Android keylayout

system/usr/keylayout/qwerty.kl

#keycode FUNC ???
59(F1) MENU

Modify Android Pixelflinger to support ATMEL BGR555

I try to trace the libpixelflinger source code. However, it seems to be a troublesom work.

----
/system/core/libpixelflinger/scanline.cpp
/system/core/include/libpixelflinger/format.h
/system/core/libpixelflinger/format.cpp
/system/core/libpixelflinger/buferr.cpp
/system/core/libpixelflinger/codeflinger/texturing.cpp

/bootable/recovery/minui/graphics.c

/frameworks/base/libs/surfaceflinger/BlurFilter.cpp
/frameworks/base/libs/surfaceflinger/LayoutBase.cpp
/frameworks/base/libs/surfaceflinger/LayerBlur.cpp
/frameworks/base/libs/surfaceflinger/Layer.cpp

/frameworks/base/opengl/include/GLES/gl.h
/frameworks/base/opengl/include/GLES2/gl2.h
/frameworks/base/opengl/libagl/mipmap.cpp
/frameworks/base/opengl/libagl/egl.cpp
/frameworks/base/opengl/libagl/texture.cpp

Android Touchscreen Driver for AT91SAM9261-EK

The modified touchscreen driver drivers/input/touchscreen/ads7846.c

Reference
https://gforge.ti.com/gf/project/omapandroid/tracker/?action=TrackerItemEdit&tracker_item_id=240

Android Battery Driver

1. Create driver/power/fack_battery.c
2. Modify the driver/power/Makefile
power_supply-objs := power_supply_core.o
power_supply-objs += fack_battery.o

[NOTE] Muse Enable Linux Kernel Power Management

Reference
[1] Rockie Cheng's Blog

Android root file system

1. Download and Compile unyaffs
gcc -o unyaffs unyaffs.c

2. ramdisk.img
mkdir android_rootfs
cd android_rootfs
cp ~/android-sdk-linux_86/platforms/android-2.1/images/ramdisk.img ramdisk.img.gz
gzip -d ramdisk.img.gz
cpio -i -F ramdisk.img

3. system.img and userdata.img
cd system
~/unyaffs/unyaffs ~/android-sdk-linux_86/platforms/android-2.1/images/system.img
cd ../data
~/unyaffs/unyaffs ~/android-sdk-linux_86/platforms/android-2.1/images/userdata.img
cd ..

4. device
sudo mknod dev/console c 5 1
sudo mknod dev/null c 1 3
sudo mknod dev/tty2 c 4 2
sudo mknod dev/tty3 c 4 3
sudo mknod dev/tty4 c 4 4
sudo mknod dev/fb0 c 29 0

5. Board Dependent
sed 's/goldfish/AT91SAM9261-EK/g' init.goldfish.rc > init.AT91SAM9261-EK.rc
mv system/etc/init.goldfish.sh system/etc/init.AT91SAM9261-EK.sh

6. Modify init.rc for NFS Boot by commenting out mount commands
mount rootfs rootfs / ro remount
mount yaffs2 mtd@system /system
mount yaffs2 mtd@system /system ro remount
mount yaffs2 mtd@userdata /data nosuid nodev
mount yaffs2 mtd@cache /cache nosuid nodev

cp init.rc init.rc.bak
sed -e 's/mount rootfs/#mount rootfs/g' init.rc.bak > init.rc.tmp
sed -e 's/mount yaffs2/#mount yaffs2/g' init.rc.tmp > init.rc


References
[1] Android on OMAP, http://elinux.org/Android_on_OMAP
[2] Unyaff, http://code.google.com/p/unyaffs/

Android Frame Buffer Driver for AT91SAM9261

1. Android frame buffer need support double-buffering. The default AT91SAM9261 Linux config use internal SRAM as frame buffer. However, the internal SRAM capacity is only 160KB, which is insufficient to support 320x240x16-bit double-buffering. You need to disable the option by:
make ARCH=arm menuconfig
Device Driver --->
Graphic Support --->
Support for frame buffer devices --->
AT91/AT32 LCD Controller support
[ ] Frame Buffer in internal SRAM

2. Modify the Frame buffer driver (drivers/video/atmel_lcdfb.c), here is the modified atmel_lcdfb.c
2.1 Allocate double buffer:
ret = fb_find_mode(&info->var, info, NULL, info->monspecs.modedb,
info->monspecs.modedb_len, info->monspecs.modedb,
sinfo->default_bpp);
info->var.yres_virtual = info->var.yres*2;

2.2 Modify atmel_lcdfb_set_par
please refer to the reference [3]

2.3 Transform RGB565 to BGR555 (A stupid method)
* Allocate SRAM Frame Buffer for LCD Controller
* Cover FrameBuffer(Android View) to SRAM FrameBuffer(LCDC View)

