linux-kernel - Re: [PATCH] rtc: Disable EFI rtc for x86

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Date:	Tue, 11 Nov 2014 11:38:31 +0000
From:	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Austin S Hemmelgarn <ahferroin7@...il.com>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	Pali Rohár <pali.rohar@...il.com>,
	Matt Fleming <matt.fleming@...el.com>,
	Borislav Petkov <bp@...en8.de>,
	Mark Salter <msalter@...hat.com>,
	Alessandro Zummo <a.zummo@...ertech.it>,
	rtc-linux@...glegroups.com, linux-efi@...r.kernel.org,
	linux-kernel@...r.kernel.org, Dave Young <dyoung@...hat.com>
Subject: Re: [PATCH] rtc: Disable EFI rtc for x86

> > look further into the options I have set in my kernel build, I may have
> > changed something else without remembering between booting with and
> > without the CSM enabled.
> > 
> 
> It could also be that the non-CSM BIOS somehow remaps the CMOS registers.

I don't believe there is anything which prevents the CSM from faking a
CMOS clock using SMM from whatever is actually in the hardware.

Alan
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