nixpwned

In a major feat of nominative determinism, we got NixOS to run on the nixplay.

Status: We have Linux 6.12 booting!

• Serial works!
• Display kind of works with the old device tree (but graphics are corrupt)
• Device tree needs forward porting
• CPU dies if we use more than one core

Hardware

Tested against the Nixplay W10K or Apolosign frames.

Note that the Apolosign has better hardware, including a newer PCB and better flash chip. They're all RK3126C based, though.

Nixplay W10K

Apolosign 10.1 inch ("powered by Nixplay")

Existing software

These run Android 5 (!!!) which is truly ancient.

Development

Run nix develop.

• Reset into MaskROM mode. On some Nixplay devices this is, bogglingly, holding the externally facing reset button (which isn't a factory reset, it lets you go into MaskROM mode without opening the case) and plugging USB in.
• Run lsusb and you should see the Rockchip MaskROM device.

Serial

One of these works great for finding the pins (thanks @MatthewCroughan for the suggestion)

Use 3.3v logic levels, here's an adapter

Building

nix build .#nixosConfigurations.nixplay.config.system.build.nixplay.all -L

Many things will be broken. This is released mostly as-is.

Flashing

• BACK UP YOUR PARAMS AND PARTITIONS FIRST!
• rkflashtool P < result/params
• rkflashtool w boot < result/boot.img
• rkflashtool w userdata < <(zstdcat result/userdata.img.zst)