diff --git a/fake_hardware.h b/fake_hardware.h
index 4351e2c..97ab8dd 100644
--- a/fake_hardware.h
+++ b/fake_hardware.h
@@ -5,6 +5,8 @@
 #ifndef CHROMEOS_PLATFORM_UPDATE_ENGINE_FAKE_HARDWARE_H__
 #define CHROMEOS_PLATFORM_UPDATE_ENGINE_FAKE_HARDWARE_H__
 
+#include <map>
+
 #include "update_engine/hardware_interface.h"
 
 namespace chromeos_update_engine {
@@ -13,7 +15,8 @@
 class FakeHardware : public HardwareInterface {
  public:
   FakeHardware()
-    : boot_device_("/dev/sdz5"),
+    : kernel_device_("/dev/sdz4"),
+      boot_device_("/dev/sdz5"),
       is_official_build_(true),
       is_normal_boot_mode_(true),
       hardware_class_("Fake HWID BLAH-1234"),
@@ -21,7 +24,18 @@
       ec_version_("Fake EC v1.0a") {}
 
   // HardwareInterface methods.
+  virtual const std::string BootKernelDevice() { return kernel_device_; }
   virtual const std::string BootDevice() { return boot_device_; }
+  virtual bool IsKernelBootable(const std::string& kernel_device,
+                                bool* bootable)
+      { std::map<std::string, bool>::const_iterator i =
+            is_bootable_.find(kernel_device);
+        *bootable = (i != is_bootable_.end()) ? i->second : true;
+        return true; }
+
+  virtual bool MarkKernelUnbootable(const std::string& kernel_device)
+      { is_bootable_[kernel_device] = false; return true;}
+
   virtual bool IsOfficialBuild() { return is_official_build_; }
   virtual bool IsNormalBootMode() { return is_normal_boot_mode_; }
   virtual std::string GetHardwareClass() { return hardware_class_; }
@@ -54,7 +68,9 @@
   }
 
  private:
+  std::string kernel_device_;
   std::string boot_device_;
+  std::map<std::string, bool> is_bootable_;
   bool is_official_build_;
   bool is_normal_boot_mode_;
   std::string hardware_class_;