1 files changed, 38 insertions, 0 deletions
diff --git a/src/lib/boot_device.c b/src/lib/boot_device.c
new file mode 100644
index 0000000000..e0353fc1ab
--- /dev/null
+++ b/src/lib/boot_device.c
@@ -0,0 +1,38 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2015 Google Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc.
+ */
+
+#include <boot_device.h>
+
+void __attribute__((weak)) boot_device_init(void)
+{
+	/* Provide weak do-nothing init. */
+}
+
+int boot_device_ro_subregion(const struct region *sub,
+				struct region_device *subrd)
+{
+	const struct region_device *boot_dev;
+
+	boot_dev = boot_device_ro();
+
+	if (boot_dev == NULL)
+		return -1;
+
+	return rdev_chain(subrd, boot_dev, region_offset(sub), region_sz(sub));
+}