I can't help with you palm. However I remember that there was a thread about this in this forum previously, so you may be able to find it in a search.
To see the boosplash, you have to use the correct 'vga=' and 'splash=silent' parameter in /boot/grub/menu.lst. Additionally, you may need to run 'mkinitrd -s 1024x768' to include the picture of the correct resolution into initrd.
Code:
| 640x480 800x600 1024x768 1280x1024
----+-------------------------------------
256 | 0x301 0x303 0x305 0x307
32k | 0x310 0x313 0x316 0x319
64k | 0x311 0x314 0x317 0x31A
16M | 0x312 0x315 0x318 0x31B