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Re: [PATCH]PCI on SWARM

To: Jes Sorensen <jes@wildopensource.com>
Subject: Re: [PATCH]PCI on SWARM
From: Ralf Baechle <ralf@linux-mips.org>
Date: Mon, 18 Oct 2004 21:15:07 +0200
Cc: "Maciej W. Rozycki" <macro@linux-mips.org>, Manish Lachwani <mlachwani@mvista.com>, linux-mips@linux-mips.org
In-reply-to: <yq0zn2ks9em.fsf@jaguar.mkp.net>
Original-recipient: rfc822;linux-mips@linux-mips.org
References: <416DE31E.90509@mvista.com> <20041014191754.GB30516@linux-mips.org> <Pine.LNX.4.58L.0410142305380.25607@blysk.ds.pg.gda.pl> <416EFBAB.8050600@mvista.com> <Pine.LNX.4.58L.0410142327530.25607@blysk.ds.pg.gda.pl> <20041014225553.GA13597@linux-mips.org> <Pine.LNX.4.58L.0410150311370.25607@blysk.ds.pg.gda.pl> <yq0zn2ks9em.fsf@jaguar.mkp.net>
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On Mon, Oct 18, 2004 at 04:44:17AM -0400, Jes Sorensen wrote:

> Dual address cycles, ie. 64 bit addressing is fscked on the 1250 from
> what I remember. Correct way to work around this is to stick all
> physical memory outside the 32 bit space into ZONE_HIGHMEM - had a patch
> for 2.4, but I lost it ages ago ;-(

The Momentum Jaguar suffers from similar problems, so I've implemented
that for Linux 2.6 as CONFIG_LIMITED_DMA.

> One can just hope Broadcom will learn how to make chips some day ;-(

Well, they've just done their homework, also known as the 1450.  Pick
your red pen and give grades ;-)

  Ralf

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