137 lines
4.2 KiB
Groff
137 lines
4.2 KiB
Groff
.\" Copyright (c) 1997
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.\" John-Mark Gurney. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. Neither the name of the author nor the names of any co-contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY John-Mark Gurney AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $Id: st.9,v 1.4 1997/03/07 02:53:37 jmg Exp $
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.\"
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.Dd February 1, 1997
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.Dt ST 9
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.Os FreeBSD
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.Sh NAME
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.Nm st
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.Nd device driver for SCSI subsystem
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.Sh DESCRIPTION
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The
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.Nm
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driver is for Type 1
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.Pq Dv T_SEQUENTIAL
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scsi devices. These devices are normally tape drives. Some tape drives
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require special handling by the device driver. See the QUIRKS section for
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information on handling broken devices.
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.Sh QUIRKS
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Each SCSI device can have problems that the driver needs to work around. See
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.Xr scsiconf 9
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for more info on adding quirks.
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.Bl -tag -width ST_Q_FORCE_FIXED_MODE
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.It ST_Q_NEEDS_PAGE_0
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This tells the driver that the device in question always requires a page
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0 on each MODE SELECT operation.
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.It ST_Q_FORCE_FIXED_MODE
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Forces the drive into fixed block mode.
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.It ST_Q_FORCE_VAR_MODE
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Forces the drive into variable block mode.
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.It ST_Q_SNS_HLP
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Drive requires a read of the tape before the mode sense will return useful
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information.
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.It ST_Q_IGNORE_LOADS
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Causes the driver to return without action when telling the drive to load
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a tape.
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.ig xx \" These seem to have become stale in the driver.
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.It ST_Q_BLKSIZ
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Use variable-block size even though media_blksiz is \&< 0.
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.It ST_Q_CC_NOMSG
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This drive doesn't accept message when in CC state.
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.xx
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.It ST_Q_NO_1024
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Never use 1024-byte fixed blocks with this drive.
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.It ST_Q_NO_SYNC
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Disable synchronous negotiation with the drive.
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.It ST_Q_NO_FAST
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Disable fast negotiation with the drive.
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.It ST_Q_NO_WIDE
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Disable wide negotiation with the drive.
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.El
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The
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.Xr st 4
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driver uses the
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.Dv void* devmodes
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entry of
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.Dv struct scsidevs
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.Po
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see
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.Xr scsiconf 9
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for more info
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.Pc
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to point to a
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.Dv struct st_mode st_modes[4]
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array.
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This provides the four different modes for the subdevices accessible by the
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.Nm
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driver.
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.Bd -literal -offset indent
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struct st_mode {
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u_int32_t blksiz;
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u_int16_t quirks;
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u_int8_t density;
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u_int8_t spare[1];
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};
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.Ed
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.Pp
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.Bl -tag -width space[1] -compact
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.It blksize
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This is the fixed block size to use.
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.It quirks
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Specifies the quirk flags to use, overriding general quirk flags for
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that drive.
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.It density
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Specifies the density used for this mode. See the file
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.Pa /sys/scsi/scsiconf.h
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for a list of the possible defines to use here.
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.It spare[1]
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Unused.
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.El
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.Sh FILES
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.Bl -tag -width /sys/scsi/scsiconf.h -compact
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.It Pa /sys/scsi/scsiconf.h
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contains the
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.Dv ST_Q_xxx
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macro defines and the density defines
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.It Pa /sys/scsi/st.c
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files contains actual driver code
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.El
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.Sh SEE ALSO
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.Xr st 4 ,
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.Xr scsiconf 9
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.Sh HISTORY
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The
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.Nm
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manual page first appeared in
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.Fx 2.2 .
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.Sh AUTHORS
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This
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manual page was written by
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.An John-Mark Gurney Aq gurney_j@efn.org .
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