2019-10-30 09:32 AM
I tried to test a UART link on the USART3 port of the STM32MP157C-DK2 board.
For that I followed the instructions of the Wiki for the modification of the Linux kernel:
But after rebooting when I do "ls -l / dev / ttySTM *" I only get the ttySTM0 (for the UART_4).
When I do "dmesg | grep ttySTM *" I get the configuration for ttySTM3 (USART_2 for Bluetooth) and ttySTM0.
After several attempts I would like to know if you would have tracks?
2019-10-30 09:39 AM
Hi @AZAMA
As a first sanity check, are you sure you are booting using your custom dtb ?
One useful trick is to set green led on in it in order to secure this. ( cf https://wiki.st.com/stm32mpu/index.php/How_to_cross-compile_with_the_Developer_Package )
Are you overriding the default dtb configuration or did you create a fourth option entry in /boot/extlinux/extlinux.conf ?
Hope it help
Olivier
2019-10-31 02:57 AM
Hi @Community member
Yes actually I did first test with the green LED which was halfway concluded.
At startup the LED turns on well but in return I lose the Ethernet connection so I do not touch it anymore.
But regarding the UART no answer.
Thanks,
Armand
2019-10-31 02:59 AM
Hi
Please have a look to following page :
https://wiki.st.com/stm32mpu/index.php/Trace_and_debug_scenario_-_UART_issue
Hope it help
Olivier