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I'm using Yocto-dunfell for getting custom my Raspberrypi3 image. Here I want to enable serial-console via uart1. for that I have given change in my files-

local.conf:

ENABLE_UART = "1"   
ENABLE_KGBD = "1"

and changes in my config.txt file:

dtoverlay=pi3-disable-wifi"
dtoverlay=pi3-disable-bt"               
dtoverlay=uart1,txd1_pin=32,rxd1_pin=33"                               
enable_uart=1                
core_freq=250                
force_turbo=1

and cmdline.txt:

dwc_otg.lpm_enable=0 console=serial1,115200 console=tty1 root=/dev/mmcblk0p2 rootfstype=ext4 elevator=deadline rootwait kgdboc=serial0,115200

After these changes also I'm not getting serial data in my minicom. Please assist me if any further changes are required.

Thanks & Regards.

Prashant
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2 Answers2

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To use the default serial console available on pin 8 and 10 (GPIO 14 and 15) you have to use a USB to TTL serial adapter. How to connect it and how do configure the RasPi to get the serial console working you can look at What is the correct way to connect serial console on RPi4 Model B?.

Ingo
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Issue resolved, this issue was persisting because uart1.dtbo was not getting added in /boot/overlays/ path by default, so for making this to happen just added KERNEL_DEVICETREE_append = "overlays/uart1.dtbo" to my local.conf file. Before building it, changed uart1 pin from 14 15 to 32 33 in build/tmp/work-shared/raspberrypi3/kernel-source/arch/arm/boot/dts/overlays/uart1-overlay.dts
after this compiled the raspberrypi kernel by bitbake linux-raspberrypi -c compile -f;bitbake linux-raspberrypi
done after this compiled the whole source code by bitabke my-image, now flashed .sdimg image using dd command and now console via uart1 on pin 32 and 33 is working fine.

Prashant
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