New SCO OpenServer 5 features
The following list highlights new SCO OpenServer 5 Release 5 features
that you may want to incorporate into drive
being ported from earlier SCO systems.
These features have been implemented
so that older drivers that do not use them
will run on SCO OpenServer 5 Release 5 without modification.
SCO OpenServer 5 Release 5 supports distributed interrupts
on multiprocessor systems.
function (SCSI host adapter drivers only)
to register a driver that supports distributed interrupts.
do not need to be modified to support
but their performance may be enhanced
on some MP platforms
by making these modifications.
Kernel functions to support devices
connected to a PCI bus.
kernel function to register the base level routines
of STREAMS drivers as multithreaded;
kernel function to register the interrupt level
of any driver as multithreaded.
Multithreading STREAMS drivers
enhances performance for network adapter drivers
on multiprocessor platforms.
SCO OpenServer 5 Release 5 STREAMS are SVID/3 compatible
and have been enhanced to support many of the features
provided in the SVR4 STREAMS implementation.
Note, however, that the kernel interface
for SCO OpenServer 5 Release 5 STREAMS
are based on the SVR3 STREAMS implementation.
For more information, see
``SCO OpenServer 5 Release 5 STREAMS interface''.
Device Query Interface (DQI)
provides a consistent and reliable mechanism
for user-level programs
to determine which devices are attached to the system.
Existing non-SCSI disk and tape drivers
should be modified to support the DQI.
Drivers that are not modified will still run on SCO OpenServer 5
but ScoAdmin and other utilities
that use DQI will not be able to
access your device unless the driver is modified.
Note that all SCSI peripheral and host adapter drivers
automatically have DQI support on SCO OpenServer 5 Release 5.
The generic SCSI configuration driver,
Scfg, provides the DQI information
so SCSI drivers do not require
special coding to get DQI support.
SCSI multi-channel support
file, the bootstring,
and the SCSI request block structure
used in SCSI drivers
support an additional parameter,
for each SCSI device.
If a SCSI host adapter has multiple channels,
its driver should take advantage of this parameter
to allow selection of the channel
where a particular device is attached.
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