IOMMU: Ran out of contexts. errors then the system reboots.

[Kieron Gillespie <ciaran.gillespie@gmail.com>]

So I just spent a week battling some really strange errors on my Sun
Blade 2500 system and I think I'm nearing something that could be
called stable. Except one last problem.

After a while of using the system I will get this message all over my dmesg log.

IOMMU: Ran out of contexts.

Then after a while of this the system will reboot all on it's own. I
was wondering if anyone else had experience with this problem.

-Kieron Gillespie