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

From: [email-masked] (H. Peter Anvin)
Date: Wed, 16 Jul 2014 16:49:12 -0700

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