NOR boot support for barebox on the mini2440

NOR boot support for barebox on the mini2440

[André Lochotzke]

Hello,

for a small student project I want to add support to barebox for booting
from the NOR flash on the mini2440. I hope that it will not be too
difficult since barebox can already boot from NOR on different boards.

Did somebody already do some work to enable NOR boot on the mini2440?

Do you have any suggestion of where I should start?

There is already an u-boot version since 2010 [1] that supports it. The
code can be found here [2].

Are the u-boot and barebox NOR subsystems very different? How much time
do you think would it take to get this done?

Regards
André

[1]
http://bliterness.blogspot.de/2010/04/new-nor-flash-support-in-u-boot.html
[2] http://repo.or.cz/w/u-boot-openmoko/mini2440.git


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Re: [oselas] NOR boot support for barebox on the mini2440

[Juergen Beisert]

Hi André,

André Lochotzke wrote:
> for a small student project I want to add support to barebox for booting
> from the NOR flash on the mini2440. I hope that it will not be too
> difficult since barebox can already boot from NOR on different boards.
>
> Did somebody already do some work to enable NOR boot on the mini2440?
>
> Do you have any suggestion of where I should start?
>
> There is already an u-boot version since 2010 [1] that supports it. The
> code can be found here [2].
>
> Are the u-boot and barebox NOR subsystems very different? How much time
> do you think would it take to get this done?

Should be more or less trivial. Setup the SDRAM controller, copy Barebox 
itself to the SDRAM and branch to it.

I didn't do that yet, because the NOR content is something like the "last 
resort" for a regular user to bring a bricked Mini2440 back to life.

Regards,
Juergen

-- 
Pengutronix e.K.                              | Juergen Beisert             |
Linux Solutions for Science and Industry      | http://www.pengutronix.de/  |

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Re: NOR boot support for barebox on the mini2440

[Sascha Hauer]

Hi André,

On Wed, Jun 06, 2012 at 02:00:02PM +0200, André Lochotzke wrote:
> Hello,
> 
> for a small student project I want to add support to barebox for booting
> from the NOR flash on the mini2440. I hope that it will not be too
> difficult since barebox can already boot from NOR on different boards.
> 
> Did somebody already do some work to enable NOR boot on the mini2440?
> 
> Do you have any suggestion of where I should start?
> 
> There is already an u-boot version since 2010 [1] that supports it. The
> code can be found here [2].
> 
> Are the u-boot and barebox NOR subsystems very different? How much time
> do you think would it take to get this done?

Starting barebox itself from NOR has nothing to do with the NOR
subsystem. I'm not familiar with the mini2440, so I can't tell what you
have to do to start barebox from NOR. However, adding a NOR device to
barebox (so that you can access NOR flash from within babreox) is
trivial, just add the following:

add_cfi_flash_device(-1, base_address, size, 0);

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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NOR boot support for barebox on the mini2440

[André Lochotzke]

Hello,

for a small student project I want to add support to barebox for booting
from the NOR flash on the mini2440. I hope that it will not be too
difficult since barebox can already boot from NOR on different boards.

Did somebody already do some work to enable NOR boot on the mini2440?

Do you have any suggestion of where I should start?

There is already an u-boot version since 2010 [1] that supports it. The
code can be found here [2].

Are the u-boot and barebox NOR subsystems very different? How much time
do you think would it take to get this done?

Regards
André

[1]
http://bliterness.blogspot.de/2010/04/new-nor-flash-support-in-u-boot.html
[2] http://repo.or.cz/w/u-boot-openmoko/mini2440.git


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