I'm using kernel version 2.1.108 compiled for SMP on a Tyan Tomcat II Dual
Pentium Mainboard. 3 harddiscs, a mo drive and a CD-ROM are connected to an
Adaptec 2940U controller. Everything works great together with Linux when
using normal fast SCSI-II mode and ultra support disabled using the
controllers BIOS setup. No timeouts or other problems on the drives.
But what happens if I enable ultra SCSI support?
The inquiry on startup from the Adaptec BIOS works normal with ultra
support enabled. The Linux kernel is loadad quickly by the controller-BIOS
from the harddisc with ID 0 (a Fujitsu 508 MB drive, not ultra capable).
But Linux won't even start. It will hang after printing "(scsi0:0:-1:-1)
Scanning channel for devices." with a endless loop of messages telling me
"... timed out - resetting", "timed out again - trying harder" and so on.
The SCSI bus is terminated active on both ends and the following devices are
attachted to the controller. IMHO this problem is not hardware related,
perhaps a bug in the SCSI driver, because even inquiry on the first device
(non ultra capable) won't work.
cat /proc/scsi/aic7xxx/0 tells me this version number:
Adaptec AIC7xxx driver version: 5.0.19/3.2.4
Compile Options:
AIC7XXX_RESET_DELAY : 5
AIC7XXX_TAGGED_QUEUEING: Adapter Support Enabled
Check below to see which
devices use tagged queueing
[...]
The following devices are attached:
Attached devices:
Host: scsi0 Channel: 00 Id: 00 Lun: 00
Vendor: FUJITSU Model: M2684S-512 Rev: 2036
Type: Direct-Access ANSI SCSI revision: 02
Host: scsi0 Channel: 00 Id: 01 Lun: 00
Vendor: SEAGATE Model: ST51080N Rev: 0913
Type: Direct-Access ANSI SCSI revision: 02
[This following Micropolis drive is U-SCSI capable, I enabled the ultra
option because of this (amazing fast) disc drive]
Host: scsi0 Channel: 00 Id: 02 Lun: 00
Vendor: MICROP Model: 4343NS Rev: X502
Type: Direct-Access ANSI SCSI revision: 02
Host: scsi0 Channel: 00 Id: 03 Lun: 00
Vendor: PLEXTOR Model: CD-ROM PX-6XCS Rev: 1.00
Type: CD-ROM ANSI SCSI revision: 02
Host: scsi0 Channel: 00 Id: 04 Lun: 00
Vendor: FUJITSU Model: M2512A Rev: 1502
Type: Optical Device ANSI SCSI revision: 02
Thanks a lot for your help
Carsten
-- Carsten Gross carsten@sol.wohnheim.uni-ulm.de Wohnheim Heilmeyersteige Sebastian Kneipp Weg 6, 89075 Ulm
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