Despite the lack of official support, some community-driven projects and legacy versions have targeted this SoC: Legacy Versions
If you want a step-by-step build and flash script for a specific RTL8196E model, tell me the exact device model and flash/RAM sizes.
The stock firmware uses highly customized, ancient kernels (often 2.6.x) with proprietary "blobs" for the Wi-Fi radio. Lack of Documentation:
The is a notoriously difficult System-on-a-Chip (SoC) in the world of custom router firmware. While OpenWrt is famous for breathing new life into old hardware, the RTL8196E represents one of the community's longest-running uphill battles. The Core Problem: A "Non-Standard" Architecture