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Date:	Tue, 13 Mar 2007 01:09:55 +0000
From:	Ralf Baechle <ralf@linux-mips.org>
To:	Andrew Dyer <adyer@righthandtech.com>
Cc:	Sergei Shtylyov <sshtylyov@ru.mvista.com>,
	Marco Braga <marco.braga@gmail.com>,
	Domen Puncer <domen.puncer@telargo.com>,
	linux-mips@linux-mips.org
Subject: Re: Trouble with sound/mips/au1x00.c AC97 driver
Message-ID: <20070313010955.GA27567@linux-mips.org>
References: <20070307104930.GD25248@dusktilldawn.nl> <d459bb380703082322r18879381ma4c57149a8b7adfe@mail.gmail.com> <45F350E9.3020208@cooper-street.com> <d459bb380703120157wb3dde00p4c232e300e82fd3d@mail.gmail.com> <d459bb380703120259r53889966xd8af623ff01ef297@mail.gmail.com> <20070312103927.GC14658@moe.telargo.com> <d459bb380703120609i7d3a9e1dwf7f4fa431a9631e5@mail.gmail.com> <45F57328.8000606@ru.mvista.com> <20070313004315.GA26119@linux-mips.org> <45F5F7CA.3000503@righthandtech.com>
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On Mon, Mar 12, 2007 at 08:00:58PM -0500, Andrew Dyer wrote:

> I just looked it up.
> 
> Section 2.4.5 of the Alchemy Au1550 datasheet says that a SYNC is 
> guaranteed to commit the write buffer to memory.
> 
> Whoever is looking at this should also pay attention to the CCA bits in 
> the TLB mapping the registers (Section 2.3.6 of the manual) or the fixed 
> regions (depending on the VA used) to make sure that merging and 
> gathering are turned off.

MIPS does does no merging / gathering for uncached accesses.  KSEG1
addresses are uncached.

  Ralf