Re: bootloader for deeply embedded 405CR

[Wolfgang Denk <wd@denx.de>]

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In message <3AD370AA.93F59622@ixiacom.com> you wrote:
>
> > For the Walnut it should be a simple thing to do:
> >         make WALNUT405_config
> >         make
>
> I have built a CVS ppcboot as you suggest, however
> it appears to expect being burned into flash
> memory.

Right. That's what most of the people do.

> What I would like to do is GDB-load an ELF ppcboot
> into the Walnut's 32MB SDRAM mapped at address 0,
> then execute it in place. Then I want to GDB load a
> kernel at another higher address, and use ppcboot
> to boot it. Is this already possible or will I have
> to modify Makefiles, linker scripts, and possibly
> code?

You have to modify the link address at least; but most  probably  you
have  to  modify  other  code  as  well - for instance to prevent the
exception handlers to be installed, etc.

Why don't you do what everybody does, and write the image to flash?

Wolfgang Denk

--
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-4596-87  Fax: (+49)-8142-4596-88  Email: wd@denx.de
"Here's a fish hangs in the net like a poor man's right in  the  law.
'Twill hardly come out."     - Shakespeare, Pericles, Act II, Scene 1

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