135 lines
4.1 KiB
Groff
135 lines
4.1 KiB
Groff
.\" Copyright (c) 2002, 2004
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.\" Thomas Quinot <thomas@FreeBSD.org>. 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 THE AUTHOR 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 AUTHOR OR CONTRIBUTORS
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.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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.\" THE POSSIBILITY OF SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd October 22, 2009
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.Dt ATAPICAM 4
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.Os
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.Sh NAME
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.Nm atapicam
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.Nd CAM XPT (transport) module for ATAPI devices
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.Sh SYNOPSIS
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To compile this driver into the kernel,
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place the following lines in your
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kernel configuration file:
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.Bd -ragged -offset indent
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.Cd "device scbus"
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.Cd "device ata"
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.Cd "device atapicam"
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.Ed
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.Pp
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Alternatively, to load the driver as a
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module at boot time, place the following line in
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.Xr loader.conf 5 :
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.Bd -literal -offset indent
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atapicam_load="YES"
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.Ed
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.Sh DESCRIPTION
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The ATAPI/CAM module allows ATAPI devices (CD-ROM, CD-RW, DVD drives,
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floppy drives such as Iomega Zip, tape drives) to be accessed through
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the SCSI subsystem,
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.Xr cam 4 .
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.Pp
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.Xr ata 4
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and
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.Xr scbus 4
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must be configured in the kernel as well.
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The SCSI target drivers
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.Xr ( cd 4 ,
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.Xr da 4 ,
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or
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.Xr st 4 )
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can then be used to access the devices.
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The generic passthrough device,
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.Xr pass 4 ,
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can also be used to send SCSI commands directly
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to the devices through the CAM API.
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.Pp
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A separate CAM bus is created for each ATA bus in the system.
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On each of these buses, target ID 0 is assigned to the master
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device, and ID 1 is assigned to the slave
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(provided they are ATAPI devices).
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.Sh IMPLEMENTATION NOTES
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Some SCSI commands are intercepted by the driver, and undergo special
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processing in order to work around limitations of ATAPI devices.
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Such limitations can be consequences of the ATAPI specification.
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For example, ATAPI devices do not implement the 6-byte versions
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of
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.Dv MODE_SELECT , MODE_SENSE , READ ,
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or
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.Dv WRITE .
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They can also be common bugs, such as hanging when queried for
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extended
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.Dv INQUIRY
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information.
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.Sh EXAMPLES
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.Bd -literal -offset indent
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device ata
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device atapicam
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device scbus
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device cd
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device pass
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.Ed
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.Pp
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Add the
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.Nm
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driver to the kernel.
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.Pp
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.Dl "camcontrol devlist"
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.Pp
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Print the list of all devices available through CAM.
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.Pp
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.Dl "mount -t cd9660 /dev/cd0 /mnt"
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.Pp
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Mount a CD-ROM from an ATAPI CD-ROM drive
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(the command above assumes that the ATAPI drive is the only CD-ROM unit).
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.Sh SEE ALSO
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.Xr ata 4 ,
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.Xr cam 4 ,
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.Xr scsi 4 ,
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.Xr atacontrol 8 ,
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.Xr camcontrol 8
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.Sh HISTORY
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The ATAPI/CAM driver first appeared in
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.Fx 4.8
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and
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.Fx 5.0 .
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.Sh AUTHORS
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The ATAPI/CAM driver was written by
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.An Thomas Quinot Aq thomas@FreeBSD.org .
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.Sh BUGS
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.Nm
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and ATAPI-specific target drivers
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.Xr ( acd 4 ,
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.Xr ast 4 ,
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and
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.Xr afd 4 )
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can be configured in the same kernel.
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Simultaneous access to the same device through the SCSI generic drivers
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and the ATAPI-specific drivers may cause problems and is strongly discouraged.
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