Subversion Repositories openrisc_me

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# $Id: README,v 1.2 2001-09-27 12:01:06 chris Exp $

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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!!) :

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)