Android TI Guide
This page is using the default release am62-android-13_09.00.00-v1.0.
To view this page for a specific Variscite SoM and software release, please follow these steps:
- Visit variwiki.com
- Select your SoM
- Select the software release
Introduction
This page describes how to build and deploy Android 13 on the VAR-SOM-AM62. It is based on TI's Android 13-09.00.00 release.
Overview
The objective of this document is to guide VAR-SOM-AM62 Android developers to obtain Android 13 sources, setting up host environment, compilation, and deployment.
This document contains instructions for:
- Hardware and software requirements.
- Setup the hardware.
- Setup the toolchain.
- Download & build the sources.
- Install the binaries on the VAR-SOM-AM62 SOM and variants.
- Making Changes to kernel/configuration and update VAR-SOM-AM62 SOM and variants.
Supported Hardware and Features
Hardware Requirements
You will need the Variscite VAR-SOM-AM62 based evaluation kit.
Host (PC) Setup Requirements
The host development environment for Android is based on Ubuntu, please install one of the following Ubuntu versions:
- Ubuntu 20.04/22.04 64bit LTS http://www.ubuntu.com/download/desktop
If you are running Linux in a virtual machine you need at least 16GB of RAM and 32 GB of swap.
The build process requires ~250GB of free storage space of SSD.
Before starting a build, make sure you have adequate free space available.
Variscite offers Docker containers as an alternative for a development environment, which can be used instead of a virtual machine or a dedicated computer.
To learn more, please see Variscite's Docker Build Environment guide.
Windows with WSL/WSL2 is not supported for Android BSP.
Install required packages on host PC
$ sudo apt -y install gnupg flex bison gperf build-essential gcc-multilib g++-multilib $ sudo apt -y install python3-pyelftools python3-dev python3.6 python2 python-is-python3 $ sudo apt -y install libc6-dev-i386 libncurses5 libncurses5-dev lib32z-dev libz-dev liblz-dev liblzo2-2 liblzo2-dev lzop lz4 cpio $ sudo apt -y install libgl1-mesa-dev libxml2-utils xsltproc unzip bc libssl-dev ccache curl $ sudo apt -y install git zip swig mtools uuid uuid-dev zlib1g-dev u-boot-tools lib32z1-dev fontconfig $ sudo apt -y install mtd-utils device-tree-compiler gdisk m4 dwarves libgnutls28-dev libelf-dev x11proto-core-dev libx11-dev
For Ubuntu 20.04 and above:
The package android-tools-fsutils is obsolete and has been replaced by android-sdk-libsparse-utils.
$ sudo apt -y install android-sdk-libsparse-utils
Configure Git
$ git config --global user.name "Your Name" $ git config --global user.email "Your Email"
Install the OpenJDK
To install it:
$ sudo apt update $ sudo apt install openjdk-8-jdk
If your Ubuntu version is missing the package (which shouldn't happen), add the PPA repository and run the previous commands again:
$ sudo add-apt-repository ppa:openjdk-r/ppa
Update the default Java version by running:
$ sudo update-alternatives --config java $ sudo update-alternatives --config javac
Note: The build process requires about 500GB of free space.
Check Python Version
In the next steps, we will download (from Google repositories) the command repo, used to download all the Android source repositories.
Certain tools like bpttools requires python2 which is not available default on Ubuntu 20.04 or 22.04 LTS.
