g++ -o makelogo makelogo.cpp

./makelogo > bootlogo

cat start_logo.h > logo_rgb24_wvga_portrait.h
cat bootlogo >> logo_rgb24_wvga_portrait.h
cat end_logo.h >> logo_rgb24_wvga_portrait.h

cp logo_rgb24_wvga_portrait.h  kernel/drivers/video/samsung/


If you wish to use a custom logo:

Use GIMP to create a 480x800 24bit RGB image.
Save as "C source code feader (*.h)"
edit makelogo.cpp to include the new image.