Friday, January 11, 2008

Extract google android file system image

To run google android on the truely hardware, you may need the google android file system image.

Google android file system consists of two parts: system and data.
You can find the google android file system image on benno's website: Android filesystem images

You can also extract the google android file system by yourself from the android emulator by the following way:
1. download the google android sdk and extract onto your platform
2. start up the google android emulator
3. upload a busybox tool to the google android emulator, you can find a busybox binary on benno's website: busybox for android, you can also find the cross-compiler (select ARM GNU/Linux, and IA32 GNU/Linux) and create a busybox tool by yourself.
4. to upload files to the google android emulator, run the following command:
# adb push filename /target_folder/filename
the target_folder is the folder on the file system of google android emulator. e.g. /system/bin/
put the busybox to /system/bin, so you can see busybox tool in the extracted file system.
5. open a google android shell command window:
# adb shell
6. change the busybox mode to 555:
# chmod 555 /system/bin/busybox
7. create the tarball for /system and /data:
# busybox tar cvf /system.tar /system
# busybox tar cvf /data.tar /data
8. pull the tarball file from the google android emulator:
# adb pull system.tar /system.tar
# adb pull data.tar /data.tar

a note: when you want run google android on your truely hardware, the data.tar is not a must.


rams said...

Hi Buddy,

Got the images (system.tar, data.tar & ramdisk) from Benno's site. Can you please show me some pointers for putting these images into the NEO Freerunner.


rtm said...

Have you booted up your device with android available linux kernel? Does the console available? If yes, you have several choices to boot up into android idle:
1. boot from microsd card, I see your device has microsd. If you have your microsd enabled in your linux kernel, you can boot from microsd. first, format your microsd card with your PC, extract system.img to microsd/system folder, create microsd/data folder. second, change your ramdisk. rename the init to startup. compose another init with some shell scripts to mount the microsd, symbol link to microsd/system, microsd/data, and exec the startup. last, change your bootargs to point to microsd so to start up from your microsd. bootargs setup is in your u-boot console.
2. bootup from flash if you have your flash ready. first you need to make sure the flash works. second you need to decide the partition you are going to use for system and data. third you need to flash the system.img to your corresponding partitions. make sure which file system you are using. you need to re-create the system.img if you are using different file system (jffs2/yaffs2). last change ramdisk the init scripts and the bootargs so to startup from the flash
3. NFS startup if your device has network available. Not sure because mostly only debug board has network access.

rams said...


Thanks for the detailed steps.
One doubt though, Does MicroSD
booting supported by the Kernel
released by Sean for the Neo


rtm said...

You need to find out.
You can plug in the microsd, and try mount it in your console. Normally the microsd device might be sdb1, sdc1, sdd1, etc.
sudo mount -t ext3 /dev/sda1 /media/disk

bard said...

Hi sir:
when i try to extract the file system from emulator. I found that the android file system is read only, I can not push my busybox to the android file system. how can i deal with it?

rtm said...

1. push your busybox to /data partition
2. if you insist on /system partition, you can remount your /system partition to rw, instead of ro as default. the command is:
# mount -o remount,rw -t yaffs2 /dev/block/mtdblock0 /system

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androjes said...

I need more details about boot from flash and NFS please!
I have only 64Mo of flash, there is 2 free partitions (5M for data.img and 55M for system.img) the kernel is ready in other partition. And what about ramdisk?

I have one idea, I was extract ramdisk and fill /system and /data of rootfs.
After that, I create a jffs2 image from the rootfs(size=32M). And I will put it in my NAND (partition which have 55M of size).

my bootargs: root=/dev/mtdblock3 console=ttySAC0,115200 rootfstype=jffs2

When I copy the root in memory it's interrupted. I search one methode to copy it directly in the NAND! if someone can help me?

I'm sorry about my english! Thanks

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mohammad biniyas said...

Hi ,

Can you please tell how can i Create system.img and data.img or Jffs2 file system ?

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