Re: TiBook Dual Display
On Thu, 18 Oct 2001, Michael Schmitz wrote:
> > > Lack of developer manpower (did you just volunteer to do it?). The
> > > technical specs are available to XFree members, the kernel infrastructure
> > > required to support mutiple framebuffers is in place for ages. Just make
> > > aty128fb register two separate framebuffers,
> >
> > I question if it would be a good idea to do it on the framebuffer
> > device level at this time, because you'd have to either virtualize the
> > the accel engine or only be able to use acceleration on one head in X,
> > partition the video RAM statically between the heads, ...
>
> Sure, as a first approximation I'd perhaps recommend to go without
> acceleration anyway. I'm not sure how much more synchronization than plain
> 'wait until accel idle' would be required (which happens anyway IIRC).
`Wait until accel idle' is not sufficient. You need a semaphore to protect the
accel engine from being accessed by both frame buffers devices at the same
time. No big deal.
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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