diff --git a/src/superio/winbond/w83977tf/early_serial.c b/src/superio/winbond/w83977tf/early_serial.c
deleted file mode 100644
index b3aa8ac665..0000000000
--- a/src/superio/winbond/w83977tf/early_serial.c
+++ /dev/null
@@ -1,43 +0,0 @@
-/*
- * This file is part of the coreboot project.
- *
- * Copyright (C) 2000 AG Electronics Ltd.
- * Copyright (C) 2003-2004 Linux Networx
- * Copyright (C) 2004 Tyan
- *
- * 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; either version 2 of the License, or
- * (at your option) any later version.
- *
- * 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.
- */
-
-#include <arch/io.h>
-#include "w83977tf.h"
-
-static void pnp_enter_ext_func_mode(pnp_devfn_t dev)
-{
-	u16 port = dev >> 8;
-	outb(0x87, port);
-	outb(0x87, port);
-}
-
-static void pnp_exit_ext_func_mode(pnp_devfn_t dev)
-{
-	u16 port = dev >> 8;
-	outb(0xaa, port);
-}
-
-static void w83977tf_enable_serial(pnp_devfn_t dev, u16 iobase)
-{
-	pnp_enter_ext_func_mode(dev);
-	pnp_set_logical_device(dev);
-	pnp_set_enable(dev, 0);
-	pnp_set_iobase(dev, PNP_IDX_IO0, iobase);
-	pnp_set_enable(dev, 1);
-	pnp_exit_ext_func_mode(dev);
-}