory value represented
diff -r 3ad80c3ab77b -r 8aa1e72960a6 src/mem/ruby/system/DMASequencer.cc
--- a/src/mem/ruby/system/DMASequencer.cc	Mon Jan 10 15:50:51 2011 -0800
+++ b/src/mem/ruby/system/DMASequencer.cc	Mon Jan 10 16:00:49 2011 -0800
@@ -97,8 +97,10 @@
     msg->getLen() = (offset + len) <= RubySystem::getBlockSizeBytes() ?
         len : RubySystem::getBlockSizeBytes() - offset;
 
-    if (write) {
-        msg->getDataBlk().setData(data, offset, msg->getLen());
+    if (write && (data != NULL)) {
+        if (active_request.data != NULL) {
+            msg->getDataBlk().setData(data, offset, msg->getLen());
+        }
     }
 
     assert(m_mandatory_q_ptr != NULL);
@@ -160,8 +162,10 @@
     if (active_request.bytes_completed == 0)
         offset = active_request.start_paddr & m_data_block_mask;
     assert(active_request.write == false);
-    memcpy(&active_request.data[active_request.bytes_completed],
-           dblk.getData(offset, len), len);
+    if (active_request.data != NULL) {
+        memcpy(&active_request.data[active_request.bytes_completed],
+               dblk.getData(offset, len), len);
+    }
     issueNext();
 }
 
diff -r 3ad80c3ab77b -r 8aa1e72960a6 src/mem/ruby/system/RubyPort.cc
--- a/src/mem/ruby/system/RubyPort.cc	Mon Jan 10 15:50:51 2011 -0800
+++ b/src/mem/ruby/system/RubyPort.cc	Mon Jan 10 16:00:49 2011 -0800
@@ -245,7 +245,12 @@
         }
     }
 
-    RubyRequest ruby_request(pkt->getAddr(), pkt->getPtr<uint8_t>(),
+    uint8_t* ruby_data = NULL;
+    if (pkt->hasDataAllocated()) {
+        ruby_data = pkt->getPtr<uint8_t>();
+    }
+
+    RubyRequest ruby_request(pkt->getAddr(), ruby_data,
                              pkt->getSize(), pc, type,
                              RubyAccessMode_Supervisor, pkt);