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

[Adam Ford <aford173@gmail.com>]

On Wed, Jan 30, 2019 at 11:40 PM Shyam Saini <shyam@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
>
> 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@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@denx.de>
>     Cc: Matteo Lisi <matteo.lisi@engicam.com>
>     Cc: Michael Trimarchi <michael@amarulasolutions.com>
>     Signed-off-by: Jagan Teki <jagan@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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