[PATCH] arm64: Add CMDLINE_EXTEND

[Geoff Levand]

Hi Will,

On 12/06/2016 04:20 AM, Will Deacon wrote:
> On Mon, Dec 05, 2016 at 09:41:06AM -0800, Geoff Levand wrote:
>> On 12/05/2016 04:08 AM, Catalin Marinas wrote:
>>> On Fri, Dec 02, 2016 at 02:17:02PM -0800, Geoff Levand wrote:
>>>> The device tree code already supports CMDLINE_EXTEND,
>>>> so add the config option to make it available on arm64.
>>>
>>> What's your use-case for this patch? Note that both CMDLINE_FORCE and
>>> CMDLINE_EXTEND (if we introduce it) are ignored by the EFI stub.
>>> However, we don't seem to have stated this anywhere.
>>
>> I use this in CoreOS, where we need to set "acpi=force" for
>> arm64.  CoreOS uses a proper UEFI + grub.
> 
> So why can't you just set that in grub if you want to boot with ACPI?

That is how I originally did it, but it was suggested I
do it in the kernel config.  See:

  https://github.com/coreos/scripts/pull/610

Is there any reason why we don't want arm64 to have
CMDLINE_EXTEND?

-Geoff