[OpenWrt Wiki] Init Scripts
https://openwrt.org/docs/techref/initscripts23.12.2020 · root@OpenWrt:/# /etc/init.d/example enable This will create one or more symlinks in /etc/rc.d/ which automatically execute at boot time (see Boot process )) and shutdown. This makes the application behave as a system service, by starting when the device boots and stopping at shutdown, as configured in the init.d script.
[OpenWrt Wiki] The Boot Process
https://openwrt.org/docs/techref/process.boot09.12.2021 · Detailed boot sequence boot process example for blackfin devices Boot loader After the bootloader (grub, in this example) initializes and parses any options that are presented at the boot menu, the bootloader loads the kernel. Example from the openwrt-x86-ext2-image.kernel file entry for normal boot: