NRF9160KD UART configuration

Question

hello all, 
 nRF Connect SDK: 1.5.0 
 nRF Connect Toolchain: 1.5.0 
 Desktop OS: Windows 10 
 I'm currently using nrf9160dk to explore the GNSS features. I take a look at the sample example of gps and was able to read NMEA protocols out of the VCOM via micro USB port. The next step I want to do is to route the output of NMEA code to the external UART pins which are P0.28, P0.29 for TX/RX. 
 
 I also read the thread, 
 https://devzone.nordicsemi.com/f/nordic-q-a/45476/connecting-uart1-to-a-periph-on-nrf9160-dk?ReplySortBy=CreatedDate&ReplySortOrder=Ascending 
 So I try to configure the 
 CONFIG_BOARD_PCA10090_UART0_ARDUINO=y 
 But I checked the dependency file in zephyr_config.c, it seems there is not such parameter anymore. I guess the name has been changed since the thread is 2-yr old. So what's the current parameter I should change? 
 in config.c file the params related to UART are 
 GEN_ABSOLUTE_SYM(CONFIG_UART_INTERRUPT_DRIVEN, 1);
GEN_ABSOLUTE_SYM(CONFIG_HAS_HW_NRF_UARTE0, 1);
GEN_ABSOLUTE_SYM(CONFIG_HAS_HW_NRF_UARTE1, 1);
GEN_ABSOLUTE_SYM(CONFIG_HAS_HW_NRF_UARTE2, 1);
GEN_ABSOLUTE_SYM(CONFIG_HAS_HW_NRF_UARTE3, 1);
GEN_ABSOLUTE_SYM(CONFIG_UART_CONSOLE_ON_DEV_NAME, 1);
GEN_ABSOLUTE_SYM(CONFIG_UART_CONSOLE, 1);
GEN_ABSOLUTE_SYM(CONFIG_UART_CONSOLE_INIT_PRIORITY, 60);
GEN_ABSOLUTE_SYM(CONFIG_UART_NRFX, 1);
GEN_ABSOLUTE_SYM(CONFIG_UART_0_NRF_UARTE, 1);
GEN_ABSOLUTE_SYM(CONFIG_UART_0_ENHANCED_POLL_OUT, 1);
GEN_ABSOLUTE_SYM(CONFIG_UART_0_INTERRUPT_DRIVEN, 1);
GEN_ABSOLUTE_SYM(CONFIG_UART_0_NRF_TX_BUFFER_SIZE, 32);
GEN_ABSOLUTE_SYM(CONFIG_UART_1_NRF_UARTE, 1);
GEN_ABSOLUTE_SYM(CONFIG_UART_1_INTERRUPT_DRIVEN, 1);
GEN_ABSOLUTE_SYM(CONFIG_UART_1_ENHANCED_POLL_OUT, 1);
GEN_ABSOLUTE_SYM(CONFIG_UART_1_NRF_TX_BUFFER_SIZE, 32);
GEN_ABSOLUTE_SYM(CONFIG_NRF_UARTE_PERIPHERAL, 1);
 
 Another question I have is, to change the serial comm baudrate, what's the proper method to do that? 
 
 UPDATE on 2021/04/14: 
 It works for me now. After working with Matt (our local FAE), we found there is no such option to add following code to prj.conf file. 
 CONFIG_BOARD_PCA10090_UART0_ARDUINO=y

or

CONFIG_BOARD_NRF9160DK_UART0_ARDUINO=y which is mentioned in this thread (2 years ago): 
 https://devzone.nordicsemi.com/f/nordic-q-a/45476/connecting-uart1-to-a-periph-on-nrf9160-dk?ReplySortBy=CreatedDate&ReplySortOrder=Ascending 
 The current option has been moved to device tree, so I added an overlay file to the zephyr sample project: hello_world and build it for nrf9160dk_nrf52840 board. It's a separate project for the nrf52840 chip on the nrf9160dk. here is a diagram from hardware user guide, 
 
 U7 is controlled by nRF52 chip and we only need the hardware setting from hello_world project. More specifically, from the hardware user manual, 
 
 we need to flip the 'nRF91_UART1_CTRL' pin which is controlled by nRF52 chip. 
 After figure that out, all you need is an overlay file in the hello_world project folder, name it 'nrf9160dk_nrf52840.overlay' and put the following code into it, 
 &vcom0_pins_routing {
 compatible = "nordic,nrf9160dk-optional-routing";
 control-gpios = <&gpio1 14 GPIO_ACTIVE_HIGH>;
 status = "okay";
};
 
 I struggled with the syntax error at the beginning, I found the guideline is helpful, 
 http://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/zephyr/guides/dts/howtos.html#set-devicetree-overlays

NRF9160KD UART configuration

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