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Re: [Qemu-arm] [Qemu-devel] [PATCH v2] ARM: Virt: Don't generate RTC ACP

From: Shannon Zhao
Subject: Re: [Qemu-arm] [Qemu-devel] [PATCH v2] ARM: Virt: Don't generate RTC ACPI device when using UEFI
Date: Fri, 15 Jan 2016 22:37:25 +0800
User-agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:31.0) Gecko/20100101 Thunderbird/31.7.0

On 2016/1/15 22:34, Peter Maydell wrote:
On 13 January 2016 at 16:26, Laszlo Ersek<address@hidden>  wrote:
>On 01/13/16 17:16, Andrew Jones wrote:
>>On Wed, Jan 13, 2016 at 10:54:17PM +0800, Shannon Zhao wrote:
>>>When booting the VM with UEFI, UEFI takes ownership of the RTC hardware.
>>>While UEFI can use libfdt to disable the RTC device node in the DTB that
>>>it passes to the OS, it cannot modify AML. Therefore, we won't generate
>>>the RTC ACPI device at all when using UEFI.
>>I think a condensed comment similar to this commit message would be nice
>>in build_dsdt, or somewhere. We have a policy for mach-virt of generating
>>ACPI for everything we generate DT. It'd be good if we documented all the
>>divergences in order to avoid confusion. [...]
>Good idea!
I'm happy with the code in this patch, so you can add my
Reviewed-by: Peter Maydell<address@hidden>

Sorry, missed this. I've sent the v3.

Shannon, I'm assuming you're planning a v3 with the comment that
Andrew and Laszlo suggest.


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