[U-Boot-Users] Flashes that live in more than one place...!
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
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
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
participants (2)
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Wolfgang Denk