Finally, I got solve myself by not using ubuntu, but Armbian.
due to ubuntu file system seems did not expose theboot env to perform overlay

and to enable SPIDEV / I2C, need to create the respective dts file and add the overlay to the boot env.

hi all, I am trying wire up a OLED screen with spi interface but I cannot find an spidev under /dev. according to the wiki, seems I need to update the dtsi and compile the module again, when I check the source code in the download folder, I can only find the related config for r6s, any helps on upda...