UDEV Primer for 2.6 Kernel

charlieg · Posted: Mon Feb 02, 2004 2:07 am Post subject:

It might be worth noting that I had to do the following to get X to work:

Clapper · Apprentice Joined: 29 Sep 2003 Posts: 177

I installed 2.6.1, and it worked with minimal fuss with, I am assuming devfs.

However, my scanner isn't working. Is this udev setup necessary to use my scanner? Or, is implementing this not really a part of my problem?

Clapper · Apprentice Joined: 29 Sep 2003 Posts: 177

Decibels · Veteran Joined: 16 Aug 2002 Posts: 1598 Location: U.S.A.

Clapper · Apprentice Joined: 29 Sep 2003 Posts: 177

In the 2.6 kernel, there is an option for creating the scanner module- I didn't choose it, because the note said something like it had been "deprecated". Anyway, checking this option made the scanner work for me, but I am still in the dark as to how the kernel developers feel this should work, if you don't include the module. I'll check out the previous poster's link...

d3c3it · Posted: Tue Feb 03, 2004 2:00 pm Post subject:

Decibels · Veteran Joined: 16 Aug 2002 Posts: 1598 Location: U.S.A.

I've wondered about that myself, but haven't tested it. Don't believe that you have to add devfs=mount anymore to bootloader to make it load if in the kernel, but I still have it.

Don't know about the nomount option though, haven't tested it. The most reasonable default would seem to be, load it if in kernel unless told not to.

Hmm, guess I need sleep. Was thinking for a moment that devfsd might be in 'rc-update show' but isn't. That is a good question. I would just try the 'nomount' option first.
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d3c3it · Posted: Tue Feb 03, 2004 8:32 pm Post subject:

well for future readers, that option does work, but more importantly i just recompiled completly without devfsd at all, udev mounted everything at boot and bingo everything works, no problems with dri permissions, alsa, everything works, bar printer, but thats my fault. Thanks for that fanastic guide it works a treat.

the last time i tried udev was in dec and it was completly broken for me now it worked first time, i have to give it to the devs on that project hats off to them

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charlieg · Posted: Wed Feb 04, 2004 3:23 pm Post subject:

In the primer tutorial, shouldn't this:

Decibels · Veteran Joined: 16 Aug 2002 Posts: 1598 Location: U.S.A.

Probably whatever works for you. Mine always gets set to user for some reason.
Right now nvidia devices are owned by me and grp root.

Also, looks like Martin has patched the nvidia-kernel to work better with udev and sysfs:

ferret · n00b Joined: 30 Jul 2003 Posts: 22 Location: Oxford UK

As of kernel 2.6.3-rc1, and Martin's nvidia patches, udev now creates my /dev/nvidia, /dev/nvidiactl and /dev/fb/0 !

Now just /dev/misc/svga left and I have absolutely everything

tatesworld · n00b Joined: 25 Oct 2003 Posts: 67

I followed instructions to word, but on boot I get unable to open initial console, gone back to devfs

does /dev need to be empty first time?
ps I use XFS filesystem

Do you need an initrd to load up at boot time?

Evil Dark Archon · Posted: Thu Feb 19, 2004 10:03 pm Post subject:

i would boot the live cd, chroot to your root partition and the simplest method is to re-emerge baselayout and it will create a set of static nodes that will be used during the initial bootup and then udev will take over.
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Decibels · Veteran Joined: 16 Aug 2002 Posts: 1598 Location: U.S.A.

I rewrote the UDEV Primer to update it and include suggestions. There is still some stuff would like to add. Like now I didn't have any luck with the nvidia drivers and will have to see why.
Depends on what time you checked the Primer. If you printed it out, reprint it. Cause around 12pm CST I put up new stuff. If you did from previous tutorial, you are probably using the devices.tar.bz2 file in the default Gentoo UDEV install. Which is even easier, cause they populate /dev from that file. The new stuff in the primer tells you how to edit the baselayout scripts to run a pure udev system and not use the devices.tar.bz2 file.

