UART console not working on v0.4.0 (on Pi 3B)

[DieterReuter]

With the new build the output at the serial UART console shows only garbage on a Raspberry Pi 3 B.

��n�2��br��b�n�B2nn���b2LB�b��b��2B�n�rn�r�p��|�B��2����|L������L�n�B�|B2n����~nN��p��2n₞<2nn�BLn�L�n��nⲜ�`2n||L`�2L�|̎�����L2�`�2n�����bB���2�nn��n��|�br��B���`�2L�|L̎��L2�n���p~�nn��2rrN��Br2nnn�br|bp����p�rrn₞��bL����Ln�2bl�2L�|LLL����L2Ln�2�B�n�rBb`b��Lb����l�2nn�B�`~B���2�nl�2L�|L����LL2Ll2���L��B�`~�l�`�l���0�������l��~rrn�B�n��nrLN|�nn��|2���`���Ln�lb��2Ln��l�2B�����~rrn�BL�n�r2��b�Nn�`~�n�2Nn�BL�|�b�n��blrrl`2B2nn�~r2b�B2n��n̐|��~l��n�Lb�pp2rrnn���B�n��2r2L`rL�n�rrnn���B�nnn�b�n��2LL�|LL��L��2�p����L��`�nn��n��`�2��~L������~B�n��|�n�~B2�~�n�2nnl�2LL�bL��L���2�p<����L��`�nn��n��`�2��~L������~B�n�

Maybe this is related to the fact that the Pi 3 uses some different settings for the built-in Bluetooth and WiFi chip set. Will test this on a Pi 2 B and Pi 1 soon.

[DieterReuter]

This issue is only related to RPi 3, on a RPi 2 and a RPi 1 the serial UART console works as expected and even the login via UART is possible. Exactly the same behaviour on Raspbian LITE.

For now, we can note this as a RPi 3 issue only!

[DieterReuter]

Here are some more details about the UART issue on the Pi 3 RPi-Distro/repo#22.

[DieterReuter]

This issues could be fixed by including core_freq=250 in /boot/config.txt for now.