From mboxrd@z Thu Jan  1 00:00:00 1970
Received: from mail.bittware.com ([208.82.132.157]
	helo=olympus.corp.bittware.com)
	by bombadil.infradead.org with esmtp (Exim 4.69 #1 (Red Hat Linux))
	id 1Mqo0n-0003Yx-Nc
	for linux-mtd@lists.infradead.org; Thu, 24 Sep 2009 13:05:34 +0000
Subject: Re: Mounting Entire Flash
From: Dennis McLeod <dmcleod@bittware.com>
To: Rahanesh <rahanesh@tataelxsi.co.in>
In-Reply-To: <4ABB468D.9050009@tataelxsi.co.in>
References: <4ABB468D.9050009@tataelxsi.co.in>
Date: Thu, 24 Sep 2009 09:05:15 -0400
Message-Id: <1253797515.3722.3.camel@lusitania>
Mime-Version: 1.0
Content-Transfer-Encoding: 7bit
Content-Type: text/plain
Cc: linux-mtd@lists.infradead.org
List-Id: Linux MTD discussion mailing list <linux-mtd.lists.infradead.org>
List-Unsubscribe: <http://lists.infradead.org/mailman/options/linux-mtd>,
	<mailto:linux-mtd-request@lists.infradead.org?subject=unsubscribe>
List-Archive: <http://lists.infradead.org/pipermail/linux-mtd/>
List-Post: <mailto:linux-mtd@lists.infradead.org>
List-Help: <mailto:linux-mtd-request@lists.infradead.org?subject=help>
List-Subscribe: <http://lists.infradead.org/mailman/listinfo/linux-mtd>,
	<mailto:linux-mtd-request@lists.infradead.org?subject=subscribe>



On Thu, 2009-09-24 at 15:44 +0530, Rahanesh wrote:
> Hi All,
> 
> Currently I have 4 mtd partitions in Flash. They are all seen under /dev 
> directory as mtd0 mtd1 mtd2 and mtd3.
> 
> mtd0-> Uboot + Itz Environment
> mtd1-> JFFS
> mtd2-> Config files
> mtd3-> Not used
> 
> I am currently trying to implement Image upgradation.
> 
> I will need to update JFFS, uboot and Config files from Linux.
> 
> I am currently achieving this through  flash_eraseall and dd  command .
> 
> To Update U-boot First i will do a
> 
> flash_eraseall /dev/mtd0 and then
> dd if=uboot.bin of=/dev/mtd0 count=size;
> 
> and similarly for all individual partitions.
> 
> But If i have a combined image as combined.bin  how do i update the 
> entire flash .
> 
> Is it possible to see entire flash as /dev/mtd  . i can very well 
> extract individual images from combined image and reflash to respective 
> partitions.
> 
> But it would be generic if  we are able write to entire flash not to 
> individual partitions.
> 
> Is it possible to Write to entire flash as such.
> 
> Thanks
> Rahanesh

I always set up a partition that spans the entire flash chip.. 

mtd0 -> 0:ENTIRE_SIZE
mtd1 -> 0:+10M
mtd2 -> 10M:22M
...



-  
=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=
= Dennis McLeod                   =
= Software Engineer               =
= BittWare, Inc.                  =
= 603.226.0404 ext 514            =
=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=
** BittWare Celebrates 20 Years Delivering COTS Signal Processing Solutions 1989 - 2009 **