Subject: Re: Kernel fun
To: Mauricio Tavares <Mauricio@proedint.com>
From: Michael L. Hitch <mhitch@lightning.msu.montana.edu>
List: port-pmax
Date: 08/27/1999 20:19:01
On Fri, 27 Aug 1999, David Brownlee wrote:

> On Fri, 27 Aug 1999, Mauricio Tavares wrote:
> 
> > [...]
> > Automatic boot in progress: starting file system checks.
> > /dev/rrz0a: file system is clean; not checking
> > /dev/rrz0d: file system is clean; not checking
> > /dev/rrz0f: file system is clean; not checking
> > asc_intr: ignoring strange interrupt tc 8154 fifo residue 3 script 1
> > setting tty flags
> > asc_intr: ignoring strange interrupt tc 990 fifo residue 3 script 1
> >  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> >   Is that some kind of problem with the code for the SCSI interface?  If so,
> >   it makes me think that I got the wrong version of the kernel even though
> >   I used the one that *was* in the current source tree.  Could I have
> > missed   the one Simon has corrected?
> 
> 	Definitely looks live a scsi drive issue. For entertainment value
> 	you could probably check termination and cables, but I think
> 	someone who knows something about the pmax scsi driver is going
> 	to have to answer that one :)

  I guess that 'someone' must be me :-)

  That message is just an informational message.  The pmax scsi driver is
based on the Mach kernel driver, and seems to have also inherited the same
quirks as the Mach driver.  This particular case occurs when a device
reconnects and restarts a DMA operation.  The driver then gets a "bus
service" interrupt, but the DMA transfer running happily along.  The
driver just ignores the interrupt and the transfer seems to completes
normally.

Michael

---
Michael L. Hitch			mhitch@montana.edu
Computer Consultant
Information Technology Center
Montana State University	Bozeman, MT	USA