(Only effective when CONFIG_BOOT_RETRY_TIME is also set)
After the countdown timed out, the board will be reset to restart
again.
+
+ CONFIG_AUTOBOOT_USE_MENUKEY
+ CONFIG_AUTOBOOT_MENUKEY
+
+ If this key is pressed to stop autoboot, then the commands in the
+ environment variable 'menucmd' will be executed before boot starts.
+ For example, 33 means "!" in ASCII, so pressing ! at boot would take
+ this action.