Huawei has released Android Pie kernel sources for its devices running on the Kirin 970 and Kirin 980 SoCs. This will enable community developers to work on the devices more effectively, although the lack of official bootloader support makes the whole thing almost pointless.
https://www.notebookcheck.net/Huawei-releases-Android-Pie-kernel-sources-for-its-flagship-phones.392121.0.html