Non Standard Baud Rates?

Hi, I'm trying to get the burst_ind branch working at the higher speed baud rates. I have a USB to Serial FTDI Cable (FT232R) plus the T191. This setup works fine with the main trunk of osmocombb. When I fire up osmocon, layer1 appears to download to the phone and runs successfully. Osmocon then logs 'Received DOWNLOAD ACK from phone, your code is running now!'. The phone has layer1.bin displayed as usual. However it goes no further and just hangs. Could anyone please give any advice on what to try next? Thanks, Matt.