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  1. Sorry for wasting your time, it is really that simple. Now running happily on kernel 5.4.20. Thank you for your help!
  2. Thank you for the reply. root@bananapi:/# dmesg |grep tty [ 0.000000] Kernel command line: root=UUID=2a591b9c-5c95-34af-9d1a-a591d0134ad8 rootwait rootfstype=ext4 console=tty1 console=ttyS0,115200 h1 [ 0.001175] printk: console [tty1] enabled [ 2.868060] printk: console [ttyS0] disabled [ 2.888269] 1c28000.serial: ttyS0 at MMIO 0x1c28000 (irq = 49, base_baud = 1500000) is a U6_16550A [ 2.888344] printk: console [ttyS0] enabled [ 2.911471] 1c28c00.serial: ttyS1 at MMIO 0x1c28c00 (irq = 50, base_baud = 1500000) is a U6_16550A [ 2.934678] 1c29c00.serial: ttyS2 a
  3. Hi, I'm using a cubietruck and bananapi board (both A20 devices) for a long time (They run very stable for many years). I'm using uart3 for interfacing with arduino boards using the kernel overlay. When I upgrade the kernel to a version 5+ the overlay does not work anymore and ttyS3 is not working and missing in dmesg. The behaviour is the same on both boards. Autoboot in 1 seconds, press <Space> to stop switch to partitions #0, OK mmc0 is current device Scanning mmc 0:1... Found U-Boot script /boot/boot.scr 3708 bytes read in 34 ms (106.4 KiB/s) ## Executing script