udev Status

Apollyon · n00b Joined: 10 Mar 2003 Posts: 22 Location: Spain

Hi,

I may be installing Gentoo on a new machine sometime soon, and I wanted to know what the status of Gentoo's udev support is. Last time I checked (admittedly a while ago, but less than a year) you still needed to compile devfs support in the kernel. Is this still the case?

iverson0881 · Apprentice Joined: 08 Jan 2004 Posts: 285 Location: CA

udev is now supported by the gentoo devs. You can find the guide on it here:
http://www.gentoo.org/doc/en/udev-guide.xml

udev works great here.

Apollyon · n00b Joined: 10 Mar 2003 Posts: 22 Location: Spain

Yes, that guide was around when I tried it too.

I see that it says "You can leave the /dev file system support (OBSOLETE) active if you wish ...". If I remember correctly, the Gentoo bootup scripts used to complained about not having devfs compiled in the kernel, even if you where going to use udev. Is this still the case, or have the scripts been fixed already?

NeddySeagoon · Posted: Sat May 28, 2005 10:34 am Post subject:

Apollyon,

udev Just Works. Get the 2005.0 install.

You can build the kernel to support either devfs or udev and switch back and forth if you need to.
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blue.sca · Posted: Sat May 28, 2005 11:01 am Post subject:

hmm? pure udev works since about a year or so perfectly. devfs is gone on my system forever.
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Apollyon · n00b Joined: 10 Mar 2003 Posts: 22 Location: Spain

Great, my next system will be udev only! Thanks!

daoist · n00b Joined: 14 May 2003 Posts: 28

I have recently (finished 10 minutes ago) installing based on a stage1 tarball from 2005.0. During bootup I get a big scary screen browbeating me because I did not compile my kernel (2.6.11-gentoo-r9) with DEVFS support.

How do I suppress this message? Does it indicate some other problem with my system?

After hitting enter at the scary warning message the system appears to boot successfully.

I apologize if this is off-topic, but after searching this thread appears to be the same issue I'm having; the scary warning message

blue.sca · Posted: Sat May 28, 2005 1:01 pm Post subject:

are you using devfs or udev?
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NeddySeagoon · Posted: Sat May 28, 2005 1:02 pm Post subject:

daoist,

Did you

Maedhros · Posted: Sat May 28, 2005 4:02 pm Post subject:

Moved from Unsupported Software.
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daoist · n00b Joined: 14 May 2003 Posts: 28

blue.sca · Posted: Sun May 29, 2005 10:06 am Post subject:

for the case you didn't already answered this question, what do you want to use? pure udev, udev + devfs or just devfs?
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daoist · n00b Joined: 14 May 2003 Posts: 28

heh, honestly I don't care.

Does udev do the slow autodetection thing like the livecd does? if so, then not only no, but hell no.

if udev can work without making the machine take several minutes to boot, then sure, how about udev.

NeddySeagoon · Posted: Sun May 29, 2005 11:14 am Post subject:

daoist,

No. It uses coldboot if you want, or you can do it manully with entries in /etc/modules.autolaod.d/kern....
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Fat Bastard · n00b Joined: 06 May 2005 Posts: 53

Crispy Beef · Apprentice Joined: 29 Apr 2003 Posts: 194 Location: UK

Just out of interest what are the advantages of using udev over devfs? Is it really worth me switching to udev, if this can be done on a system already installed with devfs?

From what I've read if I did want to switch then all I need to do is compile coldplug (and udev obviously) and add it with rc-update as I already have hotplug installed.

Is there anything else to consider?

Edit: Have since done a proper search and found out a lot of info, but just to be sure I would still like to hear about how easy it is to switch to udev. :-)

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blue.sca · Posted: Mon May 30, 2005 2:36 pm Post subject:

took me about half an hour, without any fiddling with device nodes. look [url=http://webpages.charter.net/decibelshelp/LinuxHelp_UDEVPrimer.html]here[/code], the udev bible ;) should be most up-to-date.
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Crispy Beef · Apprentice Joined: 29 Apr 2003 Posts: 194 Location: UK

Have just done the switch and completely disabled devfs in my kernel, now udev only. The only thing that I had to change was the entry for my mouse in the xorg.conf file. Had to switch it from /dev/mouse to /dev/input/mouse1, everything else seems to work as it did before. USB scanner, bluetooth dongle and printer all seem just fine. :-)

There's two errors on startup which I need to investigate, will check out the link too, cheers.
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daoist · n00b Joined: 14 May 2003 Posts: 28

thanks for all the quick replies. I've emerged udev and hotplug, and now it seem great.

Crispy Beef · Apprentice Joined: 29 Apr 2003 Posts: 194 Location: UK

The error message I get is when coldplug starts up and looks for usb devices. It says something along the lines of: