I'm new to embedded linux. I read tutorial compile U-boot with Udoo neo board, https://www.udoo.org/docs-neo/Advanced_Topics/Compile_U-Boot_Bootloader.html. I have some questions:
/media/$USER/boot
/media/$USER/udoobuntu
sudo dd if=SPL of=/dev/*** bs=1K seek=1
sudo dd if=u-boot.img of=/dev/*** bs=1K seek=69
When I ran follow these commands with path /dev/mmcblk0 and insert SD to my Udoo-neo for booting. It showed 3 seconds and press any keys for exit auto reboot. But I don't know what button I need to press?
It's the good old "any key", into the serial console you're using the device on.