About this repo

This repo (android14-lineage22-mod branch) is based on Lineage OS 22 xiaomi sm8250 kernel source.

Originally this repo (android12-stable-mod or android14-stable-mod branch) is fork from UtsavBalar1231's repo, but the android14-stable branch has freeze problem when the device sleep for a while or wake up. So now I switched to lineage22 codebase. The MIUI features code and some parts of the drivers is still copied from UtsavBalar1231's branch.

So still Thanks to @UtsavBalar1231!

(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 android14-lineage22-mod branch. It should works on both stock MIUI and third-party AOSP based Android 11-14 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
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 LZ4KD, LZ4, LZ4HC, ZSTD compression algorithms for ZRAM.

Setting Up the Environment

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 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.

Download compiler toolchain

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

The default toolchain path is $HOME/proton-clang/proton-clang-20210522/bin which is set in build.sh. If you are using another location please change TOOLCHAIN_PATH in build.sh.

mkdir proton-clang
cd proton-clang
wget https://github.com/kdrag0n/proton-clang/archive/refs/tags/20210522.zip
unzip 20210522.zip
cd ..

Build Kernel

Note

If you see errors like .relr.dyn or cannot find libc.so.6, your toolchain's ld is too old. Remove it to use the system linker, or update your toolchain.

• KSU_VERSION (Select KernelSU version):

  • ksu: Official KernelSU (v0.9.5)
  • rksu: RKSU
  • sukisu: SukiSU-Ultra
  • sukisu-kpm: SukiSU-Ultra(Enable KPM)

• SYSTEM (Target system type):

  • miui
  • aosp
  • Any other value: Build for all supported systems

To build the kernel, run:

bash build.sh TARGET_DEVICE [KSU_VERSION] [SYSTEM]