Which parts of the binary blob are actually needed?

[Bernhard Rosenkraenzer]

I've just had a look at the "full" openjdk release -- and noticed the binary 
blob is just about the size of the full jdk. I'm assuming it contains some 
unnecessary bits (e.g. bits that will be replaced with components that are 
built during the openjdk build process, such as the "java" and "javac" 
executables).

What parts of the blob actually make it to the final build? (And has anyone 
checked if they can be replaced with components from any of the free JDK 
reimplementations?)

Regards,
bero