Ubuntu 20.04/22.04 LTS users can install it running
$ sudo apt install software-properties-common $ sudo add-apt-repository ppa:deadsnakes/ppa $ sudo apt update $ sudo apt install python3.6 python2
Make sure you use latest repo tool for all bug fixes
Obtain Source Code
Variscite's Linux kernel and U-Boot are available through Github. Required patches for the Android file system are pre-installed
Download Google Repo Tool
$ mkdir -p ~/bin $ curl -o ~/bin/repo https://commondatastorage.googleapis.com/git-repo-downloads/repo $ chmod a+x ~/bin/repo $ export PATH=~/bin:$PATH
Clone Variscite's U-Boot and Linux kernel Sources
$ mkdir ~/var_aosp_ti-13_09_00_00 && cd $_ $ export YOUR_PATH=$PWD
$ mkdir -p ${YOUR_PATH}/ti-bootloader-aosp/ && cd $_
$ repo init -u https://github.com/varigit/variscite-bsp-platform.git -b ti-android-13.0.0_r62-var01 -m RLS_09_00_Bootloader.xml
$ repo sync -j$(nproc)
$ mkdir -p ${YOUR_PATH}/ti-kernel-aosp/ && cd $_
$ repo init -u https://github.com/varigit/variscite-bsp-platform.git -b ti-android-13.0.0_r62-var01 -m RLS_09_00_Kernel.xml
$ repo sync -j$(nproc)
Clone Variscite's AOSP Sources
$ mkdir -p ${YOUR_PATH}/ti-aosp-13 && cd $_
$ repo init -u https://github.com/varigit/variscite-bsp-platform.git -b ti-android-13.0.0_r62-var01 -m RLS_09_00.xml
$ repo sync -j$(nproc)
Apply Variscite's platforms patches and install toolchains
$ cd ${YOUR_PATH}/ti-aosp-13/device
$ variscite/scripts/install.sh
Build Bootloader Components
Export Toolchains and setup paths
$ export PATH=$PATH:${YOUR_PATH}/ti-bootloader-aosp/toolchain//bin:${YOUR_PATH}/ti-bootloader-aosp/toolchain//bin
$ export G_ATF_SRC_DIR="${YOUR_PATH}/ti-bootloader-aosp/arm-trusted-firmware"
$ export G_OPTEE_SRC_DIR="${YOUR_PATH}/ti-bootloader-aosp/optee_os"
$ export G_CORE_LINUX_FIRMWARE_SRC_DIR="${YOUR_PATH}/ti-bootloader-aosp/ti-linux-firmware"
$ export G_UBOOT_SRC_DIR="${YOUR_PATH}/ti-bootloader-aosp/ti-u-boot"
$ export G_UBOOT_DEF_CONFIG_R="am62x_var_som_r5_defconfig" $ export G_UBOOT_DEF_CONFIG_A="am62x_var_som_a53_defconfig"
Building ARM Trusted Firmware (ATF)
$ cd ${G_ATF_SRC_DIR}
$ make distclean
$ make -j$(nproc) E=0 CROSS_COMPILE=aarch64-none-linux-gnu- ARCH=aarch64 PLAT=k3 TARGET_BOARD=lite SPD=opteed CFLAGS+="-DK3_PM_SYSTEM_SUSPEND=1"
Building OP-TEE OS
$ cd ${G_OPTEE_SRC_DIR}
$ make clean && rm -rf out
$ make -j$(nproc) PLATFORM=k3 CFG_ARM64_core=y CROSS_COMPILE=arm-none-linux-gnueabihf- CROSS_COMPILE64=aarch64-none-linux-gnu-
Building U-Boot for R5 Core
$ cd ${G_UBOOT_SRC_DIR}
$ make mrproper
$ make -C ${G_UBOOT_SRC_DIR} mrproper
$ make ARCH=arm CROSS_COMPILE=arm-none-linux-gnueabihf- ${G_UBOOT_DEF_CONFIG_R} O=${G_UBOOT_SRC_DIR}/out/r5
$ make -j$(nproc) ARCH=arm CROSS_COMPILE=arm-none-linux-gnueabihf- BINMAN_INDIRS=${G_CORE_LINUX_FIRMWARE_SRC_DIR} O=${G_UBOOT_SRC_DIR}/out/r5
Building U-Boot for A53 Core with Android
$ cd ${G_UBOOT_SRC_DIR}
$ make mrproper
$ make ARCH=arm CROSS_COMPILE=aarch64-none-linux-gnu- ${G_UBOOT_DEF_CONFIG_A} O=${G_UBOOT_SRC_DIR}/out/a53
$ make ARCH=arm CROSS_COMPILE=aarch64-none-linux-gnu- am62x_android_a53.config O=${G_UBOOT_SRC_DIR}/out/a53
$ make -j$(nproc) ARCH=arm CROSS_COMPILE=aarch64-none-linux-gnu- \
BL31=${G_ATF_SRC_DIR}/build/k3/lite/release/bl31.bin \
