[U-Boot] mpc83xx U-boot questions

[David Hawkins <dwh@ovro.caltech.edu>]

Hi Yuke,

> To be specific, I followed the steps to build RTEMS:
> 1) Download a set of toolsets (gcc-4.2.3, binutils-2.18, newlib-1.16 and
> RTEMS specific patches) and build them or use the pre-built rpm toolset
> for RHLE5.
> 2) Download the RTEMS (4.9.0 for the latest version) and use the toolset
> to build RTEMS.
> 3) Compile a RTEMS application,  tailed for specific BSP.  That is where
> I get .exe (it is ELF 32-bit MSB executable, PowerPC or cisco 4500,
> version 1 (SYSV), statically linked, not stripped).  I just want to use
> the vendor provided U-Boot to download the .exe and get it run. I didn't
> expect to rebuilt U-Boot, but that might be educational :-)          

Great, that is useful background information in which
to pose your questions.

It sounds like the Makefile puts a .exe extension on
the ELF file, and that can safely be ignored.

Does the RTEMs BSP for the MPC8313 board have a README
that tells you how to boot RTEMs? The ELF file is
not what will be executed by U-Boot. powerpc-linux-objcopy
would most likely be used to convert the ELF into a binary
image.  mkimage might be run on that image to add a header.
However, I've only used U-Boot with standalone apps and
Linux, so someone else would have to comment.
(VxWorks/RTEMs users - any help here?)

It does however sound like you have a reasonable tools
setup, and the step you are looking for is

  'what is necessary to convert the ELF file to a U-Boot
   compatible format, and then what U-Boot command is needed
   to execute it?'

Hopefully someone can help answer that. Please go and re-review
the U-Boot README file too, there's a chance that there are
some useful comments in there - now that you know what you
are looking for.

If someone on the RTEMs list answers your question, please
post the results back to this list so that the solution
is available in the archive.

Cheers,
Dave