linux-kernel - Re: Reading a physical memory location

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Message-ID: <8d6898730707110157g7ddd7a27of0e0a02fe1afbdc4@mail.gmail.com>
Date:	Wed, 11 Jul 2007 14:27:05 +0530
From:	"Nobin Mathew" <nobin.mathew@...il.com>
To:	"Manu Abraham" <abraham.manu@...il.com>
Cc:	"vraghavan3@...l.gatech.edu" <vraghavan3@...l.gatech.edu>,
	linux-kernel@...r.kernel.org
Subject: Re: Reading a physical memory location

Thanks

On 7/11/07, Manu Abraham <abraham.manu@...il.com> wrote:
> On 7/11/07, Nobin Mathew <nobin.mathew@...il.com> wrote:
> > See this in the documentation
> >
> > The returned virtual address is a current CPU mapping for the memory
> > address given. It is only valid to use this function on addresses that
> > have a kernel mapping
> >
> > This function does not handle bus mappings for DMA transfers. In
> > almost all conceivable cases a device driver should not be using this
> > function
> >
>
> To get a better idea, look here
> http://tldp.org/LDP/khg/HyperNews/get/devices/addrxlate.html
>
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