[kagenouta]

Also worth noting that one of Google's long-term goals is to make Android bootable on mainline. They've been slowly upstreaming the patches they built into Android's base kernel, and their Treble roadmap involves further isolating the hardware drivers, to enable running a generic kernel across devices.

[zozbot234]

Yes and AIUI, libhybris is working on supporting those userspace hardware drivers on a non-AOSP install. The postmarketOS folks would rather do without using downstream code/drivers/firmware at all and keep everything upstream based, but some devices will need this and it might also be useful for quick bring up on new devices.