Re: [OpenBIOS] SunOS 5.8 64bit emulate SUNW, Ultra 2

[Mark Cave-Ayland]

On 13/02/18 13:15, Weidemann, Maik (M-SO) wrote:

Hi Maik,
> Hello,
>
> I try do emulate / virtualize a very old Sun Workstation Ultra 2 with a SunOs 5.8 with KVM/qemu.
> As host system I use a Ubuntu 17.10 with the qemu packages from  http://ppa.launchpad.net/jacob/virtualisation/ubuntu.
> The qemu Version is:
> QEMU emulator version 2.11.0(Debian 1:2.11+dfsg-1ubuntu1~ppa0)
>
> I tried to start a virtual machine with the default bios (Version: 1.1.git20161120-2). But I get this error message:
> # qemu-system-sparc64 -nographic -drive unit=1,file=sun14_disk.raw,format=raw
> OpenBIOS for Sparc64
> set_property: NULL phandle
> set_property: NULL phandle
> Unhandled Exception 0x0000000000000030
> PC = 0x00000000ffd0f6b8 NPC = 0x00000000ffd0f6bc
> Stopping execution

Yes, unfortunately that combination of QEMU/OpenBIOS won't work because 
at the moment there is no way to pass the device tree from QEMU to 
OpenBIOS and so the two must generally be kept in sync. Hopefully this 
requirement will be something that can be relaxed in time.
> I see that was some new commits at the git repository, so I clone the repo an build a new openbios-file (https://www.openbios.org/OpenBIOS#Building_OpenBIOS) an start the vm with this new bios. But I get also a error message:
> # qemu-system-sparc64 -nographic -drive unit=1,file=sun14_disk.raw,format=raw -L . -bios openbios-builtin.elf
> Unhandled Exception 0x0000000000000030
> PC = 0x00000000ffd21368 NPC = 0x00000000ffd2136c
> Stopping execution

Something definitely looks wrong there - for 2.11 have you tried 
grabbing the relevant OpenBIOS binary direct from git? It's available as 
a direct download from 
https://git.qemu.org/?p=qemu.git;a=blob;f=pc-bios/openbios-sparc64;h=a4a3b8d....
> Is it even possible to emulate a Sun Sparc Ultra 2 with a SunOs 5.8 (64bit)?
> SunOS satnw014 5.8 Generic_108528-06 sun4u sparc SUNW,Ultra-2

The default sun4u model emulates an Ultra 5, so assuming your image 
contains enough drivers then in theory you should be able to at least 
boot into the kernel and get somewhere close to userspace.

To the best of my knowledge the main outstanding feature missing from 
the SPARC64 emulation preventing it from booting SunOS is the MMU IE bit 
which is required to program PCI devices. I suspect this will still be 
the case for SunOS 5.8.

There has been a lot of work done over the past couple of releases to 
fix up all the PCI bridge issues so I would hope that getting 
qemu-system-sparc64 to boot Solaris 64-bit is now within reach, so watch 
this space :)

ATB,

Mark.