Thank you!

I tried disable RGB for sure, but UART4_M0 works and UART4_M1 does not.

UART0_M0 does not presented on wiki image that the point, only UART0_M1 is available and it works as expected.

*Latest Ubuntu image from G disk was used.

Hi!

According Wiki image UART4_M1 should exist, it can be selected by luckfox-config tool but actually does not work.
https://wiki.luckfox.com/assets/images/Luckfox-Pico-Ultra-details-inter-e55ff8f5f76d54e25629705935d42765.jpg
In dtsi provided on github, we can see why, UART4_M0 only is exist, but ...

Hi @alex9x!
I'm looking for small footprint image as well (net, serial, i2c/spi, usb).
Could you please share your final scripts ?
Thank you!

btw which startup time you was able to achieve with your minimal config ?

Solved by editing luckfox-config script

sudo nano /usr/bin/luckfox-config

multi_pins_group+=("$(echo "$pin" | sed -E 's/(UART[0-9]+_M[0-9]+)_.*$/\1/g' | sed 's/^ //')")
does not delete leading spaces and should be replaced by this one
multi_pins_group+=("$(echo "$pin" | sed -E 's/(UART[0-9 ...

Couple of finding may be it will help to understand the issue.

I can edit cfg file and then perform config reload
sudo nano /etc/luckfox.cfg
sudo luckfox-config load
It works for all UART except UART4_M1 and UART1_M1, sudo luckfox-config show does not display * sign on it.

If on/off for these ...

Hello!

I have PICO Ultra board with latest Ubuntu image flashed.
With "sudo luckfox-config" all 6 UART available ports were enabled. (UART2 - debug, all other works as expected).
After system reboot only 5 ports are visible, UART1 (/dev/ttyS1) is missing.
pico@luckfox:~$ ls /dev/ttyS*
/dev/ttyS0 ...