<<On Mon, 26 Jun 2000 11:29:39 +0100 (BST), Nick Hibma <[EMAIL PROTECTED]> said:

> I guess that the perfect solution is to be able to hardwire the PCI irqs
> in some way once FreeBSD is doing the PnP resource allocation.

On typical non-SMP motherboards, the PCI IRQs are hard-wired on the
motherboard.  That is to say, INTA of slot 13 is wire-OR'd with INTB of
slot 14, is wire-OR'd with INTC of slot 15, is wire-OR'd with INTD of
slot 16, and oh, yeah, is also wire-OR'd with INTA of every
on-motherboard device.

SMP motherboards tend to be significantly better in this regard.

The PCI BIOS includes a function which gives you the map of how
interrupts are wired together.


Garrett A. Wollman   | O Siem / We are all family / O Siem / We're all the same
[EMAIL PROTECTED]  | O Siem / The fires of freedom 
Opinions not those of| Dance in the burning flame
MIT, LCS, CRS, or NSA|                     - Susan Aglukark and Chad Irschick

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