pci <-> device node mapping

Anton Blanchard anton at samba.org
Wed Jun 18 07:47:21 EST 2003

> This is an unrelated issue, but what is the story for numbering/renumbering
> PCI Id's?  In kernel-2.4.19, PHB's seem to chew up 256 PCI id's (for 4 slots)
> and there are some machine configurations which have nearly a hundred PHB's.
> In one unhappy situation, we had a machine with a graphics card which
> ended up with a PCI Id of 4097, and the default X11 couldn't find it,
> and so X wouldn't run.  For some reason, X feels a need to scan the
> PCI bus.  Changing X to scan up to 19,000 bus ID's (the theoretical
> max for this box) caused X to take 20 seconds to come up.

Yuck. Check out the thread on linux-kernel called "pci_domain_nr vs.
/sys/devices". We are hashing out the final bits of pci domains which
should solve that problem.



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