--- old/src/cpu/sparc/vm/vm_version_sparc.cpp	2015-03-11 17:09:29.653240659 +0000
+++ new/src/cpu/sparc/vm/vm_version_sparc.cpp	2015-03-11 17:09:29.534244326 +0000
@@ -356,6 +356,12 @@
     (cache_line_size > ContendedPaddingWidth))
     ContendedPaddingWidth = cache_line_size;
 
+  // This machine does not allow unaligned memory accesses
+  if (! FLAG_IS_DEFAULT(UseUnalignedAccesses)) {
+    warning("Unaligned memory access is not available on this CPU");
+    FLAG_SET_DEFAULT(UseUnalignedAccesses, false);
+  }
+
 #ifndef PRODUCT
   if (PrintMiscellaneous && Verbose) {
     tty->print_cr("L1 data cache line size: %u", L1_data_cache_line_size());