What is TEXT_BASE?

[Norbert Roos]

Hello,

I'm just trying to build barebox for the first time, for processor OMAP4 
and board Phytec phycore pcm049.

Now i have to enter something for "TEXT_BASE", what should i select?

And in general, are there some important settings beside selecting the 
processor and board, or are the default values good for the first try?

bye
Norbert