pcscsi - low-level module for the AMD PCscsi, PCscsi II,
PCnet-SCSI, and Qlogic QLA510 PCI-to-SCSI bus adapters
The pcscsi module provides low-level interface functions
between the common disk/tape I/O subsystem and the Am53C974
(PCscsi), Am53C974A (PCscsi II), Am79C974 (PCnet-SCSI) (SCSI
device only), and the Qlogic QLA510 SCSI controllers.
The pcscsi module can be configured for disk and streaming
tape support for one host bus adapter device. Each host bus
adapter device must be the sole initiator on a SCSI bus.
Auto-configuration code determines if the adapter is present
on the PCI bus, what its configuration is, and what types of
devices are attached to it.
For PCI devices, configuration is done through the PCI
BIOS. Configuration settings can be accessed through a CMOS
The net component of the PCnet-SCSI host bus adapter
requires the Solaris pcn(7D) driver. See AMD PCnet Ethernet
(PCnet-PCI, PCnet-PCI II, PCnet-Fast for information on Eth-
ernet configuration capabilities.
Known Problems and Limitations
Occasional data corruption has occurred when pcn and pcscsi
drivers in HP Vectra XU 5/90 and Compaq Deskpro XL systems
are used under high network and SCSI loads. These drivers do
not perform well in a production server. A possible wor-
karound is to disable the pcn device with the system BIOS
and use a separate add-in network interface.
The SCSI tagged queuing option is not supported.
The driver attempts to initialize itself in accordance with
the PCI BIOS configuration settings..
There are no user-configurable options; information found in
the pcscsi.conf configuration file is used by the I/O sub-
See attributes(5) for descriptions of the following attri-
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
| Architecture | x86 |
driver.conf(4), sysbus(4), attributes(5)
Man(1) output converted with