Can't access a music CD

[Polytropon]

On Thu, 13 Oct 2011 22:38:45 +0000, Alexander Best wrote:
> On Fri Oct 14 11, Polytropon wrote:
> > % ls /dev/acd0*
> > /dev/acd0     /dev/acd0t04  /dev/acd0t08  /dev/acd0t12  /dev/acd0t16
> > /dev/acd0t01  /dev/acd0t05  /dev/acd0t09  /dev/acd0t13  /dev/acd0t17
> > /dev/acd0t02  /dev/acd0t06  /dev/acd0t10  /dev/acd0t14  /dev/acd0t18
> > /dev/acd0t03  /dev/acd0t07  /dev/acd0t11  /dev/acd0t15  /dev/acd0t19
> 
> otaku% ls|grep cd
> cd0
> cdrom

% dmesg | grep ^acd
acd0: DVDR <HL-DT-ST DVDRAM GSA-H42N/RL00> at ata1-master UDMA66 
acd1: DVDROM <HL-DT-STDVD-ROM GDR8163B/0L30> at ata1-slave UDMA33

Those are parallel ATA drives, accessed by the ATAPI drivers.
Because I can either access them as ATAPI drives as well as
SCSI drives, they show up in both "subsystems":

% atacontrol list
ATA channel 1:
    Master: acd0 <HL-DT-ST DVDRAM GSA-H42N/RL00> ATA/ATAPI revision 7
    Slave:  acd1 <HL-DT-STDVD-ROM GDR8163B/0L30> ATA/ATAPI revision 6

% camcontrol devlist
<HL-DT-ST DVDRAM GSA-H42N RL00>    at scbus0 target 0 lun 0 (pass0,cd0)
<HL-DT-ST DVD-ROM GDR8163B 0L30>   at scbus0 target 1 lun 0 (pass1,cd1)

In the kernel configuration, I have the following relevant
settings:

# ATA and ATAPI devices
device          ata
device          atadisk         # ATA disk drives
device          ataraid         # ATA RAID drives
device          atapicd         # ATAPI CDROM drives
device          atapifd         # ATAPI floppy drives
device          atapist         # ATAPI tape drives
options         ATA_STATIC_ID   # Static device numbering
device          atapicam        # For "SCSI over ATA"

# SCSI peripherals
device          scbus           # SCSI bus (required for SCSI)
device          ch              # SCSI media changers
device          da              # Direct Access (disks)
device          sa              # Sequential Access (tape etc)
device          cd              # CD
device          pass            # Passthrough device (direct SCSI access)
device          ses             # SCSI Environmental Services (and SAF-TE)
options         SCSI_DELAY=100  # Delay (in ms) before probing SCSI [5000]

So I can use both /dev/cd0 and /dev/acd0 to access the same
drive, just are required, e. g. /dev/cd0 (equals /dev/dvd
for consistency with the growisofs manpage) for burning CDs,
and /dev/acd0 for audio playback (when accessed with cdcontrol).

OS is x86 v8.2 STABLE of August 2011 with (obviously) custom
kernel.

If I remember correctly, the cdcontrol utility talks to the
ATAPI "subsystem" which now has been melted somehow with the
ATAPICAM ("SCSI") way of accessing devices...



-- 
Polytropon
Magdeburg, Germany
Happy FreeBSD user since 4.0
Andra moi ennepe, Mousa, ...