"remap_page_range" i810 compile time problem ..

"remap_page_range" i810 compile time problem ..

[Mukund JB.]

Hi all,

I have problem with compiling the i810fb driver downloaded from
Sourceforge site.
I have D/W the i810fb patch "linux-i810fb-0.0.35.tar.bz2".

When I run the make modules I get the following error

i810_main.c: 643: warning: passing arg 1 of 'remap_page_range_R2baf18f2'
makes pointer from integer without a cast
i810_main.c: 643: incompatible type for argument 4 of
'remap_page_range_R2baf18f2'
i810_main.c: 643: too few arguments to function
'remap_page_range_R2baf18f2'
Make[3]: *** [I810_main.c] Error 1
........
......

The call to "remap_page_range()" is as follows:-

return (io_remap_page_range(vma->vm_start, off, vma->vm_end -
vma->vm_start, vma->vm_page_prot)) ? -EAGAIN : 0;

I am running Redhat 9 Linux.

Regards,
Mukund jampala




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Re: "remap_page_range" i810 compile time problem ..

[Antonino A. Daplas]

On Wednesday 09 March 2005 19:14, Mukund JB. wrote:
> Hi all,
>
> I have problem with compiling the i810fb driver downloaded from
> Sourceforge site.
> I have D/W the i810fb patch "linux-i810fb-0.0.35.tar.bz2".
>
> When I run the make modules I get the following error

Try the i810fb-lite driver.  If that does not work, let me know what
kernel version you are using.

I haven't updated the driver for quite some time so it may be suffering
from bitrot.

Tony




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RE: "remap_page_range" i810 compile time problem ..

[Mukund JB.]

Hi adaplas,

Thankful to u for making things clear at every level.

> > But when I try this without accel=1 rotation fails. Can u just
narrate
> > me what is accel accentually doing?
> 
> Because if accel is on, the driver is using it's own version of
drawing
> functions which are flexible enough that additional features can be
added,
> such as screen rotation.
> 
> If accel is off, the driver will use the generic functions which
cannot do
> screen rotation.  Of course, one can write a software version that can
do
> screen rotation.

So, u mean the i810fb driver will process the command line parameters &
if finds the accel is "1" in the list, it will use its own functions or
else it will use the generic functions provided in the fbgen.c file.

This is my understanding about fb driver architecture

			Application
			-----------
		  XFree86 / Directfb (Embedded)
			-----------
			 FB driver
			-----------
			 HARDWARE

Are these files below a part of fb driver or do they come under a
different level in fb driver architecture?

fbcon.c - low level framebuffer based console driver
fbcon-cfb* - low level framebuffer based operations for 8 bpp packed
pixels
How do I differentiate between the above two?

fbcmap.c 	- It handles color mapping
fbcon-plan2p*

I find fbdevhw.a & I find groups referring to it.
I think it is a library. If so, give me some inputs where we can use it.
Please do correct if I am going OFF-TRACK understanding FB drivers.

Where exactly should I place the fbdevhw.a in the above shown
architecture?

Regards,
Mukund jampala



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Re: "remap_page_range" i810 compile time problem ..

[Antonino A. Daplas]

On Friday 11 March 2005 14:36, Mukund JB. wrote:
> Hi adaplas,
>
> Thankful to u for making things clear at every level.
>
> > > But when I try this without accel=1 rotation fails. Can u just
>
> narrate
>
> > > me what is accel accentually doing?
> >
> > Because if accel is on, the driver is using it's own version of
>
> drawing
>
> > functions which are flexible enough that additional features can be
>
> added,
>
> > such as screen rotation.
> >
> > If accel is off, the driver will use the generic functions which
>
> cannot do
>
> > screen rotation.  Of course, one can write a software version that can
>
> do
>
> > screen rotation.
>
> So, u mean the i810fb driver will process the command line parameters &
> if finds the accel is "1" in the list, it will use its own functions or
> else it will use the generic functions provided in the fbgen.c file.

Above is correct, except that i810fb, if accel is disabled will use the
functions in fbcon-cfb*.c, not fbgen.c.

>
> This is my understanding about fb driver architecture
>
> 			Application
> 			-----------
> 		  XFree86 / Directfb (Embedded)
> 			-----------
> 			 FB driver
> 			-----------
> 			 HARDWARE
>
> Are these files below a part of fb driver or do they come under a
> different level in fb driver architecture?

The above is correct, assuming that XFree86 uses the 'fbdev' driver.

>
> fbcon.c - low level framebuffer based console driver
> fbcon-cfb* - low level framebuffer based operations for 8 bpp packed
> pixels
> How do I differentiate between the above two?

fbcon.c is the glue between console and fbdev.  fbcon-cfb* contains
generic drawing functions for framebuffers with packed pixel format.

>
> fbcmap.c 	- It handles color mapping
> fbcon-plan2p*
>
> I find fbdevhw.a & I find groups referring to it.

fbdevhw, if I'm not mistaken, came from XFree86/Xorg.  It contains
helper functions used by XFree86 to talk to fbdev.

> I think it is a library. If so, give me some inputs where we can use it.
> Please do correct if I am going OFF-TRACK understanding FB drivers.
>
> Where exactly should I place the fbdevhw.a in the above shown
> architecture?

Probably between  XFree86 and fbdev.

Tony





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