How to cancel u-boot auto boot?

#1

u-boot print “press ctrl+c to cancel auto boot”
but my usb keyboard has not been powerup yet.

#2

I havent tried with a USB keyboard but you can do it from serial if you have a usb to ttl cable
https://wiki.radxa.com/Rockpi4/dev/serial-console

#3

ok, send ^C by serial, thanks

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