How to run whole android system framework on Ubuntu server.

1. Android on Ubuntu
For developer
2010.9.28
Tetsuyuki Kobayashi
1

2. Who am I?
 20+ years involved in embedded systems
 10 years in real time OS, such as iTRON
 10 years in embedded Java Virtual Machine
 Now GCC, Linux, QEMU, Android, …
 Blogs
 http://d.hatena.ne.jp/embedded/ (Personal)
 http://blog.kmckk.com/ (Corporate)
 Twitter
 @tetsu_koba
2

3. Today's topic
 Quick summary of previous
Japan Technical Jamboree
 Running Android on Ubuntu
 Demo!
3

4. Targeted Audience
 Already using Linux in your project
 Have interest in Android
 Thinking how to migrate to
Android
 For developers, not for end-users.
4

5. Quick Summary of previous
Jamboree
 “Reusing your software on
Android”
 http://elinux.org/Japan_Technical_Jamboree_34
 Running your software on Android
 Rebuilding for Android
 Just copy binary
 Running Android on your Linux
 Today, I focus on this. 5

6. Running Android on your Linux
 Running whole Android system
framework on your existing Linux
environment.
 Co-existing Android processes
and your existing Linux processes.
 user space device drivers
 daemon processes
 I show you a quick hack to do this. 6

7. Running Android on your Linux
Android
Android
Your existing Linux user land
Android-patched Linux kernel
Android-patched Linux kernel
7

8. Let's try Android on Ubuntu
 Today, I use Ubuntu as one of the
existing Linux system.
 Running only a few processes on
Ubuntu
 No GUI
 Frame buffer is not used from Ubuntu
 sshd to remote login
 You can use 'apt-get' to install any
packages as you like. 8

9. How to make root file system of
ARM Ubuntu
 'rootstock' is a very nice tool to make arm
root file system on x86 Ubuntu 10.04
$ sudo apt-get install rootstock
$ mkdir arm-ubuntu
$ cd arm-ubuntu/
$ sudo rootstock --fqdn arm-lucid --login
user --password user --seed openssh-server
It takes more than 10 minutes ...
$ mkdir root
$ cd root
$ sudo tar xvpf ../armel-rootfs-201005031740.tgz
9

10. ARM Ubuntu versions
 10.04 (Lucid) requires armv7
 9.10 (Karmic) requires armv6
 9.04 (Jaunty) requires armv5TE
 (Debian lenny requires only armv4T)
 KZM-CA9-01 board has Cortex-A9
(armv7)
10

11. How to run Android on Ubuntu
 Port Android to your board
 Run ARM Ubuntu on your board
with Android-patched Linux kernel
 Put all Android files into /android
on Ubuntu
 Invoke 'sudo chroot /android /init'
on Ubuntu

12. Trouble shooting
 Vold & netd processes caused SEGV
 Some how, I fiexed
 The patch is on my blog
 system/core/libsysutils/src/NetlinkEvent.cpp
 http://blog.kmckk.com/archives/2965337.html
 After patched, vold & netd seems to
work fine.
 SD card is available from Android
12

13. Android lunched successfully
 As of today, configuring LAN/WiFi only
from Ubuntu.
 Internet connection is available on Android
 You can browse internet by Android browser.
 You can use Eclipse to install and debug
Java applications.
 SD memory card is also available.
 SMP kernel works fine on KZM-CA9-01
board(Quad-Core Cortex-A9)
13

