The udev is available in http://www.ch.kernel.org/pub/linux/utils/kernel/hotplug/udev-130.tar.gz.

First of all, we need to enter the scratchbox environment.

$ cd /scratchbox $ ./login

Download the udev package

# wget -O http://www.ch.kernel.org/pub/linux/utils/kernel/hotplug/udev-130.tar.gz # tar xzvf udev-130.tar.gz

Configure and compile udev

# tar xzvf udev-130.tar.gz # cd udev-130 # ./configure

Add the following lines into udevd.c at line 50

#ifndef SO_RCVBUFFORCE #define SO_RCVBUFFORCE  33 #endif

Compile it

# make

$ cp /scratchbox/users/wycc/udev-130/udev/udevd /opt/CNS2100-LSDK/rootfs/default/sbin $ cp /scratchbox/users/wycc/udev-130/udev/udevadm /opt/CNS2100-LSDK/rootfs/default/sbin

$ mkdir -p /opt/CNS2100-LSDK/rootfs/default/etc/udev/rules.d $ cp /scratchbox/users/wycc/udev-130/udev.conf /opt/CNS2100-LSDK/rootfs/default/etc/udev $ cp -a /scratchbox/users/wycc/udev-130/rules/rules.d /opt/CNS2100-LSDK/rootfs/default/etc/udev $ cd opt/CNS2100-LSDK/rootfs/default/etc/udev; tar xzvf udev-rules.tgz $ mkdir -p /opt/CNS2100-LSDK/rootfs/default/sys

Modify the init script to start the udev. We need to insert the following lines into the /opt/CNS2100-LSDK/rootfs/default/etc/init.d/rc.sysinit

mount -t sysfs sysfs /sys mount -t tmpfs / /dev /sbin/udevd --daemon /sbin/udevadm trigger

The udevd --daemon is used to start the udev daemon which can read data from the sysfs and create files under /dev.

The udevadm is used to create device files for the drivers which is compiled within the kernel staticly.

Build a new rootfs

Please following the instruction is the previos section to build a new kernel image and download it by using the bootloader. The udev daemon should be runned as a daemon. You can insert a USB pen driver to test it.

Now, we will modify the rules to mount the USB pen driver automatically under the /mnt.