linux-kernel - Re: Reading a physical memory location

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Message-ID: <1a297b360707110111u25a786c5m4857673e3e1b90a1@mail.gmail.com>
Date:	Wed, 11 Jul 2007 12:11:38 +0400
From:	"Manu Abraham" <abraham.manu@...il.com>
To:	"Nobin Mathew" <nobin.mathew@...il.com>
Cc:	"vraghavan3@...l.gatech.edu" <vraghavan3@...l.gatech.edu>,
	linux-kernel@...r.kernel.org
Subject: Re: Reading a physical memory location

On 7/11/07, Nobin Mathew <nobin.mathew@...il.com> wrote:
> Which is your platform ?
>
> Which processor?
>
> If you want to use physical address directly, then disable MMU. That
> is not possible in linux.

ioremap does map io memory using phys_to_virt
I thought phys_to_virt was enough to remap physical memory to virtual
http://mirror.linux.org.au/linux.conf.au/2005/cdrom-beta-1/linux-mandocs-2.6.12.6/phys_to_virt.html



>
> Nobin
>
> On 7/11/07, Manu Abraham <abraham.manu@...il.com> wrote:
> > On 7/10/07, vraghavan3@...l.gatech.edu <vraghavan3@...l.gatech.edu> wrote:
> > >
> > > Thanks for the quick reply. But I was wondering as to why I would have to map
> > > the physical address to the virtual address when I know that the string is
> > > permanently in the physical memory because its loaded into flash. Is there a way
> > > to directly read from the physical memory location? Also, do the functions
> > > ioremap() and readl(va) work when called from within a kernel module?
> > >
> >
> > Of course, if you look at almost any of the memory mapped device
> > drivers, you will find that ioremap/readl/writel is the backbone of
> > your infrastructure.
> >
> >
> > Manu
> >
>
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