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From:   Emil Renner Berthing <emil.renner.berthing@gmail.com>
Date:   Mon, 3 Jul 2023 20:58:04 +0200
Message-ID: <CANBLGcwcvK55dZ1__wvWCtcw=XoKt=qki8g6C_QYo+TBqqJ=TA@mail.gmail.com>
Subject: Re: [External] Re: [PATCH v2 1/3] riscv: obtain ACPI RSDP from FFI.
To:     =?UTF-8?B?6L+Q6L6J5bSU?= <cuiyunhui@bytedance.com>
Cc:     Andrew Jones <ajones@ventanamicro.com>, ardb@kernel.org,
        palmer@dabbelt.com, paul.walmsley@sifive.com,
        aou@eecs.berkeley.edu, linux-riscv@lists.infradead.org,
        rminnich@gmail.com, mark.rutland@arm.com, lpieralisi@kernel.org,
        rafael@kernel.org, lenb@kernel.org, jdelvare@suse.com,
        yc.hung@mediatek.com, angelogioacchino.delregno@collabora.com,
        allen-kh.cheng@mediatek.com, pierre-louis.bossart@linux.intel.com,
        tinghan.shen@mediatek.com, linux-kernel@vger.kernel.org,
        linux-acpi@vger.kernel.org, geshijian@bytedance.com,
        weidong.wd@bytedance.com
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On Mon, 3 Jul 2023 at 15:33, =E8=BF=90=E8=BE=89=E5=B4=94 <cuiyunhui@bytedan=
ce.com> wrote:
>
> Hi drew,
>
> On Mon, Jul 3, 2023 at 9:01=E2=80=AFPM Andrew Jones <ajones@ventanamicro.=
com> wrote:
> >
> >
> > (This is a reply to a non-existent cover letter.)
>
> This has been discussed many times with Ard, Please refer to :
> https://patches.linaro.org/project/linux-acpi/patch/20230426034001.16-1-c=
uiyunhui@bytedance.com/

Hi Yunhui,

From that discussion it was mentioned that that arm supports 3 methods
of booting:
  direct + devicetree
  EFI + devicetree
  EFI + ACPI
..but not
  direct + ACPI

To me it isn't obvious from that or this thread, and since arm seems
to be doing fine without the 4th option I'm curious why that's
necessary on riscv?

> > I'm not a big fan of adding yet another interface. Have you considered
> > doing something like [1]?
> >
> > [1] https://github.com/tianocore/tianocore.github.io/wiki/UefiPayloadPk=
g

Also you didn't answer this question, which I'd also like to hear a reply t=
o.

/Emil

> > Thanks,
> > drew
>
> Thanks,
> Yunhui
>
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