SCSI Terminator problem?

SCSI Terminator problem?

Post by Sharan Kalwa » Sat, 03 Feb 1996 04:00:00

hello folks!

I recently installed a Future Domain TMC-1680 SCSI-2 ISA card and when I power
up the system, the Phoenix BIOS seems to lock up on me.

It seems to detect the card alright but when the tape drive attached
to the controller whirs and responds to the scsi reset and then it falls silent,
and the system stays locked at the BIOS level....

The only way I get out of the lock is to unplug the scsi-2 <-> centronics 50 pin
connector momentarily, which is hooked to the WANGTEK 525 tape drive.
Or sometimes I power the tape drive (external) off and on ... that also works.
It is only at this point, the BIOS/TMC combo gets out of the lock and
I see a message:

ID 6 (Firmware Rev S )

show up on the console and then the lilo boot takes over
(no problem with the lilo of the linux kernel).

My question is: could this be because i have a PASSIVE Centronics terminator on
on the WANGTEK ? Or it is due to something funky on the FDomain TMC-1680 card?
Maybe i have to dish out big money for a SCSI sniffer to find out why it
hangs on the device/host probe (after correctly discovering the card
is there)?

I am enclosing the output of 'dmesg' (since linux itself has no problem once I
do the annoying connector plug/unplug business)....

bash$ dmesg
Console: colour EGA+ 80x25, 1 virtual console (max 63)
bios32_init : BIOS32 Service Directory structure at 0x000fff70
bios32_init : BIOS32 Service Directory entry at 0xfc799
pcibios_init : PCI BIOS revision 2.00 entry at 0xfc9bd
Probing PCI hardware.
Calibrating delay loop.. ok - 36.08 BogoMips
Serial driver version 4.11 with no serial options enabled
tty00 at 0x03f8 (irq = 4) is a 16550A
tty01 at 0x02f8 (irq = 3) is a 16550A
lp1 at 0x0378, using polling driver
PS/2 auxiliary pointing device detected -- driver installed.
snd4 <Gravis UltraSound MAX (512k)> at 0x220 irq 11 drq 1
hda: WDC AC31000H, 1033MB w/128KB Cache, LBA, CHS=525/64/63, MaxMult=16
hdb: WDC AC31600H, 1549MB w/128KB Cache, LBA, CHS=787/64/63, MaxMult=16
hdc: FX001DE, ATAPI, CDROM drive
ide1: secondary interface on irq 15
ide0: primary interface on irq 14
Floppy drive(s): fd0 is 1.44M
FDC 0 is a post-1991 82077
scsi0 <fdomain>: BIOS version ?.?. at 0xc8000 using scsi id 7
scsi0 <fdomain>: TMC-18C30 chip at 0x140 irq 10
scsi0 : Future Domain TMC-16x0 SCSI driver, version 5.26
 scsi : 1 host.
  Vendor: WANGTEK   Model: 5525ES SCSI REV1  Rev: 6H9
  Type:   Sequential-Access                  ANSI SCSI revision: 01
Detected scsi tape st0 at scsi0, id 6, lun 0
scsi : detected 1 SCSI tape total.
Memory: 14752k/16384k available (748k kernel code, 384k reserved, 500k data)
This processor honours the WP bit even when in supervisor mode. Good.
Swansea University Computer Society NET3.019
Swansea University Computer Society TCP/IP for NET3.019
IP Protocols: ICMP, UDP, TCP
PPP: version 0.2.7 (4 channels) NEW_TTY_DRIVERS OPTIMIZE_FLAGS
TCP compression code copyright 1989 Regents of the University of California
PPP line discipline registered.
Checking 386/387 coupling...
Checking 'hlt' instruction... Ok.

T 1996
Partition check:
  hda: disabled multiple mode
  hda: hda1 hda2 hda3 hda4
  hdb: disabled multiple mode
  hdb: hdb1
 VFS: Mounted root (ext2 filesystem).
Adding Swap: 34268k swap-space
hdc: media changed
hdc: media changed
VFS: Disk change detected on device 22/0
Max size:330716   Log zone size:2048
First datazone:76   Root inode number 155648
ISO9660 Extensions: RRIP_1991A
here is what /proc shows me....
bash$ cat /proc/devices
Character devices:
 1 mem
 4 ttyp
 5 cua
 6 lp
 7 vcs
 9 st
10 mouse
14 sound
21 sg

Block devices:
 2 fd
 3 ide0
22 ide1
bash$ cat /proc/interrupts
 0:   399013   timer
 1:     6276   keyboard
 2:        0 + cascade
 3:   732984 + serial
10:       52 + fdomain
11:      158 + sound
12:    62146   PS/2 Mouse
13:        1   math error
14:   114192 + ide0
15:       17 + ide1
bash$ cat /proc/ioports
0000-001f : dma1
0020-003f : pic1
0040-005f : timer
0060-0060 : kbd
0064-0064 : kbd
0070-007f : rtc
0080-009f : dma page reg
00a0-00bf : pic2
00c0-00df : dma2
00f0-00f1 : npu
00f8-00ff : npu
0140-014f : fdomain
0170-0177 : ide1
01f0-01f7 : ide0
02f8-02ff : serial(auto)
0376-0376 : ide1
0378-037a : lp
03d4-03d5 : ega+
03f6-03f6 : ide0
03f8-03ff : serial(auto)

all clues welcome!

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1. sanity check on scsi terminator settings, please

Hi All,

I've got a Compaq DeskPro with a integrated AM73C974 scsi controller.  The
problem is that I keep getting i/o errors with the disks while installing
RH7.2.  I heard once that wrong scsi terminator settings (or drive parity
settings) on the scsi chain can cause inconsistant reads and writes.  Is
that true?

I have on the cable (in order from the controller on out):

controller at id:12
scsi hard disk a at id:4
scsi CDROM at id:2
scsi hard disk b at id:0.

I have the terminator on disk b since it's on the end of the chain and it's
set to get terminator power from the drive.  There's no way I can tell if
the scsi controller itself has to be terminated - I doubt it.

I ran Seagate OnTrack Diagnostics on the two drives and there were no errors
on the surface scan.  My root file system is 1048Meg and this doesn't
include the various mounts on other partitions for /usr/local, /var, /tmp,
etc.  So, I should have LOTS of disk.

Any ideas would be appreciated!

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