[OpenBIOS] [Qemu-devel] Re: QEMU OpenBIOS booting?
steven at uplinklabs.net
Sun Apr 19 19:56:47 CEST 2009
On Sun, Apr 19, 2009 at 10:47 AM, M. Warner Losh <imp at bsdimp.com> wrote:
> In message: <f488382f0904190128l4383a56eu67a2f16eb338e61c at mail.gmail.com>
> Steven Noonan <steven at uplinklabs.net> writes:
> : I eventually decided it made more
> : sense to get QEMU working instead. I did notice that the pre-OpenBIOS
> : version of QEMU was able to boot Mac OS X via Open Hack'Ware, so I was
> : annoyed to find that OpenBIOS didn't have such support. So, I might as
> : well add it.
> Open Hackware was barely enough to boot older versions of Linux.
> Other operating systems that needed more extensive properties from the
> OpenFirmware device tree failed to boot because they weren't present.
> I was involved in a large effort to get FreeBSD/powerpc booting on
> QEMU only to have it fail utterly because the amount of hacking on
> OpenHackWare needed was rather large and mysterious...
Yes, Open Hack'Ware is as much a hack as PearPC is, in my opinion. It
uses very strange design decisions, which I suppose were inspired by
an "I'll do this later" attitude. For instance, in the CHRP script
'parser' it has, it will do a CRC of the boot script and then do a
table lookup to figure out what to do next, i.e.:
/* MacOS 9.2 boot script:
* the XCOFF loader is embedded in the file...
/* iBook 2 restore CD (MacOS X 10.2) */
* The executable file is embedded after the script
Quite clearly, Open Hack'Ware was aptly named. It seems to have made
no effort to actually -execute- the CHRP boot-script, and instead just
do whatever would be necessary to get specific OSes working. Blech.
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