FusinX/xiaomi-vayu — reverse-engineered prompt

I want a simple repo that contains everything needed to build and package the Xiaomi vayu device files.

It should have a clear shell build script, a device info file, an overlay folder for files that need to land on the target system, and include the device tree blob that the build uses. Make it easy for someone to clone the repo, run one command, and get the generated output or a clear error if something is missing.

Add sensible checks so the script explains required tools, paths, and what it is doing instead of failing silently. Since there is no README to copy from, keep the scope tight and add a short README with basic usage, what each file is for, and any warnings that this is device specific.

Look up current docs online if you need to.