Prevent booting from SD card

[robbo]

Would it be possible to prevent the A64-OLinuXino from being able to be booted from the SD card slot? This would essentially lock everyone out of the device unless they had a log in.

I understand that there would be risk that you could mess up your device and have no way to recover from it. That is a risk I'd be willing to take.

Really what I'm thinking is I'd like to be able to distribute these to others and be confident that no one will be able to access configuration and data on the emmc.

[LubOlimex]

No, this would require modifying the BROM (and its sub part called eGON BROM):

https://linux-sunxi.org/BROM

My advice is to unsolder the micro SD card holder. And for extra security consider encrypting the eMMC.

Consider it is often asked question for all A20 boards. There might be better suggestions online.