On 09/02/2010 09:54 AM, Kevin Cernekee wrote:

On Wed, Sep 1, 2010 at 2:23 PM, Ryan Mallon [off-list ref] wrote:

quoted

However, we are interested in having a proper solution to this problem.

I would suggest using this patch as a starting point - could you
please review the changes and try it out?

http://git.infradead.org/users/dedekind/l2-mtd-2.6.git/commitdiff/b6d6ae730be2750fac166ed9df11ee6ea54d9160

That patch still breaks the ABI by renaming struct nand_ecclayout to
nand_ecclayout_user. Any application using the old names will have to be
rewritten to compile against a new kernel.

The old interface should remain unchanged in that include/mtd/mtd-abi.h.
If an application using the old interface calls any of the ecc ioctls
for a nand chip with > 64 bytes ecc it should return an error.

I still think the eccpos field should be a pointer, so that it can
allocate as much space as is needed for the ecc. This also means that
the kernel doesn't need to be changed every time a new NAND chips
appears with a bigger ecc size.

~Ryan

-- 
Bluewater Systems Ltd - ARM Technology Solution Centre

Ryan Mallon         		5 Amuri Park, 404 Barbadoes St
ryan at bluewatersys.com         	PO Box 13 889, Christchurch 8013
http://www.bluewatersys.com	New Zealand
Phone: +64 3 3779127		Freecall: Australia 1800 148 751
Fax:   +64 3 3779135			  USA 1800 261 2934