Re: [Xen-devel] [RFC] ARM VM System Sepcification

[Rob Herring <rob.herring@xxxxxxxxxx>]

On Wed, Feb 26, 2014 at 2:22 PM, Arnd Bergmann <arnd@xxxxxxxx> wrote:
> On Wednesday 26 February 2014 12:05:37 Christoffer Dall wrote:
>> On Wed, Feb 26, 2014 at 08:55:58PM +0100, Arnd Bergmann wrote:
>> > On Wednesday 26 February 2014 10:34:54 Christoffer Dall wrote:
>>
>> The most common response I've been getting so far is that people
>> generally want their VMs to look close to the real thing, but not sure
>> how valid an argument that is.
>>
>> Some people feel strongly about this and seem to think that ARMv8
>> kernels will only work with ACPI in the future...
>
> That is certainly a misconception that has caused a lot of trouble.
> We will certainly keep supporting FDT boot in ARMv8 indefinitely,
> and I expect that most systems will not use ACPI at all.

Furthermore, even enterprise distro kernels will boot DT based kernels
assuming the h/w support is mainlined despite statements to the
contrary. It is a requirement in mainline kernels that DT and ACPI
support to coexist. Distros are not going to go out of their way to
undo/break that. And since the boot interface is DT, you can't simply
turn off DT. :)

Rob

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