TEE=${G_OPTEE_SRC_DIR}/out/arm-plat-k3/core/tee-pager_v2.bin \
BINMAN_INDIRS=${G_CORE_LINUX_FIRMWARE_SRC_DIR} O=${G_UBOOT_SRC_DIR}/out/a53
Copying Bootloader Images to AOSP Build
$ cp ${G_UBOOT_SRC_DIR}/out/r5/tiboot3-am62x-hs-fs-am62x-var-som.bin ${YOUR_PATH}/ti-aosp-13/vendor/ti/am62x/bootloader/am62x-sk/tiboot3-hsfs.bin
$ cp ${G_UBOOT_SRC_DIR}/out/r5/tiboot3-am62x-gp-am62x-var-som.bin ${YOUR_PATH}/ti-aosp-13/vendor/ti/am62x/bootloader/am62x-sk/tiboot3.bin
$ cp ${G_UBOOT_SRC_DIR}/out/a53/tispl.bin ${G_UBOOT_SRC_DIR}/out/a53/u-boot.img ${YOUR_PATH}/ti-aosp-13/vendor/ti/am62x/bootloader/am62x-sk/
Building the Kernel Image
$ cd ${YOUR_PATH}/ti-kernel-aosp/
$ export DIST_DIR=${YOUR_PATH}/ti-aosp-13/device/ti/am62x-kernel/kernel/6.1
$ tools/bazel run //common:ti_dist -- --dist_dir=$DIST_DIR
Note: The building process using the bazel tool is not a standard kernel build process, unlike make/soong. Google has published the guideline and package GKI bazel build, refer to https://source.android.com/docs/core/architecture/kernel/generic-kernel-image for more details.
To re-build Kernel fast for changes from the previous full build
$ tools/bazel run --config=fast //common:ti_dist -- --dist_dir=$DIST_DIR
Build Android Images
Change to Android top level directory.
$ cd ${YOUR_PATH}/ti-aosp-13
$ source build/envsetup.sh
$ lunch am62x_var_som-userdebug
or
$ lunch am62x_var_som-user
Note: userdebug build creates a debuggable version of Android.
user build creates a production version of Android.
Build Android File System
Switching from eMMC build to SD card build and vice versa
- For eMMC boot
$ m TARGET_AVB_ENABLE=true -j$(nproc) 2>&1 | tee build-emmc.log
- For SD boot
$ m TARGET_AVB_ENABLE=true TARGET_SDCARD_BOOT=true -j$(nproc) 2>&1 | tee build-sd.log
Images created by the Android build
The resulted images are located in out/target/product/am62x_var_som.
Boot options
Boot options of the Android:
1. U-Boot boots from on-SOM eMMC
2. Directly from SD card (Requires separate build for AOSP images.)
Flash and boot Android from SD card
Create a bootable SD card
$ cd out/target/product/am62x_var_som
$ simg2img super.img super_raw.img
$ gzip super_raw.img
$ cd ${YOUR_PATH}/ti-aosp-13
$ sudo ./device/variscite/scripts/sh/var-mksdcard.sh /dev/sdX; sync
- Replace /dev/sdX with your true device, You can identify it with dmesg.
Boot From SD card
Make sure the BOOT SELECT DIP switch on the carrier board is set correctly before you power on the board.
$ SW3 $ 0 : Boot from SD card $ 1 : Boot from eMMC
Flash and boot Android from eMMC
Flashing Android from Linux shell (when the primary installation android)
An example of flashing eMMC, can be found here.
Follow the following steps instructions above:
1. Preparing a rescue SD card;
2. Flash from command line (use the install_android.sh script)
Flashing Android with USB Fastboot
Install tools on host
$ sudo apt-get install android-tools-adb android-tools-fastboot
Note: Make sure you built Android for eMMC
Connect the target with host PC at fastboot mode:
- Connect a USB OTG cable from the target board OTG port to a your host machine USB HOST port.
- Power up the board and hit return/space to stop the boot at U-Boot.
- type fastboot 0 in the U-Boot command line.
