dietsche (./1) :
today i started to understand how ld-tigcc is constructed and added in a -flash-app switch, but I have a lot of learning to do....

Good luck. It isn't an easy program to understand. Don't forget to read ALSO the start up sections in tigcclib.a.
By the way, as TI mentionned you may need to link with another tigcclib.a than the standard one.
One that separate BSS section for data and TEXT section for code.
You can also see what I have done for integrating the BSS sections into the Flash OS switch.