uboot进入kernel中间的延时时间可以通过BOOTDELAY这个宏来控制。修改uboot/common/Kconfig文件 config BOOTDELAY int "delay in seconds before automatically booting" default 0 depends on AUTOBOOT help Delay before automatically running bootcmd; set to 0 to autoboot with no delay, but you can stop it by key input. set to -1 to disable autoboot. set to -2 to autoboot with no delay and not check for abort