Gensplash

Links
http://gentoo-wiki.com/HOWTO_Framebuffer_Support

http://gentoo-wiki.com/HOWTO_gensplash

Install
vga=0x031b => (1280x1024-24) vga=0x318 => (1024x786-24)

Find the required video mode for your resolution
Can't find the required video mode for your resolution (vesafb)?

Discover allowed vga modes for x86
Modes in square brackets are listed in decimal. Convert do hexadecimal (here), (280 = 0x118) and add 0x200 (0x318), pass the result to your kernel using vga=0x318.

Links
http://dev.gentoo.org/~spock/projects/uvesafb/