partitions and erase regions

[Nicolas Pitre]

On Fri, 30 Mar 2001, Kári Davíðsson wrote:

> Since there was no protest I just went ahead and commited the "virtual"
> erase region
> patch to mtdpart.

Sorry, I apparently missed your original post.

> > Hi,
> >
> > I am implementing a "virtual" erase regions for partitions.
> > It looks to me that should be enough to create them in
> > add_mtd_partition().
> >
> > This would make it easyer to manage partitions that cross erase region
> > boundaries.

Why do you want to have partitions that cross erase region in the first
place?

The primary goal of partitions is to easily _preserve_ some parts of the
flash while allowing free access to others.  If a writable, ence eraseable,
partition can start/end up in the middle of an erase region, you will
potentially trash part of a contigous partition that was ment to be
read-only.  Even if you preserve the erased content of the contigous
partition to write it back afterwards, you still have the risk of a power
failure at the right time that would rander your read-only partition
corrupted.


Nicolas



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