That's about SeaBIOS' bootsplash feature not coreboot's ;)
coreboot has it's own (probably not used in 10 years)
version that works only with VBIOS and a VBE mode. So by
default the VBE mode is only set for that and coreboot
would return to text mode before booting the payload
(unless configured otherwise, VBE_LINEAR_FRAMEBUFFER,
IIRC).

Sorry for a late reply. coreboot bootsplash does not support BMP, only JPG, so I made a JPG image using these commands:

convert $image -resize 1024x768! ./bootsplash.jpg
mogrify -density 72x72 -units PixelsPerInch ./bootsplash.jpg

(taken from https://github.com/g0tmi1k/os-scripts/blob/master/backtrack5r3.sh , line 212)

Then I tried it with coreboot by enabling the relevant configs, but - despite I see some bootsplash-related coreboot prints in cbmem log - my coreboot is still not showing this image, although SeaBIOS is showing it. To make sure it's coming from SeaBIOS, I just built a version of SeaBIOS without a bootsplash support, and now couldn't see this image. Even when I enabled the max debug level + FT232H debug dongle to significantly prolong the boot time, still couldn't see.

> If you ask me, we could just remove that feature from
coreboot.

Maybe this feature is working for someone else, and by the way I'd like to see more features added to coreboot, not removed ;)

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