linux-kernel - Re: [Linaro-acpi] [PATCH v7 04/17] ARM64 / ACPI: Introduce early_param for "acpi" and pass acpi=force to enable ACPI

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Message-ID: <54CA7D4A.5090709@codeaurora.org>
Date:	Thu, 29 Jan 2015 12:34:50 -0600
From:	Timur Tabi <timur@...eaurora.org>
To:	Ard Biesheuvel <ard.biesheuvel@...aro.org>
CC:	Catalin Marinas <catalin.marinas@....com>,
	Mark Rutland <Mark.Rutland@....com>,
	Rob Herring <robh@...nel.org>,
	"phoenix.liyi@...wei.com" <phoenix.liyi@...wei.com>,
	Robert Richter <rric@...nel.org>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	Arnd Bergmann <arnd@...db.de>,
	"linaro-acpi@...ts.linaro.org" <linaro-acpi@...ts.linaro.org>,
	Marc Zyngier <Marc.Zyngier@....com>,
	Will Deacon <Will.Deacon@....com>,
	Randy Dunlap <rdunlap@...radead.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	lkml <linux-kernel@...r.kernel.org>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>,
	"wangyijing@...wei.com" <wangyijing@...wei.com>,
	Mark Brown <broonie@...nel.org>,
	"hanjun.guo@...aro.org" <hanjun.guo@...aro.org>,
	"jcm@...hat.com" <jcm@...hat.com>, Olof Johansson <olof@...om.net>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Jason Cooper <jason@...edaemon.net>
Subject: Re: [Linaro-acpi] [PATCH v7 04/17] ARM64 / ACPI: Introduce early_param
 for "acpi" and pass acpi=force to enable ACPI

On 01/29/2015 12:28 PM, Ard Biesheuvel wrote:
> The UEFI stub in the kernel uses the DTB file format (FDT) to pass
> information about the UEFI memory map and system table to the kernel.
> It does so even if there is no device tree that describes the
> platform. In this case, the file only contains a /chosen DT node, and
> nothing else, and it is up to the kernel to figure out that it can ask
> UEFI for a set of ACPI tables that it can use instead to configure the
> system. Otherwise, the /chosen node properties are added to a device
> tree that contains the full platform description.
>
> The problem is that we have to decide how to distinguish a
> conventional device tree DTB from a DTB that only exists to
> communicate the UEFI entry points.

Ah, that's exactly what I'm seeing.  The UEFI stub in our kernel 
generates a DTB, and therefore I always need to put acpi=force on our 
kernel command line.

-- 
Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the
Code Aurora Forum, a Linux Foundation Collaborative Project.
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