*BSD News Article 74787


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From: tom@tomqnx.tomqnx.com (Tom Torrance at home)
Subject: Re: atapi cdrom problems
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Date: Fri, 26 Jul 1996 02:54:59 GMT
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I occasionally have the problem that you mentioned with the controller
not being recognised.

There is no device wcd0.  do a 'MAKEDEV wcd0'. This will create
wcd0a and wcd0c. Use wcd0c in your mount command.

Rob van Vliet (rvv@iaehv.nl) wrote:
: I have a 6x speed atapi cd-rom, of which i don't have much
: documentation. It identifies itself as "Stingray". It is jumpered as
: master on the second IDE controller, with no other drives on the
: controller. The first ide controller (wdc0) has two IDE drives attached
: to it.

: I recompiled the kernel refelecting the above configuration, however, at
: startup the kernel does, while probing for the second IDE controller
: (wdc1), not recognize it, and says "wdc1: not found at etc...".

: I tried everything, but it wouldn't work. So I installed 2.1.5-RELEASE,
: which is supposed to be better at recognizing ATAPI cd-roms. No good.

: I ended up hacking wd.c in the kernel source, making it not probe for
: the wdc1 controller, but just assume that it is there. This works... for
: a while. At least the cdrom gets recognized as wcd0..

: Now I can mount wcd0: when I mount it, you can hear the cd starting to
: turn, and I can read from it. However, after some time, say one minute,
: the CD stops turning, and from that moment on  I cannot read any longer
: from the CD. Operations like ls return "ls: input/output error" or
: something similar. Sometimes I can umount the CD and then mount it
: again, however on other occasions the system replies "wdc1: controller
: not ready/busy" (again: or something similar), and eventually crashes.
: Yes,
: the system reboots.

: It all seems to have something to do with the physical turning of the CD
: inside the drive. Mount starts this, but other fileoperations don't.

: If you have any solutions to this I will consider you a read ATAPI
: genius, which I hope you are :)

: Please email me or post here if you have any ideas (or think you have,
: but 
: want more info).

: Rob
: -- 
: -------------------------------------------------------------
: Rob van Vliet              E-Mail:               rvv@IAEhv.nl
: -------------------------------------------------------------