the menu, and an opaque pointer to data controlled by the consumer.
If you want to show a menu, instead starting the shell, define
-CONFIG_MENU_SHOW. You have to code the int menu_show(int bootdelay)
+CONFIG_AUTOBOOT_MENU_SHOW. You have to code the int menu_show(int bootdelay)
function, which handle your menu. This function returns the remaining
bootdelay.