The problem may be in the watara.c file or in one of the linked files. Could also be in the CPU emulation
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It can't be a linker issue, i'm rebuilding everything each time.
Watara.c has very little code and is unlikely to be the culprit.
The issue isn't the CPU core : i swapped the cpu core with the old one and there's no difference.
It does seem like it is an interrupt issue, which is harder to debug...