android-x86.org Android-x86 Project Marshmallow Porting https://docs.google.com/presentation/pub? id=1mUQDFaERipwQQWHiZxmkvwPXNPlqtdv9lXrY5hPoUJ4 黃志偉 [email protected] 2015/11/28 http://cwhuang.info
Welcome message from author
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
android-x86.org
Android-x86 ProjectMarshmallow Porting
https://docs.google.com/presentation/pub?id=1mUQDFaERipwQQWHiZxmkvwPXNPlqtdv9lXrY5hPoUJ4
2015/11/28http://cwhuang.info
android-x86.org
Agenda
●Introduction: what, why, how?●History and milestones, current status●How to develop android-x86●Inside android-x86●App compatibility issues●What we contributed?●Difficulties and challenges●Live Demo?
android-x86.org
Introduction
●What's Android-x86?●Why needs Android-x86?●How can we do it?
android-x86.org
What's Android-x86 ?
●An open source project aimed to provide a complete solution for Android on x86 devices.
●At first we use ASUS Eee PC and virtual box as the reference platform.
●Some vendors donate tablets to us, like Tegatech Tegav2, 4tiitoo AG WeTab and AMD.
●BSP (Board support Package) for x86 platform
android-x86.org
Why needs Android for x86?
●Android is an open source operating-system designed for arm platform●But it's open source, we can port it to other platforms?
● Mips porting (MIPS Technology)● PowerPC porting
● Mentor Graphics● Power.org
● x86 porting
android-x86.org
But what are the benefits?
●Understanding Android porting process●The x86 platform is widely available●As a test platform, much faster than SDK
emulator●Android-x86 on vbox / vmware●Suitable for tablet apps
android-x86.org
Android architecture
android-x86.org
How to do that?
●Toolchains – already in AOSP, but old...●Kernel – almost works, except power management, drivers●Libraries – bugfixes or improvements
● Building time – bionic, llvm, ppp, v8, ...● Runtime – bluetooth, vold, ...
●HAL (hardware abstraction layer)●Framework / app●Android 4.0 (ICS) is the first Android version that can be built for x86 without patches. However, to make it run on a real x86 device, there are still a lot of work to do.
android-x86.org
History (2009)
●Mar: Not maintained, need patches●Apr: Patch hosting for android x86 support by
Yi Sun <beyounn at gmail.com>●May: Hard to maintain and sync with upstream●Jun: Need a common, complete code base●Jul: android-x86.org, release v0.9●Aug: Build 20090820●Sep: Build 20090916●Oct: Build 20091024●Nov: Android-x86 1.6 released●Dec: Eclair 2.0 porting
android-x86.org
History (2010)
●Jan: Build 20100115 (Android 2.0)●Feb: Create eclair-x86 branch (Android 2.1)●Mar: Android-x86 1.6-r2 released●Apr: Eclair-x86 updated to 2.1-update1 ●Jul: Working on froyo-x86●Aug: A test iso for vm released●Sep: target eeepc, i915 HAL, 3G support●Oct: 3D hardware acceleration●Nov: Improved vold, target viewpad10●Dec: Installer read-write support, i965 support
android-x86.org
History (2011)
●Jan: Android-x86 2.2 released●Feb: Gingerbread-x86 branch (Android 2.3)●Mar: Honeycomb-x86 porting (private)●Jul: Android-x86 2.2-r2 released●Aug: Android-x86 2.3-RC1 released●Nov: Android-x86 3.2-RC2 released●Dec: ICS-x86 branch (Android 4.0)
android-x86.org
History (2012)
●Jan: Build 20120101●Feb: Android-x86 4.0-RC1 released●Apr: Update ics-x86 to 4.0.4●Jul: Android-x86 4.0-RC2 released●Nov: Jb-x86 porting based on Android 4.2●Jul: Build 20121225 (Android 4.2)
