DVD-ROM drive won't mount unless DMA is turned off!? HELP!!

TheMasterRat · n00b Joined: 21 Apr 2003 Posts: 14 Location: Tucson, AZ

Ok, I've been working on this all day. I'm fried. I need more input.

If I try the following :
mount -t iso9660 /dev/cdrom /mnt/dvdrom
It reports the following :
mount: Not a directory

It does *not* matter what the mount point is..

If I run :
hdparm -d0 /dev/cdrom

I can mount the drive successfully..

PLEASE let me know if you have any ideas. Thx...

System Configuration information :
AMD 1200MHz T-Bird
512MB RAM
Soyo K7V Dragon+ ( Via KT266a chipset w/on board Promise 20265 Controller )

Drive arrangement :
Primary IDE :
Master : 60GB HD ( /dev/hda1 - /dev/hda3 )
Slave : 80GB HD ( /dev/hdb1, hdb5, hdb6 <- Leftovers I haven't worked on yet )
Secondary IDE :
Master : Pioneer A05 DVD-RW ( /dev/sg0, /dev/sr0, /dev/cdroms/cdrom1 )
Slave : Lite-on 32x12x40x CD-RW ( /dev/sg1, /dev/sr1, /dev/cdroms/cdrom2 )

Promise controller ( Setup for regular IDE usage )
Primary :
Master : Pioneer DVD-ROM Slot Load ( I forget the model # ) ( /dev/cdrom, /dev/cdroms/cdrom0 )
Slave : None
Secondary : No drives

Kernel Configuration :

─────────────────── IDE, ATA and ATAPI Block devices ────────────────────┐
<*> Enhanced IDE/MFM/RLL disk/cdrom/tape/floppy support
<*> Include IDE/ATA-2 DISK support
[*] Use multi-mode by default
<*> Include IDE/ATAPI CDROM support
<*> SCSI emulation support
[*] Generic PCI IDE chipset support
[*] Sharing PCI IDE interrupts support
[*] Generic PCI bus-master DMA support
[*] Use PCI DMA by default when available
[*] Intel PIIXn chipsets support
[*] PIIXn Tuning support
[*] PROMISE PDC202{46|62|65|67|68|69|70} support
[*] Special UDMA Feature

─────────────────────────── SCSI support ──────────────────────────────┐
<*> SCSI support
<*> SCSI disk support
(40) Maximum number of SCSI disks that can be loaded as modules
<*> SCSI CD-ROM support
(2) Maximum number of CDROM devices that can be loaded as modules
<*> SCSI generic support
[*] Probe all LUNs on each SCSI device
[*] Verbose SCSI error reporting (kernel size +=12K)

─────────────────────────── LILO.CONF ──────────────────────────────┐
image=/boot/bzImage
label=linux
read-only
root=/dev/hda3
append="hdc=ide-scsi hdd=ide-scsi"

FantasMic · Posted: Fri Sep 19, 2003 7:06 am Post subject:

hdparm hdx won't work if your cd-rom drive is handled by the ide-scsi emulation layer.
try diasbling the ide cd-rom driver (you won't need it at all if you use scsi emulation).
Then check /proc/ide/hdc/settings and echo "using_dma:1" if needed. scsi-emulated cd-rom drives have to be configured here.
Those changes may clean up some chaotics in the system, if they don't help, try replacing the ide-cable, updating your BIOS and updating your dvd-drive firmware (this may be hard, flash software often wants windoze).
Another idea is to try another kernel, maybe some 2.4.22?

TheMasterRat · n00b Joined: 21 Apr 2003 Posts: 14 Location: Tucson, AZ

-dual post-

TheMasterRat · n00b Joined: 21 Apr 2003 Posts: 14 Location: Tucson, AZ

I'm not using IDE-SCSI emulation for the DVD-ROM drive, nor did I plan to. I may set it up that way just to test, but other than that, it's only used for the CDRW and DVDRW.

HDC and HDD no longer show up under /dev because they are no sg0 and sg1 respectively.

cripwalk · n00b Joined: 13 Jul 2003 Posts: 59 Location: Socal

You should make sure you have UDF file system in you kernel if your going to be mounting dvd's.

TheMasterRat · n00b Joined: 21 Apr 2003 Posts: 14 Location: Tucson, AZ

TheMasterRat · n00b Joined: 21 Apr 2003 Posts: 14 Location: Tucson, AZ

-TTT-

Still looking for a workaround...

Since enabling DMA does not seem to be an option on SCSI-emulated drives, should I enable the DVD-ROM drive as ide-scsi and see if that works (performance wise)?

cripwalk · n00b Joined: 13 Jul 2003 Posts: 59 Location: Socal