i.MX6Q Boot from NAND

i.MX6Q Boot from NAND

[andreas.willig]

Hi,

has anyone in the community successfully managed to get Barebox running out of NAND on i.MX6Q/DL? I cannot find any support for BCB / FCB in the BB sources and am hitting problems while migrating from i.mx28 (MXS?) sources of BCB. U-Boot seems to run from NAND on i.MX6Q but is not an option for our project.



Mit freundlichen Grüßen aus Berg/ With kind regards

i.A. Andreas Willig
Dipl.-Ing. (FH)
Entwicklung Elektronik

RAFI GmbH & Co. KG
Postfach 2060
88276 Ravensburg
Tel.: +49 (0) 751 89-6142

mailto:andreas.willig@rafi.de, http://www.rafi.de

Kommanditgesellschaft: Sitz Berg, Amtsgericht Ulm, HRA 550059
Komplementär: RAFI Beteiligungs-GmbH, Sitz Berg, Amtsgericht Ulm HRB 550074
Geschäftsführer: Albert Wasmeier, Dipl.-Kfm. Gerhard Schenk
USt-Ident.-Nr.: DE 146 392 319, Steuer-Nr.: 77079/00291
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Re: i.MX6Q Boot from NAND

[Sascha Hauer]

Hi ANdreas,

On Wed, Feb 26, 2014 at 07:30:59AM +0100, andreas.willig@rafi.de wrote:
> Hi,
> 
> has anyone in the community successfully managed to get Barebox
> running out of NAND on i.MX6Q/DL? I cannot find any support for BCB /
> FCB in the BB sources and am hitting problems while migrating from
> i.mx28 (MXS?) sources of BCB. U-Boot seems to run from NAND on i.MX6Q
> but is not an option for our project.

So far I used kobs-ng for doing this, I didn't have luck with migrating
the i.MX28 BCB code so far. Somebody asked the same question a while
ago, but I can't remember who it was. He didn't report success so far
either.

Sascha

-- 
Pengutronix e.K.                           |                             |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |

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Re: Antwort: Re: i.MX6Q Boot from NAND

[Sascha Hauer]

On Wed, Feb 26, 2014 at 08:15:00AM +0100, andreas.willig@rafi.de wrote:
>    Hi Sascha
>    i saw this Thread too in the archives, but since no code was entered into
>    repo i suppose the effort was not successful. By my opinion it should be
>    solvable, since U-Boot get's it running and sources are not that different
>    concerning this point. I did compare the BCB section in U-Boot with BCB
>    sections in Barebox and for the first point of view, i did not find the
>    difference, I'm just about to debug this using Lauterbach.
> 
>    Btw is there a well known procedure to keep i.MX6Q cool? I got a passive
>    cooler, but especially during debugging system get's heat up over 80�C !!!
>    Which issues a reset using u-boot.

Philipp has recently sent a patch which turns off the GPU clocks in
barebox. This could help a little. The path sits in -next right now.

Sascha


-- 
Pengutronix e.K.                           |                             |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |

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Re: i.MX6Q Boot from NAND

[Sascha Hauer]

On Wed, Feb 26, 2014 at 03:49:37PM -0500, Michael D. Burkey wrote:
> >Hi ANdreas,
> 
> PS...
> Out of curiosity, which SOM are you using that boots from NAND?
> I'm currently working with Variscite's SOM -- and life would have been
> much simpler if someone had just put a SPI NOR on it!

+1

Booting from Nand is always a pain, not only on i.MX. SoC vendors are
always very creative when it comes to bad block handling and ECC layout.
Since it's the ROM code that reads the initial portion you are forced to
put on Nand whatever the ROM code wants to have, even if you want to use
a completely different ECC layout / Bad block table on your Nand.

Sascha

-- 
Pengutronix e.K.                           |                             |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |

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i.MX6Q Boot from NAND

[Michael D. Burkey]

>Hi ANdreas,
>
>On Wed, Feb 26, 2014 at 07:30:59AM +0100, andreas.willig at rafi.de wrote:
>> Hi,
>>
>> has anyone in the community successfully managed to get Barebox
>> running out of NAND on i.MX6Q/DL? I cannot find any support for BCB /
>> FCB in the BB sources and am hitting problems while migrating from
>> i.mx28 (MXS?) sources of BCB. U-Boot seems to run from NAND on i.MX6Q
>> but is not an option for our project.
>
>So far I used kobs-ng for doing this, I didn't have luck with migrating
>the i.MX28 BCB code so far. Somebody asked the same question a while
>ago, but I can't remember who it was. He didn't report success so far
>either.
>
>Sascha

Andreas,

The person Sascha remembers asking about this was probably me.

I've started working on porting the bcb generation code from kobs-ng
over to barebox but haven't gotten it working either (and haven't had
time to work on it in several weeks).

That said, barebox itself works and boots fine from NAND as long as
you use kobs-ng to put it there. The other partitions can be written
to without issue from barebox directly (i.e. kernel, environment,
root, etc).

What I do:
Boot all the way to Linux command line on the target, making sure that
my barebox-*.img file is available either on USB flash or SD.

Then from the Linux command line:

kobs-ng init barebox-(whatever).img --search_exponent=1

After this, barebox should boot up nicely from NAND.

Eventually, I may get back to finishing up porting the bcb code, but
it won't be in the near future due to other schedule constraints.

Michael Burkey

PS...
Out of curiosity, which SOM are you using that boots from NAND?
I'm currently working with Variscite's SOM -- and life would have been
much simpler if someone had just put a SPI NOR on it!

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