1voud

Sorry for wasting your time, it is really that simple. Now running happily on kernel 5.4.20. Thank you for your help!

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 at MMIO 0x1c29c00 (irq = 51, base_baud = 1500000) is a U6_16550A [ 11.321905] systemd[1]: Created slice system-getty.slice. root@bananapi:/# cat /proc/device-tree/soc/serial@1c28c00/status okayroot@bananapi:/# I'm using the PG6/PG7 pins.

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 at 43100000 U-boot loaded from SD Boot script loaded from mmc 217 bytes read in 26 ms (7.8 KiB/s) 7343156 bytes read in 451 ms (15.5 MiB/s) 7744344 bytes read in 473 ms (15.6 MiB/s) Found mainline kernel configuration 42183 bytes read in 70 ms (587.9 KiB/s) 1078 bytes read in 96 ms (10.7 KiB/s) Applying kernel provided DT overlay sun7i-a20-uart3.dtbo 5845 bytes read in 82 ms (69.3 KiB/s) Applying kernel provided DT fixup script (sun7i-a20-fixup.scr) ## Executing script at 44000000 ## Loading init Ramdisk from Legacy Image at 43300000 ... Image Name: uInitrd Image Type: ARM Linux RAMDisk Image (gzip compressed) Data Size: 7343092 Bytes = 7 MiB Load Address: 00000000 Entry Point: 00000000 Verifying Checksum ... OK ## Flattened Device Tree blob at 43000000 Booting using the fdt blob at 0x43000000 Loading Ramdisk to 498ff000, end 49fffbf4 ... OK reserving fdt memory region: addr=43000000 size=70000 Loading Device Tree to 4988c000, end 498fefff ... OK Starting kernel ... root@bananapi:~# cat /proc/version Linux version 5.4.20-sunxi (root@builder) (gcc version 8.3.0 (GNU Toolchain for the A-profile Architecture 8.3-2019.03 (arm-rel-8.36))) #20.02.1 SMP Mon Feb 17 02:09:41 CET 2020 root@bananapi:~# cat /boot/armbianEnv.txt verbosity=1 logo=disabled console=both disp_mode=1920x1080p60 overlay_prefix=sun7i-a20 rootdev=UUID=2a591b9c-5c95-34af-9d1a-a591d0134ad8 rootfstype=ext4 overlays=uart3 usbstoragequirks=0x2537:0x1066:u,0x2537:0x1068:u It looks like the overlay is loaded correct. Is there anything wrong in my setup, can I try something to make it work (4.19.104-sunxi is still working fine :) Thank you!