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Cross Module Optimization crash

Hi all,

I have a strange problem with Cross Module Optimization.

I use the LPC2300 Keil EV Board.

If I compile the project in thumb mode it works all fine, but in Arm Mode it will crash!!

After 2 Days searching I found in the Disassembly window.

The Linker has overwritten the RTX Library 200 Bytes with my code in some places.

So that some RTX Functions did not work correct

My Question IS:

What does the Cross Module Optimization makes??

Is there any problem known.