Edit /etc/bootptab and add a line like :
old:ha=08002095270C:ip=192.168.1.3:bf=/tftpboot/08002095270C
where:
- 08002095270C is the Hardware Address of your javastation (printed on the back of the javastation)
- 192.168.1.3 is the IP-address that you like to give to your javastation.