This document summarizes a presentation about hacking Linux on Android devices. It discusses installing Linux distributions on Android using chroot applications, rooting Android devices, and running x86 emulators on Android. Some key points: 1) Linux distributions like Debian, Ubuntu, and Fedora can be installed in a chroot environment on Android using applications like Debian Noroot, Debian Kit, and Complete Linux. This allows running desktop applications but has storage limitations. 2) Rooting Android devices unlocks more capabilities but voids warranties. Tools like Nexus Root Toolkit make rooting Nexus devices easy. 3) Emulators like Qemu, DOSBox, and Exagear allow running x86 operating systems

1. 1
Hacking with Linux on Android devices
AndroidタブレットでLinuxを色々と遊んでみよう
１、Self introduction 自己紹介
２、Hacking Android 紹介、全体像
３、Android app and Server
４、Linux distributions on Android
・Debian noroot and chroot Linux
・x86 PC Emulations on Android
・Hacking some device(KindleFireTV)
・Recently ARM devices
５、Ubuntu on Windows10 Tablet
6、Nexus7 OS Hacking
・Android own build MultiROM、TWRP
・Custom ROMs
7、Android own build
8、MultiROM hacking
講演：Kenji Shimono
台湾MOPCON2016/10/30 13:00～
Place：International Convention Center
Kaohsiung 高雄國際會議中心
Yancheng, Kaohsiung, Taiwan
This Presentation:
Slideshare & PDF files
publication of my HP
http://kapper1224.sakura.ne.jp

2. 2
自己紹介 Self Introduction
● My pen name: Kapper( Kenji Shimono)
● Twitter account：＠kapper1224
● HP：http://kapper1224.sakura.ne.jp
● Slideshare: http://www.slideshare.net/kapper1224
● ニコナレ: http://niconare.nicovideo.jp/users/59379263
● My Hobby：Linux、*BSD、and Mobile ARM Devices
● My favorite words：Record than experiment important
● Test Model：Netwalker(PC-Z1,T1)、Nokia N900、DynabookAZ、RaspberryPi
Nexus7(2012、2013)、Hercules eCAFE EX HD、Jetson TK-1、
OpenPandora、ARM Chromebook、ZTE OPEN C（FirefoxOS）
台湾Android電子辞書 無敵CD-920、CD-928 and more.
● Recent Activity：
Hacking Linux on Windows10 Tablet (Intel Atom base).
I have been active in the Tokaido Linux User Group.
Hacking of Android Nexus7.
I have recently often use the ARM Chromebook.

3. 3
Recently my activity
1.Linux distributions on Android 2. Electronic Circuit on ARM
3. Ubuntu on Windows10 Tablet 4. Plesentations in Asia(Singapore,Taiwan)
Opensouce Conference
RaspberryPiを使ってLチカ
昔に戻って、電子回路工作を楽しんでます

4. 4
Tokaido Linux Uses Group( in Japan)
●Koedo Linux User Group(Tokyo)
●Tokaido Linux User Group(Yokohama-Nagoya-Osaka)
●LILO Kansai（Osaka)
●Kagoshima Linux User Group(Kagoshima)
There are some Aria in Japan, and one of the Largest
Linux community in Japan.
●Our Developer
Opencocon,Debian,OpenSuse,Mint,LibreOffice,
mobileOS, Embedded Linux,Android,SailfishOS,
Python,Eject,Opcocon,Japanese Inpud Method,
Electronic circuit Hack～

5. 5My Activity OpenSourceConference in Japan
and Tokaido Linux Uses Group
Once it is held in one month
Sapporo
Hokkaido
Tokyo
Hamamatu
Nagoya
Kyoto
Osaka
(KOF)
Shimane
Hiroshima
Oita
Okinawa
Kawagoe(Tokyo)
Hakata
Tokushima
Niigata

6. 6
Today Session今回のテーマ
● Hacking Linux on Android devices.
● Introduce sever and some Android application.
● Add Hacking Linux on Windows Tablet.
● This is English and Japanese presentations Multi-
langugae.

