linux-kernel - Re: [PATCH 03/32] ACPICA: Hardware: Enable 64-bit firmware waking vector for selected FACS.

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Message-ID: <2633375.qc8AYJl8H9@vostro.rjw.lan>
Date:	Sat, 20 Jun 2015 01:40:57 +0200
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	Lv Zheng <lv.zheng@...el.com>
Cc:	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	Len Brown <len.brown@...el.com>, Lv Zheng <zetalog@...il.com>,
	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
	Bob Moore <robert.moore@...el.com>
Subject: Re: [PATCH 03/32] ACPICA: Hardware: Enable 64-bit firmware waking vector for selected FACS.

On Friday, June 19, 2015 11:38:28 AM Lv Zheng wrote:
> ACPICA commit 7aa598d711644ab0de5f70ad88f1e2de253115e4
> 
> The root cause of the reported bug might be one of the followings:

Care to describe the bug in the changelog too?  And in a few following
changelogs as well?


> 1. BIOS may favor the 64-bit firmware waking vector address when the
>    version of the FACS is greater than 0 and Linux currently only supports
>    resuming from the real mode, so the 64-bit firmware waking vector has
>    never been set and might be invalid to BIOS while the commit enables
>    higher version FACS.
> 2. BIOS may favor the FACS reported via the "FIRMWARE_CTRL" field in the
>    FADT while the commit doesn't set the firmware waking vector address of
>    the FACS reported by "FIRMWARE_CTRL", it only sets the firware waking
>    vector address of the FACS reported by "X_FIRMWARE_CTRL".


-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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