Reference
[1] Android Platform Development Kit
[2] Linux Frame Buffer Driver
[3] Patch Framebuffer Driver of PrimeCell Color LCD Controller with Double-Buffering to Support Android’s Page-Flipping

Android need JDK5

1.in /etc/apt/sources.list append:
deb http://run.hit.edu.cn/ubuntu/ jaunty main restricted universe multiverse
deb-src http://run.hit.edu.cn/ubuntu/ jaunty main restricted universe multiverse
deb http://run.hit.edu.cn/ubuntu/ jaunty-updates main restricted universe multiverse
deb-src http://run.hit.edu.cn/ubuntu/ jaunty-updates main restricted universe multiverse
deb http://run.hit.edu.cn/ubuntu/ jaunty-backports main restricted universe multiverse
deb-src http://run.hit.edu.cn/ubuntu/ jaunty-backports main restricted universe multiverse
deb http://run.hit.edu.cn/ubuntu/ jaunty-security main restricted universe multiverse
deb-src http://run.hit.edu.cn/ubuntu/ jaunty-security main restricted universe multiverse

2. sudo apt-get udpate

3. sudo apt-get install sun-java5-jdk

Install Android SDK on Ubuntu 9.10

1. Install Eclipse
sudo apt-get install eclipse

2. Install Eclipse ADT
Follow the instructions, you may have this problem.

3. Adding Android SDK Component
Follow the instructions, you may need you click the options:
Settings > Misc > "Force https://... sources to be fetched using http://"

4. I had tried to port SDK 1.5, 1.6, 2.1, All of them works.

Build Android Linux Kernel for AT91SAM9261-EK

1. Get the Source and Prebuilt Toolchain
mkdir android_project
cd android_project
git clone git://android.git.kernel.org/kernel/common.git
git clone git://android.git.kernel.org/platform/prebuilt.git
cd common

2. Apply Linux 2.6.27 Patches for AT91
zcat 2.6.27-at91.patch.gz | patch -p1

3. Configure Linux using default 2.6.27 configuration at91sam9261ek_defconfig
cp at91sam9261ek_defconfig .config

4. Android-dependent Configuration
CONFIG_ASHMEM=y
CONFIG_ARM_THUMB=y

5. Build Linux Kernel
make ARCH=arm oldconfig
make ARCH=arm CROSS_COMPILE=/home/zhong/android_project/prebuilt/linux-x86/toolchain/arm-eabi-4.4.0/bin/arm-eabi-

6. Create U-Boot Image
sudo apt-get install uboot-mkimage
mkimage -A arm -O linux -T kernel -C none -a 0x22200000 -e 0x22200040 -n 'android-linux' -d arch/arm/boot/zImage uImage

7. U-Boot command
setenv bootcmd 'tftp 0x22200000 uImage; bootm 0x22200000'


* 0x22200000 is the DRAM address where the Image is loaded to.

References
[1] Andriod Opensource Project
[2] Linux4SAM
[3] AT91 Linux 2.6 Patches
[4] lianxijian's Blog

Linux NFS root file system

1. Install
sudo apt-get install nfs-common nfs-kernel-server
(if you can not find the package, please update /etc/apt/sources.list)

2. Setup
sudo vi /etc/exports
/nfsroot *(rw,async,no_root_squash)
[NOTE] no space after *

3. Restart NFS Server
sudo /etc/init.d/nfs-kernel-server start

4. Using Uboot set Linux Kernel argument
setenv bootargs 'root=dev/nfs nfsroot=192.168.1.100:/nfsroot'
setenv nfsserver 192.168.1.100
setenv netmask 255.255.255.0
saveenv

Reference
Checko' Blog

Busybox-1.15.3

1. Install Required Package
sudo apt-get install libncurses5-dev

2. Busy Configuration
make menuconfig
2.1.
Busybox Settings --->
Build Options --->
Cross Compiler prefix (/cross/usr/bin/arm-linux-)
2.2.
BusyBox Settings --->
Build Options --->
Build BusyBox as a static binary (no shared libs)

3. Make and Install
make ARCH=arm
make install
This will generate a directory "_install"

4. Create console and null Device
cd _install
mkdir dev
cd dev
sudo mknod console c 5 1
sudo mknod null c 1 3
sudo mknod tty2 c 4 2
sudo mknod tty3 c 4 3
sudo mknod tty4 c 4 4

5. /etc/init.d/rcS
mkdir etc
mkdir etc/init.d
vi etc/init.d/rcS
chmod +x etc/init.d/rcS