[U-Boot] Is it possible to boot the U-boot from the another U-boot from the flash area

[Ishwar Saunshi]

Thanks Wolfgang,

I have gone through the FAQ section, this FAQ only talks about the
condition where the other Uboot is in RAM but what I am thinking is to boot
the Uboot from the flash location by another running Uboot.

for example if my board flash starts from 0xC000_0000 to 0xCFFF_FFFF and
the first Uboot-1 is programmed @ 0xC800_0000 and second Uboot-2 is
programmed @0xC500_0000 on reset Uboot-1 starts from flash and load it self
to RAM and boots up and from there is it possible to boot Uboot-2 by using *
go* cmd or in any other way.


Regards,
ISHWAR


On Wed, Jun 27, 2012 at 7:19 PM, Wolfgang Denk <wd at denx.de> wrote:

> Dear Ishwar Saunshi,
>
> In message <
> CAKD3hySShg8+XNX1yQNVDDLYQupgaJC-Lmg1qZ32cy5eBm6GQw at mail.gmail.com> you
> wrote:
> >
> > I am really curiuos to see if U-boot can boot another version or another
> > Uboot burnt in flash ?
> > Its like having 2 images of U-boot which can boot each other if it is
> > possible can any one of you hint me how I can achive this. I tried to
> > relocate the Uboot and burned on to the flash in 2 different loacation
> > however when I try to do "go <U-boot effective address>" it ends up in
> TLB
> > error in early stage of flash execution.
>
> In general, this is not possible.  This topic is covered in the FAQ
> here:
>
> http://www.denx.de/wiki/view/DULG/CanUBootBeConfiguredSuchThatItCanBeStartedInRAM
>
>
> Best regards,
>
> Wolfgang Denk
>
> --
> DENX Software Engineering GmbH,     MD: Wolfgang Denk & Detlev Zundel
> HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
> Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
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> - vi
>