hey,
so this turned out to be bad memory. removed the offending DIMM and everything is
now okay. thanks to everyone who responded w/suggestions.

-matt

Rick Kelly wrote:

> eeh@netbsd.org said:
>
> >       NMI: system interrupts: 40000000<VME=0,SBUS=0,ME>
>
> >I would guess that this is an IOMMU issue more than anything else.
> >Unfortunately, my familliarity with the sun4m IOMMU code is less than
> >ideal.  I would suggest dumping both the address the driver is trying
> >to DMA to and the contents of the IOMMU when you get this problem.  I
> >suspect that the page is not mapped.
>
> I've seen something like this.
>
> I installed NetBSD 1.5_ALPHA2 on a sparc 4 with 64 megs back in late
> August or early September. It was up until mid-February and worked
> perfectly. Then I started getting:
>
> Feb 14 19:30:18 yeti /netbsd: NMI: system interrupts: 40000000<VME=0,SBUS=0,ME>
>
> When executing commands and when booting the system. I first upgraded the
> OS to the NetBSD 1.5 release. Same problems. I decided that the motherboard
> must be sick and bought a sparc 5 with 32 megs of memory. I installed the
> disk and the memory from the sparc 4. Same problem cropped up after a few
> days. I removed the memory that had been in the sparc 4. and the sparc 5
> is now happily running along with 32 megs. Looks like one of the 2 32meg
> dimms that I removed is heat sensitive.
>
> --
> Rick Kelly  rmk@rmkhome.com  www.rmkhome.com