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Diffstat (limited to 'c/src/lib/libbsp/powerpc/shared/bootloader/README')
| -rw-r--r-- | c/src/lib/libbsp/powerpc/shared/bootloader/README | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/c/src/lib/libbsp/powerpc/shared/bootloader/README b/c/src/lib/libbsp/powerpc/shared/bootloader/README new file mode 100644 index 0000000000..6d36a152ba --- /dev/null +++ b/c/src/lib/libbsp/powerpc/shared/bootloader/README @@ -0,0 +1,41 @@ +# +# $Id$ +# + +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) + + |