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 ac - cessed 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 sys
- tem. 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 under
- go special
processing in order to work around limitations of ATAPI de - vices. 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>.