It's an O2Micro bridge issue, maybe fixed in latest drivers 

Forum: 3Com PCMCIA Ethernet Adapter Issues
Re: 3Com 3CCFE575 (Cristian Grigoriu)
Date: 2000, Jan 21
From: David Hinds <dhinds@pcmcia.sourceforge.org>

Try building the latest beta driver package (on sourceforge.org in /pcmcia/NEW). -- Dave

Messages Inline: Outline:

1. Same problem with kernel 2.2.14 & pcmcia-cs 3.1.14 by Gregory Ade, 2000, Apr 20

to: "It's an O2Micro bridge issue, maybe fixed in latest drivers"