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: <54CA7F94.6000305@redhat.com>
Date:	Thu, 29 Jan 2015 13:44:36 -0500
From:	Jon Masters <jcm@...hat.com>
To:	Timur Tabi <timur@...eaurora.org>,
	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>,
	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 01:34 PM, Timur Tabi wrote:
> 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.

I expect some of the distros to patch ACPI always enabled. So from my
point of view this affects only those wanting to follow upstream.

Jon.

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