guentherweber

Results 4 issues of guentherweber

add multicore support gdb debugging Arm Cortex M

add SAMD20 perpherals and ATSAMD20_XPRO Board, tested with zephyr shell program

-supports Microchip SAM D20 CPU with various peripherals - NVIC - FLASH - SYSTICK - GPIO - USART

adding peripherals for SAMD20 controller