[PATCH] nandwrite: add --nobad to write bad blocks

[Artem Bityutskiy]

On Wed, 2010-09-29 at 13:35 +1000, Iwo Mergler wrote:
> The upshot of this is that blocks are marked as bad by the
> manufacturer based on corner case testing. Like erasing at
> high temperature / low voltage and reading back at low
> temperature / high voltage. The manufacturer can also
> access pads on the naked die that are not connected to pins
> during packaging.

Is only about letting you write to bad eraseblocks, not about erasing
them. I assumed this cannot be used for marking bad eraseblocks as good
back. The kernel does not have any protection against writing to bad
eraseblocks, so I do not see why Mike cannot have this option.

But speaking about erasing bad eraseblocks, which we also discussed, I
think you have a good point - we should probably distinguish between
factory-marked bad eraseblocks and user-marked. AFAIR, the OOB marker
for them was even different, or in BBT, do not really remember.

We probably can allow erasing user-marked bad eraseblocks and unmarking
them. But we probably should not allow erasing factory-marked bad
eraseblocks. But again, I'm not sure if it is possible to do, did not
really think about this.

But I think this particular patch from Mike is OK.

-- 
Best Regards,
Artem Bityutskiy (Артём Битюцкий)