Re: [Linux-fbdev-devel] Re: [linux-fbdev] Is a FontCache worth implementing ?

[Brad D. <br...@ne...>]

On 12 Mar 2001 11:43:07 +0100, Sven LUTHER wrote:
> On Sat, Mar 10, 2001 at 01:56:07AM -0800, James Simmons wrote:
> > 
> > >> Using a image blitter you can translate that data from normal RAM to
> > >> the video card memory. The nice thing about a image blitter is you can
> > >> do depth translations (mono to depth X).
> > >
> > >Yes, that was killed my current (test) implementation : 16 colors
> > >mean 16 copies of each glyph. Yuck (8 Mb for 512 glyhs, 16x16 32bpp)
> > 
> > I agree with you about the PCI bus. Slow to go over. I want to maximize
> > fbcon as much as possible. I'm working on the removal of the
> > console_spinlock so we can use DMA. This will greatly speed up fbcon. I
> 
> Err, ...
> 
> so this would mean using the drm/dri stuff for doing DMA ?

No.  That is well beyond the scope of fbdev.  All we really want is fast
text. :-)  We'll be using DMA more like how storage controllers use it,
not how X uses it.

> Will this enable us to do accelerated Mesa on fbdev ?

Hmm.  I suppose in theory you could, but it would be card dependent with
lots of userland help.

Brad Douglas
br...@ne...
http://www.linux-fbdev.org