FrameBuffer-Xfree86 question

[Jos� Salavert Torres]

I haven't been able to configure XFree4.2.1pre1v2 to work with my 
Nvidia GeForce2 MX 400.

As a solution I'm using the framebuffer device driver for xfree, but I 
can't only use 16 bits and 800x600.

Is there any way to use the framebuffer with 1024x768 resolution 
correctly (actually  I have a black border in my screen)