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To: Ralf Baechle <>
Subject: Re: [PATCH]PCI on SWARM
From: Jes Sorensen <>
Date: 20 Oct 2004 01:56:02 -0400
Cc: "Maciej W. Rozycki" <>, Manish Lachwani <>,
In-reply-to: <>
Original-recipient: rfc822;
References: <> <> <> <> <> <> <> <> <>
User-agent: Gnus/5.09 (Gnus v5.9.0) Emacs/21.3
>>>>> "Ralf" == Ralf Baechle <> 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 ;-)


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