I have Billionton cf gps card, which worked just out of the box when using
OpenZaurus 3.5.4.1, cat /dev/ttyS3 and it started sptting NMEA codes to screen.

Has anyone managed to get this working in pdaXii13? I tried googling, but I'm not
sure if it is supported in 2.4 kernels.

Last lines from dmesg:

ttyS03 unloaded
pxa_pcmcia_init(0)
ttyS03 at port 0xf60003f8 (irq = 135) is a 16550A
pxa_pcmcia_suspend(0)

In OpenBox panel it is Serial or Modem.

Well, if anyone is interested, I got it working by copying the serial_cs module from
Cacko (same kernel version). After loading that and changing ttyS3 speed to 4800
and starting gpsd, I get readings from telnet port 2947 which was my goal.
(cat /dev/ttyS3 does not work, but that is not an issue.)

Only minor thing is that I have to load serial_cs by hand, ie. it does not load when
the gps card is plugged in. I'll try to figure that out if I find time.