67 lines
1.2 KiB
Groff
67 lines
1.2 KiB
Groff
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.Dd March 2, 1995
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.Dt PT 4
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.Os FreeBSD
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.Sh NAME
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.Nm pt
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.Nd scsi processor type driver
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.Sh SYNOPSIS
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.Nm device pt0 at scbus?
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.Sh DESCRIPTION
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The
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.Xr pt
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driver provides support for a
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SCSI processor type device. These are usually scanners and other
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devices using the SCSI link as a communication interface with device
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specific commands embedded in the data stream.
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.Pp
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A scsi adapter must be separately configured into the system
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before this driver can be used.
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.Pp
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This device only supports
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.Xr read 2
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and
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.Xr write 2 ,
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and the general scsi ioctl calls.
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.Sh IOCTLS
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The
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.Nm
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driver has no ioctls of it's own but rather acts as a medium for the
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generic
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.Xr scsi 4
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ioctls. These are described in
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.Em sys/scsiio.h.
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.Sh FILES
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.Bl -tag -width /dev/pt -compact
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.It Pa /dev/pt[0-255]
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pt{x} is the 'xth' processor device.
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.El
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.Sh DIAGNOSTICS
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The
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.Em "at scbus?"
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is required in the config file for the configuration
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system to know this is a SCSI device and generate the appropriate
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tables.
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.Pp
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The 0 in
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.Em pt0
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in the configuration is required.
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This is a bug in
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.Xr config 8 .
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.Pp
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All
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.Xr scsi 4
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debug ioctls work on
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.Nm
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devices.
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.Sh SEE ALSO
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.Xr sd 4
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.Xr st 4
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.Xr cd 4
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.Xr ch 4
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.Xr su 4
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.Xr scsi 4
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.Sh HISTORY
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The
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.Nm
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driver appeared in FreeBSD 2.1
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