[U-Boot] Chain loading an u-boot from an u-boot

[Simon Glass]

Hi Hemut,

On 31 March 2014 05:29, Helmut Raiger <helmut.raiger at hale.at> wrote:

> On 02/13/2014 10:03 AM, Helmut Raiger wrote:
>
>>
>>
>> But you just inspired me! There are probably interrupts running
>> for some time when the second u-boot starts and the relocation
>> might destroy part of the interrupt entry points ....
>>
>> Thx for asking the right questions.
>> I'll have to check this.
>>
>> Helmut
>>
>
> I'm finally able to start the second u-boot (other things in-between as
> always).
> If I do a cleanup_before_linux(), i.e. turn off interrupts and caches
> before
> the actual 'go' and it works just fine.
>
> For testing I patched the go command, but obviously this can't be
> contributed as such.
>
> Anyone having a suggestion on how to do this?
>
> 1) add option to 'go' command, which is hard as it has variable arguments
> 2) add another go command
> 3) use an environment variable to set the option for 'go'
>
> Theoretically I could use a u-boot image to encapsulate the second u-boot
> and use 'bootm', but I think I'll stumble over the same kind of questions.


There is already 'dcache off' but I wonder if something like 'go prepare'
would be useful? Another option is that bootm has a prepare state, but it
requires an image.

Regards,
Simon

>
> --
> Scanned by MailScanner.
>
> _______________________________________________
> U-Boot mailing list
> U-Boot at lists.denx.de
> http://lists.denx.de/mailman/listinfo/u-boot
>