Thanks. I have tried and compiled image, but when I boot with SD card nothing appears, and Serial interface seems that disconnects. I have tried both with "uboot" button pressed and not. These are, I think, the gpio you asked gpio_encrypt { compatible = "allwinner,gpio_encrypt"; gpio_number_sun = <0x05>; gpio1_value = <0x00>; gpio2_value = <0x01>; gpio3_value = <0x01>; gpio4_value = <0x01>; gpio5_value = <0x01>; gpio1_pin = <0x53 0x08 0x0d 0x01 0xffffffff 0xffffffff 0x00>; gpio2_pin = <0x53 0x08 0x09 0x01 0xffffffff 0xffffffff 0x00>; gpio3_pin = <0x53 0x08 0x01 0x01 0xffffffff 0xffffffff 0x00>; gpio4_pin = <0x53 0x07 0x06 0x01 0xffffffff 0xffffffff 0x00>; gpio5_pin = <0x53 0x07 0x07 0x01 0xffffffff 0xffffffff 0x00>; status = "okay"; linux,phandle = <0x17d>; phandle = <0x17d>; }; or these ones? boot_init_gpio { device_type = "boot_init_gpio"; status = "okay"; gpio0 = <0x53 0x08 0x0b 0x01 0xffffffff 0xffffffff 0x00>; gpio1 = <0x53 0x08 0x0c 0x01 0xffffffff 0xffffffff 0x01>; gpio2 = <0x53 0x08 0x0e 0x01 0xffffffff 0xffffffff 0x00>; };

So maybe it would be enough if the community version of U-Boot were updated to version v2025.07 and it would solve the reboot problem for this SBC, just like it happened for the Orange Pi Zero 3 where updating U-Boot to v2025.04 solved the problem of decoding RAM size on the SBC

Today it is EDGE v6.15 no v6.16.

Recommended to upgrade U-Boot to version v2025.07 This version has big changes for allwinner (sunxi) chips. This concerns the initialization of a non-standard size of RAM (1.5; 2.5 GB), downloads from eMMC.....

Yes, that's right. This is relevant to the issue under discussion.