[PATCH v6 0/7] nand prefetch-irq support and ecc layout chanage

[Ghorai, Sukumar]

> -----Original Message-----
> From: Charles Manning [mailto:manningc2 at actrix.gen.nz]
> Sent: Monday, December 20, 2010 3:16 AM
> To: linux-mtd at lists.infradead.org
> Cc: Ghorai, Sukumar; linux-omap at vger.kernel.org; linux-arm-
> kernel at lists.infradead.org
> Subject: Re: [PATCH v6 0/7] nand prefetch-irq support and ecc layout
> chanage
> 
> On Saturday 27 November 2010 04:34:30 Sukumar Ghorai wrote:
> > The following set of patches applies on linux-2.6.
> >
> > The main motivations behind this patch series are -
> >         1. support NAND I/O in irq mode.
> >         2. support of different ECC schema.
> >         3. also to make ecc layout as like in romcode ecc layout
> 
> Why change the ECC layout?
> 
> Be very careful when you change ECC layouts. This can break production
> systems.
> 
> For example if people are running something earlier and then want to
> deliver a
> new kernel with 2.6.37 then their existing NAND file systems will no
> longer
> be readable.
> 
> Changes to ECC should only be done for very good reasons and should be
> controlled with a Kconfig with the default being the existing ECC layout.
> 
[Ghorai] we are just adding few ecc-layout(s) and based on the request from different customer. The default ecc-layout is the old one for backward compatibility and selection of ecc-layput is exposed form board file.