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

-----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:

quoted

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.