Another thing is that some people, including me, have at one time not been able to open an initial console during boot on a new system. What I did at that time was:
mknod -m 660 /dev/console c 5 1
mknod -m 660 /dev/null c 1 3

Give me a little more detail on above. Haven't installed a brand new system in quite awhile. Would like to know success or failure rate. Probably going to have to take time to install a new system and see what happens for udev on a new install.

Haven't figured out why yet, but then worked from then on.

Also, like mentioned about the baselayout. Did you make sure you etc-update and put the new scripts in place?
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jimmybfan · Posted: Fri Feb 20, 2004 12:45 am Post subject:

When trying to acces Decibels udev primer i get timeout errors. wondering if anyone else is getting this or if it is just temporary. I was hoping to get udev going today, looks like i might have to wait a little while though.

Decibels · Veteran Joined: 16 Aug 2002 Posts: 1598 Location: U.S.A.

I guess Charter is doing maintenance on the servers. Cause I have some updates to put up and can't, also can't access the webpage from browser.

Sorry, out of my hands. Hopefully will be up shortly.

I would have my own server, but that cost money. So have to rely on them.
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jimmybfan · Posted: Fri Feb 20, 2004 1:08 am Post subject:

I figured as much, but wanted to check. Thanks for the quick reply.

Decibels · Veteran Joined: 16 Aug 2002 Posts: 1598 Location: U.S.A.

Well, even tried to find it cached on google or yahoo, and they have lot of the pages, but not udev. :cry:

Hey, it's back up!! Give it a few minutes for me to get the updates there.
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CaribbeanKnight · Posted: Fri Feb 20, 2004 1:13 am Post subject:

hmmmm, damn... hey Decibels, if you want to put your page on my server temporarily, you can always contact me on caribbeanknight@jabber.org or msn on eme@skynet.be...
just saying this as i'm really bored and sitting in front of my pc eager to get some udev messing going on... :lol:

Decibels · Veteran Joined: 16 Aug 2002 Posts: 1598 Location: U.S.A.

Thanks, but it is rarely down. Plus, the only reason this is noticeable is because this Primer has been a real hit. It's like I wrote a best seller. Hey, I'm a big time author. :lol:

Normally, I wouldn't be even notice or have others tell me about it. So if continues to be a problem I might take you up on it.

I even found a reference to it on google from some mailing list while looking for a cached page of it.
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tatesworld · n00b Joined: 25 Oct 2003 Posts: 67

bingo, thanks got it working , you do need /dev/console & /dev/null

here is what i did

boot of a rescue cd
chroot into root partition
cd dev
rm -r -f *
mknod -m 660 /dev/console c 5 1
mknod -m 660 /dev/null c 1 3
reboot into gentoo
re installed nvidia becouse that devices were not there, I used the NVIDIA-Linux-x86-1.0-5336-pkg1.run from nvidia.com
you will need kernel sources to make the nvidia kernel module driver.

jimmybfan · Posted: Fri Feb 20, 2004 6:19 pm Post subject:

Decibles, thanks for the guide, I got udev up and working. udev only, no devices.tar.bz2. seems to be working without problems. I didn't have to create the nvidia stuff, so I don't know whats going on with that, but it's working, so thats cool.

Decibels · Veteran Joined: 16 Aug 2002 Posts: 1598 Location: U.S.A.

Nvidia devices. The new ebuild is working, just can't have the old one in there also, probably only a problem if using CONFIG_PROTECT to protect /lib/modules. Got it working now.

Console and Null. Figured out why. Posting fix here: https://forums.gentoo.org/viewtopic.php?p=884721#884721

Will update the primer tonight.
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tatesworld · n00b Joined: 25 Oct 2003 Posts: 67

Mine not a New Install

I still had to create console & null from previously using devfs.

I always had to put support for devfs and auto mount at boot ticked in kernel config to boot before.

Decibels · Veteran Joined: 16 Aug 2002 Posts: 1598 Location: U.S.A.

Strange and getting stranger all the time. So, not totally clear on why or when it happens yet, but fix works if encounter the error.

But if you just changed over, then /dev should have been full of static devices (including console and null), so should have worked. !?!
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Support bacteria – they’re the only culture some people have.”

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