Step by step porting

Following previous post, this is step by step porting notes.

1. Log in from minicom
2. mount /dev/mmcblkop1 -> i use SDCARD to put android data and system.
3. i get android android image from : http://androidzaurus.up.seesaa.net/image/android-sdboot-image.tar.gz
4. mount it -> mount -o loop android.img androidroot/
5. make symbolic link to data and system

           ln -s /android/androidroot/system /system
           ln -s /android/androidroot/data /data

1. export android environment variables

                export PATH=/sbin:/system/sbin:/system/bin:$PATH
                export LD_LIBRARY_PATH=/system/lib
                export ANDROID_ROOT=/system
                export ANDROID_ASSETS=/system/app
                export ANDROID_DATA=/data
                export EXTERNAL_STORAGE=/sdcard
                export DRM_CONTENT=/data/drm/content

1. These steps :

/bin/chmod -R a+rw /data /tmp
/bin/rm -r /dev/log
cd /dev
/bin/ln -s /var/tmp/log log
/bin/rm -f log/*
/bin/touch log/main
/bin/touch log/events
/bin/touch log/radio
cd /

/bin/chmod -R a+rw /dev/binder

1. i forgot these :

copy all android etc file
cp /android/androidroot/etc/* /etc -R

1. disable autostart in in /etc/init.rc for dbus-daemon, app_process and runtime.

zygote {
exec /system/bin/app_process
args {
0 -Xzygote
1 /system/bin
2 –zygote
}
autostart 0
}
runtime {
exec /system/bin/runtime
autostart 0

}

1. chroot to androidroot

chroot ./androidroot
run init ./init

1. see android home screen on LCD

this is tricky method as i never get android home screen. First running OS is OSELAS with 2.6.19.2 kernel version. The most important thing is about to port binder driver to the kernel so that android runs properly. While binder come with android kernel source which is 2.6.23 version, this is gonna be little bit effort to port binder to lower kernel version. I get patches from Brilliant Service who successfully port android to 2.6.18 kernel (Armadillo). You can get it here Brilliant Service

First i apply all patch and there were too much error related to binder driver and kmem_cache_create. I guess there will be no problem if i don’t apply mxcfb.c patch (some developers said that there must be double buffering) because i get it in mxcfb.c (originally shipped with it’s kernel)

/* Default Y virtual size is 2x panel size */
fbi->var.yres_virtual = fbi->var.yres * 2;
So, i only need to build binder , lowmemorykiller, and android driver. I got compiled kernel and flash uImage to the SBC. Another change in config file is only CONFIG_BINDER=y, CONFIG_ANDROID_RAM_CONSOLE=y and CONFIG_LOW_MEMORYKILLER=y. I added them after make pcm037_defconfig.

Anyway, i did not test more into network and another function. The touchscreen still not working.