Re: how to use udev

[Greg KH <greg@kroah.com>]

On Sat, Jan 03, 2004 at 05:54:24AM +0000, Roman Duka wrote:
> 
> No Greg I don't get anything in /udev the script calls udev and there 
> are no error messages or anything, however /udev is still empty I need 
> to ask you a few questions:

Ick.  You ran that as root, right?

Hm, try running the udev-test.pl script in that directory.  Let us know
if the tests there pass or not.  They should.

> - I compiled udev on Linux running kenel 2.4.20, however I am trying to 
> get udev working on kernel 2.6.0 which has support for hot-pluggable 
> devices and module loading/unloading enabled. I don't think I need to be 
> running kernel 2.6.0 in order to just compile udev, am I correct here??

You are correct.  You can build udev on any kernel.  _but_ the test.all
script will _not_ show anything in /udev if you are not on a 2.6.0
kernel.  That's probably the problem.

The udev-test.pl script will work on any kernel, it uses its own fake
sysfs tree.

> - I didn't switch my system to kernel 2.6.0 and udev, I am trying to 
> test it within initrd (Initial Ram Disk), so what I have is a 
> subdirectory in my home directory, where I installed busybox, bash, 
> insmod, modprobe, hotplug scripts and udev, plus the needed shared 
> libraries in /lib. Note I installed udev with the following command 
> "make DESTDIR=mydir install" i.e. I didn't use "prefix" so all the 
> config files etc should be relative to the root directory, and I've 
> checked them, they're fine. I created a initrd and put it on a CD-RW 
> disk and that's what I am booting from and testing udev. My question is, 
> does running udev withing initrd make any impact on its operations?

It shouldn't.  You built the klibc version, right?

> May be the reason why it doesn't work for me is because it has some
> issues in initrd environment???

Is sysfs mounted when udev is called?  That's a requirement.

thanks,

greg k-h


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