Some news for this: [PATCH] [MTD] BLOCK_RO: Readonly Block Device Layer Over MTD ?

[Josh Boyer]

On Wed, 21 Nov 2007 18:07:19 +0100
"Gregory CLEMENT" <gclement00 at gmail.com> wrote:

> 2007/11/21, Josh Boyer <jwboyer at linux.vnet.ibm.com>:
> > On Wed, 21 Nov 2007 17:28:05 +0100
> > "Gregory CLEMENT" <gclement00 at gmail.com> wrote:
> >
> > > 2007/11/21, Jörn Engel <joern at logfs.org>:
> > > > On Wed, 21 November 2007 15:27:19 +0100, Gregory CLEMENT wrote:
> > > > >
> > > > > I come back with my question because it seems that last time I sent
> > > > > this mail mtd mailing list was done during few weeks, so maybe  this
> > > > > mail was lost.
> > > >
> > > > What problem does the driver solve?
> > > It allow  to use cramfs/squashfs/fat in read-only on NAND flash for
> > > embedded systems.
> >
> > Not really.  It allows you to put one of those filesystems into
> > NAND using a bad-block aware program initially, and mount it.  It
> > doesn't handle run-time bit flips or errors from what I can see.
> >
> > josh
> >
> 
> Are these  run-time bit flips can happen on reading only mode?

They can, yes.  Particularly if you do lots of reads to the same NAND
page, which can happen for superblock type transactions.

josh