Framebuffer output but no framebuffer console output

[Sylvain Garrigues <garrigue@enst.fr>]

Hello,

I wrote a framebuffer based on the virtual framebuffer (vfb.c) for an 
embedded device which has a TV output. Basically, I just had to modify 
the mmap, init, and exit functions so as to use my own memory addresses. 
I'm using a kernel 2.6.15.1 and the vfb in that tree.

This framebuffer works very well, I can make X run on top of it and see 
my X desktop on the TV. However, in console mode, it doesn't work. Well, 
it receives keyboard events as if I type 'root' <enter> 'halt', the 
embedded devices actually halts. So the problem is that there's no echo 
on the TV in console mode.

To redirect a tty to the framebuffer, I'm using the con2fb program 
(ftp://platan.vc.cvut.cz/pub/linux/matrox-latest/con2fb.c.gz 
<ftp://platan.vc.cvut.cz/pub/linux/matrox-latest/con2fb.c.gz>) which 
redirects a tty to a framebuffer. So, as I said, once redirected, I 
don't get any echo on the screen, althought key strokes are taken into 
account.

What is the problem? Is vfb unfit for console frame buffering? Should I 
consider taking vesafb as a basis? Is the con2fb wrong?  Should I 
compile vfb with some fonts? Notice that on my development station (the 
embedded device is on a PCI board), my VESA framebuffer works well, so 
my kernel is OK with console framebuffer options.

Any help would be very very appreciated.
Best regards,
Sylvain.


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