I have an IBM ThinkPad 600X with the 10/100 EtherJet CardBus Ready Port Adapter with 56k Modem. I haven't attempted anything with the modem yet, but I got the NIC to work by adding this line to /etc/pcmcia/config
card "IBM 10/100 EtherJet CardBus Adapter with 56k Modem" manfid 0x00a4, 0x0103 bind "tulip_cb"
I got this info by running:
This has worked for me on RedHat 6.1 and Mandrake 7.0.