At 2016-10-29 00:28:30, g4@novadsp.com wrote:
>Hello
>
>> And could you tell me how to run udev or mdev?
>
>This is quite useful: http://free-electrons.com/doc/mdev-lab.pdf

Thank you!  After adding "mdev -s" in file /etc/init.d/rcS, I can find device nodes in /dev/ directory