[Q] Multi-Booting

[m11kkaa]

I released a dual boot version that uses 2nd-boot a few months back, hadn't have much time to improve it since.
I was using loop-back mount with /system and bind mount with /data since it's much more space efficient than just use an ext3 image.

The problem is that I have to modify the rom itself todo that.
I replaced the nodes in the dev-tree so the rom can do whatever she want(except remounting /dev) and it will alwas access the file-images instead of the real partitions.

Sure we could dynamically loop over the init-scripts and replace every mount but this method wouldn't be that compatible.


@epsilon: Thank you for integrating this into bootmenu. Makes much things easir
In which way you want to do that? An real effort would be an menu where you can choose between multiple installations.

 

[m11kkaa]

The update-zip's are not able to remount /system.
I analysed this problem a little bit and it seems that this command doesn't work after lazy unmount of /system:

# mount system /system
mount: mounting system on /system failed: Invalid argument

but this is still working:

mount /dev/block/mmcblk1p21 /system

Is there any deeper difference which I don't see?

Edit: Seems the partition-name "system" is already linking to the original partition which cannot be mounted because she's busy.
Editing /proc/partitions didn't do the trick.

 

[balika01]

I uploaded a new version of my multiboot-script(v0.2)
changelog:
- "Install zip from SDcard" works now
- changed hook-method so it works with more ROM's(including ICS)

Download:
http://www.multiupload.com/UT0TLPR3ZW

THX! Good work! I will work on 3 partitions sdcard (ext3(system)-ext3(data)-fat) from your script.

EDIT: i forget the CACHE partition so 4 partitions

 

[m11kkaa]

I didn't understand completely what you want to say but great that you like my work

MIUI-Installer-zip's currently cannot be installed because they have a problem remounting the partitions as I mentioned above.

 

[balika01]

your job better than my.
Congratulations!

 

[m11kkaa]

Just created a new version: v0.3.1

Download:
http://www.multiupload.com/27LU9STUS6

Changelog:
- moving original system-partition to another location instead of lazy unmount so she will be accessible in 2ndBoot-system and will not be busy
- fixed recovery to improve installer-zip compatibility. MIUI works now
- internal script-changes

Have fun

PS: I currently noticed, that the system will continue running if you unmount the sdcard
Edit: Changed the version-number and some other details. No need to re-download since it will change nothing in functionality

 

[szacuken]

So i must put folder fsimages on sdcard, instal defy_multiboot_v0.3.zip via CWM and reboot system. Then put for example: ICS.zip on sdcard and instal it via "lastet recovery" from boot menu? Then reboot phone to bootmenu again and select "2ndboot" option for boot ICS from sdcard right?

While selecting the "stable recovery" I can manage the default installed system?

 

[m11kkaa]

Yes, that's right

Edit: Yes, "Stable Recovery" is still for your real system.
I hope, the bootmenu-integration will be ready soon so this would be more clear.

 

[szacuken]

Ok. You`re great This mod is very useful especially when we want to test a rom for a while. Thanks you

 

[m11kkaa]

I've created a new thread for my mod:
http://forum.xda-developers.com/showthread.php?p=19737327