android-x86.org
History (2013)
●Feb: Build 20130228 (Android 4.2)●Jun: Android-x86 4.0-r1 released●Jul: Build 20130725 (Android 4.3)●Nov: Kitkat-x86 porting based on Android 4.4
android-x86.org
History (2014)
●Feb: Android-x86 4.4-RC1 released●Apr: Add ntfs/exfat/ext4 support to vold●May: Android-x86 4.4-RC2 released●Aug: Android-x86 4.4-r1 released●Nov: Lollipop-x86 porting based on Android 5.0●Dec: Kernel 3.18 porting
android-x86.org
History (2015)
●Jan: Android-x86 4.4-r2 released●Mar: Lollipop-x86 updated to Android 5.1●Apr: Kernel 4.0 porting●Oct: Android-x86 5.1-rc1 released●Oct: Marshmallow-x86 porting for Android 6.0●Oct: Move git server to SourceForge
android-x86.org
Analytics: www.android-x86.org
android-x86.org
Visitors map overlay
android-x86.org
Statistics (2009/08-2012/04)
●Visits: 7,212,717●Unique Visitors: 4,447,993●Pageviews: 15,503,549●Top 5 Country/Territory
● United States● South Korea● Germany● Russia● China
android-x86.org
Features of lollipop-x86
●Android 5.1.1 (Lollipop-MR1) based●Support both 32-bit and 64-bit systems●Kernel 4.0.9, KMS enabled, support netbook/tablet native resolution●Live CD & disk installer, support ext4/ext3/ext2/ntfs/fat32●Provide hybrid iso image and EFI image●Hardware 3D acceleration (intel/radeon/nvidia chipsets)●Wifi, Bluetooth and Audio support●Auto-detect drivers●Touchscreen support, including calibration●Compressed filesystem (squashfs)●Support virtual machine like Virtual Box, Qemu and VMware●Debug mode (busybox, mksh, …)
android-x86.org
Screenshots
android-x86.org
Develop android-x86
●Get the source tree●Create a target (optional)●Customize kernel (optional)●Build an iso●Test on target device
android-x86.org
Get source
●The git server● git.androidx86.org● android-x86.git.sf.net
$ repo init -u git://gitscm.sf.net/gitroot/android-x86/manifest \ -b marshmallow-x86$ repo sync
android-x86.org
Generic target
●Device tree under■ device/generic/x86■ device/generic/x86_64■ device/generic/common
●BoardConfig.mk
android-x86.org
BoardConfig.mk
●BOARD_GPU_DRIVERS :=i915 i965 r600g swrast i915g nouveau r300g vmwgfx
●WPA_SUPPLICANT_VERSION := VER_0_8_X or VER_0_6_X
●TARGET_ARCH_VARIANT:=x86 or x86-atom
●include $(GENERIC_X86_CONFIG_MK)
android-x86.org
Build kernel
●Building rules under$(TOP)/build/core/tasks/kernel.mk
●Each target can specify its own kernel config●Kernel image and modules are built on-fly●Build kernel solely:
make kernel➔ out/target/product/$TARGET/kernel➔ out/target/product/$TARGET/system/lib/modules/
android-x86.org
Customize kernel
●$ source build/envsetup.sh●$ lunch android_x86(_64)-userdebug●$ make -C kernel O=$OUT/obj/kernel \
ARCH=x86 menuconfig●$ cp $OUT/obj/kernel/.config kernel/arch/x86/configs/●DO NOT make in kernel/ directly. If you do so, try
$ make -C kernel distclean$ rm -rf $OUT/obj/kernel
android-x86.org
Build an iso image
●$ source build/envsetup.sh●$ lunch $target-userdebug●$ make -jN iso_img
● out/target/product/$target/$target.iso{kernel,initrd.img,installer.img,ramdisk.img,system.sfs}
●Compress filesystem if mksquashfs is available(Disable it by USE_SQUASHFS=0)
android-x86.org
Test the iso image
●Hybrid iso format●Create a bootable USB
● dd if=target.iso of=/dev/sdX● Unetbootin● Linux Live USB Creator ( LiLi )
●Boot from the USB disk● Live mode● VESA mode● Debug● Installer
android-x86.org
Inside android-x86
●Bootstrap●Peripherals support
● Graphic hardware acceleration● Wifi● Touchscreen● Audio● Bluetooth● GPS● G-sensor● 3G modem● Storage
android-x86.org
Bootstrap android-x86
●Bootloader (grub) loads kernel & initrd.img●init script (bootable/newinstaller/initrd/init)
● Detect android-x86 filesystem● Unpack ramdisk.img, mount /android/system● Load scripts (/scripts, /src/scripts)● Run installer if INSTALL=1● Load modules (auto-detect)● mount /android/data, /android/sdcard● Run ts_calibrate if BOARD_USES_TSLIB=true● Set DPI● Post detect● switch_root (chroot) /android
android-x86.org
Init hook scripts
●Default scripts● 0-auto-detect ● 1-install● 2-mount● 3-tslib● 4-dpi
●Target script●Customize scripts
android-x86.org
Revise booting
●Boot parameters can be put to cmdline● ROOT● SRC● DATA, SDCARD● EXTMOD● DEBUG● UVESA_MODE● HWACCEL● BOARD_USES_TSLIB● DPI
●Put scripts in $SRC/scripts/
android-x86.org
Debug mode
●Boot by DEBUG=1●Write boot log to /tmp/log●Enter interactive shell twice
● After mount android filesystem● Before chroot
●Another two virtual consoles at Alt-F2 / F3●Run android-x86 in chroot
● Be able to access files outside android filesystem at Alt-F2 / F3 (e.g., /mnt/grub/menu.lst)
●Auto start logcat (/data/log.txt)
android-x86.org
Graphic system
●Android uses framebuffer driver, no X● vesa driver● uvesa driver● hardware driver - KMS or non-KMS
●Use soft rendering by default● Buggy for 1366x768● Very slow in 32-bit color depth
●Implements hardware rendering by Mesa library● Needs KMS driver
android-x86.org
How to change resolution?
●vesa drivervga=xxx, vga=ask
●uvesa driverUVESA_MODE=
●hardware driver, no Mesavideo=1280x800-32
●KMS + Mesasetprop debug.drm.mode 1024x768
android-x86.org
Mesa porting for HW acceletion
●Version 11.0.3●~ 60 fps●Support
● Intel integrated graphic chip● AMD radeon/radeonsi● Nvidia (nouveau)● Vmware? (vmwgfx)
●Not support● Intel Atom Zxxx, E6xx (PowerVR)
Kernel KMS driver
GPU hardware
libdrm
libGLES_mesa
drm_gralloc (HAL)
Android graphic system
android-x86.org
Wifi
●Android-x86 adds patches to auto-detect wifi driver● /sys/class/net/*/wireless
●WPA_SUPPLICANT_VERSION := ● VER_0_8_X● VER_0_6_X
●BOARD_WPA_SUPPLICANT_DRIVER :=● NL80211 (0_8)● AWEXT (0_6)
●BOARD_WPA_SUPPLICANT_PRIVATE_LIB :=● private_lib_driver_cmd (0_8)
android-x86.org
Touchscreen
●ICS needs an idc file for touchscreen● VID & PID● Device name
●Android-x86 uses a default GenericTouch.idc if no special idc found for a touchscreen.●Most touchscreens should just work if drivers are available.
android-x86.org
Touchscreen driver
●May need to load driver by EXTMOD●May need to calibrate by setting BOARD_USES_TSLIB=true●Most new multi-touch touchscreens are supported by hid-multitouch driver.
echo 3 03eb 201c 1 > \ /sys/module/hid_multitouch/drivers/hid:hid-multitouch/new_id
●Multi-touch issues can be reported to Benjamin Tissoires, who has great help to android-x86.org.
android-x86.org
Audio
●Audio HAL has been changed in ICS. WindRiver’s implementation alsa_sound doesn’t work anymore.●Use a hacked version from Linaro.●BoardConfig.mk
BOARD_USES_GENERIC_AUDIO := falseBOARD_USES_ALSA_AUDIO := trueBUILD_WITH_ALSA_UTILS := true
●Some audio chips don’t work?
