Serial Recovery never works with remapping using FT232, ncs2.4.0

Question

Hi,

I am following the tutorial to implement the serial recovery on nrf52840DK https://academy.nordicsemi.com/courses/nrf-connect-sdk-intermediate/lessons/lesson-8-bootloaders-and-dfu-fota/topic/exercise-1-dfu-over-uart/

It works with the default setting, but when I added an overlay to remap to other pinouts and then connect with FT232 to linux, it never worked with the following line, NMP timeout.

mcumgr --conntype serial --connstring='dev=/dev/ttyUSB0,baud=115200' imag
e list

But it always worked with the following, no matter how I chose the uart

mcumgr --conntype serial --connstring='dev=/dev/ttyACM0,baud=115200' imag
e list

overlay:

&pinctrl {
	mcumgr_uart_default: mcumgr_uart_default {
        group1 {
			psels = <NRF_PSEL(UART_TX, 1, 2)>;//, 29
				//<NRF_PSEL(UART_RTS, 0, 27)>;
		};
		group2 {
			psels = <NRF_PSEL(UART_RX, 1, 1)>;//, 28
				//<NRF_PSEL(UART_CTS, 0, 26)>;
			bias-pull-up;
		};
	};

	mcumgr_uart_sleep: mcumgr_uart_sleep {
		group1 {
			psels = <NRF_PSEL(UART_TX, 1, 2)>, //29
				<NRF_PSEL(UART_RX, 1, 1)>;//, 28
				//<NRF_PSEL(UART_RTS, 0, 27)>,
				//<NRF_PSEL(UART_CTS, 0, 26)>;
			low-power-enable;
		};
	};
};

&uart0 {
	compatible = "nordic,nrf-uarte";
	//current-speed = <1000000>;
    current-speed = <115200>;
	status = "okay";
	pinctrl-0 = <&mcumgr_uart_default>;
	pinctrl-1 = <&mcumgr_uart_sleep>;
	pinctrl-names = "default", "sleep";
	//hw-flow-control;
};

&spi1 {
	status = "disabled";
};

&i2c0 {
	status = "disabled";
};

/ {
	chosen {
		zephyr,uart-mcumgr = &uart0;
	};
};

I used the following uart1 setting as well, but still not working

&pinctrl {
	mcumgr_uart_default: mcumgr_uart_default {
        group1 {
			psels = <NRF_PSEL(UART_TX, 1, 2)>;//, 29
				//<NRF_PSEL(UART_RTS, 0, 27)>;
		};
		group2 {
			psels = <NRF_PSEL(UART_RX, 1, 1)>;//, 28
				//<NRF_PSEL(UART_CTS, 0, 26)>;
			bias-pull-up;
		};
	};

	mcumgr_uart_sleep: mcumgr_uart_sleep {
		group1 {
			psels = <NRF_PSEL(UART_TX, 1, 2)>, //29
				<NRF_PSEL(UART_RX, 1, 1)>;//, 28
				//<NRF_PSEL(UART_RTS, 0, 27)>,
				//<NRF_PSEL(UART_CTS, 0, 26)>;
			low-power-enable;
		};
	};
};

&uart1 {
	compatible = "nordic,nrf-uarte";
	//current-speed = <1000000>;
    current-speed = <115200>;
	status = "okay";
	pinctrl-0 = <&mcumgr_uart_default>;
	pinctrl-1 = <&mcumgr_uart_sleep>;
	pinctrl-names = "default", "sleep";
	//hw-flow-control;
};

&spi1 {
	status = "disabled";
};

&i2c0 {
	status = "disabled";
};

/ {
	chosen {
		zephyr,console = &uart0;
		zephyr,shell-uart = &uart0;
		zephyr,uart-mcumgr = &uart1;
	};
};

Best

/CJ

Vidar Berg · Accepted Answer

Hello, 
 Did you apply your Devicetree overlay to the 'MCUBoot' child image? You can do this by adding the overlay to your 'child_image' with the name mcuboot.overlay (Note: perform a pristine build after adding the overlay to allow the build system to detect that it has been added). 
 Best regards, 
 Vidar

Serial Recovery never works with remapping using FT232, ncs2.4.0

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