[OpenWrt Wiki] The Boot Process
https://openwrt.org/docs/techref/process.boot09.12.2021 · reboot: Not sure, but I believe that this option tells the kernel how to perform a reboot The first program called after the kernel loads is located at the kernel options entry of the boot loader. For grub, the entry is located in the openwrt–.image.kernel.image file in the /boot/grub/menu.lst file.