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

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Message-ID: <20110705174901.GA30531@srcf.ucam.org>
Date:	Tue, 5 Jul 2011 18:49:01 +0100
From:	Matthew Garrett <mjg@...hat.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Petr Tesarik <ptesarik@...e.cz>, "H. Peter Anvin" <hpa@...or.com>,
	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 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.

-- 
Matthew Garrett | mjg59@...f.ucam.org
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