14. Result of ps command
user@arm-lucid:~$ ps ax
PID TTY STAT TIME COMMAND
1 ? SLs 0:01 /sbin/init 2417 tty4 SLs+ 0:00 /sbin/getty -8 38400 tty4
2 ? S< 0:00 [kthreadd] 2418 tty5 SLs+ 0:00 /sbin/getty -8 38400 tty5
3 ? S< 0:00 [migration/0] 2421 tty2 SLs+ 0:00 /sbin/getty -8 38400 tty2
4 ? S< 0:00 [ksoftirqd/0] 2422 tty3 SLs+ 0:00 /sbin/getty -8 38400 tty3
5 ? S< 0:00 [watchdog/0] 2424 tty6 SLs+ 0:00 /sbin/getty -8 38400 tty6
6 ? S< 0:00 [migration/1] 2428 ? SLs 0:00 cron
7 ? S< 0:00 [ksoftirqd/1] 2454 tty1 SLs+ 0:00 /sbin/getty -8 38400 tty1
8 ? S< 0:00 [watchdog/1] 2470 ? SLs 0:00 sshd: user [priv]
9 ? S< 0:00 [migration/2] 2483 ? SL 0:00 sshd: user@pts/0
10 ? S< 0:00 [ksoftirqd/2] 2484 pts/0 SLs 0:00 -bash
11 ? S< 0:00 [watchdog/2] 2497 ? SLs 0:00 sshd: user [priv]
12 ? S< 0:00 [migration/3] 2511 ? SL 0:00 sshd: user@pts/1
13 ? S< 0:00 [ksoftirqd/3] 2512 pts/1 SLs 0:00 -bash
14 ? S< 0:00 [watchdog/3] 2520 pts/0 SL+ 0:00 /init
15 ? S< 0:00 [events/0] 2551 ? S<L 0:00 udevd --daemon
16 ? S< 0:00 [events/1] 2552 ? S<L 0:00 udevd --daemon
17 ? S< 0:00 [events/2] 2596 ? SLs 0:00 /system/bin/sh
18 ? S< 0:00 [events/3] 2597 pts/0 SL 0:00 /system/bin/servicemanager
19 ? S< 0:00 [work_on_cpu/0] 2598 pts/0 SL 0:00 /system/bin/debuggerd
20 ? S< 0:00 [work_on_cpu/1] 2599 pts/0 SLl 0:00 /system/bin/rild
21 ? S< 0:00 [work_on_cpu/2] 2600 pts/0 SL 0:05 zygote /bin/app_process -Xzygote /system/bin
22 ? S< 0:00 [work_on_cpu/3] --zygote --start-s
23 ? S< 0:00 [khelper] 2601 pts/0 SLl 0:00 /system/bin/mediaserver
24 ? S< 0:00 [suspend] 2602 pts/0 SL 0:00 /system/bin/dbus-daemon --system --nofork
25 ? S< 0:00 [kblockd/0] 2603 pts/0 SL 0:00 /system/bin/installd
26 ? S< 0:00 [kblockd/1] 2604 pts/0 SL 0:00 /system/bin/keystore /data/misc/keystore
27 ? S< 0:00 [kblockd/2] 2605 pts/0 SLl 0:00 /sbin/adbd
28 ? S< 0:00 [kblockd/3] 2613 pts/0 SLl 0:08 system_server
29 ? S< 0:00 [ksuspend_usbd] 2668 pts/0 SLl 0:00 com.android.inputmethod.latin
30 ? S< 0:00 [khubd] 2671 pts/0 SLl 0:00 com.android.phone
31 ? S< 0:00 [kmmcd] 2672 pts/0 SLl 0:01 com.android.launcher
32 ? S 0:00 [pdflush] 2673 pts/0 SLl 0:00 com.android.settings
33 ?
34 ?
S
S<
0:00
0:00
[pdflush]
[kswapd0] Processes 2701 pts/0
2728 pts/0
SLl
SLl
0:00
0:00
android.process.acore
com.android.bluetooth
2735 pts/0 SLl 0:00 com.android.mms
35 ?
36 ?
S<
S<
0:00
0:00
[aio/0]
[aio/1] of Android 2744 pts/0 SLl 0:00 android.process.media
37 ? S< 0:00 [aio/2] 2764 pts/0 SLl 0:00 com.android.providers.calendar
38 ? S< 0:00 [aio/3] 2776 pts/0 SLl 0:00 com.android.deskclock
39 ? S< 0:00 [nfsiod] 2786 pts/0 SLl 0:00 com.android.email
40 ? S< 0:01 [rpciod/0] 2796 pts/0 SLl 0:00 com.android.quicksearchbox
41 ? S< 0:00 [rpciod/1] 2807 pts/0 SLl 0:00 com.android.protips
42 ? S< 0:00 [rpciod/2] 2814 pts/0 SLl 0:00 com.android.music
43 ? S< 0:00 [rpciod/3] 2821 pts/0 SLl 0:00 com.cooliris.media
2297 ? SL 0:00 upstart-udev-bridge --daemon 2831 pts/1 RL+ 0:00 ps ax
2300 ? SLl 0:00 rsyslogd -c4 user@arm-lucid:~$
2301 ? S<Ls 0:00 udevd --daemon 14
2378 ? SLs 0:00 /usr/sbin/sshd

15. Result of pstree command
Processes of Android
15

16. Summary of this hack
 Use Android patched kernel
 Nothing to modify in Ubuntu
 Screen(framebuffer device) and
key & touch input are used only
from Android
 Very easy. Try it!
16

17. Through this trial, I found …
 Not so difficult to run Android on
the existing Linux system
 Ubuntu has many familiar tools
such as strace, ifconfig, iwconfig...
These are all available with
Android.
 Useful when trying new device driver
17

18. Next step
 How manage I/O devices?
 Frame buffer
 Layered frame buffer and set transparency
 /dev/fb0 for Android, /dev/fb1 for Ubuntu
 How communicate between Ubuntu &
Android?
 At least, socket is available.
 Ashmem for shared memory?
 Binder?
 (I succeed to start Android application from
Ubuntu shell, by some tricky way)

19. Demo!
KZM-CA9-01(Quad core Cortex-A9)
http://www.kmckk.co.jp/eng/kzmca9/index.html 19

20. Q&A
Thank you for listening!
Any comments to blogs are welcome.
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