diff --git a/include/configs/isvp_common.h b/include/configs/isvp_common.h
index 588cac86..e6eb7595 100644
--- a/include/configs/isvp_common.h
+++ b/include/configs/isvp_common.h
@@ -131,7 +131,9 @@
 
 #define CONFIG_SYS_UART_INDEX		1
 #define CONFIG_BAUDRATE			115200
-#define CONFIG_SYS_UART_CONTROLLER_STEP	0x1000
+#if defined(CONFIG_T21) || defined(CONFIG_T30) || defined(CONFIG_T31)
+    #define CONFIG_SYS_UART_CONTROLLER_STEP    0x1000
+#endif
 
 #define CONFIG_BOOTDELAY		1
 #define CONFIG_CMD_TFTPPUT		1