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unlock UART1 and UART2


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  • Werner changed the title to unlock UART1 and UART2

"Providing logs with"



Thanks for the tip.


I added sun50i-h616-uart2.dtbo and sun50i-h616-uart5.dtbo to the overlay. 

uart2 works, uart5 does not work.


U-Boot 2023.07-rc2-armbian (Aug 22 2023 - 14:52:37 +0000) Allwinner Technology

CPU:   Allwinner H616 (SUN50I)
Model: BigTreeTech CB1
DRAM:  1 GiB
Core:  52 devices, 18 uclasses, devicetree: separate
WDT:   Not starting watchdog@30090a0
MMC:   mmc@4020000: 0, mmc@4021000: 2, mmc@4022000: 1
Loading Environment from FAT... Unable to use mmc 1:1...
In:    serial@5000000
Out:   serial@5000000
Err:   serial@5000000
switch to partitions #0, OK
mmc1(part 0) is current device
Scanning mmc 1:1...
Found U-Boot script /boot/boot.scr
3259 bytes read in 2 ms (1.6 MiB/s)
## Executing script at 4fc00000
U-boot loaded from SD
Boot script loaded from mmc
288 bytes read in 1 ms (281.3 KiB/s)
Card did not respond to voltage select! : -110
** Bad device specification mmc 0 **
38722 bytes read in 10 ms (3.7 MiB/s)
Working FDT set to 4fa00000
808 bytes read in 3 ms (262.7 KiB/s)
Applying kernel provided DT overlay sun50i-h616-spi-spidev.dtbo
509 bytes read in 3 ms (165 KiB/s)
Applying kernel provided DT overlay sun50i-h616-uart5.dtbo
failed on fdt_overlay_apply(): FDT_ERR_NOTFOUND
Error applying DT overlays, restoring original DT
38722 bytes read in 10 ms (3.7 MiB/s)
18197188 bytes read in 3231 ms (5.4 MiB/s)




/ {
    compatible = "allwinner,sun50i-h616";

    fragment@0 {
        target-path = "/aliases";
        __overlay__ {
            serial5 = "/soc/serial@5001400";

    fragment@1 {
        target = <&uart5>;
         __overlay__ {
            pinctrl-names = "default";
            pinctrl-0 = <&uart5_ph_pins>;
            status = "okay";


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