[SeaBIOS] Get a working bootsplash.bmp BMP splashscreen for SeaBIOS with this ImageMagick command

[Mike Banon]

Why BMP? It's a lossless image format which could be LZMA compressed
quite well depending on the image's variety of colours. And finally I
found out how to get a working splash screen - instructions tested on
AMD Lenovo G505S laptop with 1366x768 screen resolution :

1) Install the ImageMagick package, it has a "convert" tool.
2) Find a cool image, preferably in a lossless format like PNG
(certainly not a lossy JPEG!), resize it to your screen resolution -
e.g. to 1366x768 in this particular case - and save it, preferably as
PNG.
3) Now you could convert this image into BMP format recognizable by SeaBIOS:

convert ./wallpaper.png -alpha set -verbose -depth 32 ./bootsplash.bmp

4) Then add it to your coreboot.rom image, with LZMA compression of
course - because without a compression those BMPs are too large:

./coreboot/build/cbfstool ./coreboot/build/coreboot.rom add -f
~/Downloads/bootsplash.bmp -n bootsplash.bmp.lzma -t raw -c lzma

5) And finally flash the updated image, e.g. at G505S it could be
flashed internally:

sudo ./flashrom/flashrom -p
internal:laptop=force_I_want_a_brick,amd_imc_force=yes -w
./coreboot/build/coreboot.rom

Hope it's helpful!

Best regards,
Mike Banons
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