Load M4 firmware

[dry]

@LubOlimex:

 On the related note, is it possible to debug through JTAG that Cortex-M4 side? If I'm writing custom firmware.

I see JTAG lines, unsure if its same lines for all cores on this asmp chip? Anyone successfully debugged with JTAG (e.g. Segger, Olimex) that  M4 core?