[U-Boot] Nand boot on imx6q board is broken

[Jörg Krause]

Hi,

On Thu, 2019-01-31 at 07:22 -0800, Adam Ford wrote:
> On Wed, Jan 30, 2019 at 11:40 PM Shyam Saini <shyam at amarulasolutions.com> wrote:
> > Hi Everyone,
> > 
> > I'm trying to boot imx6q board from nand but it seems like mainline
> > u-boot nand boot support for imx6q board is broken.
> 
> I spent some time trying to make the imx6q_logic board boot from SPL
> from NAND, but I needed to patch a few things.   Some of them have yet
> to be approved, but if they work for you, maybe it will help get them
> approved.
> 
> There was a broken function pointer here that was fixed and applied
> the imx-master, but pending merge with master
> http://patchwork.ozlabs.org/patch/1019440/
> 
> Configure ECC from SPL here:
> http://patchwork.ozlabs.org/patch/1020160/
> 
> Remove hard-coded ECC parameters since the patch above can autoset them.
> http://patchwork.ozlabs.org/patch/1026638/
> 
> With those 3 patches and some minor changes to my individual board
> file and config file, I was able to boot 2019.01 via SPL from NAND.
> Since it was working for you before, I am guessing the board file
> stuff and config file stuff is probably already for you.
> 
> adam

I can confirm that applying these three patches fixes booting from NAND
on a custom i.MX6ULL board with Micron NAND flash.

Jörg

> > It is working till v2017.05 with this fix [1].
> > 
> > I'm using this as my stub:
> > https://github.com/openedev/u-boot-amarula/tree/icore-nand
> > 
> > 
> > 
> > When I git bisect between v2017.05 and v2017.07, found this commit
> > which is further breaking  the nand boot support:
> > ------
> > ommit bc1fe9006dfaacc5103b5c7057a62215844957b7
> > Author: Jagan Teki <jagan at amarulasolutions.com>
> > Date:   Sun May 7 02:43:05 2017 +0530
> > 
> >     icorem6: Make SPL to pick suitable fdt
> > 
> >     SPL FIT is able to pick the suitable fdt file for u-boot,
> >     so add that function through board_fit_config_name_match.
> > 
> >     Cc: Stefano Babic <sbabic at denx.de>
> >     Cc: Matteo Lisi <matteo.lisi at engicam.com>
> >     Cc: Michael Trimarchi <michael at amarulasolutions.com>
> >     Signed-off-by: Jagan Teki <jagan at amarulasolutions.com>
> > -----
> > And It is fixed with this [2].
> > 
> > In mainline u-boot we already  have fix [1] and [2] available but nand
> > boot is still broken. It seems like problem is some where else, fix
> > [1] and [2] are just making the bug appear less frequently.
> > 
> > logs:
> > [3] nand boot working
> > [4] Nand boot not working
> > 
> > Has anyone else faced or fixed the same issue on imx6 board.
> > Please let me know.
> > 
> > 
> > [1] https://paste.ubuntu.com/p/nKq7SNWDrn/
> > [2] https://paste.ubuntu.com/p/tXqbx5dVPJ/
> > [3] https://paste.ubuntu.com/p/DcBQ4gcSCM/
> > [4] https://paste.ubuntu.com/p/WVtrqfdVQT/
> > 
> > 
> > Thanks a lot,
> > Shyam
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