diff --git a/src/cpu/o3/fetch_impl.hh b/src/cpu/o3/fetch_impl.hh
index a430f4472..4045492ca 100644
--- a/src/cpu/o3/fetch_impl.hh
+++ b/src/cpu/o3/fetch_impl.hh
@@ -357,6 +357,8 @@ DefaultFetch<Impl>::processCacheCompletion(PacketPtr pkt)
         return;
     }
 
+    memcpy(cacheData[tid], pkt->getPtr<uint8_t *>(), cacheBlkSize);
+
     if (!drainPending) {
         // Wake up the CPU (if it went to sleep and was waiting on
         // this completion event).
@@ -553,7 +555,7 @@ DefaultFetch<Impl>::fetchCacheLine(Addr fetch_PC, Fault &ret_fault, unsigned tid
         // Build packet here.
         PacketPtr data_pkt = new Packet(mem_req,
                                         Packet::ReadReq, Packet::Broadcast);
-        data_pkt->dataStatic(cacheData[tid]);
+        data_pkt->dataDynamic(new uint8_t[cacheBlkSize]);
 
         cacheDataPC[tid] = fetch_PC;
 
diff --git a/src/python/m5/main.py b/src/python/m5/main.py
index 904b241ca..54c54c1d5 100644
--- a/src/python/m5/main.py
+++ b/src/python/m5/main.py
@@ -119,6 +119,8 @@ add_option('-d', "--outdir", metavar="DIR", default=".",
     help="Set the output directory to DIR [Default: %default]")
 add_option('-i', "--interactive", action="store_true", default=False,
     help="Invoke the interactive interpreter after running the script")
+add_option("--pdb", action="store_true", default=False,
+    help="Invoke the python debugger before running the script")
 add_option('-p', "--path", metavar="PATH[:PATH]", action='append', split=':',
     help="Prepend PATH to the system path when invoking the script")
 add_option('-q', "--quiet", action="count", default=0,
@@ -283,11 +285,23 @@ def main():
     objects.ExecutionTrace.print_fetchseq = options.print_fetch_seq
     objects.ExecutionTrace.print_cpseq = options.print_cpseq
 
-    scope = { '__file__' : sys.argv[0] }
     sys.argv = arguments
     sys.path = [ os.path.dirname(sys.argv[0]) ] + sys.path
-    exec("import readline", scope)
-    execfile(sys.argv[0], scope)
+
+    scope = { '__file__' : sys.argv[0] }
+
+    # we want readline if we're doing anything interactive
+    if options.interactive or options.pdb:
+        exec("import readline", scope)
+
+    # if pdb was requested, execfile the thing under pdb, otherwise,
+    # just do the execfile normally
+    if options.pdb:
+        from pdb import Pdb
+        debugger = Pdb()
+        debugger.run('execfile("%s")' % sys.argv[0], scope)
+    else:
+        execfile(sys.argv[0], scope)
 
     # once the script is done
     if options.interactive: