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payloads/tianocore/Kconfig: Extend help for bootsplash file 

Add more detail as to why a smaller-than-screen-size image is to be
preferred, in contrast to other payloads' bootsplash images.

Signed-off-by: Felix Friedlander <felix@ffetc.net>
Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
Change-Id: Ib4c6666bb0e49369fe8fe2ae3dc12c023f668da0
Reviewed-on: https://review.coreboot.org/c/coreboot/+/49233
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
This commit is contained in:
Felix Friedlander 2021-01-08 16:37:40 +11:00 committed by Martin Roth
parent ca1851dc1c
commit 45ce84113e
1 changed files with 12 additions and 2 deletions
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14
payloads/external/tianocore/Kconfig vendored
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@ -76,8 +76,18 @@ config TIANOCORE_BOOTSPLASH_FILE
default "bootsplash.bmp"
help
The path and filename of the file to use as graphical bootsplash
screen. The file format must be uncompressed BMP, and the file's
resolution must be less than the native resolution of the display.
image. The file must be an uncompressed BMP.
This image will also be used as the BGRT boot image, which may
persist through your OS boot process, and will be displayed
vertically centered 38.2% from the top of the display.
See ACPI spec 6.3, 5.2.22 Boot Graphics Resource Table (BGRT), and
Microsoft's documentation on BGRT positioning:
Docs/Windows/Windows Drivers/Bring up guide/Boot screen components
Accordingly, the image used should be no taller/wider than 40% of
the display panel's native pixel height/width (or resolution set).
If an absolute path is not given, the path will assumed to be
relative to the coreboot root directory.