DPT SCSI host adapter subsystem
The dpt host adapter subsystem enables SCSI target
drivers (such as sd01 and st01) to communicate
on the SCSI bus with target controllers and logical units.
This driver implements the Storage Device Interface (SDI)
for such SDI target drivers.
This driver supports hot insertion and removal of devices on the
SCSI bus using the
It supports DPT WIDE SCSI controllers.
It is also possible for an application to access the SCSI bus
subsystem directly by using the pass-through interface.
The DPT host adapter driver honors the command timeout
values as specified in the scb structure;
A software watchdog timer enforces the processing time limit.
When the watchdog timer detects a job
that has exceeded its processing time limit,
it attempts to abort the job with a SCSI Job Abort Message.
The driver also enforces a time limit on the abort process,
ensuring that jobs that timeout are reported
to the sending SDI Target Driver whether or not the abort
The DPT SCSI adapter will not work reliably with the
Emulex SCSI/ESDI bridge controller (also known as the
In the future, a hardware or software solution
might be implemented.
For ISA DPT controllers to work,
the I/O ports must be set to secondary/disabled.
The following command is supported:
reads the extended Equipped Device Table (EDT)
data structure that is
stored in the dpt driver's internal data structure
Extreme caution should be exercised when using the pass-through interface.
It is possible to interfere with normal system I/O and cause hangs
if pass-through is used to an active device.
Pass-through should only be used to a device that is otherwise quiescent.
© 2005 The SCO Group, Inc. All rights reserved.
SCO OpenServer Release 6.0.0 - 02 June 2005