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SIOP(4) Device Drivers Manual SIOP(4)

siopLSI/Symbios Logic/NCR 53c8xx SCSI interface

siop* at pci?

# hppa
siop* at mainbus? irq 3
siop* at phantomas? irq 3
siop* at uturn? irq 3

The siop driver provides support for following LSI/Symbios Logic/NCR 53c8xx and related SCSI controller chips:

siop replaces the older ncr driver which supported most of these devices.

Older 53C700 and 53C710 controllers are supported by the oosiop(4) and osiop(4) drivers, respectively.

cd(4), ch(4), intro(4), oosiop(4), osiop(4), pci(4), scsi(4), sd(4), st(4), uk(4)

The siop driver first appeared in NetBSD 1.5, OpenBSD support was added in OpenBSD 2.9.

The siop driver was written by Manuel Bouyer <> for NetBSD. It was ported to OpenBSD with 53c1010 support added by Ken Westerback <> using code from the FreeBSD sym-2 driver written by Gerard Roudier <>.

October 22, 2013 OpenBSD-6.4