Re: [Yaffs] How to dump/flash a YAFFS2 image?

On Tue, 28 Sep 2010 07:40:22 -0500
"McCash John-GKJN37" <john.mccash@motorola.com> wrote:

> Bounlith,
>

>             I worked through this several months ago. Cat won't get
> everything you need from the mtd device, as YAFFS2 uses the
> out-of-bounds area. You will need to use the nanddump utility.

>

>                         John

>

Hi John,

Thanks for you answer. After your email, I found dump_image-arm-uclibc on the net and tried. But I got no better results. Then, I found your discussion about your work and your similar problem in the archive of this mailing list.

My work is exactly the same as yours: to dump the mtd blocks of an Android device and to mount the images of the dump on a Linux computer. Have you finally succeed? Have you rebuilt nanddump for Android ARM? Your discussion ended with the comparison of the YAFFS options in the kernels of Android and Linux.

I have downloaded the source files of mtd-utils and the mtd driver from here:
http://www.linux-mtd.infradead.org/
I will try to build this for Android. I hope this will work.

Bye.

>
>
> From: yaffs-bounces@lists.aleph1.co.uk
> [mailto:yaffs-bounces@lists.aleph1.co.uk] On Behalf Of Sirivong Bounlith
> Sent: Tuesday, September 28, 2010 4:48 AM
> To: yaffs@lists.aleph1.co.uk
> Subject: [Yaffs] How to dump/flash a YAFFS2 image?
>
>
>
> Hello,
>
> I need to dump a NAND device (formatted to YAFFS2) in an image, then
> write this image to the NAND emulated device on a linux computer.
>

> To get image, I have done a cat of the device:
>     cat /dev/mtd/mtd3 > <path>/yaffs2image.img

>

> I get a 150 MB file. To write the image to the NAND emulated device, I
> do this:
>     modprobe mtdblock 
>     modprobe mtdchar 
>     modprobe nandsim first_id_byte=0x20 second_id_byte=0x71
>     mount -t yaffs /dev/mtdblock0 /media/nand
>     cat yaffs2image.img > /dev/mtdblock0

>
> In result, /media/nand contents only a "lost + found" dir. But making a
> cat on mtdblock0 ouputs something which seems to be the contents of
> yaffs2image.img. I thought I retrieve the files of the original YAFFS2
> device, including all its clusters.
>
> Is there a way to get a dump of a YAFFS2 device, and to flash the dump
> to another device (emulated or not)?
>
> Thanks.
>
>
>
>
> --
> Bounlith Sirivong.