[U-Boot-Users] can i load u-boot into RAM and jump to it as a test?

[Frank]

The main things to #ifdef  out are:
- The ram init code.
- The serial init code
- the bat init code
- the cache in ram trick and point the stack to an unused area
of memory.
- The relocate_code function since you are already in ram.
- make sure you change the TEXT_BASE variable to point to the
area in ram you want to run.

I've done this (ran u-boot from ram) on many different boards
and it's not that diifcult if you know what you're doing.:-)
BTW, bedbug comes in handy since the symbol addresses map
directly to the link addresses...

--- "Robert P. J. Day" <rpjday at mindspring.com> wrote:

> 
>    (i posted something similar to this on the SF forum before
> i 
> realized there was a real mailing list.  oops.)
> 
>    before i commit myself to reflashing with u-boot, i'd like
> to know 
> if it's possible to just load it into RAM and use the current 
> bootloader to jump to it, just to see the menu come up,
> nothing more.
> 
>    working with an 8xx board, 850DE-based, and as a test, i
> did a 
> configure with RPXlite_config (even though, technically, it's
> not 
> exactly an RPXlite but close).  generated u-boot.bin and used
> embedded 
> planet's planet core (PC) bootloader to download it into RAM. 
> at this 
> point, am i allowed to just use PC to
> 
> > g <download address>   ??
> 
>    we could do that with PC -- compile a new version, download
> it to 
> RAM and jump to it, just to see that it seemed to function at
> the 
> basic level.
> 
>    thoughts?  i've tried it, and every time i use PC to
> transfer 
> control, i get nothing -- immediate hang.  maybe a serial
> comms 
> problem?  who knows?
> 
> rday
> 
> 
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