Problem resolved 

Forum: PCMCIA Installation and Configuration Issues
Re: PCIC probe failed (but worked fine yesterday) (Shiv Sikand)
Date: 2000, Apr 24
From: David Hinds <dhinds@pcmcia.sourceforge.org>

Starting up with CORE_OPTS="cb_mem_base=0x50103000" seems to have fixed the problem. I'm still not sure what caused it in the first place, but the BIOS seems to be mis-configuring the CardBus bridge. -- Dave