Pulling flash image off device

[Andy Green]

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Somebody in the thread at some point said:
| This may seem trivial, but I can't seem to find anything on how to do
| this directly.
|
| Is there an easy way to pull my existing fs flash image OFF my phone
| so I can save the current config?  I want to have a backup so if I
| add a package or do an upgrade later that toasts my phone I don't
| have to start from square one again. ;)  I could probably remount the
| root as ro, and DD it out via ssh or to the mmc.  But is there
| anything I have to do otherwise to make it valid in dft-uilts eyes?

You'd think so... but no, raw NAND like we use is evil.  If you dd the
mtd block device directly, you will get any bad blocks inline with the
real filesystem data, without any OOB information to mark them as bad
and your image will be corrupted.

There are some nand_* utilities that can parse the OOB data as they go
through the block device and skip the bad blocks, you can try those.

There's also a dfu_util mode to read back the partiton over USB but it
is shaky in that read back mode.

- -Andy
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