initial port to stm32f4-discovery (cortex-m4)

[Dmitry Shapovalov]

hi

I not quite understand this code in irq.c:

memcpy(&stm32f4_vector_table [0], (void *) 0, sizeof(stm32f4_vector_table));
  _ARMV7M_SCB->vtor = &stm32f4_vector_table [0];


it copies the interrupt table from 0 to our structure and then sets a new
interrupt table address. this is the right place to do it? do we really need to
do it at all? without it the system hangs on the first call to sleep. I
think because the timer interrupt stops working.

With Best Regard.

Dmitry Shapovalov
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