User Guide

System Requirements

Recommended system requirements for Host:

  • CPU: 4 cores or more

  • RAM: 8 GB or more

  • Hard-Disk: 250 GB

How to install this release

Celadon build steps

Follow the development environment set up instructions in for Celadon build host setup.

# Install additional development package
$ sudo apt install libjson-c-dev

Manifest Link:

Steps to sync to this release:

# Init with the default manifest
$ repo init -u

# Copy the CIV manifest and use it
$ cp <source path>/CIV_03.22.03.37_A11.xml .repo/manifests/
$ repo init -u -m CIV_03.22.03.37_A11.xml
#NOTE : Manifest tag will change according to the latest release

# Sync the code
$ repo sync -c -q -j${nproc}

Step to generate the Android* Image:

    # Perform the environment setup from directory where repo is initialized
    $ source build/

    # Select userdebug variant
    $ lunch caas-userdebug

    # Start the build
    # To enable avx optimizations for CML/EHL, BUILD_CPU_ARCH=kabylake could be
    appended to the make command.
    # Without this flag, default architecture is silvermont which exercises sse4.1 features.
    $ make flashfiles -j $(nproc)

    # Build output (CIV flashfiles)
    $ find out/target/product/caas/ -name caas-flashfiles-*.zip

# Ensure below host scripts and patches are available post build

# Host scripts
    $ find out/target/product/caas/scripts -type d

    # Host patches
    $ find vendor/intel/utils/host -type d
    $ find vendor/intel/utils_vertical/host -type d

Prerequisites and host kernel build steps:


  • Install Ubuntu* 18.04 LTS

  • If operating behind a corporate firewall, setup the proxy settings

  • Install the following packages

$ sudo apt install -y git fakeroot build-essential ncurses-dev xz-utils libssl-dev bc flex libelf-dev bison rsync kmod cpio

Host kernel build steps

# Sync kernel
# Note that this will pick up the latest on the branch
$ git clone -b 5.4/yocto

# Change directory
$ cd linux-intel-lts

# Checkout to  specific commit (Refer to release notes for SHA ID)
$ git checkout lts-v5.4.209-yocto-220817T175100Z

# copy kernel config
$ cd <source path>
$ wget
$ cp x86_64_defconfig .config
$ echo ""| make ARCH=x86_64 olddefconfig

# Make kernel debian package
$ make ARCH=x86_64 -j16 LOCALVERSION=-lts2019-iotg bindeb-pkg

# To find output files
$ find .. -name "*.deb"

# Copy built .deb packages to use during Installing Ubuntu host kernel
$ cd ..
$ cp *.deb <target path>

DUT setup

Hardware details:

  • HW Comet Lake (CML) NUC DUT details
    • NUC10FNH Intel® Core™ i7-10710U CPU

    • BIOS Version FNCML357.0039.2020.0312.1734

  • HW Elkhart Lake (EHL) CRB DUT details
    • For EHL A0 CRB, please ensure using BIOS version EHLSFWI1.R00.2233.A07.2006180202 or later

    • For EHL Bx CRB, any BIOS version would do.

  • HW Tiger Lake (TGL) RVP DUT details
    • TGL BX RVP

    • BIOS Version TGL1FUI1.R00.3412.A03.2010150719 and beyond

BIOS setting:

  • Intel® Virtualization Technology (Intel® VT)

    • Settings: Security -> Security Features -> Intel Virtualization Technology: Enabled

  • Intel® Virtualization Technology (Intel® VT) for Directed I/O (Intel® VT-d) TBU

    • Settings: Security -> Security Features -> Intel VT for Directed I/O(VT-d): Enabled

  • Secure Boot
    • Boot -> Secure Boot: Disabled


The menu structure may differ due to BIOS differences

Host setup


  • Install Ubuntu 20.04 LTS

  • If operating behind a corporate firewall, setup the proxy settings

  • Disable Automatic suspend in host: Settings -> Power -> Suspend & Power Button -> Automatic suspend -> Off.

Setup Ubuntu host:

# Reboot into the Ubuntu host image
    # Change directory
$ cd ~

# Stop unattended upgrades services and edit /etc/apt/apt.conf.d/20auto-upgrades to as below.
$ sudo systemctl stop unattended-upgrades.service
$ sudo systemctl disable unattended-upgrades.service
$ sudo systemctl mask unattended-upgrades.service
$ sudo vi /etc/apt/apt.conf.d/20auto-upgrades
APT::Periodic::Update-Package-Lists "0";
APT::Periodic::Download-Upgradeable-Packages "0";
APT::Periodic::AutocleanInterval "0";
APT::Periodic::Unattended-Upgrade "0";

# Reboot the system
$ sudo reboot now

# Copy the artifact
$ cp <source path>/caas-releasefiles-userdebug.tar.gz .

# Extract files
$ tar xzvf caas-releasefiles-userdebug.tar.gz

Installing Ubuntu host kernel

# Copy the deb files generated from build kernel instructions
$ cp <source path>/*.deb .

# Install the deb files
$ sudo dpkg -i *.deb

#set GRUB to default boot to install kernel
$sudo vi /etc/default/grub
#change GRUB_DEFAULT line like below to default to
GRUB_DEFAULT='Advanced options for Ubuntu>Ubuntu, with Linux 5.4.209-lts2019-iotg'

#Ubdate GRUB to take in above changes
$ sudo update-grub
$ sudo reboot now
  • After reboot completes, select to use IOTG kernel release in Ubuntu menu as per build kernel instructions

# Check kernel id after reboot
$ uname -r

Run Celadon host setup

# Prepare
$ chmod +x ./scripts/
# Update the host
# If prompted, answer y to go ahead with changes
# Note: CiV guest autostart service could also be auto created during setup
  (details see section "Auto start of CiV")
# Setup option 1 example:
# GVT-d setup without CIV guest autostart service creation
$ sudo -E ./scripts/ -u headless
# Setup option 2 example:
# GVT-d setup with CIV autostart service with desired CiV guest startup options.
$ sudo -E ./scripts/ -u headless --auto-start "-m 4G -c 4 -g GVT-d --passthrough-pci-usb --passthrough-pci-wifi --battery-mediation --passthrough-pwr-vol-button --guest-pm-control --guest-time-keep --allow-suspend"

Guest OS setup:

Creating Celadon guest image


This needs to be done at least once on a properly setup Ubuntu host to create the guest image for testing.

# Change directory
$ cd ~

# Generate Celadon guest image from caas-flashfiles.
# the script and flashfiles have already been extracted from caas-releasefiles-userdebug.tar.gz earlier
# wait for "Flashing is completed" msg from script.
$ sudo -E ./scripts/ --display-off

# Note:
# if you want to flash guest image to dedicated partition (required for using Android secure data erase feature).
# please use below command where partition is the partition device name. Eg. /dev/sda3
$ sudo -E ./scripts/ -d <partition> --display-off

Launching Celadon with GVT-d


As this is a GVT-d setup, the host display will be replaced by the Android screen.Therefore it is necessary to establish a SSH connection to host first, and then launch CIV from the SSH console.

# Before launching CIV, Ubuntu host must be in console login for GVT-d
# If you see that Ubuntu host has booted up into graphical login, perform the following to reboot to console login.
# Otherwise you can skip this step
$ sudo systemctl set-default
$ sudo reboot now

# If already in console login, run the script to start CIV in GVT-d mode
# the script has already been extracted from caas-releasefiles-userdebug.tar.gz earlier
$ cd ~
$ sudo -E ./scripts/ -g GVT-d

# if you want to boot guest image flashed in dedicated partition (required for using Android secure data erase feature).
# please use below command where <partition> is the guest image partition device name. Eg. /dev/sda3
$ sudo -E ./scripts/ -g GVT-d -d <partition>

