[U-Boot-Users] Flashes that live in more than one place...!

[U-Boot-Users] Flashes that live in more than one place...!

[Dave Peverley]

Hi all,

  This is my first post so hello for the first time :-)

  I'm porting (well, 90% done now) u-boot to a new board based on an OMAP
processor. This board happens to have a DIP switch to select whether
you boot from flash (strata) or ram. It does this by juggling CS0 and
CS3 for the flash. This means that at run time, if you're running from
ram you access the flash at 0x0C000000 or if running from flash, you
access it at 0x00000000. I can detect which state we're in no problem,
but I can't see a clean way to integrate this into the u-boot sources.

  The implication, is that at run time, I need to set new values for :
    PHYS_FLASH_1
    CFG_FLASH_BASE
    CFG_ENV_ADDR

This is _not_ a nice thing to do without creating a lot of changes in the
code :-/ I've dug about in the existing code (I'm working with the 1.0.0
codebase) to see if anyone else has done similar, but I haven't spotted any
suitable workarounds. Can anyone suggest a neat way to achieve this?

Best Wishes,

Dave Peverley

---------------------------------------------------------------------------
             Dave Peverley, Software Engineer, MPC Data Limited.
Phone : [+44] (0) 1225 868 228              Web : http://www.mpc-data.co.uk

[U-Boot-Users] Flashes that live in more than one place...!

[Wolfgang Denk]

In message <0e2d01c3ece1$baee9320$885c96c0@RIPSNORTERVM> you wrote:
> 
>   I'm porting (well, 90% done now) u-boot to a new board based on an OMAP
> processor. This board happens to have a DIP switch to select whether
> you boot from flash (strata) or ram. It does this by juggling CS0 and
> CS3 for the flash. This means that at run time, if you're running from

I understand this is just a debugging aid? Or how do  you  initialize
RAM and load an U-Boot image into it if you're booting from RAM?

> This is _not_ a nice thing to do without creating a lot of changes in the
> code :-/ I've dug about in the existing code (I'm working with the 1.0.0

Can you please explain first what you're trying to do?  And  why,  or
what for?

Best regards,

Wolfgang Denk

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[U-Boot-Users] Flashes that live in more than one place...!

[Dave Peverley]

Wolfgang Denk wrote:
> Can you please explain first what you're trying to do?  And  why,  or
> what for?
No big reason, just for convenience during development so as not to need
two built images when running in ram and using to self flash and image 
that runs from flash. Not vital, but I was wondering if there was a neat 
way to do it...
 
:-)

Best Wishes,

Dave Peverley


---------------------------------------------------------------------------
             Dave Peverley, Software Engineer, MPC Data Limited.
Phone : [+44] (0) 1225 868 228              Web : http://www.mpc-data.co.uk