LD_FILE = boards/samd21x18-bootloader.ld USB_VID = 0x2341 USB_PID = 0x8053 USB_PRODUCT = "Arduino MKR1300" USB_MANUFACTURER = "Arduino" INTERNAL_FLASH_FILESYSTEM = 1 LONGINT_IMPL = NONE CIRCUITPY_SMALL_BUILD = 1 CHIP_VARIANT = SAMD21G18A CHIP_FAMILY = samd21