android-x86.org
Bluetooth
●Android searches /sys/class/rfkill/rfkillXwhere X starts from 0
●Not always true if devices reconnect●Android-x86 modified it to search /sys/class/rfkill/ directly●Tested drivers: btusb, ath3k●Some issues are reported for ath3k
android-x86.org
GPS
●HAL hardware/gps contributed by a volunteer to support GPS input from tty
● setprop ro.kernel.android.gps ttyS3● setprop ro.kernel.android.gpsttybaud 9600
●Bluetooth GPS also works (need an app from Market)
android-x86.org
G-sensor
●HAL Kbdsensor: Support G-sensor inputs from keyboard driver: Ctrl-Alt-arrow keys
● BOARD_USES_KBDSENSOR := true● BOARD_USES_KBDSENSOR_ROTKEY1 := true (F9-F12)● BOARD_USES_KBDSENSOR_ROTKEY2 := true (F5-F8)
●HDAPS accelerometer sensor (thinkpad)● BOARD_USES_HDAPS_ACCEL := true
android-x86.org
3G modem
●Two implementations of RIL● reference-ril● huaweigeneric-ril
●setprop rild.libpath /system/lib/libhuaweigeneric-ril.so●setprop rild.libargs "-d /dev/ttyUSB2 -v /dev/ttyUSB1"●Only tested OK on Huawei modem●Internet, SMS work●Phone also works, but no sound
android-x86.org
Storage
●Support internal storage since 4.0-RC1● Use internal storage to simulate /mnt/sdcard● Share the same space as /data
●MMC/SD/USB auto-mount● A modified vold daemon● No vold.fstab needed
●Fake sdcard is considered obsolete
android-x86.org
App compatibility?
●Use arm native code (jni)● NDK r6 support x86
●Need special peripherals● Sensors, GPS, NFC
●Resolution issue● Not design for tablet
●Force portrait mode
android-x86.org
Make the app friendly for x86
●Do not use jni, or build x86 libs■ MoboPlayer for x86, Dolphin
player●Consider larger resolution●Allow landscape mode●Design tablet mode
android-x86.org
Open source activities
●www.android-x86.org● code.google.com/p/android-x86● sourceforge.net/projects/android-x86
●Over 2,800,000 downloads● Over 320,000 downloads for ics-x86
●twitter.com/android_x86●IRC at irc.freenode.net #android-x86
android-x86.org
Discussion group
●groups.google.com/group/android-x86●[email protected]●Over 3600 subscribers●~ 1000 emails/month
android-x86.org
Cowork with upstream AOSP
●Submit patches to review.source.android.com●19 patches are accepted and merged (2010):●9779, 10065, 10066, 11443, 11444, 13251,13272, 13467, 13468, 14078, 14117, 15209, 15599, 15664, 15702, 15975, 16034, 16979, 16980●Patches review in progress●16035, 16162, 16163, 16318, 17233, 17234, 17273
android-x86.org
Open source partners
●0xdroid - 0xlab●CyanogenMod●MirOS (mksh)●OESF●Open Invention Network (OIN)●LIME
android-x86.org
What we contributed?
●Modified build system to customize kernel●Open source OpenGL ES implementation●New style Android installer●MMC/SD/USB auto-mount●Configurable keyboard layouts●Soft mouse cursor (obsolete)●Ethernet support (deprecated)
android-x86.org
Soft mouse cursor & Ethernet
●Handle mouse events and draw cursor on Canvas●Support wheel for scrolling, right button●Obsolete since honeycomb
●Ethernet status tracker (like Wifi status tracker)●Monitor the Ethernet status●Configurable via Settings●Considered deprecated●Simulate by libril-ethernet?
android-x86.org
Challenges
●Too many platforms, peripherals●auto-detect, target specified scripts
●Android is originally designed for ARM●Some are optimized for ARM only●Some apps only provide ARM version
●Optimization for x86●Art, bionic, llvm, v8, ...●Hardware acceleration (2D/3D, codec, ...)
●Power management
android-x86.org
Vendors
●Google●No interesting before, but may
changed since ICS●Difficulty: don't use AOSP tree
●Intel●At first no interesting, no help●Begin their own porting recently●Criticize?
android-x86.org
Call for developers
●Google group: Android-x86http://groups.google.com/group/android-x86
●IRC channel at irc.freenode.net
#android-x86
●Issue trackerhttp://code.google.com/p/android-x86/issues/list
Related Documents
