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{lib, drivers/intel}: Add splash screen footer

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This commit introduces the `SPLASH_SCREEN_FOOTER` Kconfig option,
enabling a custom footer image or logo on the firmware splash screen.
This provides an additional branding opportunity for device
manufacturers.

`soc_load_logo_by_coreboot()` now conditionally loads and renders
`footer_logo.bmp` when this option is enabled. The footer logo is
positioned at the bottom of the screen.

A new `SPLASH_SCREEN_FOOTER_LOGO_PATH` Kconfig option is added to
define the footer logo's file path. It defaults to a mainboard-specific
location. `Makefile.mk` is updated to ensure this logo is included in
the CBFS.

This additional branding is made possible by rendering bitmaps using
coreboot's native implementation (`USE_COREBOOT_FOR_BMP_RENDERING`).
FSP currently lacks the necessary callbacks to support this feature.

Currently, the OEM footer branding will appear even when the
system is booting in low-battery mode. A planned update will fix this
by exiting early from the boot process, preventing the footer from
showing and conserving power.

BUG=b:423591644
TEST=Able to display custom footer logo on boot.

Change-Id: I57f8af910e8b8f56e8a4a88f8cca6d60fad380b6
Signed-off-by: Subrata Banik <subratabanik@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/88029
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Kapil Porwal <kapilporwal@google.com>
This commit is contained in:
Subrata Banik 2025-06-10 19:29:56 +05:30
commit 4373eea5d8
5 changed files with 42 additions and 1 deletions
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2
src/include/bootsplash.h
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@ -10,6 +10,8 @@ enum bootsplash_type {
BOOTSPLASH_LOW_BATTERY,
/* Indicates a Main OEM defined bootsplash logo for center of the splash screen. */
BOOTSPLASH_CENTER,
/* Indicates an optional OEM defined bootsplash logo for footer of the splash screen. */
BOOTSPLASH_FOOTER,
/* It's used to determine the total number of bootsplash types. */
BOOTSPLASH_MAX_NUM,