7. 7
Today Session
Bootloader
Kernel
SoC
OS replace
Root
MultiROM
Pkgsrc
NetBSD
Linux
Distributions
chroot
(root)
Mikutter
RemoteDesktop
Debian Noroot
OpenCocon
Easy
Application
only
Difficult
Desktop,server
Office
Haking Developer
Distributer
「End of Life」extended
Target Users
Mikutter app
x86 emu
Windows app
Limited Important
Hacking
Electronic
Circuts

8. 8
Hacking Android easy history
Android ~4.x
Many Chinese Tablet
Many Rooted app
↓
Only install applications
Android～4.2
Nexus7 comming
Bootloader is easy to
unlocked
↓
Easy to Root
Android～2.3
No root devices
Webkit had security bug
Rooted
↓
hacking
Difficult
Easy to root
everyone Install app only

9. 9
PC market and Android
Chinese
Tablet
Smart
Watch
Android
Smart
Phone
Android
Windows
Tablet
Windows
Note PC
iPad
Chromebook
Mac
book
RaspberryPi
Android Stick
１Board PC
Windows
PC
Google
Glass
Mobile PCDesktop PC
iPhone
0 inch 6 inch 10 inch
$200
$100
$500
$1000
Mac
PC
Screen size
ChromeBox
$179~$350
Apple
Watch

10. 10
Hacking Inexpensive PC Classification
Android can operate any Linux distributions too.
Kapper’s Internet search
My point of view
Machine OS Root Replace OS Cost
(US$)
Comment
Chinese Tablet
Chinese Smartphone
Netbook
Android
FirefoxOS
(ARM、MIPS）
◯ CyanogenMod他
Ubuntu、Debian、Arch他
$40
～$300
Low cost
Low spec
Low battery
Android Sticks
Android Box
Android
(ARM）
◯ CyanogenMod他
PicUntu他
$30
～$200
Low cost
High spec
Chromebook
Chromebox
ChromeOS
(ARM、x86)
◯ Ubuntu、Debian他 $90
～$300
High spec
ATOM Windows
Tablet
Windows
Android(x86)
△ Ubuntu他、
Bash、Cygwin
$80
～$300
High spec
UEFI32bit
Windows Stick Windows(x86)
Ubuntu
△ Ubuntu他、Bash、Cygwin $70
～$200
High spec
UEFI32bit
1 Board PC Linux(ARM） ◯ Debian、Ubuntu、NetBSD
FreeBSD他
$10
～$200
RaspberryPi
Bootloader unlock
Android
Smartwatch
Android
（ARM、MIPS）
△ AsteroidOS他 $60
～$200
New
Android wear
Smartwatch
Android Wear
(ARM)
△ AsteroidOS他 $100
～$300
New
High cost
Android Car Navi Android
(ARM,MIPS)
△ After this $200
〜$500
High Cost

11. 11
● What do you want to hacking in Android devices?
１、Office and Editor （using keyboard）
２、Windows and x86 emulations on Android.
３、Mikutter、LibreOffice and desktop application
4、Server application
５、Remote desktop,TeamViewer with RaspberryPi
６、FlashPlayer
７、Electronic circuits and Arduino
8、Re-use Old Android devices
9、FirefoxOS、UbuntuTouch and Moblie OS

12. 12
Remote monitor instead in VNC and RDP viewer
● Use the first basic monitor Instead, remote control
● Use RaspberryPi and Windows VNC terminal
● It is not limited to Android, but let's use if I left
over the model
BlackberryQ5
Chinese Smartwatch
Nexus7+Bluetooth keyboard

13. 13
Re-use for server terminal
● Android have some server applications. Old Android devices
can re-use LAMP and some portable machine.

14. 14
Stroage problem in old Android devices
● Old Android devices are too small stroage problem.
● About /mnt/sdcard is FAT32 format, because Windows can read it.
● In Linux devices, can’t make symbolick link on /mnt/sdcard and
MicroSD FAT３２. If you want to use symbo-
lick link, format Ext or NTFS, and loopback
disk.
● In Android application have Link2SD and
Android Partition Tool,but they are
rooted applications
rm -rf /storage/sdcard0/<directory>
mkdir /storage/sdcard0/<directory>
mount -o bind /storage/sdcard1/<directory> /storage/sdcard0/<directory>
ｓu
mount -o remount,rw /
cp -pr /mnt/sdcard/<directory> /data/sdext2/<directory>
rm -r /mnt/sdcard/<directory>
ln -s /data/sdext2/<directory> /mnt/sdcard/<directory>
busybox ln -s /data/sdext2/<directory> /mnt/sdcard/<directory>
or
Source：Not possible to create a symlink in /mnt/sdcard?

