Alix Linux and missing serial port

I have a Alix motherboard [login to view URL] loaded with Linux from [login to view URL] The problem is that the serial port /dev/ttyS0 is not available and loaded.. Help me configure the kernel to have the serial port available.. (It has been shown and useable just yesterday ) the command tty gives /dev/tty1.. I belived it should say /dev/ttyS0 The reason is that a Java program should send out commands to a serial interface using the COM1/ttyS0 port. This program is already written by another RAC coder