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 19:06:09 +0200
From:	Andi Kleen <ak@...ell.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	"Huang, Ying" <ying.huang@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"H. Peter Anvin" <hpa@...or.com>, 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


> 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.

-Andi
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