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To: gentoo-embedded@g.o
From: solar <solar@g.o>
Subject: Re: Audio on a 486
Date: Tue, 21 Feb 2006 08:50:03 -0500
On Mon, 2006-02-20 at 23:09 -0500, Joe Sapp wrote:
> Hi all,
> 
> I've built a system using a uclibc stage1 tarball with the intention
> of only running dropbear, boa, and some audio player on an old 486.
> So far, it boots and I've got mplayer running using alsa as the audio
> driver, but the audio is choppy at best (I've tried other audio
> players with the same result).  It isn't caught up on buffering or
> anything like that, just seems that the processor is "too slow" (but
> I've played audio on it before when it ran Windows 95).  First, I
> tried lowering the output sample rate, but that didn't fix anything.
> I then switched to the OSS driver, which yielded some progress, but it
> still remains choppy.

got the CHOST= set at i486?
I'm not totally shocked if you don't have decent audio.
The i486 lacked mmx instructions iirc and a lot of the x86 audio 
code I've come by at gentoo depends on mmx or you end up with 
very generic routines. Try doing a little -Os -> -O[1-3] optimizations.


> After doing some searches, it seems that I might have to fiddle with
> the DMA settings of my audio card (an ALS100 ISA card).  Can anybody
> give me a suggestion on what I can try other than this or how to do
> something like this in the first place?
> 
-- 
solar <solar@g.o>
Gentoo Linux

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References:
Audio on a 486
-- Joe Sapp
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Updated Jun 17, 2009

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