15. 15
Hacking Android
Install Linux Distributions
on Chroot application

16. 16
Install ARM Linux on Chroot
● Chroot is other Linux distribution on Linux
● In Android,Only use Chroot application
● Can’t access to the outside Chroot.
Mount folder only access it.
mount -o bind <directory１> <directory２>
● Chroot use only Root user,
Nomal user use Fakechroot command,
（Debian Noroot is used）
● Kerneｌ is Android based kernel.
Driver and kernel modules based Android.
Android
Linux Device
Ubuntu
Debian
And
other Linux
Ubuntu
Debian
And
other Linux

17. 17
Debian Noroot on Android
● Debian Noroot can be installed in a chroot without taking
root privileges Android apps Debian
● You can use a Bluetooth keyboard, like a notebook PC
● Contents to build a chroot environment in the normal user
privileges use the fakechroot, are viewing the Xorg in
Xserver-SDL
● There are challenges to capacity because storage is based
on the premise visceral / sdcard
● Recent Ver corresponding
with Android4.0 later
● Difficulties in compatibility
that does not move Xserver-SDL
with the old OS
Taiwan Electronic Dictionary
無敵CD-920

18. 18
Desktop applications on Android
Blender on Android Scratch on Android
Debian jessie package over 43,000 desktop app on Android
Hardware driver is difficult on chroot Linux,but can use on Android.
Mikutter about Twitter app LibreOffice on Android

19. 19
List of Chroot applications on Android
Chroot Applications Android
version
CUI or GUI Linux distributions Root comment
Debian Noroot
（Gimp他）
4.3~ Full Auto
XserverSDL
Debian No Install and Xsever
Use much disk
Complete Linux 2.2~ Terminal Debian、Ubuntu、
Fedora、Arch、Open
Suse
Root Many Distribution
GUI installer
Debian Kit 4.1~ Terminal Debian Root Debootstrap
Linux Deploy 2.1~ Terminal Debian、Ubuntu、Fe
dora、Arch、OpenSu
se
Root most support
CentOS
GnuRoot 1.6~ Terminal Debian No Any Android devices
old
GnuRoot debian,
Fedora, Gentoo
1.6~ Terminal Debian,Fedora,
Gentoo
No On GNURoot
old
GnuRoot Wheezy X 1.6~ Xserver Debian No On GNURoot
old
AndroLinux 3.0~ Terminal Fedora,CentOS ？ CentOS
APKLinux 4.0.3~ Terminal Bare-Bone Root Own packages
Lil' Debi 2.1~ Terminal Debian Root Debootstrap
Chroot applications are different OS and Android version.
Terminal base chroot application is small size on stroage.GUI is Xserver-SDL and VNC.
Android can operate any Linux distributions too.
Kapper’s Internet search

20. 20
Rooting Android
● In rooted Android, many applications and OS can
operate.But no warranty for manufacturing.
● Rooted Android
１、Connect USB and rooting applications on
Windows
２、Unlock Android bootloader
３、Use rooting application on Android
● Why wouldn’t you root?
１、OS Replace、chroot、symbolick link
２、Chenge security,internal access、terminal
３、OverClock
4、Move app in SDCard、Delete app

21. Nexus Root Toolkit
● Windows GUI application for Nexus7
easy Unlock and rooted
１、Nexus Root toolkit app download
２、Google USB driver install in Windows
３、Connect USB to Nexus7
４、Only click, Unlock and rooted
Nexus Root Toolkit

22. Rooting applicaions
● Recently Rooting app in GooglePlay and so on.
● For example, Kingo Android Root.
Many devices and manufacture supported.
There are windows and android applications.
Use at your own risk.
Supported Manufacture

23. 23
Android Terminal and Busybox
● Linux basic command can use Terminal
Emulator and Busybox in Andoid.
● Busybox is basic CUI tool set,command can
control Android system （cp,wget,w3m～）
● If you want to change system,you need
rooted devices.
Android Terminal Busybox