To debug the guest, connect to the guest console from another shell:

# Connect to Celadon guest console.
$ cd ~
$ sudo socat unix-connect:./kernel-console stdio

Enable keyboard and mouse

You can enable a keyboard and mouse either via USB host passthrough option or add the extend command to Via add extend command parameter of to pass through selective devices

# Retrieve the vendorid and productid
# In this example, 046d is vendor id, c06a is product id
$ lsusb

# Bus 004 Device 003: ID 046d:c06a Logitech, Inc. USB Optical Mouse
# Add extend command when start guest
$ sudo -E ./scripts/ -g GVT-d -e "-device usb-host,vendorid=0x046d,productid=0xc06a"

Via USB host passthrough parameter of

# Note: all connected USB devices will be passthrough to Android with USB host passthrough option
$ sudo -E ./scripts/ -g GVT-d --passthrough-pci-usb

Change guest VM memory and number of CPUs: The default script is setup for 1 cpu and 2G ram when no addition memory/cpu options specified. Below example shows guest start configuration for 4 cores, 4G ram.

# Add -m option to specify 4G of memory
# Add -c option to specify 4 cpu cores for guest VM
$ sudo -E ./scripts/ -m 4G -c 4 -g GVT-d

Optional: Below is a sample script for providing maximum ram and number of cpu settings to guest VM automatically based on hardware platform available if so desired.

# Change to auto detect and configure max ram and cpu for guest based on hardware platform
$ sudo -E ./scripts/ -m $(($(free -m | awk '{ if ($1 == "Mem:") { print $2 }}')-2048))M -c $(nproc --all) -g GVT-d

Device passthrough options for launching CiV (Passthrough Device features)

  • GPU host partition USB host wifi audio power and volume buttons BT ethernet thermal battery sd card partition /dev/mmcblk0p1

  • Validate Comet Lake (CML), Tiger Lake (TGL), and Elkhart Lake (EHL) platforms passthrough command:

sudo -E ./scripts/ -m 4G -c 4 -g GVT-d -d /dev/sdXX --passthrough-pci-usb --passthrough-pci-wifi --passthrough-pci-audio --passthrough-pwr-vol-button --battery-mediation --thermal-mediation --guest-pm-control --guest-time-keep --external-wakeup-mode --allow-suspend -b /dev/mmcblk0p1
  1. The guest image must be created with a dedicated host partition by using the -d <guest-image partition device> option, where <guest-image partition device> is the block partition device name such as /dev/sda3. See earlier sections Creating Celadon guest image and Launching Celadon with GVT-d for required setup. This setup is required to enable support for Android secure data erase feature. When the -d <partition> option is used with, the host side utility secure_erase_daemon will also be run. This daemon performs secure erase of the userdata section in the host partition during Android wipe data process triggered by factory reset or recovery wipe data operations. The Recovery UI/recovery.log will show “SECURE ERASE SUCCESS” upon success or “Secure Erase failed, format directly” on failure if secure erase of partition is not supported by hardware block device.

  2. The --passthrough-pci-usb USB host passthrough also passes through the BT adapter connected via USB.

  3. Ethernet lan is in same IOMMU group as audio for CML/EHL/TGL, so when using the --passthrough-pci-audio host lan will not be usable since lan is passed through also automatically.

  4. An SD card must be inserted before starting the Android guest for the SD card mediation option -b /dev/mmcblk0p1.

  5. The --battery-mediation option is required for battery mediation to VM.

  6. The --thermal-mediation option is required for thermal mediation to VM.

  7. The --guest-pm-control option is required for power management of the host by the guest. Also refer to Supplementary guide for power and volume key support for suspend/resume via power key.

