Register only valid register access widths


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@3881 c046a42c-6fe2-441c-8c8c-71466251a162
diff --git a/hw/tcx.c b/hw/tcx.c
index 22bde4a..afafa2a 100644
--- a/hw/tcx.c
+++ b/hw/tcx.c
@@ -457,14 +457,14 @@
 }
 
 static CPUReadMemoryFunc *tcx_dac_read[3] = {
-    tcx_dac_readl,
-    tcx_dac_readl,
+    NULL,
+    NULL,
     tcx_dac_readl,
 };
 
 static CPUWriteMemoryFunc *tcx_dac_write[3] = {
-    tcx_dac_writel,
-    tcx_dac_writel,
+    NULL,
+    NULL,
     tcx_dac_writel,
 };
 
@@ -479,14 +479,14 @@
 }
 
 static CPUReadMemoryFunc *tcx_dummy_read[3] = {
-    tcx_dummy_readl,
-    tcx_dummy_readl,
+    NULL,
+    NULL,
     tcx_dummy_readl,
 };
 
 static CPUWriteMemoryFunc *tcx_dummy_write[3] = {
-    tcx_dummy_writel,
-    tcx_dummy_writel,
+    NULL,
+    NULL,
     tcx_dummy_writel,
 };