I didn't have time to play around with the proprietary blobs yet, but what I have tried so far on the go:

Completely reflashed Ubuntu Touch ontop of working CM 10.1 install WITHOUT WIPE -> No issues
Reflashed CM 10.1 and booted into it -> No issues, no files or settings gone
Reflashed Ubuntu Touch (quantal-preinstalled-armel+maguro.zip) -> No issues, no files or settings gone

So it is not a "real" dual-boot but it gets the job done.
That will continue to work as long as Canonical doesn't require us to completely wipe our devices.

Oh, and if we want to make Ubuntu Touch run flawlessly we should start contributing to the upstream project
instead of doing our own custom ROMs and not contributing back. That way everybody benefits.

Re: [DEV] Dual Booting Project [Android - Ubuntu Phone OS] (HELP NEEDED)

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Originally Posted by beidl

I didn't have time to play around with the proprietary blobs yet, but what I have tried so far on the go:

Completely reflashed Ubuntu Touch ontop of working CM 10.1 install WITHOUT WIPE -> No issues
Reflashed CM 10.1 and booted into it -> No issues, no files or settings gone
Reflashed Ubuntu Touch (quantal-preinstalled-armel+maguro.zip) -> No issues, no files or settings gone

So it is not a "real" dual-boot but it gets the job done.
That will continue to work as long as Canonical doesn't require us to completely wipe our devices.

Oh, and if we want to make Ubuntu Touch run flawlessly we should start contributing to the upstream project
instead of doing our own custom ROMs and not contributing back. That way everybody benefits.

Great work beidl, I will post a guide in General giving you all credits.

Thank you

Enviado desde mi Galaxy Nexus usando Tapatalk 2

Originally Posted by beidl

Reporting semi-success
So i diffed the system directories of CM 10.1 and Ubuntu Touch and found the new files.


I pushed those files to my working CM 10.1 installation on the GNex.
Since I did not wipe my GNex when I went back from Ubuntu Touch to CM 10.1, the folder structure
of Ubuntu stayed at /data/ubuntu/.

Then, I rebooted into the bootloader and flashed the boot.img of Ubuntu Touch to the GNex.
After rebooting, the device was stuck at the Google boot logo but the kernel did actually boot, so I was able to adb shell into the device.
dmesg returned:

<6>[   15.739807] PVR_K:(Error): BridgedDispatchKM: Initialisation failed.  Driver unusable. [4783, /home/ubuntu/jenkins/workspace/phablet-image/kernel/samsung/tuna/drivers/gpu/pvr/bridged_pvr_bridge.c]

That means Canonical still uses the kernel from before a week, this kernel doesn't play nicely with the new proprietary GPU driver.
I'll try pushing the old GPU blobs now...

There is a source of ubuntu kernel?

I am not from around here, but isn't it possible to just bind /system to system.img in any directory, and then boot it from there after the same has been done for /data and /cache?

Re: [DEV] Dual Booting Project [Android - Ubuntu Phone OS] (HELP NEEDED)

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Originally Posted by sgt. meow

I am not from around here, but isn't it possible to just bind /system to system.img in any directory, and then boot it from there after the same has been done for /data and /cache?

It would be counter productive because you would need to uncompress the images to gain access to the partitions.

Sent from my Galaxy Nexus using Tapatalk 2

Check out our u-boot port. It can be loaded instead of the linux kernel and chainloaded from the Samsung's SBL bootloader
https://github.com/Ksys-labs/uboot-tuna

You can edit the [include/configs/omap4_tuna] and comment the CONFIG_SPL_BUILD line and flash the u-boot.bin instead of the kernel.
Then, you can put the android boot.img to /system/boot/vmlinux.img
You can put the custom image in the u-boot mkimage or the android image format to /sdcard/boot/vmlinux.uimg and the boot script to /sdcard/boot/boot.scr.uimg, and you can boot that image by holding the volume down button.


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And if you really wonder about the CONFIG_SPL_BUILD. Just stop reading here.


Yes, you can enable it and replace the Samsung's SBL with u-boot. Be careful. It only works with old xloader's (PRIMEKK14 and older). Display does not work, so you'll have to rebuild the kernel and disable omap framebuffer bootloader init check. If you brick the device, use "OMAPFlash_tuna.zip" to recover.

AW: [DEV] Dual Booting Project [Android - Ubuntu Phone OS] (HELP NEEDED)

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Awesome, didn't know somebody ported u-boot over to the GNex.
I'll take a look at it today, play around with it and maybe improve my C skills a bit.
(I can read C code pretty easily but I have not written anything in C in years).
Now multibooting has some real potential!

Sent from my Galaxy Nexus using xda premium

Originally Posted by sp3dev

Check out our u-boot port. It can be loaded instead of the linux kernel and chainloaded from the Samsung's SBL bootloader
https://github.com/Ksys-labs/uboot-tuna

You can edit the [include/configs/omap4_tuna] and comment the CONFIG_SPL_BUILD line and flash the u-boot.bin instead of the kernel.
Then, you can put the android boot.img to /system/boot/vmlinux.img
You can put the custom image in the u-boot mkimage or the android image format to /sdcard/boot/vmlinux.uimg and the boot script to /sdcard/boot/boot.scr.uimg, and you can boot that image by holding the volume down button.


----
And if you really wonder about the CONFIG_SPL_BUILD. Just stop reading here.


Yes, you can enable it and replace the Samsung's SBL with u-boot. Be careful. It only works with old xloader's (PRIMEKK14 and older). Display does not work, so you'll have to rebuild the kernel and disable omap framebuffer bootloader init check. If you brick the device, use "OMAPFlash_tuna.zip" to recover.

interesting...i think it's the best way with uboot.definately follow this 3ad from now on..

I think you're all going about this wrong.. kexec is definitely the way to go. Prepare your /system with both the android and ubuntu files. Then install a modified recovery.img to where you would install the normal boot.img. The recovery image would be modified with a menu to launch two commands, run ubuntu and run android. When run ubuntu is selected, kexec runs the ubuntu kernel, and vice versa. You wouldn't need to patch the android or ubuntu kernel only the recovery kernel.

Re: [DEV] Dual Booting Project [Android - Ubuntu Phone OS] (HELP NEEDED)

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anyone looked at Hashcode's Safestrap? His custom recovery allows up to 5 ROMs to be installed on the same device.

Sent from my Galaxy Nexus using xda premium