atapicam -- CAM XPT (transport) module for ATAPI devices
device atapicam
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).
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.
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/cd0c /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).
ata(4), cam(4), scsi(4), atacontrol(8), camcontrol(8)
The ATAPI/CAM driver first appeared in FreeBSD 4.8 and FreeBSD 5.0.
The ATAPI/CAM driver was written by Thomas Quinot <[email protected]>.
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 5.2.1 October 23, 2002 FreeBSD 5.2.1 [ Back ] | 