24. 24
Debian Kit and Complete Linux
● App to put the package to build a chroot environment on
Android with apt-get. Debian reduction can be.
● I can server of the Android simple. and those that do not
need as there are root of.
● Debian Kit because it is a mechanism that can be used is
apt-get at the root environment of the parent process of
Android, has a high degree of freedom (high risk?)
● Also old environment
for the Debian Noroot
can not be put
Complete Linux

25. 25
TightVNCserver and VNCviewer
● Alternate of the easiest X server VNCserver
● If you invoke the TightVNCserver in a chroot environment
and easily launched the X environment on Android.
Localhost:8080 (127.0.0.1)
● Of course, it is also possible to use by remote control.
Complete LinuxVNC Viewer

26. 26
Use Xserver-SDL alone on Android
● It can also be used alone Xserver-SDL, which is
also used Debian noroot as an alternative to the
Xserver.
● From how to use activates the Xserver-SDL, from
the terminal in Chroot environment,
env DISPLAY=xxx.xxx.xxx.xxx:0 lxsession &
The activated Show Xserver-SDL again on Android
Complete LinuxXserver-SDL

27. 27
Hacking Android
x86 Windows emulations

28. 28
Play PC Emulation on Android
● Windows and applications play PC emulations
on Android,but too slow (=first pentium)
● PC: Bochs,Qemu,DOSBox,Limbo（Qemu）
MAC:vMacMini、Basillisk2
● On Qemu,Windows and NetBSD can
operate（after Qemu ver1.5 on ARMdevices）
NetBSD Live images
Windows9x、2000

29. 29
ｘ８６ Emulations on ARM Devices
Emulation OS Root
Device
Emulated OS Spec Comment
Qemu Linux
Android
RaspberryPi
No Windows
MacOSX?
Linux,*BSD
Slow Tegra K-1
⇒Pen 266MHzⅡ
Ver1.5〜(ARM GUI)
Qemu+Wine Linux
Android
RaspberryPi
Required +Windows APP Slow Difficult
kernel 3G/1G only
chroot environment
Exagear-Desktop Linux
RaspberryPi
Required Ubuntu,Debian Fast Tegra K-1
⇒Pen4 1.8GHz
Exagear-Desktop
+Wine
Linux
RaspberryPi
Required Ubuntu+Wine
Windows APP
Fast Tegra K-1
⇒Pen4 1.8GHz
DOSBox Linux
Android
RaspberryPi
iOS,DS,PSP
No DOS,
WIndows9x
(i386〜i586）
Slow Tegra K-1
⇒Pen 266MHzⅡ
NEON Supports
Voodoo1+Glide
Bochs Linux
Android
RaspberryPi
iOS,PSP
No Windows〜XP
(i386〜x86-64)
Linux,*BSD
Slow Tegra K-1
⇒Pen 266MHzⅡ
XNP2
（PC-98
Emulation）
Linux
Android
RaspberryPi
iOS
No DOS、
Windows95？
Slow Tegra K-1
⇒？
Internet dogmatic investigation of Kapper (if I wrong it, I'm sorry. )
VMWare and Virtualbox are not working on ARM devices.(Only x86)

30. 30
Windows game with ExaGear Mobile on Android
● Exagear Mobile（RPG、Strategy）is Android applications
x86+Wine emulations.
● Play some Windows app and game (about Diablo1,2）
● Copy Windows PC’s (C/:Program files/〜) in Android

31. 31
Play Windows95 on DOSBox
● DOSBox can operate Windows9x on any devices
● Android,iOS,RaspberryPi,3DS,XBOX,PS3・・・
● Play old game, Cad, language and office.
● My slideshare「beginner for DOSBox」
Please read it!
Windows95

32. 32
Old Mac emulateion on BasiliskⅡ
● Old 68K MacOS emulation on BasiliskⅡ.
● Some game,office and so on.
● Let’s play Old MacOS on Android.
Basilisk2 on Old MacOS

33. 33
Recently my Hacking
( today side story)

