Tegra 2 T20 NAND Flash Support

[dev@lynxeye.de (Lucas Stach)]

Hi Marcel,

Am Mittwoch, den 04.06.2014, 03:00 +0200 schrieb Marcel Ziswiler:
> Sorry for referring to an old post of yours:
> 
>  > From: Thierry Reding <thierry.reding@...>
>  > Subject: Re: [PATCH V5 7/9] ARM: dts: tegra: add non-removable and 
> keep-power-in-suspend property for MMC
>  > Date: 2013-04-03 05:45:49 GMT (1 year, 8 weeks, 5 days, 12 hours and 
> 59 minutes ago)
>  > ...
>  > For Tegra20 Tamonten we don't use eMMC. Ideally we'd be using NAND to
>  > boot from but that doesn't have mainline support. I have a semi-working
>  > patch and will probably spend some more time getting it ready. The MMC
>  > cards are all removable, though I guess since they are the boot device
>  > they still should remain powered in suspend?
> 
> You might have noticed our current effort in further mainlining 
> Apalis/Colibri T30 module support. In the same respect we are looking at 
> further improving Colibri T20 support. One of the major missing pieces 
> is of course the NAND support you were mentioning in that 14 months old 
> post. Have you by any chance made any progress on this? As me (on PXA) 
> and Stefan (on Vybrid) do have quite some experience in the MTD NAND 
> infrastructure there might be a chance for some joint effort in that 
> respect. What do you think? Of course any other contribution/feedback is 
> also most welcome.

I took the Linux Tegra NAND driver from Thierry and cleaned it up quite
a bit. It now works with both ONFI and non-ONFI NAND, at least for
reading. Writing doesn't quite work yet and I've got side-tracked with
other stuff.

If you are interested in moving this forward I can put up my WIP patches
to some public location.

Regards,
Lucas