Re: [Linux-fbdev-devel] atyfb and the Mach64 LT PRO

[Till A. <ti...@ad...>]

# Thus spake Geert Uytterhoeven (ge...@li...):

> On Sat, 17 Nov 2001, Till Adam wrote:
> > So does the atyfb driver need to be extended to set the stretching
> > registers to a sane state to work properly with this card? If so, is
> 
> Yes.
> 
> > there someone on this list for whom this would be a three minute job and
> > who'd be willing to hack this in? I'm willing to help and test, but I'd
> > appreciate the guidance of someone with more experience in this.
> 
> Some PPC people already started working on this.

Any details on who to hook up with or where to find these folks? A
mailing list perhaps?

> > I also noticed that the vertical yres is weird when using atyfb. I found
> > this around line 950 of atyfb_base.c which I dont understand and which I
> > think causes this:
> >
> > if (var.yres == var.yres_virtual) {
> >     32 vram = (fb->total_vram - (PAGE_SIZE << 2));
> >     var.yres_virtual = ((vram * 8) / var.bits_per_pixel) / var.xres_virtual;
> >     if (var.yres_virtual < var.yres)
> >          var.yres_virtual = var.yres;
> > }
> >
> > What is the reasoning behind this?
> 
> You mean the virtual vertical resolution? It's made as large as possible, so
> the console driver can use the virtual screen to do fast text scrolling, using
> panning of the virtual screen.

Oh, that makes sense. Thanks for explaining that.

Cheers,

Till

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