linux-kernel - Re: [External] Re: [PATCH] firmware: added a firmware information passing method FFI

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Message-ID: <CAEEQ3wkJB5CKm33mHXUOPX5makYOHF8By6FYGnNzRkM-Mo72OQ@mail.gmail.com>
Date:   Wed, 26 Apr 2023 17:34:55 +0800
From:   运辉崔 <cuiyunhui@...edance.com>
To:     Ard Biesheuvel <ardb@...nel.org>
Cc:     Mark Rutland <mark.rutland@....com>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>, rafael@...nel.org,
        lenb@...nel.org, jdelvare@...e.com, cujomalainey@...omium.org,
        yc.hung@...iatek.com, angelogioacchino.delregno@...labora.com,
        allen-kh.cheng@...iatek.com, pierre-louis.bossart@...ux.intel.com,
        tinghan.shen@...iatek.com, linux-kernel@...r.kernel.org,
        linux-acpi@...r.kernel.org, rminnich@...il.com
Subject: Re: [External] Re: [PATCH] firmware: added a firmware information
 passing method FFI

Hi Ard,

On Wed, Apr 26, 2023 at 3:09 PM Ard Biesheuvel <ardb@...nel.org> wrote:
>
> Hello Yunhui,
>
> I am not sure this is a good idea: this is clearly intended for arm64,
> which cannot use ACPI without the EFI memory map, which it uses to
> cross reference memory opregion accesses, to determine the correct
> memory type attributes.
>
Not only for arm64, but also other arches, such as riscv.
For memory-related nodes, it will be done in the early scan of the device tree.


> What is the use case you are trying to accommodate here?
>
Some bootloaders do not support uefi, such as coreboot,
but need to support acpi, smbios.


Thanks,
Yunhui