As I understand it, the order of PCI card detection is determined by the
motherboard PCI BIOS (it is 32 bit, and Linux calls into it per the PCI spec
to find PCI cards).
Some BIOSes have a setting to reverse the PCI bus scan order. The Linux
kernel also has a compilation option to reverse the scan order, for those
BIOSes which scan the bus "backwards" and don't provide a setting to reverse
it.
-- brandon s. allbery [os/2][linux][solaris][japh] allbery@kf8nh.apk.net system administrator [WAY too many hats] allbery@ece.cmu.edu electrical and computer engineering carnegie mellon university (bsa@kf8nh is still valid.)
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