Re: [PATCH v2 0/6] Boot logo supplied by the device tree

[Rob Herring <robh@kernel.org>]

On Wed, Aug 05, 2026 at 12:56:11AM +0200, Max Pedraza wrote:
> This series lets the logo be described by the device tree instead: a node
> compatible with "linux,boot-logo-clut224" under /chosen supplies the image in
> the same paletted format the built-in CLUT224 logos already use, and the kernel
> prefers it over the built-in ones when it is present and enabled. If the
> node is absent or disabled, nothing changes.

Why is this linux specific? Don't people want to do a splash screen in 
u-boot or other firmware?

> 
> The image can come from the node itself (patches 1-2) or from a reserved
> memory region the bootloader filled in (patches 4-5), because the image and
> its placement are independent axes of variation. One board sold to several
> customers wants several device trees differing in the logo. One customer
> with several products built on that board, with different panels, wants the
> same logo placed differently on each: there the image belongs in a shared
> binary and only the placement belongs in the device tree. Patch 3 adds that
> placement.
> 
> We have been carrying a cruder version of this downstream on an AM335x
> product since 2020, across a handful of board revisions, and it has removed
> a real maintenance burden for us. This is an attempt to find out whether
> something along these lines is wanted upstream, and if so in what shape --
> hence RFC.
> 
> The v1 discussion turned on the obvious objection, that a bitmap is not
> hardware and the device tree is not where it belongs. Geert pointed out that
> configuration which is not hardware description goes under /chosen, and that
> Open Firmware, which the device tree descends from, already carried a boot
> logo in that spirit as the oem-logo variable under /options. The node has
> moved to /chosen accordingly, which is also where simple-framebuffer nodes
> live, for the same reason: they describe what firmware handed over rather
> than what the hardware is.

What does /options/oem-logo look like? Why can't that be used?

> Patches 4 and 5 are separable; the series is useful without them if the
> reserved memory path is thought to be one mechanism too many.

If you are going to put it in memory, why not just draw it into the 
simple-framebuffer?

Rob