On Wed, 29 Sep 2010 11:18:50 -0500
"McCash John-GKJN37" <john.mccash@motorola.com> wrote:

> Bounlith,
> 	You're on the right track. If you can get nanddump compiled with
> an appropriate toolchain, you should be able to dump the flash in such a
> way that you can load it back into an mtd device on your linux system. I
> wasn't able to get it to compile (I didn't really try), but found an
> internally compiled version, which unfortunately, I'm unable to share.
> 		John

Hi,

OK, I have succeeded in building nanddump for Android. I have tried it on the device. nanddump returns me the error: 

	Unknown flash (not normal NAND)

When looking at the source code of nanddump, I see that it checks the OOB size:

	/* Make sure device page sizes are valid */
	if (!(meminfo.oobsize == 128 && meminfo.writesize == 4096) &&
			!(meminfo.oobsize == 64 && meminfo.writesize == 2048) &&
			!(meminfo.oobsize == 32 && meminfo.writesize == 1024) &&
			!(meminfo.oobsize == 16 && meminfo.writesize == 512) &&
			!(meminfo.oobsize == 8 && meminfo.writesize == 256)) {
		fprintf(stderr, "Unknown flash (not normal NAND): meminfo.oobsize=%d\n",
				meminfo.oobsize);
		close(fd);
		exit(EXIT_FAILURE);
	}

What I get now is :
	Unknown flash (not normal NAND): meminfo.oobsize=56

which is an unsupported OOB size. Does it mean that the device uses a custom and non-standard NAND, or that I could omit this checking in the source code of nanddump? Not sure that nandwrite will accept the dump in that case.

Bounlith.

> 
> -----Original Message-----
> From: Bounlith Sirivong [mailto:bounlith.sirivong@atelier.tm] 
> Sent: Wednesday, September 29, 2010 11:16 AM
> To: McCash John-GKJN37
> Cc: yaffs@lists.aleph1.co.uk
> Subject: 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.
>