Arduino and PPC interfacing

Has anybody managed to overcome the difficulty of interfacing an Arduino Uno to a PPC/WM5 device for any purpose?

The difficulty appears to be that when the Arduino is connected to a Host USB port on an Acer WM5 device using the FTDI driver for ARM and a modified .INF file using the Arduino IDs, everything seems OK but the Port info in System Info shows the correct ID info but says that no device is connected. Other devices work.

If this is the incorrect forum please direct me to the right place.