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35 .Nd CAM XPT (transport) module for ATAPI devices
39 The ATAPI/CAM module allows ATAPI devices (CD-ROM, CD-RW, DVD drives,
40 floppy drives such as Iomega Zip, tape drives) to be accessed through
47 must be configured in the kernel as well.
48 The SCSI target drivers
53 can then be used to access the devices.
54 The generic passthrough device,
56 can also be used to send SCSI commands directly
57 to the devices through the CAM API.
59 A separate CAM bus is created for each ATA bus in the system.
60 On each of these buses, target ID 0 is assigned to the master
61 device, and ID 1 is assigned to the slave
62 (provided they are ATAPI devices).
63 .Sh IMPLEMENTATION NOTES
64 Some SCSI commands are intercepted by the driver, and undergo special
65 processing in order to work around limitations of ATAPI devices.
66 Such limitations can be consequences of the ATAPI specification.
67 For example, ATAPI devices do not implement the 6-byte versions
69 .Dv MODE_SELECT , MODE_SENSE , READ ,
72 They can also be common bugs, such as hanging when queried for
77 .Bd -literal -offset indent
88 .Dl "camcontrol devlist"
90 Print the list of all devices available through CAM.
92 .Dl "mount -t cd9660 /dev/cd0c /mnt"
94 Mount a CD-ROM from an ATAPI CD-ROM drive
95 (the command above assumes that the ATAPI drive is the only CD-ROM unit).
103 The ATAPI/CAM driver first appeared in
108 The ATAPI/CAM driver was written by
109 .An Thomas Quinot Aq thomas@FreeBSD.org .
112 and ATAPI-specific target drivers
117 can be configured in the same kernel.
118 Simultaneous access to the same device through the SCSI generic drivers
119 and the ATAPI-specific drivers may cause problems and is strongly discouraged.