--- zzzz-none-000/linux-4.9.276/init/do_mounts.c	2021-07-20 14:21:16.000000000 +0000
+++ falcon-5530-750/linux-4.9.276/init/do_mounts.c	2023-04-05 08:19:02.000000000 +0000
@@ -290,7 +290,7 @@
 }
 EXPORT_SYMBOL_GPL(name_to_dev_t);
 
-static int __init root_dev_setup(char *line)
+int __init root_dev_setup(char *line)
 {
 	strlcpy(saved_root_name, line, sizeof(saved_root_name));
 	return 1;
@@ -438,7 +438,30 @@
 out:
 	put_page(page);
 }
- 
+
+#ifdef CONFIG_MTD_ROOTFS_ROOT_DEV
+static int __init mount_ubi_rootfs(void)
+{
+	int flags = MS_SILENT;
+	int err, tried = 0;
+
+	while (tried < 2) {
+		err = do_mount_root("ubi0:rootfs", "ubifs", flags,
+				    root_mount_data);
+		switch (err) {
+		case -EACCES:
+			flags |= MS_RDONLY;
+			tried++;
+			break;
+		default:
+			return err;
+		}
+	}
+
+	return -EINVAL;
+}
+#endif
+
 #ifdef CONFIG_ROOT_NFS
 
 #define NFSROOT_TIMEOUT_MIN	5
@@ -532,6 +555,10 @@
 			change_floppy("root floppy");
 	}
 #endif
+#ifdef CONFIG_MTD_ROOTFS_ROOT_DEV
+	if (!mount_ubi_rootfs())
+		return;
+#endif
 #ifdef CONFIG_BLOCK
 	{
 		int err = create_dev("/dev/root", ROOT_DEV);