Re: Virtual framebuffer driver - mmap problem

[Shivappa Kushtagi <kushtagi@gmail.com>]

> I would like to use virtual framebuffer on a linux system which is
> installed with R.H.9 to simulate my target display ( an embedded
> device with 320*480 resolution).

== The virtual framebuffer is intended for testing _the kernel_ only.

> I have written a application which will mmap /dev/fb0 and fill it with
> some RGB values. I run framebuffer based VNC server to see whatever I
> have written. I always get a white image. Looks like mmap is mapped to
> some other address and fbvnc server is reading from somewhere else.
>
> Does the existing drivers/video/vfb.c code works ? or Do I need to
> tweak it ?

== You cannot mmap() the video memory of vfb.

==  Why don"t you use vesafb?

As I had mentioned in my earlier post, I wanted to use virtual
framebuffer to simulate the display of my target device (say some PDA
with size 320*480 ).  With vesafb, I will not be able to change the
resolution ( fbset fails telling,  invalid argument )


Is there any other framebuffer based methods to simulate a display ?

Regards
Shivappa


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