source: rtems/c/src/lib/libbsp/powerpc/shared/bootloader/README @ df49c60

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The code in this directory has been taken WITH PERMISSION from 
Gabriel Paubert, paubert@iram.es. The main reason for having
a separate bootloader for PreP compliant firmware is that the 
initial code is relocated by firmware at an unknow address 
(actually  0x5000 on motorola MCP750) and that as Gabriel I 
think having a relocatable bootloder code is a must.

So the way of building a binary executable that can be booted via
hard disk or network boot goes like this :

        - make a RTEMS executable,
        - put is as data section in the bootloder binary,
        - relink the loader (see make-exe macros for details),

I would like to thank Gabriel for his support and his code.
The original code can be found in form of a patch to official linux 
kernel at (I insist not vger ppc kernel or Imac ppc kernels!!) :

<ftp://vlab1.iram.es/pub/linux-2.2/> 

After applying the patch, the code is located in a new directory 
called prepboot.

(NB : note use ftp not netscape...)

Note that the actual code differs a lot since Gabriel choose to use
a CHRP compliant mapping instead of a Prep Mapping to save
BATs. I had no time to upgrade the code to its new one allthough
I agree it should be done...

I have also splitted the original code to have a more modular
design enabling to reuse code between the loader and RTEMS
initialization (e.g printk, ...).

Eric Valette (valette@crf.canon.fr)