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Message-ID: <46FC32FE.9070302@zytor.com>
Date: Thu, 27 Sep 2007 15:47:26 -0700
From: "H. Peter Anvin" <hpa@...or.com>
To: Jordan Crouse <jordan.crouse@....com>
CC: jkeating@...hat.com, Joerg Pommnitz <pommnitz@...oo.com>,
Chuck Ebbert <cebbert@...hat.com>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Andi Kleen <ak@...e.de>
Subject: Re: More E820 brokenness
Jordan Crouse wrote:
>
> Breaks on the Geode - original behavior.
>
> I think that having boot_prams.e820_entries != 0 makes the kernel
> assume the e820 data is correct.
>
Okay, now I'm utterly baffled how 2.6.22 ever worked on this Geode,
because this, to the best of my reading, mimics the 2.6.22 behavior
exactly. DID IT REALLY, and/or did you make any kind of configuration
changes?
>> I want to emphasize that this is seriously broken. Using a partial e820
>> map could have disastrous results, since the kernel will have partial
>> memory map information and not know about reserved areas, etc. Part of
>> me feels that the right thing to do is what the current git kernel does
>> -- either fall back to e801, or stop and error.
>
> I'm inclined to agree.
Arguably the right thing to do is to find the responsible BIOS engineer
and shoot them, but that's hard to do without robotics.
-hpa
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