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Re: [Qemu-devel] [PATCH] hw/arm/virt-acpi-build: _CCA attribute is compu


From: Peter Maydell
Subject: Re: [Qemu-devel] [PATCH] hw/arm/virt-acpi-build: _CCA attribute is compulsary
Date: Tue, 3 Nov 2015 13:26:15 +0000

On 3 November 2015 at 09:08, Shannon Zhao <address@hidden> wrote:
>
>
> On 2015/11/3 16:31, Graeme Gregory wrote:
>>
>>
>> On Tue, 3 Nov 2015, at 02:25 AM, Shannon Zhao wrote:
>>> Hi Graeme,
>>>
>>> On 2015/11/2 18:39, Graeme Gregory wrote:
>>>> According to ACPI specification 6.2.17 _CCA (Cache Coherency Attribute)
>>>> this attribute is compulsary on ARM systems. Add this attribute to
>>>> the PCI host bridges as required.
>>>>
>>>
>>> To ACPI 5.1 this object is not compulsory and if not supplied it has
>>> default value for it. But to ACPI 6.0 it must be supplied on ARM systems.
>>> Regarding this change, ACPI 6.0 fixes 5.1 for this object, right?
>>>
>>
>> Hi Shannon, the wording in ACPI 5.1 is "On ARM based systems, the _CCA
>> object must be supplied all such devices."
>>
>> So is not functionally different from 6.0.
>>
> Oh, I see. It's updated by 5.1 Errata 1189.
>
> Reviewed-by: Shannon Zhao <address@hidden>



Applied to target-arm.next, thanks.

-- PMM



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