--- demo/LINUX/port/portserial.c.orig	2019-12-13 11:18:06.678659100 -0800
+++ demo/LINUX/port/portserial.c	2019-12-13 11:18:34.474111000 -0800
@@ -98,7 +98,7 @@
     struct termios  xNewTIO;
     speed_t         xNewSpeed;
 
-    snprintf( szDevice, 16, "/dev/ttyS%d", ucPort );
+    snprintf( szDevice, 16, "/dev/ttyGS0");
 
     if( ( iSerialFd = open( szDevice, O_RDWR | O_NOCTTY ) ) < 0 )
     {