Lecture on Building Kernel in Android using Termux

Introduction

• Discussion on building Kernel for Android using Termux.
• Prerequisite: Installation of Payrot and OS Ubuntu.
• Mention of using Kali NetHunter for those who have it installed.

Setting Up Termux

1. Open Termux: Install required tools (Payrot).
2. Download OS Ubuntu: Required for setting up the environment.
3. Alternative: Use Kali NetHunter if already installed—No need for Ubuntu.

Extracting and Setting Up Ubuntu

• Process: Extract the downloaded OS into the Termux directory.
• Note: No need for --subsystem parameter with NetHunter.
• Command: Basic commands for extraction are the same for Ubuntu and NetHunter.

Running Ubuntu

1. Navigate to the Folder: Move into the Ubuntu directory.
2. Enter Command: Execute ./start-ubuntu.sh to enter the Ubuntu OS.

Downloading Kernel Source

• Device Example: Nexus 6 is used as an example.
• Recommendation: Download zipped kernel source to save data.
• Transfer: Move the source to the OS.

Extracting Kernel Source

• Command: Use Termux to extract the kernel source.
• Note: Use termux for extraction to root directly.

Compiling Kernel

• Navigate to Source Folder: Move into the kernel source folder.
• Export and Set Up Environment:
  • Follow the instructional video or provided materials.
  • Identify the codename of the device (e.g., Nexus 6P codename: Angler).
  • Use command to set up: `export ARCH=arm64; export SUBARCH=arm64; export CROSS_COMPILE=aarch64-linux-gnu-
• Create Output Directory: mkdir -p out
• Configuration:
  • Use make angler_defconfig to configure.
  • If display issue occurs, use pinch-to-zoom on screen.
  • Follow the link provided in the tutorial for standard configurations.`

Building Kernel

• Compile Command: make -j4
• Others: Contact via Telegram or comments for support.

Conclusion

• Reminder: Processes can be lengthy depending on device specs.
• Summary: Recap important commands and steps.
• End Note: Encourage like, subscribe, and share on the platform.