printf Problem with custom Board and NIOS II

Maybe I experienced the same problem. I found out that my generated linker description file (generated.x - folder "debug/system_description" in the syslib project) was wrong (some bug?). The .exception section pointed to system_memory_s2 and therefore overlapped some code section. Whenever an interrupt occurs (printf) the processor hangs up.

.exceptions :

{

. = ALIGN(0x20);

*(.irq)

KEEP (*(.exceptions));

} > system_memory_s1 <<<<<<<<< was wrong

Hope that you can solve your problem in the same way.

ps: keep in mind that generated.x will be automatically overwritten on syslib rebuilds.