Re: [PATCH 00/10] Enhance /dev/mem to allow read/write of arbitrary physical addresses
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- To: Matthew Garrett <mjg@xxxxxxxxxx>
- Subject: Re: [PATCH 00/10] Enhance /dev/mem to allow read/write of arbitrary physical addresses
- From: "H. Peter Anvin" <hpa@xxxxxxxxx>
- Date: Tue, 05 Jul 2011 10:56:38 -0700
- Cc: Ingo Molnar <mingo@xxxxxxx>, Petr Tesarik <ptesarik@xxxxxxx>, Christoph Hellwig <hch@xxxxxxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Fenghua Yu <fenghua.yu@xxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Paul Mundt <lethal@xxxxxxxxxxxx>, Russell King <linux@xxxxxxxxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Tony Luck <tony.luck@xxxxxxxxx>, x86@xxxxxxxxxx, linux-arm-kernel@xxxxxxxxxxxxxxxxxxx, linux-ia64@xxxxxxxxxxxxxxx, linux-sh@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, Arjan van de Ven <arjan@xxxxxxxxxxxxx>, Dave Jones <davej@xxxxxxxxxx>, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
- In-reply-to: <20110705174901.GA30531@srcf.ucam.org>
- List-id: <linux-ia64.vger.kernel.org>
- References: <201106171038.25988.ptesarik@suse.cz> <201107012134.45881.ptesarik@suse.cz> <20110701195629.GA19057@elte.hu> <201107012244.57593.ptesarik@suse.cz> <20110703194618.GB27022@elte.hu> <20110705174901.GA30531@srcf.ucam.org>
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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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