diff --git a/drivers/char/tpm/tpm_tis.c b/drivers/char/tpm/tpm_tis.c
index 1cb5a7f..9c0727b 100644
--- a/drivers/char/tpm/tpm_tis.c
+++ b/drivers/char/tpm/tpm_tis.c
@@ -52,6 +52,8 @@
 };
 
 enum tis_defaults {
+	TIS_MEM_BASE = 0xFED4000,
+	TIS_MEM_LEN = 0x5000,
 	TIS_SHORT_TIMEOUT = 750, /* ms */
 	TIS_LONG_TIMEOUT = 2000, /* 2 sec */
 };
@@ -437,6 +439,11 @@
 	start = pnp_mem_start(pnp_dev, 0);
 	len = pnp_mem_len(pnp_dev, 0);
 
+	if (!start)
+		start = TIS_MEM_BASE;
+	if (!len)
+		len = TIS_MEM_LEN;
+
 	if (!(chip = tpm_register_hardware(&pnp_dev->dev, &tpm_tis)))
 		return -ENODEV;