Hello,
I have installed NetBSD 4.0 on several SS20's and rebuilt a SMP
kernel without any trouble. I have seen a very strange panic when I use
dual RT626 (two HyperSPARC's on the same MBus module).
With 2 SuperSPARC-II (SM71) -> OK
With 2 HyperSPARC (RT626) in two modules -> OK
With 2 HyperSPARC (RT626) in one module -> I randomly obtain NMI
interrupt error.
I have tested with four different SS20's with and without HIGHMEM
(and SUNvts does not report any errors on this hardware). This bug only
occurs when two CPU share the same Mbus slot.