From: Ralf Baechle <ralf@linux-mips.org>
To: "Maciej W. Rozycki" <macro@ds2.pg.gda.pl>
Cc: atul srivastava <atulsrivastava9@rediffmail.com>,
linux-mips@linux-mips.org
Subject: Re: a quick question regarding CONFIG_MIPS_UNCACHED..
Date: Thu, 28 Nov 2002 17:15:19 +0100 [thread overview]
Message-ID: <20021128171519.A18165@linux-mips.org> (raw)
In-Reply-To: <Pine.GSO.3.96.1021128164709.8C-100000@delta.ds2.pg.gda.pl>; from macro@ds2.pg.gda.pl on Thu, Nov 28, 2002 at 04:51:57PM +0100
On Thu, Nov 28, 2002 at 04:51:57PM +0100, Maciej W. Rozycki wrote:
> You are looking at obsolete code -- unless you have specific conditions
> to use an explicit caching attribute for KSEG0, you should set it like the
> rest of the code does it, i.e.:
>
> change_cp0_config(CONF_CM_CMASK, CONF_CM_DEFAULT);
>
> To avoid surprises here and elsewhere, you should make sure
> CONFIG_NONCOHERENT_IO is set appropriately, too.
We've talked about this before - the specification of the ll/sc
instructions says they only work ok on cached memory. In the real world
they seem to work also in uncached memory but I'd not bet the farm on
that, too many implementations out there, too many chances for subtle
bugs.
Ralf
next prev parent reply other threads:[~2002-11-28 16:16 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-11-27 9:11 a quick question regarding CONFIG_MIPS_UNCACHED atul srivastava
2002-11-28 15:51 ` Maciej W. Rozycki
2002-11-28 16:15 ` Ralf Baechle [this message]
2002-11-29 11:56 ` Maciej W. Rozycki
2002-11-29 12:42 ` Ralf Baechle
2002-11-29 13:03 ` Maciej W. Rozycki
2002-11-29 13:42 ` Ralf Baechle
2002-11-29 14:23 ` Maciej W. Rozycki
2002-11-29 13:49 ` Carsten Langgaard
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