Re: imx6ull: NAND boot fails when block 0x00000000 is bad

Hi Michael, I am using version 2022.04

|Colibri iMX6ULL # nand erase.chip NAND erase.chip: device 0 whole chip Skipping bad block at 0x00000000 Skipping bad block at 0x1ff80000|

Thierry

Le 13/05/2022 à 20:00, Michael Nazzareno Trimarchi a écrit :

Hi Thierry

Il ven 13 mag 2022, 19:56 Fabio Estevam festevam@gmail.com ha scritto:

[Adding some more folks]

On Fri, May 13, 2022 at 2:41 PM Thierry Bultel
<thierry.bultel@linatsea.fr> wrote:
>
> Hi,
>
> I have a imx6ull module from Toradex, with NAND flash. U-boot
does not
> have SPL.
> I does not boot from NAND flash anymore, I was able to flash it
several
> times with tezi, as well as with
> nandbcb (that I discovered more recently).
>
> There are error messages complaining about some bad blocks,
including
> block 0x00000000.
>
> Toradex say that the module cannot be recovered, but this seems in
> contradiction with what we can read
> from the iMX6 reference manual, where the boot process description
> mentions that the ROM can attempt to
> seek for FCB several times.
>
> I attempted to use nandbcb to write the FCB at next block, ie
0x20000
> (attempting a lower value
> makes nandbcb complain that I am not writing to an aligned
location),
> with no better success.
>
> What is your mind about that ? Sounds that the answer could be in
> mis-configured fuses,
> else I consider that having block 0x00000000 causes a bricked
board, as
> a weakness for production,
> in other words, an unreliable product.

What U-Boot version are you using? Anyway block 0 is always guarantee by nand manufacturer, so having that bad look strange

Michael

>
> Best regards
> Thierry
>
>
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