[Xorg] The big multiconsole nasty
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
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