linux-kernel - Re: Reading a physical memory location

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Message-ID: <8d6898730707091539y14cf5afbsed7ed769526da0a1@mail.gmail.com>
Date:	Tue, 10 Jul 2007 04:09:40 +0530
From:	"Nobin Mathew" <nobin.mathew@...il.com>
To:	"vraghavan3@...l.gatech.edu" <vraghavan3@...l.gatech.edu>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Reading a physical memory location

Hi,
        If you know the physical address, then you get virtual address
from that physical adress by using ioremap().

Then you can use readl(virtualaddress) to read the string from there

Nobin Mathew

On 7/10/07, vraghavan3@...l.gatech.edu <vraghavan3@...l.gatech.edu> wrote:
>
>
> --
> Hey all,
>
> I know the physical address of a string which is loaded into flash memory. I
> want to read the string at the known physical memory location from within a
> kernel module. I initially tried reading the "/dev/mem" file using open(),
> lseek() and read(). But I guess its not possible to call these functions from a
> kernel module.
>
> Is there some way of reading the contents of this physical memory location from
> within a kernel module?
>
> Thank You
> Veena
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