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:	Thu, 17 Jul 2014 11:18:06 +0800
From:	Hanjun Guo <hanjun.guo@...aro.org>
To:	"H. Peter Anvin" <hpa@...or.com>,
	"Luck, Tony" <tony.luck@...el.com>,
	"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 2014-7-17 7:49, H. Peter Anvin wrote:
> 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...

Yes, I agree with you, thanks for pointing this out. if I remember
correctly, the EFI standard was introduced when IA64 came out.

>>
>> 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.

Thanks for the explanation.

Tony, if it is ok with you, I will modify the patch and will not select
ACPI_LEGACY_TABLES_LOOKUP on IA64, I'm waiting for your final confirmation.

Thanks
Hanjun
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