Re: [PATCH] arm64/acpi: make ACPI boot preference configurable

[Andy Shevchenko]

On Wed, 2018-02-28 at 00:29 +0530, Bhupesh Sharma wrote:
> On Tue, Feb 27, 2018 at 8:14 PM, Jonathan Toppins <jtoppins@xxxxxxxxxx
> > wrote:
> > On 02/27/2018 07:40 AM, Bhupesh Sharma wrote:
> > > 

> > For arm64 DT is suppose to *not* be the preferred method, yet still
> > DT
> > is preferred if the firmware provides both tables to the kernel.

> However several arm64 products in embedded applications are still not
> SBSA/SBBR compliant (and I have worked on a couple of such
> implementations earlier) and still use bootloaders like u-boot (and
> also closed-source implementations) which have no support for ACPI
> currently and still rely on a DT to pass the system hardware
> information to the kernel.

> So far only open source implementation of a ACPI compliant firmware is
> EDK2/UEFI which supports ACPI as the preferred boot method

You mean for non-x86?

>  and I am
> not sure if all u-boot/in-house firmware implementations are planned
> to be ported over to EDK2/UEFI for embedded applications.

Why do you need that? ACPI (if you are talking about ACPI only, w/o EFI)
is supported in U-Boot for few x86 SoCs/platforms. Moreover, one of them
had never been shipped with ACPI/EFI complaint services in firmware and
ACPI layer is purely done in U-Boot.

-- 
Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
Intel Finland Oy