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Re: lift the ioport_resource limit ...

To: "Maciej W. Rozycki" <macro@ds2.pg.gda.pl>
Subject: Re: lift the ioport_resource limit ...
From: Geert Uytterhoeven <Geert.Uytterhoeven@sonycom.com>
Date: Thu, 10 May 2001 11:58:51 +0200 (MET DST)
Cc: Jun Sun <jsun@mvista.com>, Ralf Baechle <ralf@oss.sgi.com>, linux-mips@oss.sgi.com
In-reply-to: <Pine.GSO.3.96.1010510111734.10485A-100000@delta.ds2.pg.gda.pl>
Sender: owner-linux-mips@oss.sgi.com
On Thu, 10 May 2001, Maciej W. Rozycki wrote:
> On Wed, 9 May 2001, Jun Sun wrote:
> > The PCI IO space essentially extends the ISA bus, which effectively removes
> > the 0xffff limits.
> 
>  Note that while there is usually no problem with using addresses beyond
> 64kB in the PCI I/O space, certain PCI-to-PCI bridges may not pass such
> accesses across.  So it's best to avoid assigning and using them.  That's
> why Linux remaps "high" I/O space resources on Alpha, which get set up for
> some systems by the SRM console (firmware), e.g. in the system I was using
> a few years ago, SRM used to assign addresses around 0x11000 and 0x12000
> for the onboard network and SCSI devices, IIRC. 

Shouldn't that be reflected in the bridge's bus resources (pci_bus.resource[])?
Then the PCI resource validation/assignment code will (re)assign them when
necessary.

Gr{oetje,eeting}s,

                                                Geert

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Geert Uytterhoeven ------------- Sony Software Development Center Europe (SDCE)
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