I want to convert my Raspberry Pi 4 (running Ubuntu) to a WiFi AP using OpenWRT. Is there a way to take specific modules (to build a WiFi AP) from OpenWRT (apt/make install) without doing a complete firmware flash?
@RedfordD, welcome to the community!
No. It's the same as installing a new distro onto your device.
Particularly, the drivers for the wifi chips and other network components require the running kernel to exactly match. So OpenWrt is installed as a complete OS.
You cannot install Openwrt packages on a non-Openwrt OS
the kernel is simply not built the same
However the Raspbian repository has their own build of many routing packages like:
and some of them are the same software that openwrt uses, but specifically compiled to work on the Pi
Here is their official guide to make the Pi into an access point as an example: