.\" Copyright (c) 1996
.\"	Julian Elischer <julian@freebsd.org>.  All rights reserved.
.\"
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.\" $FreeBSD$
.\"
.Dd August 27, 1993
.Dt SU 4
.Os FreeBSD
.Sh NAME
.Nm su
.Nd scsi user-level driver
.Sh SYNOPSIS
.Cd "pseudo-device su"
.Sh DESCRIPTION
The
.Nm su
driver provides support for a 
process to address arbitrary locations on the scsi bus.
Minor
numbers are mapped 1:1 to bus:target:lun.
The lowest three bits being LUN
and the next three bits being TARGET.
Remaining bits are the bus number.
.Pp
A scsi adapter must also be separately configured into the system
before this driver makes sense.
.Pp
.Sh KERNEL CONFIGURATION
There are no configuration parameters for the su option.
It's either there
or it's not.

.Pp
.Sh IOCTLS
The 
.Nm
driver has no ioctls of it's own but rather acts as a medium for the
generic 
.Xr scsi 4
ioctls.
These are described in
.Em sys/scsiio.h.


.Sh FILES
.Bl -tag -width /dev/su0-0-0XXXXXXXXXXX -compact
.It Pa /dev/su[0-9]-[0-7]-[0-7]
su{x}-{y}-{z} is the su device for the device at bus x, target y, lun z
.El
.Sh DIAGNOSTICS
All
.Xr scsi 4
debug ioctls work on 
.Nm
devices.
.Sh SEE ALSO
.Xr cd 4 ,
.Xr scsi 4 ,
.Xr sd 4 ,
.Xr ssc 4 ,
.Xr st 4 ,
.Xr uk 4
.Sh HISTORY
The
.Nm
driver appeared in 386BSD 0.1.