diff --git a/runtime/fault_handler.cc b/runtime/fault_handler.cc
index 283faa2..1304b04 100644
--- a/runtime/fault_handler.cc
+++ b/runtime/fault_handler.cc
@@ -35,13 +35,6 @@
 // Static fault manger object accessed by signal handler.
 FaultManager fault_manager;
 
-extern "C" {
-void art_sigsegv_fault() {
-  // Set a breakpoint here to be informed when a SIGSEGV is unhandled by ART.
-  LOG(ERROR)<< "Caught unknown SIGSEGV in ART fault handler";
-}
-}
-
 // Signal handler called on SIGSEGV.
 static void art_fault_handler(int sig, siginfo_t* info, void* context) {
   fault_manager.HandleFault(sig, info, context);
@@ -82,10 +75,7 @@
       return;
     }
   }
-
-  // Allow the user to catch this problem with a simple breakpoint in art_sigsegv_fault.
-  art_sigsegv_fault();
-
+  LOG(ERROR)<< "Caught unknown SIGSEGV in ART fault handler";
   oldaction_.sa_sigaction(sig, info, context);
 }
 
diff --git a/runtime/parsed_options.cc b/runtime/parsed_options.cc
index 3671225..80483f9 100644
--- a/runtime/parsed_options.cc
+++ b/runtime/parsed_options.cc
@@ -254,7 +254,7 @@
 #ifdef HAVE_ANDROID_OS
   {
     char buf[PROP_VALUE_MAX];
-    property_get("dalvik.vm.implicit_checks", buf, "null,stack");
+    property_get("dalvik.vm.implicit_checks", buf, "none");
     std::string checks(buf);
     std::vector<std::string> checkvec;
     Split(checks, ',', checkvec);
diff --git a/runtime/runtime.cc b/runtime/runtime.cc
index cbd51d4..027feee 100644
--- a/runtime/runtime.cc
+++ b/runtime/runtime.cc
@@ -535,20 +535,9 @@
     GetInstrumentation()->ForceInterpretOnly();
   }
 
-  bool implicit_checks_supported = false;
-  switch (kRuntimeISA) {
-  case kArm:
-  case kThumb2:
-    implicit_checks_supported = true;
-    break;
-  default:
-    break;
-  }
-
-  if (implicit_checks_supported &&
-    (options->explicit_checks_ != (ParsedOptions::kExplicitSuspendCheck |
+  if (options->explicit_checks_ != (ParsedOptions::kExplicitSuspendCheck |
         ParsedOptions::kExplicitNullCheck |
-        ParsedOptions::kExplicitStackOverflowCheck) || kEnableJavaStackTraceHandler)) {
+        ParsedOptions::kExplicitStackOverflowCheck) || kEnableJavaStackTraceHandler) {
     fault_manager.Init();
 
     // These need to be in a specific order.  The null point check handler must be