linux-kernel - Re: [PATCH v4 0/2] DMI: Scan for DMI table from DTS info

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Message-ID: <CAMj1kXGUyzPQu14SOBs8GSsJ3+ASssNR1vCN5T8OzeEbXdBbBQ@mail.gmail.com>
Date: Fri, 31 Oct 2025 11:17:31 +0100
From: Ard Biesheuvel <ardb@...nel.org>
To: adriana <adriana@...sta.com>
Cc: ilias.apalodimas@...aro.org, trini@...sulko.com, robh@...nel.org, 
	krzk@...nel.org, jdelvare@...e.com, frowand.list@...il.com, 
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org, vasilykh@...sta.com, 
	arm.ebbr-discuss@....com, boot-architecture@...ts.linaro.org, 
	linux-efi@...r.kernel.org, uefi-discuss@...ts.uefi.org, 
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v4 0/2] DMI: Scan for DMI table from DTS info

On Fri, 31 Oct 2025 at 11:10, adriana <adriana@...sta.com> wrote:
>
> Some bootloaders like U-boot, particularly for the ARM architecture,
> provide SMBIOS/DMI tables at a specific memory address. However, these
> systems often do not boot using a full UEFI environment, which means the
> kernel's standard EFI DMI scanner cannot find these tables.
>
> This series adds support for the kernel to find these tables by
> reading the associated property from the Device Tree /chosen node. The
> bootloader can specify the physical addresses using the property
> "linux,smbios3-entrypoint".
>
> The first patch introduces the device tree binding documentation for this
> new ABI, and the second patch implements the driver logic in dmi_scan.c.
>
> Changes in v4:
>   - Renamed linux,smbios3-table.yaml file, removed mention of ARM/ARM64
>     (Patch 1/2).
>   - Drop the second definition of dmi_scan_from_dt() and fold checking
>     for CONFIG_OF (Patch 2/2).
>   - Drop unnecessary goto on the success case (Patch 2/2).
>   - Replace magic number for entrypoint size with SMBIOS3_ENTRY_POINT_SIZE
>     definition (Patch 2/2).
>
> Changes in v3:
>   - Removed linux,smbios-table property, only keep the SMBIOSv3 property
>     (Patch 1/2).
>   - Search DT for linux,smbios3-table only, removed the code searching
>     for the previous property (Patch 2/2).
>
> Changes in v2:
>   - Add missing Device Tree binding documentation (Patch 1/2).
>   - Split the original patch into a 2-part series (binding + driver).
>   - (No functional changes to the driver code in patch 2/2).
>
> adriana (2):
>   dt-bindings: firmware: Add binding for SMBIOS /chosen properties
>   drivers: firmware: dmi_scan: Add support for reading SMBIOS from DT
>

For the series,

Reviewed-by: Ard Biesheuvel <ardb@...nel.org>

I can take the second patch, but bindings need to go in separately IIRC.

Rob?


>  .../firmware/linux,smbios3-entrypoint.yaml    | 25 +++++++++
>  drivers/firmware/dmi_scan.c                   | 54 +++++++++++++++++++
>  2 files changed, 79 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/firmware/linux,smbios3-entrypoint.yaml
>
> --
> 2.51.0
>