#define MICROPY_HW_BOARD_NAME "Arduino MKR1300"
#define MICROPY_HW_MCU_NAME "samd21g18"

#define MICROPY_PORT_A        (0)
#define MICROPY_PORT_B        (0)
#define MICROPY_PORT_C        (0)

#define CIRCUITPY_INTERNAL_NVM_SIZE 0

#define BOARD_FLASH_SIZE (0x00040000 - 0x2000 - 0x010000)

#define DEFAULT_I2C_BUS_SCL (&pin_PA09)
#define DEFAULT_I2C_BUS_SDA (&pin_PA08)

#define DEFAULT_SPI_BUS_SCK (&pin_PA13)
#define DEFAULT_SPI_BUS_MOSI (&pin_PA12)
#define DEFAULT_SPI_BUS_MISO (&pin_PA15)

#define DEFAULT_UART_BUS_RX (&pin_PB23)
#define DEFAULT_UART_BUS_TX (&pin_PB22)

// USB is always used internally so skip the pin objects for it.
#define IGNORE_PIN_PA24     1
#define IGNORE_PIN_PA25     1

#define MICROPY_HW_BOARD_NAME "Arduino MKR1300"
#define MICROPY_HW_MCU_NAME "samd21g18"

#define MICROPY_PORT_A        (PORT_PA24 | PORT_PA25)
#define MICROPY_PORT_B        (0)
#define MICROPY_PORT_C        (0)

#include "internal_flash.h"

#define CIRCUITPY_INTERNAL_NVM_SIZE 0

#define BOARD_FLASH_SIZE (0x00040000 - 0x2000 - 0x010000)

#define DEFAULT_I2C_BUS_SCL (&pin_PA09)
#define DEFAULT_I2C_BUS_SDA (&pin_PA08)

#define DEFAULT_SPI_BUS_SCK (&pin_PA13)
#define DEFAULT_SPI_BUS_MOSI (&pin_PA12)
#define DEFAULT_SPI_BUS_MISO (&pin_PA15)

#define DEFAULT_UART_BUS_RX (&pin_PB23)
#define DEFAULT_UART_BUS_TX (&pin_PB22)

// USB is always used internally so skip the pin objects for it.
#define IGNORE_PIN_PA24     1
#define IGNORE_PIN_PA25     1

--- 
+++ 
@@ -1,11 +1,9 @@
 #define MICROPY_HW_BOARD_NAME "Arduino MKR1300"
 #define MICROPY_HW_MCU_NAME "samd21g18"
 
-#define MICROPY_PORT_A        (PORT_PA24 | PORT_PA25)
+#define MICROPY_PORT_A        (0)
 #define MICROPY_PORT_B        (0)
 #define MICROPY_PORT_C        (0)
-
-#include "internal_flash.h"
 
 #define CIRCUITPY_INTERNAL_NVM_SIZE 0
 
Update MKR1300 board definition too
