We have a USB device required to run on Colibri T30 (flashed with latest image Linux colibri-t30 3.1.10-2.8.6+g37b9f033652b #1 SMP PREEMPT Mon Apr 1 13:13:50 UTC 2019 armv7l GNU/Linux ).
But it looks like the FTDI drivers are missing - usb-devices for that particular device displays:
In the default kernel, the driver for FTDI is not enabled, you need to compile a custom kernel by following the instructions on this site and the following configs enabled:
I have compiled a custom kernel with FTDI Single Port Serial Driver builtin (also added the USB debug option that came in handy). I have also enabled Elan U132 Adapter Host Controller and Elan PCMCIA CardBus Adapter USB Client due to their dependency.
I had to run insmod ftdi_elan first, followed by insmod ftdi_sio in order for the Bluetooth device to be mounted in /dev/ttyUSB0, as required by our software.