> So basically I can use any available data banks and join them together?

I don't remember what you are trying to do, but you can make a linker memory
region that spans multiple banks.

> Which bank is used by default (udata),

None.

> is there no danger that one of
> those banks begining with grpxx will be used by udata and I will have
> overlapping  variables, or is this fool proof?

Yes, I think, depending on whatever GRPXX is supposed to be.


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