On the Host PC:
Update Android firmware
Generate OTA packages
For generating "OTA" packages, use the following commands:
$ cd ${YOUR_PATH}/ti-aosp-13
$ source build/envsetup.sh
$ lunch PRODUCT=am62x_var_som-userdebug
$ m TARGET_AVB_ENABLE=true -j$(nproc) otapackage
Install OTA package to device:
- Extract payload.bin and payload_properties.txt from OTA zip file
- Push payload.bin to board's /data/ota_package dir: adb push payload.bin /data/ota_package/ .
- Open payload_properties.txt on an editor to copy its content, lets suppose it's like in the TI manual:
FILE_HASH=wuBhu49k3pCmQmMl8S/n2NRm1he3A+IHshcQiOfCKc4= FILE_SIZE=501067958 METADATA_HASH=qPWe72T37KgJtyJhuKSlNkFm1NflKFnLy+An4GnoXyA= METADATA_SIZE=31967
- Input the following command on the board's console to update:
su setenforce 0 update_engine_client --payload=file:///data/ota_package/payload.bin --update --headers="FILE_HASH=wuBhu49k3pCmQmMl8S/n2NRm1he3A+IHshcQiOfCKc4= FILE_SIZE=501067958 METADATA_HASH=qPWe72T37KgJtyJhuKSlNkFm1NflKFnLy+An4GnoXyA= METADATA_SIZE=31967"
Make sure that the -- header equals to the exact content of payload_properties.txt without "space" or "return" character.
After issuing the command, nothing seems to happen on the device, but you can monitor logcat for operation progress.
logcat | grep update_engine
After a successful update, you can reboot into the updated version (_b/_a) slot.
Manual operations
Build boot.img
When you perform changes to the kernel, you may build boot.img solely instead of building the whole Android.
$ cd ${YOUR_PATH}/ti-kernel-aosp/
$ export DIST_DIR=${YOUR_PATH}/ti-aosp-13/device/ti/am62x-kernel/kernel/6.1
$ tools/bazel run --lto=full //common:ti_dist -- --dist_dir=$DIST_DIR
$ cd ${YOUR_PATH}/ti-aosp-13
$ lunch am62x_var_som-userdebug
$ m
Menu Config
$ cd ${YOUR_PATH}/ti-kernel-aosp/
$ tools/bazel run //common:ti_config -- menuconfig
Porting Drivers Notes
- Actual Kernel source code is in ${YOUR_PATH}/ti-kernel-aosp/common
- Defconfig Used in the kernel is from Google: ${YOUR_PATH}/ti-kernel-aosp/common/arch/arm64/configs/gki_defconfig
- All drivers and SOC infrastructure is via modules and is setup by: ${YOUR_PATH}/ti-kernel-aosp/common/arch/arm64/configs/ti_gki.fragment
- Your driver/ kernel module .ko must be added to GKI module list
module_outs = COMMON_GKI_MODULES_LIST + [
"net/wireless/your_module.ko",
"drivers/spi/your_driver.ko",
]
- Your driver module dependencies must be resolved and must align cd ${YOUR_PATH}/ti-aosp-13/device/variscite/am62x_var_som/BoardConfig.mk
with following
BOARD_VENDOR_RAMDISK_KERNEL_MODULES += \
device/ti/am62x-kernel/kernel/$(TARGET_KERNEL_USE)/zsmalloc.ko \
device/ti/am62x-kernel/kernel/$(TARGET_KERNEL_USE)/zram.ko \
device/ti/am62x-kernel/kernel/$(TARGET_KERNEL_USE)/ti-msgmgr.ko \
device/ti/am62x-kernel/kernel/$(TARGET_KERNEL_USE)/ti_sci.ko \
device/ti/am62x-kernel/kernel/$(TARGET_KERNEL_USE)/ti_sci_pm_domains.ko \
device/ti/am62x-kernel/kernel/$(TARGET_KERNEL_USE)/phy-omap-usb2.ko \
device/ti/am62x-kernel/kernel/$(TARGET_KERNEL_USE)/syscon-clk.ko \
| |
| |
device/ti/am62x-kernel/kernel/$(TARGET_KERNEL_USE)/your_driver.ko