No network connection with a Xircom RealPort Cardbus Ethernet 10/ 100 + Modem 56 (RBEM56G-100)

["Irish, Jon D MEVATEC" <jon.irish@us.army.mil>]

I just installed Debian 3.0r1 on a Gateway Solo 2500 with a Xircom RealPort
Cardbus Ethernet 10/100 + Modem 56 (RBEM56G-100)card in it. During the
install, it failed to setup networking as it claimed there was no adapter
present. I finished the install from the CD and logged in as root. Running
dmesg, I see this:

tulip_attach (device 20:00.0)
tulip.c:v0.91g-ppc 7/16/99 becker@scyld.com (modified by
danilo#cs.uni-magdeburg.de for XIRCOM CBE, fixed by Doug Ledford).
eth0: Xircom Cardbus Adapter (DEC 21143 compatible mode) rev 3 at 0x400,
00:10:A4:FB:53:D2, IRQ 10.
eth0: MII transceiver #0 config 3100 status 7809 advertising 01e1.

Then, lspci gives me this:

20:00.0 Ethernet controller: Xircom Cardbus Ethernet 10/100 (rev 03)

But ifconfig only shows a loopback adapter. Obiously, the system "sees" the
card, but it isn't be used. How can I fix this problem/

TIA,
Jon