nand_imx 4k support ?

[Baruch Siach]

Hi Eric,

On Sun, Apr 01, 2012 at 02:45:18PM +0200, Eric Bénard wrote:
> Le Sun, 1 Apr 2012 13:49:35 +0300,
> Baruch Siach <baruch at tkos.co.il> a écrit :
> > On Sun, Apr 01, 2012 at 11:58:53AM +0200, Gabriel Tisan wrote:
> > > Has anybody started to implement support for flashes with 4k page size
> > > on nand_imx driver ?
> > 
> > 4k flashes should be supported in nand_imx since version v2011.05. See commit 
> > 4b4958dbb73e6fb553aaf91d539ff3e22bfe9e40 (mtd/nand_imx: add support for page 
> > size of 4k). I've tested it on i.MX25.
> > 
> newer flashs are using ONFI and thus some 4k flashes are not properly
> detected actually in barebox which may be the problem that Gabriel
> actually have.
> http://en.wikipedia.org/wiki/Open_NAND_Flash_Interface_Working_Group
> http://onfi.org/specifications/
> 
> I have the same requirement on an i.MX53 board (for the moment I
> hard coded the right values to bypass the flash detection which
> returned wrong results, the 4k falsh being detected as a 2k one) and
> plan to work on this during april but hard to say when so that may be
> beginiong of may.

Does the Linux kernel detect your flash correctly?

Write support for 4k flashes may require a patch similar to the kernel's 
2c1c5f19 (mtd: mxc_nand: fix OOB corruption when page size > 2KiB), i.e.  
extended ECC layout for OOB.

baruch

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