Understanding framebuffer drivers

[Ezequiel García]

Hi,
I am trying to understand framebuffer drivers. I am looking through DirectFB code and have already coded some little examples that accesses my 
"radeondrmfb" device through ioctls() and mmap().

Also, I've found this link, but it is very outdated (kernel 2.2)

http://www.linux-fbdev.org/HOWTO/index.html

Is there any other resource I can read ? In particular, how can I know wich ioctl each driver implements without reading the code itself ?

Greetings,
Ezequiel.


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