After I packaged fbsplash, the author Jean-Damien.Durand@cern.ch released an update, and I tried, it works!
Now just need make change to grub menu.lst kernel command line, and then use mkinitramfs instead of mkinitrd and all the things are ready.
Kernel command line:
video=vesafb:ypan,1024x768-32 splash=silent,theme:tld quiet CONSOLE=/dev/tty1
