snd_ich dies
Ariff Abdullah
ariff at FreeBSD.org
Fri Aug 11 07:55:47 UTC 2006
On Fri, 11 Aug 2006 09:25:11 +0900
Pyun YongHyeon <pyunyh at gmail.com> wrote:
> On Fri, Aug 11, 2006 at 05:09:19AM +0800, Ariff Abdullah wrote:
> > On Thu, 10 Aug 2006 15:51:09 +0900 (JST)
> > TAMURA Kent <kent at NetBSD.org> wrote:
> > >
> > > > My audio dies, espcially when my system is under heavy load.
> > > > Otherwise I can maybe play music for an half hour, (with
> > > > choppy sound).
> > >
> > > > vendor = 'Intel Corporation'
> > > > device = '82440MX AC'97 Audio Controller'
> > >
> > > 440MX has a hardware erratum and an audio driver should have
> > > special handling to avoid it. The drivers of NetBSD and ALSA
> > > does it, and FreeBSD's does not for now.
> > >
> > > ALSA:
> > > http://hg-mirror.alsa-project.org/alsa-kernel?cmd=changeset;node=e0d1f8060d20;style=gitweb
> > >
> > > NetBSD:
> > > http://www.netbsd.org/cgi-bin/query-pr-single.pl?number=19919
> > > http://cvsweb.netbsd.org/bsdweb.cgi/src/sys/dev/pci/auich.c.diff?r1=1.33&r2=1.34
> > >
> > >
> > Looks trivial enough, though both BUS_DMA_NOCACHE/COHERENT almost
> > a noop for most FreeBSD archs. I'll revisit this sooner using
> > other non-cacheable method.
> >
> >
>
> AFAIK arm/sparc64 has implemented BUS_DMA_COHERENT. But it seems
> that BUS_DMA_COHERENT for sparc64 implementation is not complete.
>
> What makes me wonder is why NetBSD needed an additional
> BUS_DMA_NOCACHE flag as the purpose of BUS_DMA_COHERENT is to map
> pages into uncached address space or to set cache-inhibit bits in
> PTE.
>
> Btw, the workaround suggested by Intel said it _reduces_ the
> frequency of the failure(Master Abort). Because it does not remove
> the bug I wonder how it works well in real hardware.
>
Not much choice then.
Ok, Emil, take this:
http://people.freebsd.org/~ariff/test/ich.c
--
Ariff Abdullah
FreeBSD
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