Thanks!
I think I finally figured it out. I think there wasn't actually 20MB
available in the framebuffer memory but only the 8MB of visible
framebuffer. Anyway, this leads me to the following question:
Is there a way to specify 2 separate memory regions that are used by
DirectFB, one as the actual framebuffer through the /dev/fb -
framebuffer device and then a second area that is used as backbuffer
etc? Meaning a non contiguous memory! I didn't see anything that would
allow me to do something like that but I might be wrong and overlooked
something.
-Bernd
________________________________
From: Amarinder Singh Sethi [mailto:[EMAIL PROTECTED]
Sent: Thursday, October 30, 2008 11:55 PM
To: Weber, Bernd
Subject: Re: [directfb-dev] Writing a gfxdriver
I would recommend reading the DirectFB tutorial for understanding the
basic concepts such as screen and layers. Regarding the memory mapping,
the video memory (frame buffer) of your graphics card should be mapped
in user space when using fbdev system. This mapping should include both
the front and back buffers provided your hardware has enough memory
available for supporting double buffering.
-Amarinder
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