trusty (4) atapicam.4freebsd.gz

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


SYNOPSIS
     To compile this driver into the kernel, place the following lines in your kernel configuration file:

           device scbus
           device ata
           device atapicam

     Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5):

           atapicam_load="YES"


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 hanging 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.