snd_ich dies

[Ariff Abdullah]

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
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/pgp-signature
Size: 187 bytes
Desc: not available
Url : http://lists.freebsd.org/pipermail/freebsd-multimedia/attachments/20060811/a020255b/attachment.pgp