From: Marcus Comstedt <marcus@mc.pp.se>
To: Milton Miller <miltonm@bga.com>
Cc: linuxppc-dev@ozlabs.org
Subject: Re: [PATCH] EHCI Oops on CONFIG_NOT_COHERENT_CACHE system
Date: Wed, 30 Aug 2006 19:42:31 +0200 [thread overview]
Message-ID: <yf9veoa6ry0.fsf@omoikane.mc.pp.se> (raw)
In-Reply-To: <3e3f83654b861ae77c6c07cf207ba6af@bga.com> (Milton Miller's message of "Wed, 30 Aug 2006 09:24:57 -0500")
Milton Miller <miltonm@bga.com> writes:
> I think its a case of the people that know the architecture agree
> that atomics and DMA do not mix, and that this is an issue for
> usb-devel to fix.
That was precisely the kind of agreement I was looking for. :-)
> The other question is: does the current access polute the cache by
> reading things where the device is supposed to be writing?
Well, that shouldn't be an issue as the page is cache-inhibited.
And on systems with cache coherency, where the pages are not cache-
inhibited, this would be handled by bus snooping, right?
> My suggestion is take the issue over there, and only cc us here if
> you get pushback over there.
Ok, will do. Thanks.
// Marcus
next prev parent reply other threads:[~2006-08-30 17:43 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <9mz9np82b.fsf@omoikane.mc.pp.se>
2006-08-30 14:24 ` [PATCH] EHCI Oops on CONFIG_NOT_COHERENT_CACHE system Milton Miller
2006-08-30 17:42 ` Marcus Comstedt [this message]
2006-08-27 16:17 Marcus Comstedt
2006-08-29 15:07 ` Gerhard Pircher
2006-08-29 21:04 ` Marcus Comstedt
2006-08-30 9:01 ` Gerhard Pircher
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