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-rw-r--r--src/drivers/pc80/tpm/tis.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/src/drivers/pc80/tpm/tis.c b/src/drivers/pc80/tpm/tis.c
index 6b84614c88..f7d9d6f152 100644
--- a/src/drivers/pc80/tpm/tis.c
+++ b/src/drivers/pc80/tpm/tis.c
@@ -2,6 +2,7 @@
* This file is part of the coreboot project.
*
* Copyright (C) 2011 The Chromium OS Authors. All rights reserved.
+ * Copyright (C) 2018 Eltan B.V.
*
* 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
@@ -911,7 +912,8 @@ static void lpc_tpm_fill_ssdt(struct device *dev)
acpigen_write_name("_CRS");
acpigen_write_resourcetemplate_header();
acpigen_write_mem32fixed(1, CONFIG_TPM_TIS_BASE_ADDRESS, 0x5000);
- acpigen_write_io16(port, port, 1, 2, 1);
+ if (port)
+ acpigen_write_io16(port, port, 1, 2, 1);
if (CONFIG_TPM_PIRQ) {
/*