how to activate /dev/fb?

[loody]

Dear all:
I get a application which need /dev/fb.
I search the web and find it is the device node of frame buffer driver.
my question is
1. how could I know the frame buffer driver is ready on my Ubuntu?
2. I find there is no /dev/fb/0 or dev/fb/1 under my ubuntu.
    does that mean what I have to do is adding the node for
application to access?
appreciate your help,
miloody