linuxconsole-dev

fbdev minor and major numbers, which file to believe, and other stuff

[Sven L. <lu...@dp...>]

Hello, ...

I am running pm3fb wrotten by Romain dolbeau in the 2.4.2 kernel, and looking
trough the documentation file, i noticed the following :

linux/Documentation/fb/framebuffer.txt says :

By convention, the following device nodes are used (numbers indicate the
device minor numbers):

      0 = /dev/fb0      First frame buffer
      1 = /dev/fb1      Second frame buffer
      ...
     31 = /dev/fb31     32nd frame buffer

but linux/Documentation/devices.txt says :

 29 char        Universal frame buffer
                  0 = /dev/fb0          First frame buffer
                 32 = /dev/fb1          Second frame buffer
                ...
                224 = /dev/fb7          Eighth frame buffer

                All additional minor numbers are reserved.  

Which one should i believe ? Notice, that on my debian system, MAKEDEV is
building fb# conforming to the devices.txt stuff, (makedev version
2.3.1-50.1). this is from unstable (but a few weeks old already).

Another 2 question i have, concerning the pm3fb fbdev :

  * pm3fb_setup never does get called, altough it is listed in fbmem.c at the
    right place, i think. As a consequence of this all options are ignored.
    What is wrong here ?
			    
  * i have two pm3 on the same board, which both get allocated a fbdev (well
    fb0 and fb1). But all console are still on fb0, and con2fbmap 2 /dev/fb1,
    which should but console 2 (or 3) on /dev/fb1 does nothing ...


Friendly,

Sven Luther

Re: [linux-fbdev] fbdev minor and major numbers, which file to believe, and other stuff

[Geert U. <ge...@li...>]

On Wed, 7 Mar 2001, Sven LUTHER wrote:
> linux/Documentation/fb/framebuffer.txt says :
> 
> By convention, the following device nodes are used (numbers indicate the
> device minor numbers):
> 
>       0 = /dev/fb0      First frame buffer
>       1 = /dev/fb1      Second frame buffer
>       ...
>      31 = /dev/fb31     32nd frame buffer
> 
> but linux/Documentation/devices.txt says :
> 
>  29 char        Universal frame buffer
>                   0 = /dev/fb0          First frame buffer
>                  32 = /dev/fb1          Second frame buffer
>                 ...
>                 224 = /dev/fb7          Eighth frame buffer
> 
>                 All additional minor numbers are reserved.  
> 
> Which one should i believe ? Notice, that on my debian system, MAKEDEV is

linux/Documentation/fb/framebuffer.txt.

Or linux/Documentation/devices.txt in 2.4.2-ac13. Linux just throws away all
patches to change this I sent so far :-(

> building fb# conforming to the devices.txt stuff, (makedev version
> 2.3.1-50.1). this is from unstable (but a few weeks old already).

Ugh...

If you use the old minors, you'll see a warning printed on the console.

Gr{oetje,eeting}s,

						Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- ge...@li...

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
							    -- Linus Torvalds

Re: [linux-fbdev] fbdev minor and major numbers, which file to believe, and other stuff

[Sven L. <lu...@dp...>]

On Wed, Mar 07, 2001 at 10:17:03PM +0100, Geert Uytterhoeven wrote:
> On Wed, 7 Mar 2001, Sven LUTHER wrote:
> > linux/Documentation/fb/framebuffer.txt says :
> > 
> > By convention, the following device nodes are used (numbers indicate the
> > device minor numbers):
> > 
> >       0 = /dev/fb0      First frame buffer
> >       1 = /dev/fb1      Second frame buffer
> >       ...
> >      31 = /dev/fb31     32nd frame buffer
> > 
> > but linux/Documentation/devices.txt says :
> > 
> >  29 char        Universal frame buffer
> >                   0 = /dev/fb0          First frame buffer
> >                  32 = /dev/fb1          Second frame buffer
> >                 ...
> >                 224 = /dev/fb7          Eighth frame buffer
> > 
> >                 All additional minor numbers are reserved.  
> > 
> > Which one should i believe ? Notice, that on my debian system, MAKEDEV is
> 
> linux/Documentation/fb/framebuffer.txt.
> 
> Or linux/Documentation/devices.txt in 2.4.2-ac13. Linux just throws away all
> patches to change this I sent so far :-(

:(((

> > building fb# conforming to the devices.txt stuff, (makedev version
> > 2.3.1-50.1). this is from unstable (but a few weeks old already).
> 
> Ugh...
> 
> If you use the old minors, you'll see a warning printed on the console.

That's how i noticed this, will be filling a bug against the dbeian makedev
package, unless you want to do it. When was this change done (so i can give
more advanced info about this).

Friendly,

Sven Luther

Re: [linux-fbdev] fbdev minor and major numbers, which file to believe, and other stuff

[Geert U. <ge...@li...>]

On Thu, 8 Mar 2001, Sven LUTHER wrote:
> > Ugh...
> > 
> > If you use the old minors, you'll see a warning printed on the console.
> 
> That's how i noticed this, will be filling a bug against the dbeian makedev
> package, unless you want to do it. When was this change done (so i can give
> more advanced info about this).

Go ahead! The change is about 1 year old. Support for the old minors will
disappear in early 2.5.x.

Gr{oetje,eeting}s,

						Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- ge...@li...

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
							    -- Linus Torvalds

Re: [linux-fbdev] fbdev minor and major numbers, which file to believe, and other stuff

[Sven L. <lu...@dp...>]

On Thu, Mar 08, 2001 at 09:51:19AM +0100, Geert Uytterhoeven wrote:
> On Thu, 8 Mar 2001, Sven LUTHER wrote:
> > > Ugh...
> > > 
> > > If you use the old minors, you'll see a warning printed on the console.
> > 
> > That's how i noticed this, will be filling a bug against the dbeian makedev
> > package, unless you want to do it. When was this change done (so i can give
> > more advanced info about this).
> 
> Go ahead! The change is about 1 year old. Support for the old minors will
> disappear in early 2.5.x.

Ok, will do it, but err, when i was speaking about the time of the change, i
was asking about kernel versions. Debian is still supporting 2.2.x kernels.
(especially 2.2.10 on apus)

Friendly,

Sven Luther