amazon-austin: Init

[samueldr]

Not sure I want to merge this as-is.

I think I want to, instead, work from the kernel files from amazon.

The fork seems to have smushed together an arbitrary source tree from another MT8127 device, with the amazon drivers. The kernel looks... bad... imo.

I had to patch a lot of stuff to make dmesg not barf over all the time over. (Though some OEMs do do that too...)

At the very least, building on top of Nixpkgs 56bb1b0f7a33e5d487dc2bf2e846794f4dcb4d01 works, with the changes from #306. (With a revert in the kernel builder). Current tip of master/unstable may have issues, to be investigated later.

The flashing procedure is clunky, but when a TWRP-compatible implementation is made, it will be less so, as it will not require an additional reboot. A simple adb sideload of a flashable zip should work.

It is highly probable that on a 5th gen (amazon-ford) approximately the same implementation works. As the current kernel tree is shared between both devices, differing only by their initial defconfig. Using amazon-ford's defconfig, normalizing it, then applying the same changes may result in a usable port.

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TODO

• Use the amazon kernel dumps...

Which means, first "rehydrate" them into distinct commits on the mobile-nixos linux repo.

[samueldr]

I still have to think about whether I keep the third-party kernel attempt in the history.

But eh, it now works against the untouched vendor kernel sources!