Hello, and thank you all for your comments so far.

Still, my KFQSA is giving me headaches..

To summarize what had happened until now:

I have a KFQSA in a MV3400 (ka640 cpu). I have a spare ka650 cpu. I have
3 RF71 drives connected. The whole shebang is running 1.5.2.
DSSI Termination shoudl be correct, and the KFQSA has been configured
correctly, i would say.

The MV3400 runns for weeks without problems as long as i disable the
cache-
enabling code in ka650.c.

If i use a kernel with enables the CPU cache, i get errors like
	/netbsd: uda1: controller error, sa=0101510 (unknown error code)
within minutes of operation.

Sometimes, the error code is 0101511. Never somethin else
Sometimes, a stray interrupt (vector 0x318, ipl 23) hits just befor the
controller error. But this rarely happens at all and has probably no
significance.

The error occurs only when i run the ka640 or ka650 with enabled
CPU-caches.
Theoretically, this should not matter, but it does here.

Additionaly, it seems like the error comes only when the controller has
to
switch between drives, as in a file copy from one partition to another
and
the partitions live on different drives. Or, during fsck at startup,
when
two or more drives are affected.
A simple "cp" is enough...

I've put the KFQSA into another, "known good" VAX (a MV3500), and get
the same
problems with NetBSD 1.5.2. So it might be the controller.

I then tried OpenVMS, and alas! everything worked! Even with 2 disks.
I do not actually know whether VMS enables the CPU cache, but i would
think so.

So, is there someone using a KFQSA with more than one drive, with a
ka640
or ka650 cpu?
Does this work with 1.5 or higher for you?

I am prepared to dig into the mscp-driver (well, mentaly prepared. My
wife
calls this a "hyperventilating ego"...), but only if i am at least a
little
bit convinced that it is a driver bug. After all, my KFQSA could still
be broken...


Thank you, and sorry for the far too long post.

ms

-- 
Michael Schneider                       email: ms@silke.rt.schwaben.de
Germany                                  http://www.vaxcluster.de

            People disagree with me.  I just ignore them.
                         (Linus Torvalds)