XF4 (mach64) help please

Geert Uytterhoeven geert at linux-m68k.org
Fri Apr 20 04:38:00 EST 2001

On Thu, 19 Apr 2001, Iain Sandoe wrote:
> On Thu, Apr 19, 2001,  Ani Joshi wrote:
> > On Thu, 19 Apr 2001, William Blew wrote:
> >> On Thu, 19 Apr 2001, Iain Sandoe wrote:
> >> > 2/  how difficult would it be to plumb the scroll acceleration back into
> the
> >> > console driver?  (would one need access to the NDA stuff?) -- the scrolling
> >> > of console is a real problem in blocking sound :-/
> >>
> >> For mach64 at least, I would start by porting the CopyScreen2Screen XXA
> >> operation into the kernel and then using it during scrolling.
> >
> > This is already done by atyfb in the kernel,
> then why is the atyfb scroll (and fbdevhw) _so_ much slower than the X
> 'native' driver ... the same reason as below?

Because xterm uses jump scroll? Try scrolling line by line in X11.

> >however the problem lies in
> > the entire fbcon layer where there is some improper locking/interrupts

Read: the entire console layer. Fbcon cannot (read: couldn't) use interrupts
because the upper console layer disables (disabled) interrupts.

> > going on there.  This was discussed here and on linux-fbdev a few months
> > ago and I believe will be addressed in 2.5.
> and there is a (temporary) fix for it (I believe) involving a patch from
> Andrew Morton - (which I haven't had time to try on PPC yet).  Will that fix
> the slow console scroll as well?

It's supposed to. Haven't tried it yet, though.



Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert at 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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