mmap problems ? in 2.4.5

mmap problems ? in 2.4.5

[Scott A McConnell]

I have a simple program that maps a frame buffer into user space and
draws an image
onto the fb.

This program worked fine under 2.4.3 however under 2.4.5 the program
runs but nothing appears on the FB. The memory I am writing to does not
appear to be the frame buffer.

Nothing has changed in my fb driver so I am wondering if anything has
changed in how memory is mapped via the kernel?

Thanks for your consideration

-- 
Scott A. McConnell

Re: mmap problems ? in 2.4.5

[Pete Popov]

Scott A McConnell wrote:

>I have a simple program that maps a frame buffer into user space and
>draws an image
>onto the fb.
>
>This program worked fine under 2.4.3 however under 2.4.5 the program
>runs but nothing appears on the FB. The memory I am writing to does not
>appear to be the frame buffer.
>
>Nothing has changed in my fb driver so I am wondering if anything has
>changed in how memory is mapped via the kernel?
>
>Thanks for your consideration
>
I believe the frame buffer driver interface changed in 2.4.5. It 
supposed to be much cleaner now and the fb driver has to do less than 
before.  You'll probably need to port your driver to 2.4.5.  If you have 
any problems, I think the fb maintainers can help you out.

Pete

Re: mmap problems ? in 2.4.5

[Geert Uytterhoeven]

On Tue, 26 Jun 2001, Pete Popov wrote:
> Scott A McConnell wrote:
> >I have a simple program that maps a frame buffer into user space and
> >draws an image
> >onto the fb.
> >
> >This program worked fine under 2.4.3 however under 2.4.5 the program
> >runs but nothing appears on the FB. The memory I am writing to does not
> >appear to be the frame buffer.
> >
> >Nothing has changed in my fb driver so I am wondering if anything has
> >changed in how memory is mapped via the kernel?
> >
> I believe the frame buffer driver interface changed in 2.4.5. It 
> supposed to be much cleaner now and the fb driver has to do less than 
> before.  You'll probably need to port your driver to 2.4.5.  If you have 
> any problems, I think the fb maintainers can help you out.

No, those fundamental changes are scheduled for 2.5.x.

Gr{oetje,eeting}s,

						Geert

--
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Re: mmap problems ? in 2.4.5

[James Simmons]

> I believe the frame buffer driver interface changed in 2.4.5. It 
> supposed to be much cleaner now and the fb driver has to do less than 
> before.  You'll probably need to port your driver to 2.4.5.  If you have 
> any problems, I think the fb maintainers can help you out.

Thats the wrapper I wrote so drivers could be written with the new api
while using 2.4.X. It hasn't gone in. Plus when/if it does it should have
a effect on any core code in fbcon. 

Re: mmap problems ? in 2.4.5

[Scott A McConnell]

I can cat data to /dev/fb and the console works just fine on the fb.

This looks like a mmap problem. Anyone else have problems?

Scott

Re: mmap problems ? in 2.4.5

[Geert Uytterhoeven]

	Hi Scott,

> I can cat data to /dev/fb and the console appears.
> 
> So it is mmap that is having trouble.
> 
> Has anyone else been having problems?

Not that I'm aware of.

Perhaps it's a MIPS specific problem?

Gr{oetje,eeting}s,

						Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

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