flash image from SD card

[Wolfgang Spraul]

Werner,

> - if the u-boot we use at the factory is the same we ship the devices
>  with, we could just not replace it. So, do we really need a separate
>  version for use inside the factory ?

I'm definitely leaning towards that option.
If we have to have 2 u-boot versions, I want to REALLY understand why  
that is so.
Wolfgang

On Apr 1, 2008, at 12:27 AM, Werner Almesberger wrote:

> Willie Chen wrote:
>> Then uboot can read the env-5secs.env.
>
> Great ! Problem almost solved ;-)
>
>> Maybe the problem is if we flash u-boot image from linux, then we  
>> can't
>> read correctly environment.
>
> Aaah, now it clicked ! It's the environment pointer that gets  
> clobbered.
> It's "hidden" in the OOB area (in the u-boot partition), but
> flash_erase(all) erases that anyway.
>
> We don't see this effect with DFU, because u-boot explicitly restores
> the environment pointer after DFU'ing to the u-boot partition.
>
> I had a quick look at the underlying logic, and there's no easy way to
> tell flash_erase(all) to not erase the OOB data. So we have two  
> options:
>
> - I can write a special erase tool that preserves the OOB data
>
> - if the u-boot we use at the factory is the same we ship the devices
>  with, we could just not replace it. So, do we really need a separate
>  version for use inside the factory ?
>
> Thanks,
> - Werner
>