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