Re: PCI in 2.4.1

[Geert U. <ge...@li...>]

On Fri, 9 Feb 2001, Sven LUTHER wrote:

> On Fri, Feb 09, 2001 at 09:53:59AM +0100, Glenn Hisdal wrote:
> > Sven LUTHER wrote:
> > > 
> > > On Wed, Feb 07, 2001 at 06:57:51PM +0100, Glenn Hisdal wrote:
> > > > Hi,
> > > >
> > > > I have just tried a 2.4.1 kernel with PCI support enabled.
> > 
> > > > apus_pci: apus_setup_pci_ptrs: Phase5 B/CVisionPPC PCI bridge detected.
> > > >
> > > > APUS: BATs=1, BUS=67MHz, RAM=70ns, PCI bridge=1
> > > >
> > > > PCI: Probing PCI hardware
> > > 
> > > Erm, ...
> > > 
> > > what is the content of /proc/pci, i think it is empty.
> > 
> > /proc/pci doesn't exist at all.
> 
> Ok ...
> 
> > > Notice that pci code seems to be broken on 2.4 kernels right now (well for
> > > apus-pci anyway, not the generic pci code naturally).
> > 
> > > Help is wanted to fix this, you volunteer ?
> > 
> > I'm not sure how much I can help with the coding.
> > If someone can point me in the right direction, and give me some info on
> > the implementation of the pci code, I could have a look, but I doubt
> > I'll be able to fix anything. Think it may be a bit lowlevel for me...
> 
> Did we not all begin like that, ...
> 
> Just have a look, and read the docs.
> 
> Not sure even if it all that low level, Michel, any hint on that ?

As an example, you can take a look at all `gg2' stuff in
arch/ppc/kernel/chrp_pci.c. It's known to work fine on my PPC box.

Basically you need to know
  - how to access PCI config space (old code knew)
  - wehere PCI memory and I/O space are located, to set up the bus resources.

And enable all DEBUG code in drivers/pci/*.c and arch/ppc/kernel/pci.c.

Good luck!

Gr{oetje,eeting}s,

						Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- ge...@li...

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
							    -- Linus Torvalds