cdrom devices missing

cdrom devices missing

[Sam Liddicott]

udev makes my hard disk nodes device and partition nodes OK, but does 
not create my cdrom device nodes at all.

I have a debian testing/unstable install that is a de-mepis-ized 
latest-MEPIS installation.

I have debian udev_0.050 build from source (apt-get -b source)

My cdrom is on hdc, I even tried adding to rules.d

KERNEL="hdc" SYMLINK="dvd cdrom dvdrecorder cdrecorder"

but no joy

If I make device nodes by hand then mplayer et al work fine.


I had similar problems with my sound card until I listed my sound card 
driver explicitly in /etc/modules - is this the correct procedure for 
all hardware support with udev? I expected hotplug/udev to "discover" 
the soundcard hardware and do all the right tricks with it like it does 
for removable device, perhaps I am wrong?

However as the kernel already recognizes my cdrom and manually making 
the device nodes is enough for things to work I can't see that adding 
anything to /etc/modules would work here.

Sam



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Re: cdrom devices missing

[Stefan Schweizer]

These are problems, that happen when not all udev.rules files for all
distributions are updated. We even use different ways to solve the
same problems ..
It is made at the beginning of the gentoo rules file:

# cdrom symlinks and other good cdrom naming
BUS="ide",  KERNEL="hd[a-z]", 
PROGRAM="/etc/udev/scripts/cdsymlinks.sh %k", SYMLINK="%c{1} %c{2}
%c{3} %c{4} %c{5} %c{6}"
BUS="scsi", KERNEL="sr[0-9]*", 
PROGRAM="/etc/udev/scripts/cdsymlinks.sh %k", SYMLINK="%c{1} %c{2}
%c{3} %c{4} %c{5} %c{6}"
BUS="scsi", KERNEL="scd[a-z]",
PROGRAM="/etc/udev/scripts/cdsymlinks.sh %k", SYMLINK="%c{1} %c{2}
%c{3} %c{4} %c{5} %c{6}"

# devfs-names for ide-devices (uncomment only one)
#  /dev/ide/.../{disc,cd} and /dev/{cdroms,discs}/* type names
BUS="ide", KERNEL="hd*", PROGRAM="/etc/udev/scripts/ide-devfs.sh %k %b
%n", NAME="%k", SYMLINK="%c{1} %c{2}"

Maybe you could just try to use the gentoo rules file? (make sure you
have the necessary scripts)
or change your rules similar to the above one.

Kind regards,
Stefan


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Re: cdrom devices missing

[Kay Sievers]

On Mon, 2005-01-03 at 12:31 +0000, Sam Liddicott wrote:
> udev makes my hard disk nodes device and partition nodes OK, but does 
> not create my cdrom device nodes at all.

Does running udevstart create the device node, instead of creating it
manually? Is ide-cd loaded, before your system runs udevstart?

Kay



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Re: cdrom devices missing

[Sam Liddicott]

Kay Sievers wrote:
> On Mon, 2005-01-03 at 12:31 +0000, Sam Liddicott wrote:
> 
>>udev makes my hard disk nodes device and partition nodes OK, but does 
>>not create my cdrom device nodes at all.
> 
> 
> Does running udevstart create the device node, instead of creating it
> manually? Is ide-cd loaded, before your system runs udevstart?

modprobe ide-cd

makes it work. Thankyou.

This is now added to my /etc/modules

I did:
find /lib/modules* -name 'cd*'
before, but now I see why this didn't work.

To complete my education, what is it that I no longer have that would 
have loaded all these modules before?

Was it something that loaded the module whgen I access the device node, 
or was it just something that loaded the modules anyway?

Thanks Kay and also Stefan

Sam


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Re: cdrom devices missing

[Kay Sievers]

On Mon, 2005-01-03 at 16:49 +0000, Sam Liddicott wrote:
> Kay Sievers wrote:
> > On Mon, 2005-01-03 at 12:31 +0000, Sam Liddicott wrote:
> > 
> >>udev makes my hard disk nodes device and partition nodes OK, but does 
> >>not create my cdrom device nodes at all.
> > 
> > 
> > Does running udevstart create the device node, instead of creating it
> > manually? Is ide-cd loaded, before your system runs udevstart?

> Was it something that loaded the module whgen I access the device node, 
> or was it just something that loaded the modules anyway?

Greg explains that here:
  http://www.kroah.com/log/linux/kmod_part1.html

Kay



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