I haven't really tested the GPS itself, I just know that it's detected and shows up as a serial port. The acm, usbserial and pl2303 compiled modules are attached. Some basic instructions are below, I don't think you can brick the device with them but be careful anyway:
1. Put the files into /lib/modules/2.4.19-rmk7-pxa2-irex1/kernel/drivers/usb/ and run "depmod -a".
2. My USB GPS has a Prolific 2303 chip for the USB to Serial conversion, so I just did "modprobe usbserial", "modprobe pl2303" and then popped it into the USB port at the top of the device. Run "dmesg" and look at the bottom of the output to see if it's been detected.
3. For the modem, I did "modprobe usbserial vendor=0x0af0 product=0x6600" (where Vendor 0x0af0 and Product 0x6600 are the details for my Orange 3G modem (it's a branded Option GlobeSurfer Icon modem) ). Then I plugged the modem into the port on the top of the device. The modem will make 3 ports appear on your device (ttyUSB0, ttyUSB1 and ttyUSB2 if I remember correctly).
I've also compiled the ACM driver in order to connect a CDMA modem that I have here but haven't tested this yet.
Anyway, I also think a GPS application would be interesting to have on the iLiad, it would be like a paper map (more or less
).
Enjoy!
Razvan