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Re: [PATCH]PCI on SWARM

To: Ralf Baechle <ralf@linux-mips.org>
Subject: Re: [PATCH]PCI on SWARM
From: Jes Sorensen <jes@wildopensource.com>
Date: 20 Oct 2004 01:56:02 -0400
Cc: "Maciej W. Rozycki" <macro@linux-mips.org>, Manish Lachwani <mlachwani@mvista.com>, linux-mips@linux-mips.org
In-reply-to: <20041018191507.GA14440@linux-mips.org>
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> <20041018191507.GA14440@linux-mips.org>
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>>>>> "Ralf" == Ralf Baechle <ralf@linux-mips.org> writes:

Ralf> 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 ;-(

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

Wouldn't it be better to always have the highmem zone configured and
then just fill it up with pages if you have a b0rked platform? The
cost of this is miniscule.

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

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

The moment I receive one in my mailbox ;-)

Cheers,
Jes

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