Re: udev and parallel port support

[Kay Sievers <kay.sievers@vrfy.org>]

On Tue, Oct 04, 2005 at 04:48:43PM -0500, Jason Dravet wrote:
> > -----Original Message-----
> > From: Greg KH [mailto:greg@kroah.com]
> > Sent: Tuesday, October 04, 2005 4:31 PM
> > To: Jason Dravet
> > Cc: linux-hotplug-devel@lists.sourceforge.net
> > Subject: Re: udev and parallel port support
> > 
> > On Mon, Oct 03, 2005 at 12:24:24PM -0500, Jason Dravet wrote:
> > > Hello,
> > >
> > > I opened bugzilla bug 145148
> > > (https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id\x145148) at the
> > > beginning of this year.  Udev was creating a bunch of unnecessary items
> > in
> > > /dev.  The parallel ports were mentioned specifically along with a large
> > > number of ttyS and tty nodes.  When redhat responded to the bug I found
> > out
> > > that udev had to create the parallel port nodes itself using a rule
> > because
> > > the parallel port module was not loading at boot time.  I opened the bug
> > to
> > > get the parallel port module to load at boot time so udev could
> > dynamically
> > > create the nodes instead of creating 4 parallel ports when most people
> > have
> > > (use) one.
> > >
> > > I received an email asking me to try the new fedora core 4 kernel.  I
> > have
> > > installed it and it works fine for me.  The issue is udev is still
> > creating
> > > the parallel port statically instead of dynamically.  When will udev be
> > able
> > > to dynamically create the nodes for parallel ports?
> > 
> > It does so today just fine, the last time I looked.  It's a kernel
> > issue, not a udev issue.
> > 
> > How could udev be creating devices "statically"?  It's up to the kernel
> > to export what it has availble, and right now, it just exports them all.
> > Is that what bothers you?  If so, feel free to change the kernel code to
> > work better if you wish.
> > 
> > But again, it's a kernel issue, not a udev issue.
> > 
> > thanks,
> > 
> > greg k-h
> 
> I am sorry I did not make my self clear.  What I meant is that udev creates
> the /dev/lp0, /dev/parport0, /dev/lp1, ..., /dev/parport3 nodes by looking
> at /etc/udev/makedev.d/50-udev.nodes instead of actually detecting the
> ports.  In the 50-udev.nodes file it says "These device have to be created
> manually" and proceeds to list several items include lp0.  At least that is
> what happens in version 0.58.  Does it make sense now?

/etc/udev/makedev.d/ exists only on Red Hat. Every distro has it's own
way to create the "static" nodes.

Kay


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