34. 34
Hacking Android devices and OS
1.Kindle fire TV、Kindle Fire5 2. Chromecast
3. IS01, Dynabook AZ(AC100) 4. HMDI stick type PC, Chromebit
They use Allwinner,Rockchip CPU. Ubuntu can install.
Chroot Debian,Ubuntu.They have not some devices,
But they are easy to Hacking Linux!
Install ES File Explorer, Kindle can install APK file
based Android application, DebianNoroot too.
Rooted Kindle can install GooglePlay.
And supported CyanogenMod
install Kindle,like Android.
Chromecast is Android Core. So Chromecast can
Install custom ROM「rCast」「PwndCast」,
Stand-alone movie, audio, and so on.
Old Rooted Android devices can install CyanogenMod,
And to use Chroot Debian,Ubuntu.
Old Android devices Hacking is very interesting.

35. 35
Unix on Windows Tablet
● Cygwin and Emulation Unix onWindows Tablet
1.Bash on Windows( Ubuntu base）
２.Cygwin
３.Emulation(qemu,virtualbox,VMware他)
４.Legasy,UEFI 64bit BOIS dualboot
Linux device driver is not still supported.
QemuCygwin

36. 36
Recently my Hacking
Hacking Linux on x86 Windows Tablet
( today side story)

37. 37
Test Model PC
● ICONIA W500S(AMD C-50) 2011/4 Legacy BIOS
● ONKYO TW317A5（Oak-Trail)2010/9 LegacyBIOS
● Acer W3-８１０（Clover-Trail）２０１3/7 UEFI 32bit
● Asus T100TA-DK32(Bay-Trail)2013/10 UEFI32bit
● PC-TW708/CAS(Bay-Trail) 2015/10 UEFI 32bit
● WIN-70B(Bay-Trail) 2015/6 UEFI 32bit
● Chui VI8 Plus(Cherry-Trail) 2016/1 UEFI 64bit

38. 38
Recently PC’s boot process for Windows and Linux
● Ubuntu official ISO is not supported to both 32bit and 64bit.
Legacy
BIOS
Legacy
BIOS
(USB,
ISO)
Grub2
(32,64bit)
Install ISO
Ubuntu
(32,64bit)
Legacy
BIOS
(Wubi)
UEFI
32bit
(USB,
ISO)
UEFI
32bit
(Wubi)
Hard
(32,64bit)
Grub2
Wubi
(32,64bit)
auto
Install Wubi
Ubuntu
(32,64bit)
UEFI
(32bit)
Grub2
(64bit)
32bit
Install ISO
Ubuntu
(64bit)
Hard
(64bit)
Grub2
Wubi
(32,64bit)
auto
Install Wubi
Ubuntu
(64bit)
Fix
Not
Problem
Not
Problem
After
install
grub2 32bit
Fix install
wubi for
Ubuntu16.04
rev311
2016/8/2!
Only
32bit
Surface
Notebook
UEFI
64bit
UEFI
(64bit)
Grub2
(64bit)
Install ISO
Ubuntu
(64bit)
Hard
(64bit)
Not
Problem

39. 39
Install ISO for Ubuntu 16.04
● Required
１．Windows Tablets
2. USB Memory(>2GB) install Ubuntu16.04 ISO
3. USB-MicroUSB OTG cable
4. USB hub
5. USB keyboard
6. USB mouse
7. USB Wifi adapter

40. 40
Install ISO for Ubuntu 16.04
● Install USB memory Ubuntu16.04 in Windows Tablet.
● Grub2-efi-ia32 can’t install amd64 Ubuntu 16.04.
So you can’t boot Grub2 32bit. Reboot and install 「apt-get」
Over 8GB
Ubuntu16.04
Install Error grub-efi-ia32
Installer crash and reboot

41. 41
Android（Nexus7）
OS replace

42. 42
Install Linux distributions on
Android(Nexus7)
● About 5 type install
１、chroot install Linux distributions
２、Launcher type virtualization OS
３、Emulations OS
４、Install MultiROM and custom ZIP ROM images
５、Install firmware,bootloader and OS(dual boot)

