[Xen-users] Re: Live Demo CD boots but then can't find CDROM?

[Arp <moin.askthem@xxxxxxxxx>]

Update/Correction

I wrote:
> I'm pretty sure it's a (machine specific??) aic7xxx based problem...

Hmmm, not so sure anymore - had a closer look and it seems aic7xxx
initializes correctly and the CDROM drive is recognized at the
SCSI-level.

contents of /proc/scsi :
---------------------------------------------------------------------------------------
Attached devices:
Host: scsi0 Channel: 00 Id: 00 Lun: 00
  Vendor: DEC      Model: RZ2DC-PA (C) DEC Rev: 5520
  Type:   Direct-Access                    ANSI SCSI revision: 02
<snip 2nd and 3rd hdd>
Host: scsi0 Channel: 00 Id: 05 Lun: 00
  Vendor: TOSHIBA  Model: CD-ROM XM-6201TA Rev: 1206
  Type:   CD-ROM                           ANSI SCSI revision: 02
---------------------------------------------------------------------------------------

Also, dmesg gives me:
---------------------------------------------------------------------------------------
<snip>
SCSI subsystem initialized
PCI: Obtained IRQ 11 for device 0000:00:0c.0
scsi0 : Adaptec AIC7XXX EISA/VLB/PCI SCSI HBA DRIVER, Rev 6.2.36
        <Adaptec aic7880 Ultra SCSI adapter>
        aic7880: Ultra Wide Channel A, SCSI Id=7, 16/253 SCBs

(scsi0:A:0): 40.000MB/s transfers (20.000MHz, offset 8, 16bit)
  Vendor: DEC       Model: RZ2DC-PA (C) DEC  Rev: 5520
  Type:   Direct-Access                      ANSI SCSI revision: 02
scsi0:A:0:0: Tagged Queuing enabled.  Depth 8
(scsi0:A:1): 40.000MB/s transfers (20.000MHz, offset 8, 16bit)
  Vendor: DEC       Model: RZ2DC-PA (C) DEC  Rev: 5520
  Type:   Direct-Access                      ANSI SCSI revision: 02
scsi0:A:1:0: Tagged Queuing enabled.  Depth 8
(scsi0:A:2): 40.000MB/s transfers (20.000MHz, offset 8, 16bit)
  Vendor: DEC       Model: RZ2DC-PA (C) DEC  Rev: 5520
  Type:   Direct-Access                      ANSI SCSI revision: 02
scsi0:A:2:0: Tagged Queuing enabled.  Depth 8
(scsi0:A:5): 10.000MB/s transfers (10.000MHz, offset 15)
  Vendor: TOSHIBA   Model: CD-ROM XM-6201TA  Rev: 1206
  Type:   CD-ROM                             ANSI SCSI revision: 02
<snip>
---------------------------------------------------------------------------------------

Not sure if this is relevant but note that for the CD-ROM no
final line is generated such as:
"scsi0:A:#:0: Tagged Queuing enabled.  Depth #"
(but that maybe only means the drive doesn't do Tagged Queuing??)

The very last lines of dmesg are
---------------------------------------------------------------------------------------
<snip>
SCSI device sda: 17773524 512-byte hdwr sectors (9100 MB)
SCSI device sda: drive cache: write through
SCSI device sda: 17773524 512-byte hdwr sectors (9100 MB)
SCSI device sda: drive cache: write through
 /dev/scsi/host0/bus0/target0/lun0: p1
Attached scsi disk sda at scsi0, channel 0, id 0, lun 0
<... snip same for hdd2&3 ...>
 /dev/scsi/host0/bus0/target2/lun0: unknown partition table
Attached scsi disk sdc at scsi0, channel 0, id 2, lun 0
---------------------------------------------------------------------------------------

( so nothing there for the CD at scsi0, channel 0, id 5, lun 0 )

After that the intallation breaks with:
"Mounting CD-ROM"
"mount: Mounting /dev/cdroms/cdrom0 on /tmp/cdrom failed: No such file
or directory"
" "
"Can't find the root FS on the CD-ROM, sorry. Looks like we're stuck."
....

from the shell I can then see that no  /dev/cdroms  has been created
( so obviously mount can't find /cdroms/cdrom0 )
Also,  /dev/scsi  only has:
/dev/scsi/host0/bus0
---------------------------------------------------------------------------------------
drwxr-xr-x    1 0        0               0 Jan  1  1970 .
drwxr-xr-x    1 0        0               0 Jan  1  1970 ..
drwxr-xr-x    1 0        0               0 Jan  1  1970 target0
drwxr-xr-x    1 0        0               0 Jan  1  1970 target1
drwxr-xr-x    1 0        0               0 Jan  1  1970 target2
---------------------------------------------------------------------------------------
So no entry for target5 (=CD-ROM) there either

The drive identifies as:              TOSHIBA  model CD-ROM XM-6201TA  Rev: 1206
/proc/device_info has a line for: 'TOSHIBA'  'CD-ROM'  0x100
so that's not the problem either
( and as stated in OP same happens for a TEAC CD-R55S )

Strangely, I can't seem to find a 'floppy'  device either in /dev
How is that supposed to show up anyway? As /dev/floppy or /dev/fd0 or what?
Or doesn't the demo bother to install a floppy?
Or is that an issue with the boot-CD taking over the BIOS floppy handle?

So, somehow at the controller level (aic7xxx) the drive is recognized ...
... but alas, I still don't understand why the CD doesn't show up.

I clearly haven't played with linux/unix enough in the past 10 years or so :o(

Any hints would be most welcome still... thanks!
--
Arp

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