Re: [OpenBIOS] Starting QEMU with OpenBIOS for Sparc32

[Blue Swirl]

> Can someone just give me a quick overview of the "right way" to start up
> QEMU so that it will load the OpenBIOS firmware instead of PROLL, and how 
> to
> point QEMU to my Solaris installation CD image file.

Just rename openbios-builtin.elf.nostrip to proll.elf. I don't know if 
OpenBIOS can be compiled in Solaris, please report if you try.
> Do I need any hacks / patches to QEMU to use OpenBIOS instead of PROLL ?

The attached patch to CVS version of Qemu fixes several critical problems in 
Sparc emulation.
> What debugging switches should I enable with QEMU to help me figure out why
> things aren't working when trying to boot the SunOS 4.1.4 (Solaris 1.1.2)
> installation CD ?
>
> Is there a "best way" to build OpenBIOS to ensure maximum useful debugging
> information is produced ?

I don't think Qemu debugging switches are that helpful, but enabling 
CONFIG_DEBUG_OBP in OpenBIOS shows the OBP calls.
> If I'm repeating a whole lot of old questions, is there a FAQ for the QEMU
>
> OpenBIOS (Sparc32) combination that someone can point me to ?

Well, the combination didn't even exist a couple of months ago...

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Starting QEMU with OpenBIOS for Sparc32

[Stefan Reinauer]

* Blue Swirl  [060606 17:04]:
> > Can someone just give me a quick overview of the "right way" to start up
> > QEMU so that it will load the OpenBIOS firmware instead of PROLL, and how 
> > to
> > point QEMU to my Solaris installation CD image file.
>
> Just rename openbios-builtin.elf.nostrip to proll.elf. I don't know if 
> OpenBIOS can be compiled in Solaris, please report if you try.

It needs at least a GNU linker due to the ld scripts. And maybe GCC for
ELF support (at least on x86 this was an issue some time ago)
> > Do I need any hacks / patches to QEMU to use OpenBIOS instead of PROLL ?
>
> The attached patch to CVS version of Qemu fixes several critical problems 
> in Sparc emulation.

cool!
> > What debugging switches should I enable with QEMU to help me figure out why
> > things aren't working when trying to boot the SunOS 4.1.4 (Solaris 1.1.2)
> > installation CD ?
> >
> > Is there a "best way" to build OpenBIOS to ensure maximum useful debugging
> > information is produced ?
>
> I don't think Qemu debugging switches are that helpful, but enabling 
> CONFIG_DEBUG_OBP in OpenBIOS shows the OBP calls.

definitely, when you are trying to get OS<->Firmware communication up
and running.

Also, for compiling OpenBIOS/sparc32 on an x86 or amd64 machine I can
recomment Dan Kegel's crosstool which provides an easy method of
building cross compilers for about any platform:
http://www.kegel.com/crosstool/
> > If I'm repeating a whole lot of old questions, is there a FAQ for the QEMU
> >
> > OpenBIOS (Sparc32) combination that someone can point me to ?
>
> Well, the combination didn't even exist a couple of months ago...

Almost weeks even. This is pretty new ground and things are going to
improve over time..

Starting QEMU with OpenBIOS for Sparc32

[Stefan Reinauer]

* Blue Swirl  [060606 17:04]:
> The attached patch to CVS version of Qemu fixes several critical
> problems in Sparc emulation.

what exactly do they do? I attached them to yesterday's CVS and it 
did not fix booting solaris at least ;-)

The one problem with booting solaris is  that it is supposed to push
stuff to the stack which it doesn't do apparently, so OpenBIOS operates
on wrong values when doing the v2_eval function on the forth code.

Its unlikely that this alone will fix booting solaris, but as it is
definitely wrong at the moment and we dont get any error messages from
solaris except an exception its at least a start...

Any help is appreciated here.

If someone has boot CDs or ISO images of SunOS 4 / Solaris 2.4 or older,
any help in testing is very welcome.

Stefan

Starting QEMU with OpenBIOS for Sparc32

[Blue Swirl]

> > The attached patch to CVS version of Qemu fixes several critical
> > problems in Sparc emulation.
>
> what exactly do they do? I attached them to yesterday's CVS and it
> did not fix booting solaris at least ;-)

That's because Solaris has not reached userland yet. The fixes are:
Fix for MMU no-fault mode (Linux userland works)
RTC fix to correct the base year
Patch from Joerg Platte to fix FPU problems (cures a lot of segfaulting)

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