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Re: Trouble with sound/mips/au1x00.c AC97 driver

To: Andrew Dyer <adyer@righthandtech.com>
Subject: Re: Trouble with sound/mips/au1x00.c AC97 driver
From: Ralf Baechle <ralf@linux-mips.org>
Date: Tue, 13 Mar 2007 01:09:55 +0000
Cc: Sergei Shtylyov <sshtylyov@ru.mvista.com>, Marco Braga <marco.braga@gmail.com>, Domen Puncer <domen.puncer@telargo.com>, linux-mips@linux-mips.org
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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

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