From mboxrd@z Thu Jan  1 00:00:00 1970
From: Takashi Iwai <tiwai@suse.de>
Subject: Re: AC3 Passthru on SB Live
Date: Wed, 27 Feb 2002 18:36:25 +0100
Message-ID: <s5h7koyltd2.wl@alsa2.suse.de>
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	<NGBBLNODKDFPBFMBBFAFAEECCCAA.James@superbug.demon.co.uk>
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To: James Courtier-Dutton <James@superbug.demon.co.uk>
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At Wed, 27 Feb 2002 17:19:44 -0000,
James Courtier-Dutton wrote:
> 
> > Or, it might be the problem of dma mask.  ALSA uses 31bit mask while
> > Creative's driver uses 29bit.  But anyway this won't affect unless you
> > have more than 512MB RAM and kernel ocasionally allocates the area
> > greater than 512MB.
> Creative's driver uses 29bit mask, because a 32bit mask was creating
> problems with some users.
> 
> Maybe the SB Live is only capable of 29bits for DMA.

well, as stated above, alsa uses 31bit (not 32), so this is not
problem usually, because kernel's pci memory allocator checks only
whether the mask is 32bit or not, and if it's not 32bit, the allocator
uses always GFP_DMA flag.


Takashi

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