How to skip Uboot prompt

Is there any way to skip Uboot promt in openwrt image.

Which router you are talking about?

Most routers boot quite nicely to OpenWrt itself, without a need to use uboot commands in the process.

And usually an OpenWrt image has nothing to do with uboot itself, as the original uboot stays in the router always, and is not part of the OpenWrt firmware image.