linux-kernel - Re: [patch] x86: Introduce BOOT_EFI and BOOT

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Message-ID: <53102F3C.4020806@linux.intel.com>
Date:	Fri, 28 Feb 2014 14:39:56 +0800
From:	"Li, Aubrey" <aubrey.li@...ux.intel.com>
To:	Matthew Garrett <mjg59@...f.ucam.org>
CC:	"alan@...ux.intel.com" <alan@...ux.intel.com>,
	linux-kernel@...r.kernel.org,
	"H. Peter Anvin" <hpa@...ux.intel.com>, Len.Brown@...el.com,
	Adam Williamson <awilliam@...hat.com>
Subject: Re: [patch] x86: Introduce BOOT_EFI and BOOT_CF9 into the reboot
 sequence loop

On 2014/2/28 14:23, Matthew Garrett wrote:
> On Fri, Feb 28, 2014 at 02:20:41PM +0800, Li, Aubrey wrote:
> 
>> Well, I already figured that out. Reset Register Supported flag is ZERO
>> in FACP table. I attached this table for your interesting.
> 
> Ok, in that case we need to check how Windows deals with a FACP that has 
> this flag set to 0 but valid looking registers defined. I'll see if I 
> can do that tomorrow.
> 

Just let you know, Windows8.1 calls EFI on these boxes for reboot/shutdown.

I'll be surprise if other windows version ignores RESET_REG_SUP to use
ACPI reset registers.

=========ACPI spec ==============================
RESET_REG_SUP: If set, indicates the system supports system reset via
the FADT RESET_REG as described in Section 4.8.3.6
=================================================

Thanks for checking that, please keep me posted. I'll re-submit the
patch after you have an update.

-Aubrey
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