[Xiaomi Redmi Note 4 Questions & Answers] nischait:
Follow ground zero development thread and also link here so others can see and test their work. Without proper information don't post your questions in any other thread. Make a specific thread for same.

Ground zero in news in last week. And you know Xiaomi yet not released kernel source so they can't work on Xiaomi without any kernel.

You can see their work after kernel source availablity

The Ground Zero Open Source Project (GZOSP): an Android Oreo Base for Custom ROM Development

Don't Call Me Validus

Ground Zero ROMs, the ROM development team that brought us the popular custom ROMs Tesla, Tipsy, and Validus, has provided a central Android Oreo repository from which custom ROMs can be built without having to start from scratch (meaning straight from AOSP). The idea of the Ground Zero Open Source Project (GZOSP) is to give custom ROM builders a better starting point with both the necessary AOSP code and the CAF (Code Aurora Forum, Qualcomm’s own repository which is useful for non-Nexus devices with Snapdragon SoCs) code to build for a wide variety of devices.

It should not be confused with the popular ROMs Tesla, Tipsy, and Validus because it contains none of the features that make those ROMs unique. Accordingly, when you build from this repository, the team requests that you do not brand your ROM as an unofficial Tesla, Tipsy, or Validus build until they’ve released the first official version for public consumption.

This repository includes the following:

Basic features expected of all custom ROMs (such as advanced reboot menu, night mode, and Quick Settings brightness slider control)

Bug fixes that Google won’t be pushing out until the next monthly security patch or even the next Android maintenance update

AOSP features that Google deactivates by default such as System UI Tuner

Other Android Oreo-specific additions listed here or on the repository’s home page here

As mentioned previously, GZOSP does not include the set of custom features we’ve come to expect from the popular Ground Zero ROMs Tesla, Tipsy, and Validus. For example, you won’t see any built-in dark system themes, the Wolves Den custom settings section, or Validus wallpapers. The reason for this is simple: the team’s goal is to provide a base for any and all developers to build their own custom ROMs without being limited to the three Ground Zero ROM brands that the project is best known for.

If you build straight from the GZOSP repository, you’ll get a stock Android 8.0 Oreo build with the additions listed previously, but with none of the features specific to existing custom ROMs. It’s an alternative to building from LineageOS 15.0 as a base or from Slim or Paranoid Android in which you have all of their custom features included by default. Meanwhile, you have any CAF code you need available to run the non-Nexus devices listed here (more will be added in time) and you’re not being limited to what Google has merged in AOSP.

There have, of course, been other attempts to build a central repository designed for custom ROM development, but in the case of GZOSP, the team has assured us that they will keep it updated because it’s the starting point from which they will create their Validus repository (until further notice, Validus will be the only Ground Zero ROM being developed for Android Oreo). If you have any further questions about GZOSP, you can post them in the team’s Google+ community or in the XDA forums.