modprobe hostap_pci locks up machine

[Ian Goldberg]

A friend of mine has a DWL-520:

00:08.0 Network controller: Intersil Corporation Prism 2.5 Wavelan chipset (rev 01)
        Subsystem: D-Link System Inc DWL-520 Wireless PCI Adapter, Rev E1
        Flags: bus master, medium devsel, latency 32, IRQ 11
        Memory at dddff000 (32-bit, prefetchable) [size=4K]
        Capabilities: [dc] Power Management version 2

She's trying to get it to work with hostap (though she only needs it to
be a station, not an AP).  The machine (a Soyo barebones:
http://www.tigerdirect.com/applications/searchtools/item-Details.asp?EdpNo=713514&sku=S450-3200)
running FC3 (kernel 2.6.9) locks up hard when she does modprobe hostap_pci.

She's a Linux newbie, so she enlisted my help.  I put a whole lot of
printk's in the hostap_pci.c file, and it's locking up during the call
to HFA384X_INB(HFA384X_PCICOR_OFF) in prism2_pci_cor_sreset.
The readb(0x2091804c) causes it to crash.
0x2091804c == dev->mem_start + 0x4c (HFA384X_PCICOR_OFF).

I'm at a complete loss as to how to proceed from here.  Any help?

[The debugging was with 0.3.0, but 0.2.0 displays the same lockup.]

Thanks,

   - Ian