linux-kernel - Re: [PATCH 1/3 -v4] x86_64 EFI runtime service support: EFI basic runtime service support

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Date:	Thu, 25 Oct 2007 10:08:16 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Andi Kleen <ak@...ell.com>
CC:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"Huang, Ying" <ying.huang@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...hat.com>,
	Chandramouli Narayanan <mouli@...ux.intel.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Arjan van de Ven <arjan@...radead.org>
Subject: Re: [PATCH 1/3 -v4] x86_64 EFI runtime service support: EFI basic
 runtime service support

Andi Kleen wrote:
>> Especially for accessing the real time clock that has a well
>> defined hardware interface going through efi an additional
>> software emulation layer looks like asking for trouble.
> 
> I agree it's pointless for the hardware clock, but EFI 
> also offers services to write some data to the CMOS RAM
> which could be very useful to save oops data over reboot.
> I don't think this can be done safely otherwise 
> without BIOS cooperation.
> 

The ability to scurry away even a small amount of data without relying 
on the disk system is highly desirable.  Think next-boot type information.

	-hpa
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