Framebuffer output but no framebuffer console output

Framebuffer output but no framebuffer console output

[Sylvain Garrigues]

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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Re: Framebuffer output but no framebuffer console output

[Sylvain Garrigues]

Sylvain Garrigues wrote:
> 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.
s/echo on the screen/echo on the TV
Sorry, I don't get any echo on the _TV_. No more echo on the screen is 
normal since the tty has been redirected.


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Framebuffer output but no framebuffer console output

[Sylvain Garrigues]

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 TV, 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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Re: Framebuffer output but no framebuffer console output

[Antonino A. Daplas]

Sylvain Garrigues wrote:
> 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.

No vfb should work.

Can you post fbset -i, cat /proc/fb and dmesg after running con2fb.

Tony


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