ide-cd driver and ATAPI-IDE CDROM

ide-cd driver and ATAPI-IDE CDROM

Post by Maureen Lecuo » Sat, 08 Jul 1995 04:00:00


I have a TEAC 2X ATAPI IDE CDROM installed on an IBM 755CD Thinkpad.

When I boot my system I often see the following:

hdc: media changed
hdc: status error: status=0x59
hdc: status error: error=0x64
ide1: do_ide_reset: success

Also, when I do an ls -ax I don't seem to get all the data read
properly, only some of the files under a directory will show at
times, but I cannot reproduce the problem with any consistency,
because a second or third invocation of the same command
seems to work fine.

I don't see any error messages, and /var/adm/messages indicates
that the cdrom is accurately identified upon boot:

Jul  7 10:12:52 darkstar kernel: ftape: allocated 3 buffers aligned at: 001e8000
Jul  7 10:12:52 darkstar kernel: hda: DVAA-2810, 773MB w/32KB Cache, LBA, CHS=78
5/32/63, MaxMult=16
Jul  7 10:12:52 darkstar kernel: hdc: DC4-E0, ATAPI, CDROM drive
Jul  7 10:12:52 darkstar kernel: ide1: secondary interface on irq 15
Jul  7 10:12:52 darkstar kernel: ide0: primary interface on irq 14

If anyone is familiar with this problem or has any ideas, please let
me know...

Maureen Lecuona

|| maureen  || For this world that men have made, none of us is bad enough.
||          || For the world that made us, none is good enough.    -Edward Abbey
|| lecuona  || Those who dream of the joys of living in a space colony should
||          || live in a space colony.                             -Edward Abbey  


1. New IDE-CD/extended IDE driver supports Sony 55E ATAPI CD-ROM!

I'm now successfully using my Sony CDU-55E CDROM drive (an ATAPI drive)
from Linux.  I'm using 1.1.75 plus the ide/ide-cd patch by Mike Lord and
Scott Snyder.  I understand that this code is now part of 1.1.76.  Cool!
This means that just about all my stuff is now supported by "standard Linux".

There are some rough edges.  As mentioned in the README.ide file in
/usr/src/linux/drivers/block, the mount command for the cdrom must be
just right; if a block size other than 2048 is used (or block size
isn't specified, weird errors result).  I initially thought this meant
it didn't quite work.  However, given the exact commands mentioned in

        ln -sf /dev/hdc /dev/cdrom
        mkdir /cd
        mount /dev/cdrom /cd -t iso9660 -o ro,block=2048

I am now successfully reading CDROMs.

Some folks mentioned that they got the older NEC-260 driver to work
provided they'd booted DOS first and used LOADLIN; I'm booting from
LILO and everything works fine.

Note that this drive isn't mentioned in the README.ide file.  Anyone
documenting this, please add the Sony 55E to the list of drives it
works with.

Thanks to all who sent me mail, and especially to Scott Snyder for writing
ide-cd.c !


Phone: +1 415 694 1729

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