Re: Video Overlay on C3200

On Tuesday 06 March 2007 22:18, Graeme Gregory wrote:
> On Tue, Mar 06, 2007 at 09:02:27PM +0000, Tim Chick wrote:
> > One thing I noticed is that mplayer by default was being compiled for arm
> >  v3 instruction set. This meant that ldrh and strh were missing, and all
> > the pipeline optimisation done by the compiler was messed up. Compiling
> > for xscale drops cpu usage of video decode by about 20%! I guess this is
> > why there are armv5te packages on the feed browser, but it's not exactly
> > clear that those are the ones which should be used. In fact, why do the
> > arm-v3 ones even exist? arm v4 (strongarm) would be a better minimum? But
> > why is there a minimum when allpackages are built for an xscale?
>
> By default it should be built for armv4, and I have built for armv5 and
> iwmmxt and seen very little difference in performance from armv4.
>
I agree, there won't be much difference between xscale and arm4, but when I 
just used bitbake here I got arm-v3. Perhaps I am doing something wrong with 
bitbake?

Ok, I've just looked at the .ipk from the oz feeds, and it does have ldrh in 
it, so I guess I can't drive bitbake.

Thanks,
Tim


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