[OpenBIOS] PReP PowerPC "emulation"

[Andreas Färber]

Massimo,

Am 15.09.2010 um 20:06 schrieb Massimo Montecchi:

> can you suggest me where to find the code for "PReP"?
> AIX needs PReP emulation to works!!!!!

I was serious when I suggested you could *contribute* PReP support to  
OpenBIOS!

Currently only the g3beige and mac99 machines are somewhat supported.  
QEMU did not use OpenBIOS for ppc before, so the QEMU-specific ppc  
parts are still quite new and there will not be much code for PReP  
yet. Part of the problem was that the Linux kernel dropped support for  
PReP machines, so I am less certain whether PReP emulation is the only  
way to run AIX in QEMU. Maybe some new non-PReP machine with a  
hardware configuration different from Macs would do, too?

For PReP you will definitely need to patch QEMU's hw/ppc_prep.c code  
to properly load the openbios-ppc file (fixing the current error  
message), and OpenBIOS must probably react to the machine type in,  
e.g., arch/ppc/qemu/init.c and behave differently from New World Macs  
where necessary (cf. ARCH_PREP).

Ciao,
Andreas

P.S. Please avoid top-posting as it makes reading and answering more  
difficult. Thanks.

> 2010/9/13 Mark Cave-Ayland <mark.cave-ayland at siriusit.co.uk>
> Massimo Montecchi wrote:
>
> How can I use openbios to start an AIX with qemu ?
>
> Sadly I don't believe there is an OpenBIOS PPC maintainer at the  
> moment (which is a shame as recent versions of OpenBIOS are now able  
> to bootload a lot more kernels).
>
> We would be happy to accept any patches that you would like to  
> contribute though.
>
>
> ATB,
>
> Mark.
>
> -- 
> Mark Cave-Ayland - Senior Technical Architect
> PostgreSQL - PostGIS
> Sirius Corporation plc - control through freedom
> http://www.siriusit.co.uk
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>
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>
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> Cordiali Saluti/Best Regards
>
> Massimo Montecchi
> Modena - Italy
> -- 
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