NAND support for Armada 370

[ezequiel.garcia@free-electrons.com (Ezequiel Garcia)]

On Fri, Jan 03, 2014 at 12:29:27PM +0100, Rodolfo Giometti wrote:
> On Thu, Jan 02, 2014 at 02:42:36PM +0100, Thomas Petazzoni wrote:
> > 
> > The 3.13-rc kernels do not have NAND support for Armada 370/XP. The
> > NAND support will only arrive in 3.14. You can try the linux-next tree,
> > but I'm not sure it has absolutely all of the patches that are needed
> > (I see at least one potentially missing).
> > 
> > Alternatively, you can use the backport-3.10 branch at
> > https://github.com/MISL-EBU-System-SW/mainline-public/commits/backport-3.10.
> > It is based on 3.10, and has a good number of backported patches,
> > including NAND support.
> 
> I got several patches from here:
> 
>    https://github.com/MISL-EBU-System-SW/mainline-public.git
> 
> and now I have:
> 
>    pxa3xx-nand f10d0000.nand: This platform can't do DMA on this device
>    NAND device: Manufacturer ID: 0x2c, Chip ID: 0xf1 (Micron MT29F1G08ABADAWP)
>    NAND device: 128MiB, SLC, page size: 2048, OOB size: 64

Great! Your NAND is now detected...

>    pxa3xx-nand f10d0000.nand: ECC strength 4 at page size 2048 is not supported
>    pxa3xx-nand f10d0000.nand: failed to scan nand at cs 0
> 
> So I suppose I should modify function pxa_ecc_init() in file
> drivers/mtd/nand/pxa3xx_nand.c in order to support my NAND chip, is
> that right? Have you any advice for me about it? :)
> 

Can you modify the above message so the ECC step size is also printed?
I'll help you prepare a suitable fix to support your NAND.

Thanks!
-- 
Ezequiel Garc?a, Free Electrons
Embedded Linux, Kernel and Android Engineering
http://free-electrons.com