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Unintuitively, the BGRT graphic is apparently meant to be usable if the valid bit in not set. The valid bit only conveys uncertainty about the validity in relation to the screen state. Windows 10 actually uses the BGRT image for its boot screen even if not 'valid', for example when the user triggered the boot menu. Because it is unclear if all firmwares will provide a usable graphic in this case, we now look at the BMP magic number as an additional check. Reviewed-by: Josh Triplett <josh@joshtriplett.org> Signed-off-by: Môshe van der Sterre <me@moshe.nl> Signed-off-by: Matt Fleming <matt@codeblueprint.co.uk> Cc: =?UTF-8?q?M=C3=B4she=20van=20der=20Sterre?= <me@moshe.nl> Link: http://lkml.kernel.org/r/1454364428-494-10-git-send-email-matt@codeblueprint.co.uk Signed-off-by: Ingo Molnar <mingo@kernel.org> |
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