mcuboot/boot/boot_serial/syscfg.yml

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syscfg.defs:
    BOOT_SERIAL_DETECT_PIN:
        description: >
            Start the serial boot loader if this pin is asserted at boot time.
        value: '-1'
        restrictions:
            - '(BOOT_SERIAL_DETECT_PIN != -1) ||
               (BOOT_SERIAL_DETECT_TIMEOUT != 0) ||
               (BOOT_SERIAL_NVREG_INDEX != -1)'

    BOOT_SERIAL_DETECT_PIN_CFG:
        description: >
            GPIO configuration for the serial boot loader detect pin.
        value: 'HAL_GPIO_PULL_UP'

    BOOT_SERIAL_DETECT_PIN_VAL:
        description: >
            The value the detect pin must be set to for the serial boot loader
            to start.
        value: 0

    BOOT_SERIAL_DETECT_TIMEOUT:
        description: >
            The duration, in milliseconds, to listen on the UART for the
            management string (BOOT_SERIAL_DETECT_STRING).  If the management
            string is detected during this period, the serial boot loader is
            started.  If the period expires without the management string being
            received, the boot loader runs in the normal (non-serial) mode.
            Specify 0 to disable listening on the UART for the management
            string.
        value: 0
        restrictions:
            - '(BOOT_SERIAL_DETECT_PIN != -1) ||
               (BOOT_SERIAL_DETECT_TIMEOUT != 0) ||
               (BOOT_SERIAL_NVREG_INDEX != -1)'

    BOOT_SERIAL_DETECT_STRING:
        description: >
            The string to listen for on the UART.  If this management string is
            detected during the timeout period, the serial boot loader is
            started.  If the period expires without this string being received,
            the boot loader runs in the normal (non-serial) mode.  This setting
            has no effect if BOOT_SERIAL_DETECT_TIMEOUT is set to 0.
        value: '"nmgr"'

    BOOT_SERIAL_REPORT_PIN:
        description: >
            The GPIO to toggle while the serial boot loader is running.  Set to
            -1 to disable reporting.
        value: 'LED_BLINK_PIN'

    BOOT_SERIAL_REPORT_FREQ:
        description: >
            The toggle rate, in Hz, of the serial boot loader report pin.
        value: 4

    BOOT_SERIAL_NVREG_MAGIC:
        description: >
            Magic number, to be saved in a retained (reset-surviving) register.
            If the value in the register matches, the serial bootloader will
            load. Value must not be 0.
        value: 0xB7
        restrictions:
            - '(BOOT_SERIAL_NVREG_MAGIC != 0)'

    BOOT_SERIAL_NVREG_INDEX:
        description: >
            Index of retained register to use (using hal_nvreg_read) for reading
            magic value.
        value: -1
        restrictions:
            - '(BOOT_SERIAL_DETECT_PIN != -1) ||
               (BOOT_SERIAL_DETECT_TIMEOUT != 0) ||
               (BOOT_SERIAL_NVREG_INDEX != -1)'

    BOOT_SERIAL_MGMT_ECHO:
        description: If enabled, support for the mcumgr echo command is being added.
        value: 0