Normally you can download PROLL here. However, because this PROLL didn't work with my self-compiled 2.4.26-kernel, I have changed 1 line in the source of PROLL and re-compiled PROLL. You can download this 'patched' PROLL here
ln -s proll.aout 08002095270C
where 08002095270C is the Hardware Address of your javastation.
Also, if you check your logfiles (ex. /var/log/syslog) you should see something like this :
in.tftpd[21841]: connect from 192.168.1.3 (192.168.1.3) tftpd[21842]: tftpd: trying to get file: /tftpboot/08002095270C in.tftpd[21843]: connect from 192.168.1.3 (192.168.1.3) tftpd[21844]: tftpd: trying to get file: C0A80103.PROL