On 10/27/25 11:28 AM, Maxime Ripard wrote:
On Mon, Oct 27, 2025 at 11:01:55AM -0500, Mario Limonciello wrote:
On 10/27/25 7:35 AM, Thomas Zimmermann wrote:
- a very simple progress bar, which can be driven through sysfs;
Once you have options to control these settings from user space, you
should do it in user space entirely. As Maxime suggested, please improve
plymouth for anything with animation.
- a static image (optional).
Board vendors often provide an image, see /sys/firmware/acpi/bgrt/. This
is a candidate for display, or the penguin or a custom image. Please
make it configurable by Kconfig. Again, if you need policy and
heuristics for deciding what to display, you better do this in user
space.
I'd actually argue that the static image from BGRT should be the preferred
priority. This can make for a nice hand off to Plymouth.
The (UEFI) BIOS already will show this image as soon as the GOP driver is
loaded. Bootloaders like GRUB by default will avoid showing anything or
will overwrite with the exact same image in the same location. This can let
the kernel do the same, and then the moment Plymouth takes over it could do
the same.
And BGRT isn't typically found on embedded systems at all, so I'm not
sure it's a sensible default, let alone a priority. At most a possible
There are certainly embedded machines using UEFI and that have a BGRT.
How about "Sensible default the top of the priority list if it exists"
Just like Plymouth will start out with graphical splash and fallback to
text if problems.
