Index: test/tools/lldb-server/TestLldbGdbServer.py
===================================================================
--- test/tools/lldb-server/TestLldbGdbServer.py
+++ test/tools/lldb-server/TestLldbGdbServer.py
@@ -667,7 +667,8 @@
             # Verify the response length.
             p_response = context.get("p_response")
             self.assertIsNotNone(p_response)
-            self.assertEquals(len(p_response), 2 * int(reg_info["bitsize"]) / 8)
+            if (p_response != 'E15'): # Check if register is available
+                self.assertEquals(len(p_response), 2 * int(reg_info["bitsize"]) / 8)
 
             # Increment loop
             reg_index += 1