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SubjectRe: [IDE] trying to make MO drive work with ide-floppy/ide-cd
On 6 May 2003, Alan Cox wrote:

> I'm not aware of any plans to make ide-floppy handle that disk, or reasons
> you would want to use ide floppy in 2.5 not the ide-cd layer (which does
> now handle writable devices I believe).

Okay, didn't think of that, so I now tried using ide-cd for the MO drive
(2.5.68+bkcvs). I still had to patch ide-probe.c, just passing "hde=cdrom"
did not do what I wanted. ;)
Now I get the following at bootup:

hde: FUJITSU MCC3064AP, ATAPI OPTICAL drive
hde: set_drive_speed_status: status=0x51 { DriveReady SeekComplete Error }
hde: set_drive_speed_status: error=0x04
Uniform CD-ROM driver Revision: 3.12
end_request: I/O error, dev hde, sector 0
hde: packet command error: status=0x51 { DriveReady SeekComplete Error }
hde: packet command error: error=0x50
end_request: I/O error, dev hde, sector 0
ATAPI device hde:
Error: Illegal request -- (Sense key=0x05)
Invalid field in command packet -- (asc=0x24, ascq=0x00)
The failed "Mode Sense 10" packet command was:
"5a 00 2a 00 00 00 00 00 18 00 00 00 00 00 00 00 "
Error in command data byte 8800
hde: packet command error: status=0x51 { DriveReady SeekComplete Error }
hde: packet command error: error=0x50
end_request: I/O error, dev hde, sector 0
ATAPI device hde:
Error: Illegal request -- (Sense key=0x05)
Invalid field in command packet -- (asc=0x24, ascq=0x00)
The failed "Mode Sense 10" packet command was:
"5a 00 2a 00 00 00 00 00 18 00 00 00 00 00 00 00 "
Error in command data byte 8800
end_request: I/O error, dev hde, sector 0
This doesn't look encouraging. However, the MO drive sort of works:

# mount -t ext2 /dev/hde /mnt/mo
mount: block device /dev/hde is write-protected, mounting read-only

The disk gets mounted and reading works just fine. No write support,
though. To reiterate, everything works under 2.4 using ide-scsi.

What can I do to help get this drive supported under 2.5/ide-cd?

I'll check if reading from the MO drive works with ide-cd under 2.4
as well. If it does: what about a patch that makes ATAPI MO drives
and CD writers behave the same on 2.4: read-only with native ide drivers,
read-write with ide-scsi?

--- linux-2.5/drivers/ide/ide-probe.c Sat Apr 26 18:49:57 2003
+++ build25/drivers/ide/ide-probe.c Tue May 6 15:42:40 2003
@@ -221,6 +221,7 @@ static inline void do_identify (ide_driv
break;
case ide_optical:
printk ("OPTICAL");
+ type = ide_cdrom;
drive->removable = 1;
break;
default:
--
Ciao,
Pascal

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