linux-kernel - Re: [PATCH v2 1/3] ACPI: ARM64 does not have a BIOS add config for BIOS table scan.

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Date:	Wed, 16 Jul 2014 16:49:12 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	"Luck, Tony" <tony.luck@...el.com>,
	Hanjun Guo <hanjun.guo@...aro.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>
CC:	Catalin Marinas <catalin.marinas@....com>,
	Graeme Gregory <graeme.gregory@...aro.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linaro-acpi@...ts.linaro.org" <linaro-acpi@...ts.linaro.org>
Subject: Re: [PATCH v2 1/3] ACPI: ARM64 does not have a BIOS add config for
 BIOS table scan.

On 07/16/2014 04:46 PM, Luck, Tony wrote:
>> +	select ACPI_LEGACY_TABLES_LOOKUP if ACPI
> 
>> This shouldn't actually be set on IA64, should it?  IA64 doesn't have
>> BIOS, either, it has EFI/UEFI, like ARM64...
> 
> Which ACPI tables are in the "LEGACY" category affected by this option?
> 

That's not what this is about... it is about how you find the root pointer.

On a BIOS system it is found by scanning low memory.  On an EFI system
it is found by querying EFI for a specific UUID.

	-hpa



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