linux-kernel - Re: [PATCH 00/10] Enhance /dev/mem to allow read/write of arbitrary physical addresses

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Message-ID: <4E135056.3060906@zytor.com>
Date:	Tue, 05 Jul 2011 10:56:38 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Matthew Garrett <mjg@...hat.com>
CC:	Ingo Molnar <mingo@...e.hu>, Petr Tesarik <ptesarik@...e.cz>,
	Christoph Hellwig <hch@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Fenghua Yu <fenghua.yu@...el.com>,
	Ingo Molnar <mingo@...hat.com>,
	Paul Mundt <lethal@...ux-sh.org>,
	Russell King <linux@....linux.org.uk>,
	Thomas Gleixner <tglx@...utronix.de>,
	Tony Luck <tony.luck@...el.com>, x86@...nel.org,
	linux-arm-kernel@...ts.infradead.org, linux-ia64@...r.kernel.org,
	linux-sh@...r.kernel.org, linux-kernel@...r.kernel.org,
	Arjan van de Ven <arjan@...radead.org>,
	Dave Jones <davej@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH 00/10] Enhance /dev/mem to allow read/write of arbitrary
 physical addresses

On 07/05/2011 10:49 AM, Matthew Garrett wrote:
> On Sun, Jul 03, 2011 at 09:46:18PM +0200, Ingo Molnar wrote:
> 
>> But those tables wont be in regular RAM (they will be in ROM or in 
>> RAM marked non-RAM in a special way in the e820 tables).
>>
>> dmidecode certainly works on Fedora.
> 
> I've repeatedly wanted to dump EFI data that's flagged as E820_RESERVED 
> above the top of RAM and had to hack the kernel every time. I'm entirely 
> in favour of not having to hack the kernel every time.
> 

That definitely needs to be fixed.

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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