Default HTC Clic Diagnostics - F/T1 test mode

Hi.

I've come across a HTC Clic Diagnostics HBoot. Besides many other things, it has a test mode called "F/T1 Test". When selected, this options asks for a USB connection (from the Tattoo to a PC). Under Linux, this registers as a USB serial port, but I haven't been able to "talk" with the Tattoo yet.

As anyone ever come across such a feature ? Any tips on setting up the connection, so that I can talk to the Tattoo, from Linux ?

Thanks