Index: head/stand/efi/include/efilib.h
===================================================================
--- head/stand/efi/include/efilib.h
+++ head/stand/efi/include/efilib.h
@@ -90,6 +90,7 @@
 bool efi_devpath_is_prefix(EFI_DEVICE_PATH *, EFI_DEVICE_PATH *);
 CHAR16 *efi_devpath_name(EFI_DEVICE_PATH *);
 void efi_free_devpath_name(CHAR16 *);
+bool efi_devpath_same_disk(EFI_DEVICE_PATH *, EFI_DEVICE_PATH *);
 EFI_DEVICE_PATH *efi_devpath_to_media_path(EFI_DEVICE_PATH *);
 UINTN efi_devpath_length(EFI_DEVICE_PATH *);
 EFI_DEVICE_PATH *efi_name_to_devpath(const char *path);
Index: head/stand/efi/libefi/devpath.c
===================================================================
--- head/stand/efi/libefi/devpath.c
+++ head/stand/efi/libefi/devpath.c
@@ -197,14 +197,19 @@
 	return (true);
 }
 
-bool
-efi_devpath_match(EFI_DEVICE_PATH *devpath1, EFI_DEVICE_PATH *devpath2)
+static bool
+_efi_devpath_match(EFI_DEVICE_PATH *devpath1, EFI_DEVICE_PATH *devpath2,
+    bool ignore_media)
 {
 
 	if (devpath1 == NULL || devpath2 == NULL)
 		return (false);
 
 	while (true) {
+		if (ignore_media &&
+		    IsDevicePathType(devpath1, MEDIA_DEVICE_PATH) &&
+		    IsDevicePathType(devpath2, MEDIA_DEVICE_PATH))
+			return (true);
 		if (!efi_devpath_match_node(devpath1, devpath2))
 			return false;
 		if (IsDevicePathEnd(devpath1))
@@ -213,6 +218,25 @@
 		devpath2 = NextDevicePathNode(devpath2);
 	}
 	return (true);
+}
+/*
+ * Are two devpaths identical?
+ */
+bool
+efi_devpath_match(EFI_DEVICE_PATH *devpath1, EFI_DEVICE_PATH *devpath2)
+{
+	return _efi_devpath_match(devpath1, devpath2, false);
+}
+
+/*
+ * Like efi_devpath_match, but stops at when we hit the media device
+ * path node that specifies the partition information. If we match
+ * up to that point, then we're on the same disk.
+ */
+bool
+efi_devpath_same_disk(EFI_DEVICE_PATH *devpath1, EFI_DEVICE_PATH *devpath2)
+{
+	return _efi_devpath_match(devpath1, devpath2, true);
 }
 
 bool