Re: cdu31a - anyone has this ancient drive for testing?
From: Rene Herman
Date: Sun Nov 07 2004 - 14:57:43 EST
Ondrej Zary wrote:
I've got a Sony CDU33A drive with COR334 controller. The Linux cdu31a
driver was not updated for 2.6 kernel so it does not work.
Well, modular it still /pretended/ to work. That is, it could (most of
the time) mount CD-ROMs but yes, most any actual activity made it blow up...
Here are two patches that try to make the driver working with 2.6
kernel. The cdu31a-timeouts-fix.patch fixes the timeout values in header
file and the cdu31a-make-working.patch does the rest:
- Make the driver work in 2.6.X
- Added workaround to fix hard lockups on eject
- Fixed door locking problem after mounting empty drive
- Set double-speed drives to double speed by default
- Removed all readahead things - not needed anymore
It does work on my system. I also know that it's still broken - it uses
cli(), MODULE_PARM and it's also not very fast (I _never_ reached full
300KB/s with it, but I know that it's possible in Windows) and probably
many other things (I'm new to Linux kernel) - so I'm waiting for comments.
If someone has these ancient drives (CDU31A or CDU33A), please test :-)
Verified to do useful things here as well. I Have a CDU33A connected
through a MediaVision PAS16 soundcard:
Pro Audio Spectrum driver Copyright (C) by Hannu Savolainen 1993-1996
<Pro AudioSpectrum 16D rev 127> at 0x388 irq 10 dma 5
Leaving handle_sony_cd_attention at 1004
Sony I/F CDROM : SONY CD-ROM CDU33A Rev 1.0c
Capabilities: tray, audio, eject, LED, elec. Vol, sep. Vol, double speed
Entering sony_get_toc
[ a great many leaving/entering and other debug printks ]
and I could actually mount CD-ROMs and copy stuff from them. One thing,
a full 'dd' does not work:
root@5vd5:~# dd if=/dev/sonycd of=test.iso
0+0 records in
0+0 records out
root@5vd5:~# ls -l test.iso
-rw-r--r-- 1 root root 0 2004-11-07 20:41 test.iso
no oopses, nor specific complaints in dmesg.
Good job though, as far as I'm concerned. Once you have a final version,
you may want to submit this directly to Linus or maybe to Al Viro. He
sometimes looks at these drivers. I added him to the CC...
Rene.
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