--- a/init/do_mounts.c
+++ b/init/do_mounts.c
@@ -378,6 +378,7 @@ void __init prepare_namespace(void)
 	if (saved_root_name[0]) {
 		root_device_name = saved_root_name;
 		if (!strncmp(root_device_name, "mtd", 3) ||
+		    !strncmp(root_device_name, "mmc", 3) ||
 		    !strncmp(root_device_name, "ubi", 3)) {
 			mount_block_root(root_device_name, root_mountflags);
 			goto out;