mkdir /var/javastation/root
Note: that this is Woody (Debian 3.0). At the time I was installing, Woody was the stable version. You can also try to use a more recent version (for example Debian 3.1), but I have no experience with that. You can also install Debian 3.0 and afterwards upgrade it to Debian 3.1.
cd /var/javastation
tar xzvf path/root.tar.gz
cd /tftpboot
ln -s /var/javastation/debian-sparc-root/ 192.168.1.3
Where 192.168.1.3 is the IP-address of your javastation
pts/597 root /tftpboot# ls -l total 1814 lrwxrwxrwx 1 root root 10 Jul 24 11:41 08002095270C -> proll.aout lrwxrwxrwx 1 root root 35 Jul 24 11:35 192.168.1.3 -> /var/javastation/debian-sparc-root/ lrwxrwxrwx 1 root root 12 Jul 24 11:42 C0A80103.PROL -> vmlinux.aout -rw-r--r-- 1 root root 94024 Jul 24 11:40 proll.aout -rw-r--r-- 1 root root 1758272 Jul 24 11:42 vmlinux.aout
cd /var/javastation/debian-sparc-root/etc
cp /etc/resolv.conf .
add /dev/root / nfs default 0 0