[OpenBIOS] PCI setup code

Jeff Garzik jgarzik at mandrakesoft.com
Thu Mar 30 18:03:03 CEST 2000

Martin Mares wrote:
> Hello!
> > It sounds like 2.2.x is relying on BIOS setup of PCI space even for the
> > PCI_DIRECT case.
>    Of course, the direct mode modifies only the way of accessing the
> configuration registers, not how does the kernel interpret their
> contents.
>    2.3.x might do better, but only for resources (and only in simple
> cases -- it doesn't know how to allocate space to bus bridges if the
> BIOS forgets to do it), not for IRQ's.
> > It is likely that 2.3.x needs this as well to some extent, but I can
> > almost promise you that 2.3.x will behave more sanely when faced with
> > the lack of BIOS setup...  The 2.3.x kernel PCI code has a ton of
> > fixup-handling code already, which would be very similar to handling the
> > completely-lack-of-BIOS case.   It shouldn't be very hard at all to get
> > the PCI code completely independent of BIOS PCI setup -- if that hasn't
> > happened already, that is.
>    If you want, I can look at the OpenBIOS and write some PCI setup
> code for it.

Here's a plug for the STPC-based BIOS sources... :) 

Jeff Garzik              | Tact is the ability to tell a man 
Building 1024            | he has an open mind when he has a
MandrakeSoft, Inc.       | hole in his head.  (-random fortune)
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