I couldn't find a topic with this device, although support is announced, so I'm posting here. To moderators: please create an appropriate section. 
How to unlock UART1 and UART2 on this device?

fixed

Rockchip RK3566 has:
SDIO 3.0
10x UART, 4x SPI, 16x PWM, 6x I2C, 2x SARADC

Armbian 23.8 Bookworm for BIGTREETECH CB1 does not have any overlay USART.DTBO

I need 2 more USARTs. How can this be done?

Providing logs with 

armbianmonitor -u

 helps with troubleshooting and significantly raises chances that issue gets addressed.

legacy should have some overlays: https://github.com/bigtreetech/linux/tree/linux-6.1.y-cb1/arch/arm64/boot/dts/allwinner/overlay

"Providing logs with"

https://paste.armbian.com/oyesahujur

 

Thanks for the tip.

 

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

uart2 works, uart5 does not work.

Цитата

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)

 

Цитата

/dts-v1/;
/plugin/;

/ {
    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";
        };
    };
};