From: ebiederm@xmission.com (Eric W. Biederman)
To: James Bottomley <James.Bottomley@steeleye.com>
Cc: Linus Torvalds <torvalds@osdl.org>, Andrew Morton <akpm@osdl.org>,
Linux Kernel <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] Intel Alder IOAPIC fix
Date: 14 Jan 2004 22:18:49 -0700 [thread overview]
Message-ID: <m1smihg56u.fsf@ebiederm.dsl.xmission.com> (raw)
In-Reply-To: <1074012755.2173.135.camel@mulgrave>
James Bottomley <James.Bottomley@steeleye.com> writes:
> On Mon, 2004-01-12 at 19:25, Linus Torvalds wrote:
> > I think BARs 1-5 don't exist at all. Being set to all ones is common for
> > "unused" (it ends up being a normal result of a lazy probe - you set all
> > bits to 1 to check for the size of the region, and if you decide not to
> > map it and leave it there, you'll get the above behaviour).
> >
> > I suspect only BAR0 is actually real.
>
> OK, I cleaned up the patch to forcibly insert BAR0 and clear BARs 1-5
> (it still requires changes to insert_resource to work, though).
When I looked at the ia64 code that uses insert_resource (and I admit I am
reading between the lines a little) it seems to come along after potentially
allocating some resources behind some kind of bridge and then realize a bridge
is there.
Which is totally something different from this case where we just want
to ignore the BIOS, because we know better. I have seen a number of
boxes that reserver the area where apics or ioapics live. So I think
we need an IORESOURCE_TENTATIVE thing. This is the third flavor of
thing that has shown up, lately.
Want me to code up a patch?
Eric
next prev parent reply other threads:[~2004-01-15 5:24 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-01-12 2:55 [PATCH] Intel Alder IOAPIC fix James Bottomley
2004-01-12 21:24 ` Linus Torvalds
2004-01-12 22:13 ` James Bottomley
2004-01-12 23:04 ` James Bottomley
2004-01-12 23:04 ` Linus Torvalds
2004-01-13 0:25 ` James Bottomley
2004-01-13 0:45 ` James Bottomley
2004-01-13 0:25 ` Linus Torvalds
2004-01-13 16:52 ` James Bottomley
2004-01-15 5:18 ` Eric W. Biederman [this message]
2004-01-15 16:58 ` James Bottomley
2004-01-15 19:26 ` Eric W. Biederman
2004-01-15 19:54 ` James Bottomley
2004-01-16 5:32 ` Eric W. Biederman
2004-01-17 15:18 ` James Bottomley
2004-01-17 19:43 ` Eric W. Biederman
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