mmap (segmentation fault) on Dell Dimension 4550

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Using mmap to map PCI base address registers to user space.  Redhat 9,
2.4.20-8.  Works fine on generic computer with Award BIOS.  Doesn't work
on Dell Dimension 4550 as any access to the mapped memory location
causes a segmentation fault.  Dell's BIOS is rather minimal.

Any ideas?

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