This section will guide you through build and deployment process of the MPTCP kernel.

Start with cloning the Linux kernel and ARM cross compilation toolchain from Github:

git clone
git clone

Now you are ready to build the kernel. First, set some environment variables and make the default config. Then you are ready to go:

cd mptcp_nexus5
export ARCH=arm SUBARCH=arm CROSS_COMPILE=../platform-prebuilts-gcc-linux-x86-arm-arm-eabi-4.7/bin/arm-eabi-
make hammerhead_defconfig
make -j8

Note: If you are using are more recent version of perl, you may encounter the following error:

Can't use 'defined(@array)' (Maybe you should just omit the defined()?) at kernel/ line 373.

If this happens, you have remove the if-statement in line 373 in the file kernel/

This will take a while, just be patient.

After the compilation is done, you have to make a bootable image:

abootimg -x <PATH_TO_ANDROID_FACTORY_IMG>/boot.img
sed -i 1d bootimg.cfg
abootimg --create mptcp_boot.img -f bootimg.cfg -k arch/arm/boot/zImage-dtb -r initrd.img

The final step, boot the created image:

adb reboot bootloader
sudo fastboot boot -c "console=ttyHSL0,115200,n8 androidboot.hardware=hammerhead user_debug=31 maxcpus=2 msm_watchdog_v2.enable=1" mptcp_boot.img

That’s it. You have build and deployed a MPTCP kernel for Android. Please note, that the change is only in-memory. After rebooting, the stock kernel will be used again and you have to reboot the MPTCP kernel. If you want to flash the kernel permanently, use the follwing command: fastboot flash boot mptcp_boot.img.

Proceed with the next step of the instructions.