[OpenBIOS] Re: CHRP booting.

[Jd Lyons]

Seems objcopy should be able to do this conversion from binutils, but perhaps I need to try objcopyppc as I’m not sure the input format is supported on arm64.
> On Sep 29, 2022, at 10:37 AM, Jd Lyons via OpenBIOS  wrote:
>
> 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 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 <[e-mail] > 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 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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