Current Linux disables it and doesn't save the value.
> 2) In the O'reilly book Linux Drivers there are several routines for
> getting PCI interface information. An attempt to try some of the example
> code comes up with several routines as undefined. pcibios_strerror() is
> one, pcibios_find_device() is another, how do I get these functions defined?
Make sure your kernel is built with PCI support firstly. Also for 2.2 the
functions changed to a generic PCI interface
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