[johnnym]

Didn't have time to test during the weekend, but will have now. After re-reading the IP27 related code portions and some comparisons with what Linux has included for IP27* in the meantime I'm not so sure if it will work out of the box if at all.

*) Yeah, heard right, Linux had working support for IP27 in the past. There's still a dmesg log available on showing a 128 processor Origin2000 booting.

For example setting the interrupt masks with ip27_hub_setintrmask() seems to only operate for two processors. Though it always selects the current processor and from that sets the respective interrupt mask, so could theoretically work for other nodes than the master node, too, but I'm not sure about that.

What looks like the equivalent function for Linux - setup_hub_mask() - incorporates the "nasid" (I assume each processor board in an Origin2000 has its own nasid and each node of an Origin200 has its own nasid - am I correct with that?) which it determines from the current processor but otherwise looks like it does pretty much the same as OpenBSD's version.

So actually the interrupt masks don't differ between nodes but only between the two processors on each node and are the same for each node then. As Linux's version did work for multi-node systems (see the dmesg above) and OpenBSD's version looks like it would do the same, it might actually work when not skipping non-master node processors on an Origin200. But if it works, why didn't Miod never acivate it? I know he had or still has a dual-node Origin200 so could have tested it. Well I'll find out soon enough...