UBI: adds block device layer on top of UBI

[Nancy]

> Sorry, which task are you going to solve? And what do you do to solve
> it?
The mail titiled "UBI: adds block device layer on top of UBI" was
delayed by the mail server 24 hours, I already solve the problem by
myself.

The mail titled " [PATCH] [MTD] [UBI] add block device layer on top of
UBI " is the task I'm goting to solve.   Please help!

Many thanks

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Best wishes,
Nancy