Having a problem with an out of the box setup for STM32F4

[Sebastian Huber]

On 11/08/2021 18:22, Mr. Andrei Chichak wrote:
> On 2021-August-11, at 01:06, Sebastian Huber<sebastian.huber at embedded-brains.de>  wrote:
>> On 10/08/2021 23:48, Mr. Andrei Chichak wrote:
>>>  From what I can figure out, there seems to be a problem with the out-of-the-box build of newly that the STM32F4 uses.
>>> memset() goes for a few ARM instructions and then seems to intentionally branch into, what the map file indicates is, the middle of fflush().
>> When does this happen, during the system start or later?
> This is happening at startup.
> 
> bsp_start_hook_1 calls bsp_start_copy_sections and the required sections are copied properly. I can trace this code and watch the regions get copied when needed.
> 
> bsp_start_hook_1 then calls bsp_start_clear_bss (in start.h) which calls memset with a valid pointer and size, but within a few instructions my processor (STM32F407G-DISC1 board) has, according to the stack, gone through rtems_fatal, _Terminate, all the way down to items_putc, and the bus doesn’t get cleared.

Is the memory of the memset() initialized? Is it the right area? Does it 
overlap the stack?

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