Re: [linux-fbdev] Re: 3D accel on PPC

On Tue, 20 Jun 2000, Kostas Gewrgiou wrote:

On Tue, 20 Jun 2000, Geert Uytterhoeven wrote:

quoted

On Mon, 19 Jun 2000, Kostas Gewrgiou wrote:

quoted

What is holding back ppc voodoo3 in xfree right now
is PIO support, i tried to use tdfxfb to get away from
this but there a problems there as well (the xserver
needs a 2*vramsize mapping in the framebuffer but fbdev
can't do this unless i patch tdfxfb to think that its
vram is 2*realsize, Geert any ideas how we can get away
from this ?)

Why do they want 2*vramsize? Is the extra space where no RAM is used for
something different? Can they map something there?

 In voodoo you can setup one part of the framebuffer as tiled memory,
access to this tiled memory needs more address space thats why a
mapping of 2*ram is needed.

IC.

Is this tiled memory needed for a specific video mode, or is it independent of
the video mode? In the former case, set smem_len to 2*ram when switching to
that specific video mode; in the latter case, add an ioctl() to switch between
normal and tiled video mode, taking care of smem_len as well.

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


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