I thought I'd post here (apologies if this is old news, but I couldn't find any reference elsewhere). I have a Xircom RealPort2 Cardbus Ethernet 10/100.
Details from syslog: "Xircom", "RealPort2 CardBus Ethernet 10/100", "R2BE-100BTX", "1.00" manfid: 0x0105, 0x0103 function: 6 (network)
I have this working successfully using the tulib_cb driver. I'm not sure of the format of the 'config' file but the following worked for me:
card "Xircom RealPort2 CardBus Ethernet 10/100" manfid 0x0105, 0x0103 bind "tulip_cb"
Hope this helps.