RE: udev and parallel port support

["Jason Dravet" <dravet@calumet.purdue.edu>]

> -----Original Message-----
> From: Kay Sievers [mailto:kay.sievers@vrfy.org]
> Sent: Tuesday, October 04, 2005 4:58 PM
> To: Jason Dravet
> Cc: 'Greg KH'; linux-hotplug-devel@lists.sourceforge.net
> Subject: Re: udev and parallel port support
> 
> 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

Thank you for the response.  I realize that some devices need static nodes,
but I am wondering why parallel ports fall into this category at least they
do according to redhat anyways?

Thanks,

Jason



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