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 -----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" 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 > /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.