From: Tejun Heo <htejun@gmail.com>
To: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Cc: linuxppc-dev@ozlabs.org, gregkh@suse.de,
linux-kernel@vger.kernel.org, linux-ide@vger.kernel.org,
jgarzik@pobox.com, alan@lxorguk.ukuu.org.uk
Subject: Re: [PATCH 6/13] devres: implement managed iomap interface
Date: Wed, 09 Apr 2008 00:03:36 +0900 [thread overview]
Message-ID: <47FB8948.9090302@gmail.com> (raw)
In-Reply-To: <47FB8751.3040301@ru.mvista.com>
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
next prev parent reply other threads:[~2008-04-08 15:03 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <11684073371547-git-send-email-htejun@gmail.com>
2008-04-07 16:46 ` [PATCH 6/13] devres: implement managed iomap interface Sergei Shtylyov
2008-04-08 14:48 ` Tejun Heo
2008-04-08 14:55 ` Sergei Shtylyov
2008-04-08 15:03 ` Tejun Heo [this message]
2008-04-10 16:56 ` Sergei Shtylyov
2008-04-10 17:44 ` Kumar Gala
2008-04-10 18:24 ` Sergei Shtylyov
2008-04-10 19:40 ` Kumar Gala
2008-04-11 2:08 ` Tejun Heo
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