43. 43
Android-own build status
Internet dogmatic investigation of Kapper (if I wrong I'm sorry. Correct)
◎：Official Support、◯：Official reports、△：Users reports
Distributions Version Installer Multirom Root Compatible devices
Factoryimg ~5.1.1
~6.0.4 ◎ ○ △ Nexus(google)
CynanogenMOD ~6.0.x
◎ ○ ○ many
AOKP
◎ ○ ○ many
ParanoidAndroid
○ ○ ○ many
ClockworkMOD
○ ○ ○ many
Debian GNU Linux 〜8.x
○ ○ ○ MultiROM移植
Ubuntu Linux
○ ○ ○ MultiROM移植
FirefoxOS
○ ○ △ Own build
AOKP,CyanogenMOD
Based kernel
Ubuntu Touch
Ubuntu Phone ◎ ○ ○ Nexus7(2013）
4、5、10、6
Tizen △ △ △ ？
SalfishOS ~2.0 △ △ △ Nexus5

44. 44
FirefoxOS２．５ Launcher
● FirefoxOS2.5 Launcher is Android Home app that can use
FirefoxOS and app. Install apk file on Android.
● English only. Difficult use the other languages.
● Test FirefoxOS if you want to use Other OS on Android.
FirefoxOS2.5Launcher
FirfoxOS HP
http://www.mozilla.org/en-US/firefox/os/

45. MultiROMとTWRP
● MultiROM can select and boot some OS image ROM when boot devices.
Need Rooted and Unlock bootloader.
● TWRP is custom recovery 「TWRP」,when 「TWRP」install you can use
many OS multi-boot and backup. NexusRootToolkit can easy install it.

46. CyanobenMod
● CyanogenMod Inc. and Android4.x to the various devices in one of their own
build a number of Android that are customized are developing.
● Include the formal and informal support, corresponding to 220 devices
● Development from the firmware (boot loader) to the OS image.If a device that
is official support, it can be installed with one click without taking root.
● Installation has a difficult but also many operations reported to the local
device,It has contributed to the aftermarket of older models.
● Since correspond to the regular even Nexus7,
it is easy to install.
CyanobenMod9

47. FirefoxOS
● You can install and use FirefoxOS in Nexus7.
● Custom ROM required Since then replacement
of FirefoxOS ROM.(supported device)
FirefoxOS SimulatorFirefoxOS

48. Ubuntu Touch
● Nexus7 2013 is Ubuntu Touch supported now.
● Installer and boot loader set
● The use of Ubuntu touch is Nexus series only.
Ubuntu TouchUbuntu Touch

49. 49
Nexus7 on Ubuntu13.04
● In2013 ,Ubuntu 13.04 Desktop can install in
Nexus7 ２０１２.
● UbuntuTouch had been supported Nexus7, but
「End of Life」now. Few people use Ubuntu 13.04
and Ubuntu Touch on Nexus7 2012 now.
Ubuntu13.04 Nexus7 Ubuntu13.04 Nexus7

50. 50
MultiROM support Debian、Ubuntu、Arch
● In 2015/8, MultiRom supported Debian and the
others, Debian can install and dualboot MulitROM

51. 51
CyanogenMod own build
＊）To Linux developer
If you want to make own Android

52. 52
CyanogenMod build
● Android is opensource project,you can make and
build own Android （FirefoxOS too）
● Build PC specs
OS：Ubuntu（on VirtualBox）
CPU：Corei5～７
memory：4GB～
HDD：100GB～
Build time:8〜24Hr
● Build guide in Official
CyanogenMod HP.
Copy and paste.
● First,Let’s Install
official Image.
Officially-Supported CyanogenMod

53. 53
Hacking Android devices and OS
2.Customize file and data
3. Build sourcecode 4. Kernel build（if kernel customized）
1. Download sourcecode
This is digest version.
Let’s see CyanogenMOD
Website!
1. Research Android devices name
2.Download sourcecode vender
3.Directory setthings
3.Directory setthings
4.Files customized
5.make test recovery Image
6.build CyanogenMod
7.add XML overilay
8.build Linux kernel and
kernel module

