[OpenBIOS] Re: CHRP booting.

[Jd Lyons]

Thanks Mark,

I found a tool that says it can convert COFF to ELF format, but it says X86, so I’m not real sure it will work.

https://www.agner.org/optimize/#objconv

I did manage to build it on macOS 12.6 on my AppleSoC PowerBook, but trying to convert with this command seems to error out:

objconv -felf32 -nu /Users/jam/Downloads/objconv/BootX BootX.elf

Error 2018: Unknown type 0x5248433C for file: /Users/jam/Downloads/objconv/BootX

I would assume the COFF is COFF is COFF, but maybe this tool can’t convert for PPC COFF, if there is such a thing?
> On Sep 29, 2022, at 4:11 AM, Mark Cave-Ayland  wrote:
>
> On 28/09/2022 18:30, Jd Lyons via OpenBIOS wrote:
> > I’m trying to figure how Openbios boots CHRP boot scrips like :tbxi, yet SOLF does not.
> > Can anyone point me to the code in Openbios that enables :tbxi/CHRP booting?
> > Also, does anyone know how exactly that works, what was done to Openbios to enable booting the Mac OS?
> > I’d really like to try and get Apple’s BootX to load on Qemu’s pseries machines and as I understand it CHRP booting should work in SLOF, but it just errors out on BootX with "bad executable”, so there must be some magic I need to understand about :tbxi CHRP boot scripts that SLOF needs some sort of patch.
>
> The boot scripts are really just an XML file that contains among other things, a Forth command to use when booting the media. You can find the simple parser in OpenBIOS at https://github.com/openbios/openbios/blob/master/libopenbios/bootinfo_load.c.
>
> I suspect what is happening in SLOF is that the XML is being parsed, however the resulting executable loaded isn't being recognised because it is in COFF rather than ELF format.
>
> ATB,
>
> Mark.
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