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mknod /dev/video0

I got my USB cam working with mounted usbfs.
Now i'm trying to use video4linux and must have access to a character device 
file. The usual way is to open /dev/video* and read from it.
I have compiled my kernel with USB and v4l.

But when running on dev board...
There is noone! and i can't make one "manually" as bttv doc says like

    mknod /dev/video0 c 81 0

because I have no permission to write to "/dev" on dev-board.

What do I got to do to make this character device file?