LD_FILE = boards/samd51x19-bootloader-external-flash.ld USB_VID = 0x239A USB_PID = 0x8021 USB_PRODUCT = "Feather M4 Express" USB_MANUFACTURER = "Adafruit Industries LLC" QSPI_FLASH_FILESYSTEM = 1 CHIP_VARIANT = SAMD51J19A CHIP_FAMILY = samd51