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CyCO
n00b
Joined: 15 Apr 2005
Posts: 24
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 Posted: Tue May 10, 2005 10:36 pm Post subject: what is the deal with udev and 2005.0 |
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I have installed 2005.0 and built kernel 2.6.11 using genkernel if I do not include the udev option and reboot my laptop I get the following error
>> Mounting filesystems
mount: Mounting devfs on /dev failed: No such device
Error opening file: ".devfsd" No such file or directory
>> Determining root device...
>> Block device /dev/hda5 is not a valid root device
>> The root block device is unspecified or not detected.
Please specifiy a device to boot, or "shell" for a shell...
boot() ::
The partitions are
/dev/hda1 IBM Thinkpad Hibernation
/dev/hda2 Windows
/dev/hda3 Extended
/dev/hda5 Linux (my /)
/dev/hda6 Linux Swap
/dev/hda7 Linux (my /home)
my grub.conf
default 0
timeout 30
splashimage=(hd0,4)/boot/grub/splash.xpm.gz
title=Gentoo Linux 2.6.11-r3
root (hd0,4)
kernel /boot/kernel-2.6.11-gentoo-r3 root=/dev/ram0 init=/linuxrc ramdisk=8192 real_root=/dev/hda5 video=vesafb:ywrap,mtrr,1024x768-32@60
initrd /boot/initrd-2.6.11-gentoo-r3
title=Gentoo Linux 2.6.11-r3-udev
root (hd0,4)
kernel /boot/kernel-2.6.11-gentoo-r3-udev root=/dev/ram0 init=/linuxrc ramdisk=8192 real_root=/dev/hda5 video=vesafb:ywrap,mtrr,1024x768-32@60
initrd /boot/initrd-2.6.11-gentoo-r3-udev
title=Windoze XP
root (hd0,1)
makeactive
chainloader +1
can someone explain what udev does and why I need it?
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magnesium
Apprentice
Joined: 28 Oct 2003
Posts: 280
Location: Toronto, Canada
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| Posted: Tue May 10, 2005 10:48 pm Post subject: |
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udev populates your /dev device and you need it to use any devices. It's also the default /dev file handler for 2005.0, so you should use it. It's dynamic as long as you use the hotplug kernel option and it rocks.
use it.
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RayDude
Advocate
Joined: 29 May 2004
Posts: 2066
Location: San Jose, CA
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| Posted: Tue May 10, 2005 10:54 pm Post subject: Re: what is the deal with udev and 2005.0 |
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udev replaces the kernel devfs file system. Its better because, among other reasons, its user level instead of kernel level, so its more user friendly.
I have found no specific faqs on how to switch to it. The best and simplest description I have found is BobPs Install stage 1 on a stage 3 tarball.
https://forums.gentoo.org/viewtopic-t-319349.html
However, here's a summary of what I did to get it to work on my machines:
| Code: | | nano -w /etc/conf.d/rc |
| Code: | RC_NET_STRICT_CHECKING="no"
RC_DEVICE_TARBALL="no"
RC_DEVICES="udev" |
The first line is probably already correct. The second line exists, you just change it to "no" and the third line is new, you must add it for udev to work. I put it after the TARBALL statement.
Although it looks like the new version of baselayout may not need this stuff.
Since you have disabled devfs in the kernel, that step is done.
The next thing is to emerge udev:
| Code: | emerge udev hotplug coldplug
rc-update add hotplug default
rc-update add coldplug default |
As far as I know, that's all you need.
I've only had trouble with one system getting it to work.
Good luck,
Raydude
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CyCO
n00b
Joined: 15 Apr 2005
Posts: 24
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| Posted: Wed May 11, 2005 5:10 am Post subject: |
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Thanks for that I will just leave udev in the compile option  |
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RayDude
Advocate
Joined: 29 May 2004
Posts: 2066
Location: San Jose, CA
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| Posted: Wed May 11, 2005 5:13 pm Post subject: |
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| CyCO wrote: | | Thanks for that I will just leave udev in the compile option |
Forgive me for asking, but udev in the compile option for what?
Its not in my kernel...
Do you mean devfs?
If you do mean devfs, it would be a good idea to figure out udev now because at some point devfs will be dropped from the kernel.
Raydude
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Maedhros
Bodhisattva
Joined: 14 Apr 2004
Posts: 5511
Location: Durham, UK
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