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

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Message-ID: <CACi5LpM31cVtw1QKMaQXoc-Dq7twX_z-rZFth0WTGPHp2WJJCQ@mail.gmail.com>
Date:   Wed, 28 Feb 2018 16:02:16 +0530
From:   Bhupesh Sharma <bhsharma@...hat.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     Jonathan Toppins <jtoppins@...hat.com>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        Al Stone <astone@...hat.com>,
        Jonathan Masters <jcm@...hat.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>, rafael.j.wysocki@...el.com,
        Ingo Molnar <mingo@...nel.org>,
        Prarit Bhargava <prarit@...hat.com>,
        James Morse <james.morse@....com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64/acpi: make ACPI boot preference configurable

On Wed, Feb 28, 2018 at 3:37 PM, Andy Shevchenko
<andriy.shevchenko@...ux.intel.com> wrote:
> On Wed, 2018-02-28 at 00:29 +0530, Bhupesh Sharma wrote:
>> On Tue, Feb 27, 2018 at 8:14 PM, Jonathan Toppins <jtoppins@...hat.com
>> > 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?

Yes the patch in discussion is for arm64. So my comments above are in
context to arm64.

>>  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.

AFAIK upstream arm64 u-boot doesn't support ACPI boot method for
armv8/arm64 yet.

Regards,
Bhupesh