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Run Android Automotive on TRS

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Introduction

This article is to record the steps for running Android Automotive images on TRS. In this article, we will share the prebuilt images for easier reproducing this experiment. But in case if you are interested in how to build Android automotive images and build TRS images, you can refer to the documentations [1][2] for details.

Prebuilt images

The TRS prebuilt image is:
https://people.linaro.org/~leo.yan/arm_blueprint/aaos_on_xen/trs-image-trs-qemuarm64.wic.

The prebuilt Android automotive image is: https://people.linaro.org/~leo.yan/arm_blueprint/aaos_on_xen/cuttlefish.tgz.

Flash TRS image

We need to flash TRS image on NVME or USB stick. It’s recommended to use below shell script to flash TRS image, you can use below commands:

$ wget https://people.linaro.org/~leo.yan/arm_blueprint/aaos_on_xen/trs-image-trs-qemuarm64.wic
$ sh flash_trs.sh /dev/nvmeXn1  # for flashing TRS on NVME block device
$ sh flash_trs.sh /dev/sdX      # for flashing TRS on USB stick

This script helps us to extend the root file system partition to the end of the disk device, thus we can get sufficient disk space for storing Android images. 

#!/bin/bash

DEV=$1

sudo parted ${DEV} print

echo "Please confirm if the partition is right?"
while : ; do
	read -n 1 k <&1
	if [[ $k = y ]] ; then
		printf "\n"
		break
	else
		printf "\nExit\n"
		exit 0
	fi
done

echo "Copy image to ${DEV}"
sudo dd bs=4M if=./trs-image-trs-qemuarm64.wic of=$DEV status=progress && sync

sudo growpart $DEV 2
sudo /home/leoy/Downloads/e2fsprogs-1.47.0/e2fsck/e2fsck -f "${DEV}p2"
sudo /home/leoy/Downloads/e2fsprogs-1.47.0/resize/resize2fs "${DEV}p2"
#sudo /home/leoy/Downloads/e2fsprogs-1.47.0/e2fsck/e2fsck -f "${DEV}2"
#sudo /home/leoy/Downloads/e2fsprogs-1.47.0/resize/resize2fs "${DEV}2"
sudo parted ${DEV} print

Note 1: It uses the commands e2fsck and resize2fs for resizing the second partition, if your working distro cannot provide e2fsck and resize2fs for the related new version (as tested they should be at least version 1.47.0 or newer versions), you need to download e2fsprogs and build by yourself.

Note 2: Because USB stick and NVME device have different block naming, you need to comment out lines 23 and 24, and enable lines 25 and 26.

Run Android automotive on Xen virtual machine

After TRS system booted up, you need to download Android Cuttlefish image and uncompress it into a specific folder /home/leoy/android-cf-mainline/cf due to the overlay images contains the absolute path. The commands are:

# wget https://people.linaro.org/~leo.yan/arm_blueprint/aaos_on_xen/cuttlefish.tgz
# wget https://people.linaro.org/~leo.yan/arm_blueprint/aaos_on_xen/aaos_vm.cfg
# wget https://people.linaro.org/~leo.yan/arm_blueprint/aaos_on_xen/u-boot.bin
# mkdir -p /home/leoy/android-cf-mainline/cf/
# tar zxvf cuttlefish.tgz -C /home/leoy/android-cf-mainline/cf/

In the console, we need to firstly launch Xfce4 windows manager:

# startxfce &

Everything is ready, we can run Android automotive on Xen virtual machine:

# export DISPLAY=:0
# xl -vvv create aaos_vm.cfg -c

[1] Xen: maintenance Xen and QEMU repos for TRS
[2] Xen: porting Android Cuttlefish on Xen Virtual Machine

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