  8. The --guest-time-keep option is for synchronization of VM time settings back to the host platform. Please ensure time synchronization services on Ubuntu host have been disabled first when using this option, eg. via sudo timedatectl set-ntp off. The Guest RTC alarm sync to host feature is enabled by default when –guest-time-keep option is used. When used together with –guest-pm-control, this feature will allow Android to set alarms to wake the host (and Android guest) from suspend state upon alarm expiry. If you use the –guest-time-keep and –guest-pm-control options, please also enable the –external-wakeup-mode option. it will help to avoid synchronization issue during suspend/resume.

  9. The --external-wakeup-mode option is to disable Qemu internal timeout alarm for suspend/resume and use host RTC timer instead. This option should be used together with the --guest-time-keep and --guest-pm-control options.

  10. The --passthrough-pwr-vol-button option is for passing physical hardware power and volume button press (if present) and virtual key presses to VM via sendkey utility. See Supplementary guide for power and volume key support for more details on what is provided by this option.

  11. The --allow-suspend option is for allowing Android to enter suspend when idle.

  12. In case the options --passthrough-pci-usb, --passthrough-pci-wifi, and --guest-pm-control are all used together, as well as the Auto start of CiV feature is enabled, we recommended to make the changes shown below in the Host to make WiFi and Bluetooth to be more stable.

  • Add GRUB_CMDLINE_LINUX=modprobe.blacklist=xhci_pci modprobe.blacklist=xhci_hcd modprobe.blacklist=iwlwifi to /etc/default/grub file

  • Modify

# In function set_pt_wifi(), delete
# local WIFI_PCI=$(lshw -C network |grep -i "description: wireless interface" -A5 |grep "bus info" |grep -o "....:..:....")
# Use below line instead
# local WIFI_PCI=$(lspci -D |grep -i -E "Network controller.* Wireless|Network controller.* Wi-Fi" | grep -o "....:..:..\..")

Auto starting CiV (using GVT-d)

The Android CiV guest can be made to start automatically as a service on host system boot and be the default configuration after setup. One way to implement this solution is shown below. Here it is assumed that CiV has been installed to /home/<user> directory, where <user> is the ubuntu host username. Modify ExecStart accordingly for the options desired for CiV guest startup.

$ sudo vim /etc/systemd/system/civ.service

# update file civ.service with below changes
Description=CiV Auto Start


ExecStart=/bin/bash -E /home/<user>/scripts/ -g GVT-d --passthrough-pci-usb --passthrough-pci-wifi --passthrough-pci-audio --passthrough-pwr-vol-button --battery-mediation --thermal-mediation --guest-pm-control --guest-time-keep --allow-suspend


# Reload daemon and start civ service
$ sudo systemctl daemon-reload
$ sudo systemctl start civ

# Enable auto start of CiV at every reboot of host CPU
$ sudo systemctl enable civ

Supplementary guide for power and volume key support

Power and volume key support for guest VM.

  1. Start Android with pwr/vol button passthrough option

$ sudo -E ./scripts/ -g GVT-d --passthrough-pwr-vol-button --allow-suspend
  1. Send the following adb command to enable Developer options

$ adb shell settings put global development_settings_enabled 1
  1. Disable “Stay awake” setting within the Developer options (Settings -> System -> Developer options)

  2. Use below commands to test set volume and power button at host or press physical buttons if present

# Volume Functionality:
./sendkey --vm 0 --volume up => Increases volume in CIV
./sendkey --vm 0 --volume down => decreases volume in CIV

# Power Functionality:
./sendkey --vm 0 --power 0 => Suspend/Resume in CIV
./sendkey --vm 0 --power 5 => long press of power key for 5 seconds. Displays power options in android.

Acronyms and terms

  • Stable Releases (IoT) - IOTG overlay on top of Celadon

  • CIV - Celadon in Virtual Machine




  • GVT-d : Intel® Graphics Virtualization Technology -g (Intel® GVT-g): virtual graphics processing unit (vGPU) (multiple VMs to one physical GPU)