About this repo

This repo is based on Lineage OS 21 xiaomi sm8250 kernel source.

The main purpose of maintaining and building this kernel is to fix this battery stuck at 1% problem, and provide KernelSU integrated pre-built image(flashable anykernel3 zip). Also provides a more intuitive and easy-to-use build script and build guide that allow you to try to build by yourself.

The devices affected by the "1% battery bug" are: alioth, apollo, lmi, thyme, umi, pipa. Because they all use the PM8150, aka Qualcomm fuel gauge GEN4. For the other devices are not affected by that bug, you can use this kernel for KernelSU purpose, as a replacement of the orginal stock kernel.

How to build

1. Prepair the basic build environment.

   You have to have the basic common toolchains, such as git, make, curl, bison, flex, zip, etc, and some other packages. In Debian/Ubuntu, you can

   sudo add-apt-repository universe
   sudo apt update
   sudo apt install bc binutils-dev bison build-essential ca-certificates ccache clang cmake cpio curl file flex git libelf-dev libssl-dev lld make ninja-build python3-dev texinfo u-boot-tools xz-utils zlib1g-dev
   

   Notice: ccache is enabled in build.sh for speed up the compiling. CCACHE_DIR has been set as $HOME/.cache/ccache_mikernel in build.sh. If you don't like you can remove or modify it.

2. Download [ZYC-clang] compiler toolchain or any latest toolchain

   You have to have aarch64-linux-gnu, arm-linux-gnueabi, clang. ZYC Clang is a good prebuilt clang cross compiler toolchain. Always use latest toolchain from releases, here is an example...

   mkdir tc
   cd tc
   wget https://github.com/ZyCromerZ/Clang/releases/download/21.0.0git-20250422-release/Clang-21.0.0git-20250422.tar.gz
   tar -xvzf Clang-21.0.0git-*
   cd ..
   

3. Build

   Build Kernel:

   bash build.sh