[Xorg] The big multiconsole nasty

Egbert Eich eich at pdx.freedesktop.org
Thu Jul 15 02:40:24 PDT 2004

Alan Cox writes:
 > On Maw, 2004-07-13 at 20:18, Jesse Barnes wrote:
 > > Sure, that would be even better.  For legacy space, size would usually be 64k, 
 > > right?  Or would we want to add a 'base' argument and allow callers to just 
 > > map the ports they're interested in? 
 > For platforms where port space can be bigger than 16bit and when port
 > space is mmio mapped I can see it helping. 

Are there such platforms - and is this relevant at all today?
I always thought that PIO was a cheap way of implementing HW 
access in days where you only had 16 memory address lines and
address decoders were expensive so that you only wanted to
decode a few address lines.
Therefore today I'd expect MMIO would be the method of choice
if HW required more than a few ports or does not have to care
about legacy.


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