OSIOP(4) - Device Drivers Manual #

OSIOP(4) - Device Drivers Manual

NAME #

osiop - Symbios/NCR 53C710 SCSI driver

SYNOPSIS #

**osiop* at gsc? irq 9 ** (hppa)

DESCRIPTION #

The osiop driver provides support for the Symbios/NCR 53C710 SCSI controller chip.

The Symbios/NCR 53C700 SCSI controller is handled by the [oosiop(4)](/man/man4/oosiop.4) driver, while the Symbios/NCR 53C8xx PCI SCSI host adapters are handled by the siop(4) driver.

CONFIGURATION #

The osiop driver supports the following flags for use in config(8) files:

bits 0-7:

disable disconnect/reselect for the corresponding SCSI target

bits 8-15:

disable synchronous negotiation for SCSI target

bits 16:

disable DMA interrupts

“Target” is synonymous with SCSI ID number.

Note that SCSI tape drives should be allowed to perform disconnect/reselect or performance will suffer.

SEE ALSO #

cd(4), ch(4), intro(4), [oosiop(4)](/man/man4/oosiop.4), scsi(4), sd(4), siop(4), st(4), uk(4)

HISTORY #

The osiop driver first appeared in NetBSD 1.6.

The original NCR 53C710 driver appeared in NetBSD 1.0 amiga port, and Izumi Tsutsui <tsutsui@ceres.dti.ne.jp> modified the driver and made it machine-independent.

OpenBSD 7.5 - February 17, 2022