Hi @wizio,
I am working in SAMR34 development board . with platformIO with your firmware. I have used Arduino Platform. for SAMR34 Xplained PRO DM320111 (development board) Works great . and I have built the board with ATSAMR34J18 soc and upload the hex file of the platformio code. using J_LINK lite. I doesn’t work.
The problem I found here is BARMETAL code asf_blink hex is work fine in the custom board . but LED blink Arduino code for this board in not working when it is upload to custom board . But The same LED BLINK code is working in the development broad .