'ubi clone' from Live NAND.

[Gupta, Pekon]

> If 'rootfs.ubi' is the 'ubinize' image, then I can mount and see the
> file system on my PC.  However, if the 'rootfs.ubi' is a 'dump' of the
> NAND flash, I fail with the following 'dmesg',

[pekon] 
I have tried this, using following steps, and it works well

(1) nanddump   -b -s 0x0  -l <size_of_source_partition>  -f  <image_dump.bin>  <source_partition>
(2) flash_erase   <target_partition>  0 0 
(3) nandwrite -n -r   <target_partition>         <image_dump.bin>  

where,
source_partition= partition on source device from which NAND binary would be dumped. (/dev/mtdX)
target_partition= partition on another device which NAND dumped image would be flashed (/dev/mtdY)


You need to keep few things in mind..
(1) sizeof(target_partion) > sizeof(source_partition), So as to take care of bad-blocks present on target device.

(2) '-n' option in nandwrite tells NAND driver not to calculate ECC while programming nand, as its is already part of 'raw' binary image

(3) You need to  'nanddump' complete source_partition (and not just image-size), because of following reasons
     (a) Image data may be shifted to other offsets due to presence of bad-blocks
     (b) If you are using 'autoresize' option, then UBIFS Volume may expand itself to cover entire free space first mount.
[Refer http://www.linux-mtd.infradead.org/doc/ubi.html#L_autoresize]


with regards, pekon