[net.unix-wizards] uba0: too many zero vectors

eww (02/28/83)

HELP!  I am installing some new Able  DH/DM  boards  on  our  VAX
11/780  running  4.1bsd  and  get  the  following  message on the
console:

      uba0: too many zero vectors
      uba0: reset dz0 dz1 dz2 dz3 dz4 dz5 dz6 dh0 dh1 dh2 lp0

After this prints out a few times, the unibus  locks  up  and  we
crash.   This doesn't happen until I connect a terminal to one of
the ports on the  distribution  panel.   The  csr  and  interrupt
vectors are as follows:

      lp0 at uba0 csr 177514 vec 200, ipl 14
      dm0 at uba0 csr 170500 vec 210, ipl 14
      dm1 at uba0 csr 170510 vec 220, ipl 14
      dm2 at uba0 csr 170520 vec 230, ipl 14
      dh0 at uba0 csr 160500 vec 240, ipl 15
      dh1 at uba0 csr 160520 vec 250, ipl 15
      dh2 at uba0 csr 160540 vec 260, ipl 15
      dn0 at uba0 csr 175200 vec 300, ipl 15
      dz0 at uba0 csr 160100 vec 310, ipl 15
      dz1 at uba0 csr 160110 vec 320, ipl 15
      dz2 at uba0 csr 160120 vec 330, ipl 15
      dz3 at uba0 csr 160130 vec 340, ipl 15
      dz4 at uba0 csr 160140 vec 350, ipl 15
      dz5 at uba0 csr 160150 vec 360, ipl 15
      dz6 at uba0 csr 160160 vec 370, ipl 15

What does this error message mean?  I took a look at uba.c and it
looks as though this message gets printed out when there are over
250000 zero vectors.  What would  cause  that?   Thanks  for  any
help.

		Ed (wheps!eww)
		E. W. Whelan, Jr.
		Bell Laboratories, Room 6D-110
		Whippany N.J. 07981 Phone 201-386-4799    Lab X7468

ask.ISL@Sumex-Aim (03/29/83)

	I experienced a similar problem while trying to install an AED512
DMA interface on our 11/780 running 4.1BSD.  The problem was that the
NPR jumper was not removed (the default is NPR installed) on the Unibus and
this led to the bypassing of the device when a bus grant was made.  Thus the
CPU sees no interrupt vector.  This happens at boot-time  whenwhen all the
devices on the bus are recognized and their addresses etc. are loaded.

When the NPR jumper was removed, the problem went away.  To find out 
which pins correspond to the jumper, check the Unibus descriptions 
(my recollection is that the pins are CA1-CA2, but I am not quite sure).
					
						   Krishna
					Information Systems Lab.
					   Stanford University

						ask@SU-DSN.ARPA or
						ask@SU-ISL.ARPA
				(I think this is how I can be reached)