Re: udev vs. devfs

[Vassilis Virvilis <vasvir@iit.demokritos.gr>]

Pelle Svensson wrote:
> 
> Hi,
> 
[snip]
> Can't somebody tell me what I need to get udev up and running from scratch.
> 
> I'm building a ARM system with 2.6 kernel from scratch so I only need the
> most basic stuff to get a 'dev' list.
> 

Halo,

I don't if it will help you but it mostly works for my setup so you may give it a try.

Assuming you are booting correctly and
0) you have the latest kernel >= 2.6.11.rc4 and the latest udev (git versions)
1) you have mount your root partition
2) you have mount /proc /sys

in your init
1) run start_udev (it is distributed with udev sources)
2) later run coldplug
---- coldplug -----
#!/bin/sh

BUSSES="pci usb";

for bus in $BUSSES; do
   for DEV in /sys/bus/$bus/devices/*; do
      echo -n "Checking bus $bus device $DEV...";
      if [ -L "$DEV" -a -f $DEV/modalias ]; then
         echo "modprobing";
         modprobe `cat $DEV/modalias`;
      else
         echo "no";
      fi
   done;
done;
---------------

and of course have a hotplug handy in /sbin/hotplug
----------- /sbin/hotplug ------------
#!/bin/sh

#echo "*** hotplug 'subsystem=$1' 'MODALIAS=$MODALIAS' 'DEVPATH=$DEVPATH' ***" > /dev/kmsg;
if [ -n "$MODALIAS" -a ! -L /sys/$DEVPATH/driver ]; then
    echo "*** hotplug 'subsystem=$1' 'MODALIAS=$MODALIAS' 'DEVPATH=$DEVPATH' ***" > /dev/kmsg;
    modprobe -v $MODALIAS > /dev/kmsg;
fi

if [ -n "$DEVPATH" -a -d "/sys" ]; then
    #echo "udevsend $1 -------------" > /dev/kmsg;
    /sbin/udevsend $1;
fi

if everything goes out well you can comment out the /dev/kmesg redirection.
Oh and in my /dev I have already /dev/kmsg /dev/null /dev/console.

I am sure somebody will popup with a better script/procedure or something
but anyway here are my 2dr.

.bill


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