54. 54Mechanism of the bootloader on ARM devices
and compare x86 devices.
Devices ROM RAM MBR
(Disk）
Kernel init Login Features
x86~
Linux
BIOS &
DISK
bootloader
ARM
Android
Bootloader
unlock is
important
x86-
Chrome
book
After the
bootloader
in
common
ARMLinux
Distribution
Chrome
book
After the
bootloader
in common
with x86
BIOS,UEFI
Device
Bootdisk
GRUB
LILO
Kernel
Driver
Daemon
and also
Initialization
driver
RAMtransfer
Kernel
transfer
Kernel
rootfs
loading
CUI
Xorg
Kernel
driver
rootfs
Devices
Daemon
Context
manager
Zygote
Initialization
driver
RAMtransfer
Bootloader（U-boot）
Kernel
transfer
Kernel
rootfs
loading
Kernel
Driver
Daemon
and also
CUI
Xorg
Dalvik VM
Android
GUI
In the case of ARM, it transfers the bootloader from FlashROM in
RAM, and is configured to read the Kernel and rootfs.Bootloader that
is being written to ROM is so called "firmware". In the case of Android,
it is required Unlock “firmware”.
Android Bootloader（ROM）MLO
MLO
Initialization
driver
RAMtrasfer
Kernel
transfer
Kernel
Rootfs
loading
Bootloader（U-boot）MLO
Kernel
Driver
Daemon
And also
CUI
Xorg

55. 55
Ubuntu installer SourceCode in Android
● Only download Wget OS-image and install fastboot command.
● Connect USB cable Windows(Linux) to Android devices.
set -e
echo "$COUNTER"
echo "# Begining Ubuntu Core Nexus7 installation"; sleep 2
COUNTER=$((COUNTER+20))
echo "$COUNTER"
echo "# Erasing boot partition"
sudo -Sp '' -- fastboot erase boot <<<"${SPW}"
COUNTER=$((COUNTER+20))
echo "$COUNTER"
echo "# Flashing boot partition"
sudo -Sp '' -- fastboot flash boot ./"${IMAGES[0]}" <<<"${SPW}"
COUNTER=$((COUNTER+20))
echo "$COUNTER"
echo "# Erasing userdata partition"
sudo -Sp '' -- fastboot erase userdata <<<"${SPW}"
COUNTER=$((COUNTER+20))
echo "$COUNTER"
echo "# Flashing Ubuntu Core root file system"
sudo -Sp '' -- fastboot flash userdata ./"${IMAGES[1]%.*}" <<<"${SPW}"
COUNTER=$((COUNTER+20))
echo "$COUNTER"
echo "# Rebooting device"; sleep 2
sudo -Sp '' -- fastboot reboot <<<"${SPW}"
) |

56. 56
Chinese Tablet ARM processer
Processer Hack app Bootloader Root SDboot device Kernel Comment
RK3066,RK2926
RK3088,
RK3188,RK3268
rkflashkit
create-
sdcard.7z
U-boot
Linuxium
◯ ◯ MK802~8 RK3*** 主流
Hacking tools
Ubuntu
AllwinnerA10〜20
AllwinnerA31
BROM
BerryBoot
Debian-
Installer
U-boot
Barebox
Coreboot
◯ ◯ CubieBoard SUNXI
Lichee
主流
Hacking tools
Debian
MT8389
MT6577
Magic
TWRP/CWM
SPFlashTool
U-boot ◯ ◯ ThunderK
ernel
主流
MediaTek
Exnos5250 U-boot ◯ ？ Arndale Board Samsung
Snapdragon U-boot ◯ ？ Qualcomm
K3V2 fastboot U-boot ◯ ？ Hisilicon
iMX6 U-boot ◯ ◯ Linao Freescale
Atom Z3735 UEFI ◯ 〇 Windows Tablet
ATM7029 U-boot ◯ ？ Nvidia
Tegra U-boot ◯ ◯ DynabookAZ Actions
OMAP4470 U-boot ◯ ◯ End of Life
My internet search
One of some CPU manufacture provide Rooting app and bootloader hacking app.

57. 57
Android custom bootloader
● In some ARM-chip devices, some custom bootloader
supported(about MultiROM,U-Boot,coreboot and others).
● RockchipRK3188 have 「Linuium」 Grub-like ROM
botloader、they can boot NAND and SD Card OS images.

58. 58
-MultiROM and ZIP-ROM image build