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ATAPICAM(4)	       FreeBSD Kernel Interfaces Manual		   ATAPICAM(4)

NAME
     atapicam -- CAM XPT (transport) module for	ATAPI devices

SYNOPSIS
     device atapicam

DESCRIPTION
     The ATAPI/CAM module allows ATAPI devices (CD-ROM,	CD-RW, DVD drives,
     floppy drives such	as Iomega Zip, tape drives) to be accessed through the
     SCSI subsystem, cam(4).

     ata(4) and	scbus(4) must be configured in the kernel as well.  The	SCSI
     target drivers (cd(4), da(4), or st(4)) can then be used to access	the
     devices.  The generic passthrough device, pass(4),	can also be used to
     send SCSI commands	directly to the	devices	through	the CAM	API.

     A separate	CAM bus	is created for each ATA	bus in the system.  On each of
     these buses, target ID 0 is assigned to the master	device,	and ID 1 is
     assigned to the slave (provided they are ATAPI devices).

IMPLEMENTATION NOTES
     Some SCSI commands	are intercepted	by the driver, and undergo special
     processing	in order to work around	limitations of ATAPI devices.  Such
     limitations can be	consequences of	the ATAPI specification.  For example,
     ATAPI devices do not implement the	6-byte versions	of MODE_SELECT,
     MODE_SENSE, READ, or WRITE.  They can also	be common bugs,	such as	hang-
     ing when queried for extended INQUIRY information.

EXAMPLES
	   device ata
	   device atapicam
	   device scbus
	   device cd
	   device pass

     Add the atapicam driver to	the kernel.

	   camcontrol devlist

     Print the list of all devices available through CAM.

	   mount -t cd9660 /dev/cd0 /mnt

     Mount a CD-ROM from an ATAPI CD-ROM drive (the command above assumes that
     the ATAPI drive is	the only CD-ROM	unit).

SEE ALSO
     ata(4), cam(4), scsi(4), atacontrol(8), camcontrol(8)

HISTORY
     The ATAPI/CAM driver first	appeared in FreeBSD 4.8	and FreeBSD 5.0.

AUTHORS
     The ATAPI/CAM driver was written by Thomas	Quinot <thomas@FreeBSD.org>.

BUGS
     atapicam and ATAPI-specific target	drivers	(acd(4), ast(4), and afd(4))
     can be configured in the same kernel.  Simultaneous access	to the same
     device through the	SCSI generic drivers and the ATAPI-specific drivers
     may cause problems	and is strongly	discouraged.

FreeBSD	6.0		       October 23, 2002			   FreeBSD 6.0

NAME | SYNOPSIS | DESCRIPTION | IMPLEMENTATION NOTES | EXAMPLES | SEE ALSO | HISTORY | AUTHORS | BUGS

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