U-Boot Command Reference for Embedded Linux Flashing and Boot Configuration
Entering the U-Boot prompt
When the board powers on, U-Boot waits for a short time for default boot sequence. The exact key sequence depends on the vendor:
Press Enter on some boards.
Type tpl on others.
Any key may also work.
A typical countdown message appears:
Enter magic string to stop autoboot in 1 seconds
Successful entry drops you int ...
Posted on Sat, 23 May 2026 20:48:00 +0000 by zoreli