android 1.5 on gumstix overo

kernel source可從 embinux.org 取得，其中也包含android 1.5的source code，並且有做一些patch

ex: battery, and keyboard layout

Download and Compile Source

$ mkdir your_android_dir

$ cd your_android_dir

$ repo init -u git://labs.embinux.org/repo/android/platform/beaglemanifest.git/

$ repo sync

$ make

ps: 關於repo，參考http://source.android.com/download的Installing Repo

Compile kernel

$ cd your_android_dir/kernel

$ export CC_PATH=/home/vanix/CodeSourcery/Sourcery_G++_Lite/bin/arm-none-linux-gnueabi-

$ make menuconfig

由於板子的關係，額外勾選gumstix overo and USB host

$ vi ../vendor/embinux/support-tools/beagle_build_kernel.sh

comment the codes about make config and make clean

$ ../vendor/embinux/support-tools/beagle_build_kernel.sh

此時只會build，不會刪除剛設定好的.config

Install Android Root Filesystem into SD Card

$ cd your_android_dir/out/target/product/generic

$ cp -a root/* /media/disk/

$ cp -a system/* /media/disk/system/

$ cd /media/disk/

$ chown -R root.root *

$ chmod -R 777 data/ system/

ps: 要注意init.rc的mount ro xxx此行是否有註解掉

Boot arguments

$ setenv mmcargs setenv bootargs console=ttyS2,115200n8 root=/dev/mmcblk0p2 rootdelay=2 omapfb.mode=dvi:800x480MR-16@60 init=/init

$ setenv mmcargs setenv bootargs console=ttyS2,115200n8 androidboot.console=ttyS2 root=/dev/mmcblk0p2 rootdelay=2 omapfb.mode=dvi:800x480MR-16@60 init=/init

dss參數的寫法時常有變動，可參考kernel內的Documentation/arm/OMAP/DSS

Other Setting

參考之前另一篇android on gumstix overo

Other Problems

1. 800x480 on OLED panel - 1. dss參數下正確即可 2. kernel要support GPIO and 開機時立即執行gpio shell
2. Battery - 開機後立即halt，android porting discussion有好幾種解法，其中之一的解法：更改的com_android_server_BatteryService.cpp
3. touch功能 - 板子並無外接touch panel，導致一些apps無法正常運作，android porting 相關discussion，修改frameworks/base/libs/utils/ResourceTypes.cpp
4. 取出android SDK 1.5的file system - 參考Extract google android file system image
5. 用android SDK 1.5 fs裡的system/，取代我們編譯好的system/，但是會遭遇上述2跟3的問題，將自己編好的libandroid_servers.so和libutils.so取代原本的檔案即可解決

Alsa Setting

這個部份查到的資料比較繁瑣，另外獨立出來整理

Kernel的部份

$ make menuconfig

Device driver -> sound driver -> alsa -> 將相關的選項都打勾

$ make

$ cp arch/arm/boot/uImage /media/FAT

Android source的部份

$ cd your_android_dir/external 


$ git clone git://android.git.kernel.org/platform/external/alsa-lib.git

$ git clone git://android.git.kernel.org/platform/external/alsa-utils.git

$ 
cd your_android_dir/hardware

$ git clone git://android.git.kernel.org/platform/hardware/alsa_sound.git 


$ vi your_android_dir/build/target/board/generic/BoardConfig.mk 
BOARD_USES_ALSA_AUDIO := true 


BUILD_WITH_ALSA_UTILS=true 


# BOARD_USES_GENERIC_AUDIO := true

$ vi your_android_dir/system/core/init/devices.c

{ "/dev/snd/", 0664, AID_SYSTEM, AID_AUDIO, 1 },

(事後發現這行似乎沒有作用, 還是得自行mkdir /dev/snd, 可參考init.rc)

$ cd your_android_dir

$ make

$ vi your_android_dir/out/target/product/generic/root/init.rc

# set the alsa audio driver

mkdir /dev/snd

symlink /dev/pcmC0D0c /dev/snd/pcmC0D0c

symlink /dev/pcmC0D0p /dev/snd/pcmC0D0p

symlink /dev/controlC0 /dev/snd/controlC0

symlink /dev/timer /dev/snd/timer

chmod 0777 /dev/snd/pcmC0D0c

chmod 0777 /dev/snd/pcmC0D0p

chmod 0777 /dev/snd/controlC0

chmod 0777 /dev/snd/timer

chown root audio /dev/snd/controlC0

chown root audio /dev/snd/pcmC0D0c

chown root audio /dev/snd/pcmC0D0p

chown root audio /dev/snd/timer

setprop alsa.mixer.playback.master Front

setprop alsa.mixer.capture.master Capture

setprop alsa.mixer.playback.earpiece Master

setprop alsa.mixer.capture.earpiece Capture

setprop alsa.mixer.playback.headset Master

setprop alsa.mixer.playback.speaker

$ vi your_android_dir/system/etc/asound.conf

sample: asound.conf for TWL4030 on OMAP

(reference this discussion from android porting)