How do I change boot animation for android?

[kbungo]

Or simply go to the root of kernel you replace the 2 logos "Tinker Board" by yours and you rename them logo.bmp and logo_kernel.bmp you keep well both.

If you want a static logo.

Leskriim is right. replace them in the kernel directory since the uboot one doesn't actually display. Recompile kernel afterwards.

Make sure the image you use is a bmp and is Runlength encoded with the colour information written into the header. This can be done via GIMP when exporting to a bmp. It took me like a couple weeks of kernel compiles to get something that was the right size, colour and resolution. Be patient and keep working on it. Use as small of a colour space as possible.