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Message-ID: <47FB8948.9090302@gmail.com>
Date: Wed, 09 Apr 2008 00:03:36 +0900
From: Tejun Heo <htejun@...il.com>
To: Sergei Shtylyov <sshtylyov@...mvista.com>
CC: jgarzik@...ox.com, gregkh@...e.de, alan@...rguk.ukuu.org.uk,
linux-kernel@...r.kernel.org, linux-ide@...r.kernel.org,
linuxppc-dev@...abs.org
Subject: Re: [PATCH 6/13] devres: implement managed iomap interface
Sergei Shtylyov wrote:
>> Yeah, right please go ahead. But I wonder whether any BIOS was
>> actually crazy enough to map mmio region above 4G on 32bit machine.
>
> This is a *hardware* mapping on some non-x86 platforms (like PPC 44x
> or MIPS Alchemy). The arch/ppc/ and arch/mips/ kernels have special
> hooks called from ioremap() which help create an illusion that the PCI
> memory space on such platforms (not only it) is mapped below 4 GB;
> arch/powerpc/ kernel doesn't do this anymore -- hence this newly
> encountered issue.
Ah... I see. Thanks for the clarification.
--
tejun
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