linux-kernel - Re: [PATCH 6/13] devres: implement managed iomap interface

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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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