Subject: Re: PCI IO range limitation

From: Benjamin Herrenschmidt <[email-masked]>
Date: Fri, 29 Jun 2007 10:13:16 +1000

On Fri, 2007-06-29 at 00:38 +0100, Matt Sealey wrote:
> Benjamin Herrenschmidt wrote:
> > On Thu, 2007-06-28 at 12:20 +0200, Marian Balakowicz wrote:
> >> Hi,
> >>
> >> Trying to change PCI IO window base for 52xx target I found that
> >> we are pretty much limited to a "0" offset only.
> > 
> > We just fixed that for 64 bits but 32 bits still has the limitation.
> > Note that it's not a very good idea to have your IO range at !0 if
> > you're going to use anything ISA-like, such as a VGA video card or other
> > legacy devices behind a PCI southbridge or SuperIO.
> 
> The chances of that on an MPC52xx platform are practically zero, aren't
> they?

Euh... don't you use VGA video cards on Efika ? :-)

Ben.