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# $Id: README,v 1.2 2001-09-27 12:01:06 chris Exp $
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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
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The code in this directory has been taken WITH PERMISSION from
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Gabriel Paubert, paubert@iram.es. The main reason for having
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Gabriel Paubert, paubert@iram.es. The main reason for having
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a separate bootloader for PreP compliant firmware is that the
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a separate bootloader for PreP compliant firmware is that the
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initial code is relocated by firmware at an unknow address
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initial code is relocated by firmware at an unknow address
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(actually 0x5000 on motorola MCP750) and that as Gabriel I
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(actually 0x5000 on motorola MCP750) and that as Gabriel I
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think having a relocatable bootloder code is a must.
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think having a relocatable bootloder code is a must.
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So the way of building a binary executable that can be booted via
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So the way of building a binary executable that can be booted via
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hard disk or network boot goes like this :
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hard disk or network boot goes like this :
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- make a RTEMS executable,
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- make a RTEMS executable,
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- put is as data section in the bootloder binary,
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- put is as data section in the bootloder binary,
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- relink the loader (see make-exe macros for details),
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- relink the loader (see make-exe macros for details),
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I would like to thank Gabriel for his support and his code.
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I would like to thank Gabriel for his support and his code.
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The original code can be found in form of a patch to official linux
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The original code can be found in form of a patch to official linux
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kernel at (I insist not vger ppc kernel or Imac ppc kernels!!) :
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kernel at (I insist not vger ppc kernel or Imac ppc kernels!!) :
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After applying the patch, the code is located in a new directory
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After applying the patch, the code is located in a new directory
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called prepboot.
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called prepboot.
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(NB : note use ftp not netscape...)
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(NB : note use ftp not netscape...)
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Note that the actual code differs a lot since Gabriel choose to use
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Note that the actual code differs a lot since Gabriel choose to use
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a CHRP compliant mapping instead of a Prep Mapping to save
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a CHRP compliant mapping instead of a Prep Mapping to save
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BATs. I had no time to upgrade the code to its new one allthough
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BATs. I had no time to upgrade the code to its new one allthough
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I agree it should be done...
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I agree it should be done...
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I have also splitted the original code to have a more modular
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I have also splitted the original code to have a more modular
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design enabling to reuse code between the loader and RTEMS
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design enabling to reuse code between the loader and RTEMS
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initialization (e.g printk, ...).
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initialization (e.g printk, ...).
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Eric Valette (valette@crf.canon.fr)
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Eric Valette (valette@crf.canon.fr)
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