sparc64 hang with zfs v28

[Marius Strobl]

On Thu, Mar 24, 2011 at 02:37:52PM +0100, Martin Matuska wrote:
> I agree to the patch, that is exactly what I was missing in the v15
> compat code.
> 
> Too bad that I don't have a sparc64 to test these things out and get
> smarter. I am investigating now if its possible to emulate it with qemu.

AFAIK qemu supports some rudimentary sun4u emulation but emulates
hardware that doesn't exist/work in reality (like a VGA card with
VESA BIOS instead of FCode) or at least not in a combination
reflecting a real machine, obviously so they could re-use some
existing emulated PC components. Linux likely has some hacks to
make this work but I doubt FreeBSD will run as is. If you give
this a try your only chance currently would be to configure
qemu to use a serial console but I still wouldn't hold my breath.
I once used Simics to develop support for Ex000-class machines
I hadn't access to myself. This basically worked but wasn't very
usable due to bugs in the emulation of the SCSI HBA and the Sun
Ethernet controller. Simics also supports emulating some machines
like Blade 1500 are equipped with PC-like components like a bge(4)
compatible NIC and a ATA controller in the first place, which I'd
expect to be less buggy. I haven't tried this my self so far though.

Marius