[WIP] asus-sparrow: init

[samueldr]

Add support for the Zenwatch 2 WI501Q

This is an armv7 target.

Depends on the following PRs:

• boot/init: Make udev a dependency for the switch root target #303
• lvgui: "pan" framebuffers #305
• armv7: Misc. fixes #306

This was tested against nixpkgs@56bb1b0f7a33e5d487dc2bf2e846794f4dcb4d01, with a revert for the platform changes, since cross-compilation was still problematic on unstable at the moment I was working on this.

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Open questions

• Is it material for Mobile NixOS outright?

A "normal" Mobile NixOS system will not really work well for this target. Its storage is limited to 8GiB total, of which a chunk is reserved by system partitions.

At the same time, the design of wear OS based devices is basically a de-glorified cellphone CPU. Which means there is a lot of value in the Mobile NixOS tooling.

Maybe we want to also cater to watches in this repository. Maybe we would prefer making it an off-shoot project which specializes in watch things.

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Video / pictures

https://www.youtube.com/watch?v=qdmn-jIaIa8

[samueldr]

Rebased on top of master, with required changes.

It seems all asus devices come from a similar Lineage of kernel sources with the same kind of issues! Peculiar!

[samueldr]

Rebased again. No changes required.

Though something makes it take about 2 minutes to boot now. I don't recall it taking so long beforehand.

[samueldr]

Hi! 👋

I have taken the (not so hard) decision to drop support for vendor-based devices.

I'm closing this PR since it only targets working with vendor-based devices. It is not a judgement of the quality of the changes, but really that I don't think it's healthy to keep hoping they may end-up working fine in that state.

Though, it doesn't mean there's no hope to ever see these devices end-up useful. Far from it. But to see them being useful, work on mainline Linux and other projects will need to happen.

Thank you for your understanding,

(See also: #643)