This Android Board Support Package (BSP) provides the necessary software components to support Android OS on the target hardware platform. It includes kernel modifications, device drivers, hardware abstraction layers (HAL), and platform-specific configurations.

bsp/ ├── kernel/ # Modified Linux kernel source ├── device/ # Device-specific configurations ├── vendor/ # Vendor-specific implementations ├── hardware/ # Hardware abstraction layers ├── bootloader/ # Bootloader sources ├── tools/ # Build and flash utilities └── docs/ # Documentation 

• Ubuntu 20.04 LTS or later (recommended)
• 16GB RAM minimum (32GB recommended)
• 200GB free disk space
• Java Development Kit (JDK) 8 or 11

sudo apt-get update sudo apt-get install -y git-core gnupg flex bison build-essential \ zip curl zlib1g-dev gcc-multilib g++-multilib libc6-dev-i386 \ lib32ncurses5-dev x11proto-core-dev libx11-dev lib32z1-dev \ libgl1-mesa-dev libxml2-utils xsltproc unzip fontconfig

source build/envsetup.sh lunch [target_product]-[build_variant] # Example: lunch mydevice-userdebug

# Build the kernel cd kernel make ARCH=arm64 [defconfig_name] make -j$(nproc) # Build the full Android image cd [android_root] make -j$(nproc)

After successful build, images will be available in:

out/target/product/[device_name]/ ├── boot.img ├── system.img ├── vendor.img ├── dtbo.img └── recovery.img 

1. Power off the device
2. Boot into bootloader mode:
   • Hardware method: [Specific button combination]
   • ADB method: adb reboot bootloader

fastboot flash boot boot.img fastboot flash system system.img fastboot flash vendor vendor.img fastboot flash dtbo dtbo.img fastboot reboot

Location: kernel/arch/arm64/boot/dts/vendor/

Key files:

• [soc].dtsi - SoC common definitions
• [board].dts - Board-specific configuration
• [board]-[variant].dts - Device variant configurations

# Compile DTS to DTB dtc -O dtb -o output.dtb input.dts # Decompile DTB to DTS dtc -I dtb -O dts -o output.dts input.dtb

• android.hardware.graphics.composer@2.4 - Display HAL
• android.hardware.audio@7.0 - Audio HAL
• android.hardware.camera.provider@2.4 - Camera HAL
• android.hardware.sensors@2.0 - Sensors HAL
• android.hardware.bluetooth@1.0 - Bluetooth HAL

1. Create HAL service in hardware/interfaces/
2. Implement the HIDL/AIDL interface
3. Update device makefile to include the module

Location: kernel/drivers/misc/[vendor]/

To add a new driver:

1. Create driver source in appropriate subsystem
2. Update Kconfig and Makefile
3. Add device tree bindings
4. Register driver in platform initialization

# Configure kernel make menuconfig # Save configuration cp .config arch/arm64/configs/[defconfig_name]

adb shell dmesg cat /proc/kmsg

adb logcat adb logcat -b all

• UART Port: [UART configuration]
• Baud Rate: 115200
• Pinout: [TX/RX/GND pins]

# Run VTS (Vendor Test Suite) vts-tradefed run commandAndExit vts # Run CTS (Compatibility Test Suite) cts-tradefed run commandAndExit cts

# Test specific components adb shell am instrument -w [test_package]

• Suspend-to-RAM: Supported
• Suspend-to-IDLE: Supported
• Runtime PM: Enabled for peripherals

Edit: device/[vendor]/[device]/power/

• Thermal zones defined in device tree
• Cooling devices: [List cooling mechanisms]
• Trip points configured for CPU/GPU

Default governor: schedutil

• GPU frequency scaling enabled
• Default frequency: [Frequency in MHz]

• ION heap sizes configured in device tree
• CMA pool size: [Size] MB

• AVB 2.0 enabled
• Rollback protection implemented
• Chain of trust from bootloader to system

Location: device/[vendor]/[device]/sepolicy/

• VDD_CPU: [Measurement point]
• VDD_GPU: [Measurement point]
• VDD_MEM: [Measurement point]

# Enter factory mode adb shell am start com.android.factory/.FactoryActivity

Location: vendor/[vendor]/factory/

1. [Issue description and workaround]
2. [Issue description and workaround]

• Hardware Reference Manual: [Link/Reference]
• Schematics: [Location/Restrictions]
• Datasheets: [Location/Restrictions]

• BSP Support: [Email/Contact]
• Hardware Support: [Email/Contact]
• Bug Reports: [Issue Tracker Link]

[License Information, e.g., GPL v2 for kernel, Apache 2.0 for Android modifications]

See CHANGELOG.md for version history and changes.

Note: This BSP is specific to the hardware platform mentioned above. Porting to other hardware requires significant modifications.