Introduction

This article is to record document outlines the steps for of setting up and running Android Automotive images on Linaro’s Trusted Reference Stack (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 ) using prebuilt images. When completed, you will be able to boot the Android Automotive OS (AAOS) image in a DomU (aka VM) running on top of the Xen Hypervisor using TRS in the Dom0. The AAOS image will utilize the AVA platform's frame buffer (unaccelerated) and use VirtIO serial device to enable keyboard and mouse.

If interested in building from source please refer to the following documents ^[1][2] for details.

Prerequisites

You will need the following to run this demo

• AVA Platform

• Display connected to the VGS?? interface

• Enough disk space

• Linux desktop (x86 is fine)

Prebuilt images

Prebuilt images can be pre-downlaoded as follows:

• 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 the TRS image

We need to flash TRS image can be flashed on either an NVME or a USB stick. It’s recommended to use below the shell script to flash TRS image, you can use below commandsbelow (select the device you wish to flash to):

$ 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 extends the root file system partition to the end of the disk device, thus we can get device to provide sufficient disk space for storing the Android imagesAutomotive OS image.

#!/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 "${DEV}p2"
## Add comment
#sudo /home/leoy/Downloads/e2fsprogs-1.47.0/e2fsck/e2fsck -f "${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 The shell script requires the e2fsck and resize2fs utilities to be at least version 1.47.0 or newer versions), you need to download e2fsprogs and build by yourself. if not available, please download the e2fsprogs source and build it and install it.

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 in a Xen virtual machine

After Once TRS system booted up, you need to download Android Cuttlefish image and uncompress it into a specific folder (eg. /home/leoy/android-cf-mainline/cf due ). 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 Launch Xfce4 windows manager:

# startxfce &

Everything is ready, we can run Android automotive on Run AAOS in a Xen virtual machine:

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

...