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28 .\" $FreeBSD: src/share/man/man9/cd.9,v 1.11.2.3 2002/04/15 06:06:40 trhodes Exp $
35 .Nd CDROM driver for the CAM SCSI subsystem
39 device driver provides a read only interface for CDROM drives
45 that support CDROM type commands.
46 Some drives don't behave as the driver expects. See the section
47 QUIRKS for info on possible flags.
51 device can have different interpretations of the
53 spec. This can lead to drives requiring special handling in the driver. The
54 following is a list of quirks that the driver recognize.
55 .Bl -tag -width CD_Q_BCD_TRACKS
57 This flag tell the driver not to probe the drive at attach time to see if
58 there is a disk in the drive and find out what size it is. This flag is
59 currently unimplemented in the CAM
62 .It Dv CD_Q_BCD_TRACKS
63 This flag is for broken drives that return the track numbers in packed BCD
64 instead of straight decimal. If the drive seems to skip tracks
65 (tracks 10-15 are skipped)
66 then you have a drive that is in need of this flag.
67 .It Dv CD_Q_NO_CHANGER
68 This flag tells the driver that the device in question is not a changer.
69 This is only necessary for a CDROM device with multiple luns that are not a
72 This flag tells the driver that the given device is a multi-lun changer.
73 In general, the driver will figure this out automatically when it sees a
74 LUN greater than 0. Setting this flag only has the effect of telling the
75 driver to run the initial read capacity command for LUN 0 of the changer
76 through the changer scheduling code.
79 .Bl -tag -width /sys/bus/cam/scsi/scsi_cd.c -compact
80 .It Pa /sys/bus/cam/scsi/scsi_cd.c
81 is the driver source file.
89 manual page first appeared in
94 manual page was written by
95 .An John-Mark Gurney Aq Mt gurney_j@efn.org .
96 It was updated for CAM and
99 .An Kenneth Merry Aq Mt ken@FreeBSD.org .