[U-Boot] standalone apps and their use of exported functions

[Valentin Ecker]

Hey there!

I am trying to customize/extend uboot with a standalone application  
which is automatically loaded before booting the kernel.
Is there any way i can safely access uboot functions besides the  
exported(include/exports.h) ones? e.g. functions that can be executed  
from the command line - like nand copy, saveenv,...

...Im really doing hard on finding some documentation about this  
subject.

thanks,
Valentin