pcibios_find_device returns zero base address?

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I am looking at a problem with pcibios_find_device returning a zero base
address for a PCI-CardBus bridge. Looking at arch/i386/kernel/bios32.c,
the kernel simply calls the BIOS for the information, making me realize
that either a) there is something that the kernel module I am working in
needs to do some setup for the call first (unlikely) or b) the BIOS on
this machine is somehow just a bit screwy.

I'd like to take this offline with someone who has an understanding of
PCI subsystem nitty-gritty, any takers?

Thanks,

-B

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