linux-kernel - Re: [PATCH] x86: Bypass legacy PIC and PIT on ACPI hardware reduced platform

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Message-ID: <1425571502.3838.151.camel@linux.intel.com>
Date:	Thu, 05 Mar 2015 16:05:02 +0000
From:	Alan Cox <alan@...ux.intel.com>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:	Borislav Petkov <bp@...en8.de>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Ingo Molnar <mingo@...nel.org>,
	"Li, Aubrey" <aubrey.li@...ux.intel.com>,
	"H. Peter Anvin" <hpa@...ux.intel.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, Len.Brown@...el.com,
	x86@...nel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86: Bypass legacy PIC and PIT on ACPI hardware reduced
 platform

> Besides, the "ACPI reduced hardware" case is kind of a red herring here,
> because it most likely is not the only case when we'll want has_8259_pic()
> to return 0 (quite likely, we'll want that on all BayTrail-based systems,
> for example).

No. Only those with ACPI reduced firmware. For others you do want to
touch the 8259.

It *is* about ACPI reduced.

Alan


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