Serial recovery selected without an entrance mode set

[IvanR]

Im following Lesson 8 Exercise 2 – DFU over USB.

My project is in its late stage and now I tried to add DFU over USB but Im getting 
#error "Serial recovery selected without an entrance mode set", or devicetree error: /aliases: undefined node label 'button0'

I dont have leds on my custom board but I do have a button defined as 

  buttons {

    compatible = "gpio-keys";

    button1: button_1 {

      gpios = <&gpio1 13 (GPIO_PULL_UP | GPIO_ACTIVE_LOW)>;

    };

  };

Regards,

[Priyanka]

Hi Ivan,

Have you enabled the proper Kconfigs in your prj.conf for the serial recovery mode?

Also, in case you are only using one button, please change your dts definition for button1 to button0 and add the alias for it

buttons {
compatible = "gpio-keys";
button0: button_0 {
gpios = <&gpio1 13 (GPIO_PULL_UP | GPIO_ACTIVE_LOW)>;
label = "Button 0";
};
}

{
aliases {
button0 = &button0;
};
};

-Priyanka

[IvanR]

Is button needed for DFU over USB ? I see its needed for DFU over UART but not USB ?

[Priyanka]

Button is not necessarily required for DFU over USB.

[IvanR]

I changed my defenition to button0 regardles (it looks cleaner)

but Im constantly getting "Serial recovery selected without an entrance mode set". on compile 

[IvanR]

I commented out some other options in mcuboot.conf (CONFIG_GPIO=n could have been the culprit) 

and now it compiles. but now im getting NMP timeout