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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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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