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To: "Maciej W. Rozycki" <>
Subject: Re: [PATCH]PCI on SWARM
From: Jes Sorensen <>
Date: 18 Oct 2004 04:44:17 -0400
Cc: Ralf Baechle <>, Manish Lachwani <>,
In-reply-to: <>
Original-recipient: rfc822;
References: <> <> <> <> <> <> <>
User-agent: Gnus/5.09 (Gnus v5.9.0) Emacs/21.3
>>>>> "Maciej" == Maciej W Rozycki <> writes:

Maciej> On Fri, 15 Oct 2004, Ralf Baechle wrote:
>> Sure, go ahead.  This btw should match with the pci_controller
>> definition which is looking fishy also.

Maciej>  Tough.  Both the PCI memory and the PCI I/O spaces are mapped
Maciej> in several areas, depending on the byte lane swapping policy
Maciej> needed and whether 64-bit addressing is feasible or not.  We'd
Maciej> need two areas for I/O and four for memory (plus another one
Maciej> for the 40-bit HT address space).

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 ;-(

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


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