🚀 About this repo

This repo (sign branch) is based on Lineage OS 22.2 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 Ultra-Legacy (A KernelSU fork) integrated pre-built image (Flashable AnyKernel). 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. Also, as the people tested, this kernel NoKernelSU version is good for applying APatch).

The pre-built kernel image/zip is built on the sign branch. It should works on both stock MIUI and third-party AOSP based Android 11-15 ROMs. You are welcomed to give feedback (Issues/Pull Requests)!

⚙️ Note: The zip does not include the dtbo.img and it will not replace your dtbo partition. It is recommanded to keep the stock dtbo or the dtbo from your third-party rom (If the builder comfirmed it works well). Since there are some problems with the dtbo.img which built from this source, one of them is the screen will suddently goes to the highest brightness when shut try to shut off the screen in the lock screen. If you had flashed any other third-party kernels, and you got some weird problem, you should keep an eye to check your dtbo has been replaced or not.

Supported devices:

Code Name	Device Name
psyche	Xiaomi Mi 12X
thyme	Xiaomi Mi 10S
umi	Xiaomi Mi 10
munch	Poco F4 / Redmi K40S
lmi	Redmi K30 Pro
cmi	Xiaomi Mi 10 Pro
cas	Xiaomi Mi 10 Ultra
apollo	Xiaomi Mi 10T / Redmi K30S Ultra
alioth	Xiaomi Mi 11X / POCO F3 / Redmi K40
elish	Xiaomi Pad 5 Pro
enuma	Xiaomi Pad 5 Pro 5G
dagu	Xiaomi Pad 5 Pro 12.4
pipa	Xiaomi Pad 6

Other Features/Improvement of this Kernel:

1. Support USB Serial (CH340/FTDI/PL2303/OTI6858/TI/SPCP8X5/QT2/UPD78F0730/CP210X).
2. Support EROFS.
3. F2FS realtime discard enabled for better TRIM the flash.
4. Support CANBus and USB CAN adapter (Like CANable).
5. Support LZ4, LZ4HC, ZSTD compression algorithms for ZRAM.

🛠️ 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 apt install build-essential git curl wget bison flex zip bc cpio libssl-dev ccache
   

   And also, you have to have python (Only python3 is not enough). you can install the apt package python-is-python3.

   In RHEL/RPM based OS, you can

   sudo yum groupinstall 'Development Tools'
   sudo yum install wget bc openssl-devel ccache
   

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

2. Download [ReClang] compiler toolchain

   You have to have aarch64-linux-gnu, arm-linux-gnueabi, clang. ReClang is a good prebuilt clang cross compiler toolchain.

   The toolchain path is $HOME/ReClang/ReClang-Signed/bin which hasn't been set in sign.sh. Please change TOOLCHAIN_PATH in sign.sh before using it.

   mkdir ReClang
   cd ReClang
   wget https://github.com/SaleOff/ReClang/archive/refs/tags/Signed.zip
   unzip Signed.zip
   cd ..
   

3. Build

   Build without KernelSU:

   bash sign.sh TARGET_DEVICE
   

   Build with KernelSU:

   bash sign.sh TARGET_DEVICE ksu
   

   For example, build for lmi (Redmi K30 Pro/POCO F2 Pro) without KernelSU:

   bash sign.sh lmi
   

   For example, build for umi (Mi 10) with KernelSU:

   bash sign.sh umi ksu
   

   Thanks for watching.