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  On a Symbios controller:
ncr0 at pci0 dev 19 function 0: NCR 53c875 Wide SCSI
ncr0: interrupting at irq 10
        initial value of SCNTL3 = 03, final = 13

  I have:

sd0 at scsibus0 targ 0 lun 0: <MICROP, 1588-15MBSUN0669, SN0C> SCSI1 0/direct fixed
sd0: 639MB, 1632 cyl, 15 head, 53 sec, 512 bytes/sec
sd1 at scsibus0 targ 1 lun 0: <DEC, RZ28     (C) DEC, 442E> SCSI2 0/direct fixed
sd1: sd1(ncr0:1:0): WIDE SCSI (16 bit) enabled
sd1(ncr0:1:0): 20.0 MB/s (100 ns, offset 15)
2007MB, 3045 cyl, 16 head, 84 sec, 512 bytes/sec
st0 at scsibus0 targ 6 lun 0: <ARCHIVE, Python 28849-XXX, 4.CM> SCSI2 1/sequential removable
st0: st0(ncr0:6:0): 5.0 MB/s (200 ns, offset 15)
drive empty
ch0 at scsibus0 targ 6 lun 1: <ARCHIVE, Python 28849-XXX, 4.CM> SCSI2 8/changer removable
ch0: 4 slots, 1 drive, 1 picker, 0 portals

  I'm running a -current kernel of mid-May vintage.
  
  When I do:

istari# chio status
chio: /dev/ch0: CHIOGSTATUS: Input/output error

  Syslog says:

Jun 10 14:59:51 istari.sandelman.ottawa.on.ca /netbsd: ch0(ncr0:6:1): extraneous data discarded.
Jun 10 14:59:51 istari.sandelman.ottawa.on.ca /netbsd: ch0(ncr0:6:1): COMMAND FAILED (9 0) @0xf877fc00.
Jun 10 14:59:51 istari.sandelman.ottawa.on.ca /netbsd: ch0(ncr0:6:1): extraneous data discarded.
Jun 10 14:59:51 istari.sandelman.ottawa.on.ca /netbsd: ch0(ncr0:6:1): COMMAND FAILED (9 0) @0xf877fc00.

  I had thought that some patches that I saw in -current to scsiconf.c
and friends had an entry for the 28849, but it was for the Python
28454-XXX. The quirk for the 28454-XXX is that it has no luns, but
I don't think the problem is related, since the 28849 does have luns.

  Does anyone have any advice? I'm going to contact Archive about a
full spec sheet. (hmm.... can't find them on the net)

   :!mcr!:            |  Network security programming, currently
   Michael Richardson | on contract with DataFellows F-Secure IPSec
 WWW: mcr@sandelman.ottawa.on.ca. PGP key available.

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