Hi,

We have just rechecked the latest toolchain with another Cortex M3 MCU (STM32F100VB) and could not reproduce the problem, so the fault is not caused by ARM vs Thumb problem.

In order to pinpoint the problem, please use the call stack window together with the disassembly view to find a specific instruction that causes the fault. If this is not helpful, open the Disassembly view before stepping into __libc_init_array() and then step into it, doing one instruction at a time until the fault occurs. If the fault happens on a memory accessing instruction, please check the address used in that instruction. If it is outside the FLASH/RAM ranges, something got wrong with the memory map (e.g. a bug in the linker script or a wrong address somewhere).