From: Dan Malek <dan@mvista.com>
To: Graham Stoney <greyham@research.canon.com.au>
Cc: Julia Elbert <jelbert@enerdyne.com>,
"'linuxppc-embedded@lists.linuxppc.org'"
<linuxppc-embedded@lists.linuxppc.org>
Subject: Re: switching linux kernels
Date: Wed, 27 Sep 2000 01:59:09 -0400 [thread overview]
Message-ID: <39D18CAD.FDC505E0@mvista.com> (raw)
In-Reply-To: 20000927004021.ABEB8BF@elph.research.canon.com.au
Graham Stoney wrote:
>
> Turning off copy-back has a global performance hit, so it's a pretty nasty
> workaround for cache coherency bugs in a single driver.
Yep, you should really fix the driver.....
> ....... does it use insx/outsx &
> friends from asm/io.h, or does it dereference pointers directly, forgetting
> the eieio's?
Please don't use in/out macros on PowerPC....especially on 8xx their
underlying address arithmetic will likely break more things that it
fixes.
Use memory mapped I/O (readb/writeb, etc.) and ioremap().....
-- Dan
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
next prev parent reply other threads:[~2000-09-27 5:59 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2000-09-26 22:34 switching linux kernels Julia Elbert
2000-09-27 0:40 ` Graham Stoney
2000-09-27 5:59 ` Dan Malek [this message]
2000-09-27 6:41 ` Graham Stoney
2000-09-27 9:31 ` Rob Taylor
2000-09-27 16:03 ` Dan Malek
2000-10-06 16:50 ` Rob Taylor
-- strict thread matches above, loose matches on Subject: below --
2000-09-26 18:24 Julia Elbert
2000-09-26 16:59 Julia Elbert
2000-09-26 0:02 Julia Elbert
2000-09-26 0:25 ` Graham Stoney
2000-09-26 15:54 ` Dan Malek
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