[DEV|WIP] Dualboot Kernel [GSM|CDMA-WIP] - Xperia Play Android Development

Credits:
DooMLoRD - BootManager and recoveries, autorooting and his scripts
Jerpelea (FXP) - zImage (kernel), boot splash logo
z - busybox knowledge, and his loop mount script.
GSM Only atm, CDMA not done yet, WIP.
Download:
Dualboot Kernel GSM: http://icxperia.com/keiran/r800i/dualboot.img
Data EXT2 image (~250MB), http://icxperia.com/keiran/r800i/data.ext2
How to dualboot:
What you will need:
An SD Card
ADB
Fastboot
7zip or alternative(Archive manager on linux is good)
Notepad++(gedit is good)
First, flash the dualboot.img
Code:
fastboot flash boot dualboot.img
How to partition SD Card for dual boot:
Code:
adb shell
sdparted -es 1024M -ss 0
When prompted to accept, make sure you use a capital Y
This operation will wipe your sd card :O lol
when it is done, type:
Code:
exit
in the command prompt/terminal
Now, put the data.ext2 image in the same folder as adb is
Second of all, you want to mount your second SD Card partition, using your computer with USB debugging enabled do this:
Code:
adb shell
busybox mount /dev/block/mmcblk0p2 /sd-ext
exit
then push the data partition image:
Code:
adb push data.ext2 /sd-ext/data.ext2
Now you have your system partition and data image set up for dualboot, you are also running a dualboot kernel
next thing to do is modify a ROM for boot from SD
We shall use CM7 in this example
Unzip the ROM, and go to /META-INF/com/google/android/ then open updater-script in notepad++, it will not work otherwise
Look for the lines:
Remove these lines:
Code:
assert(getprop("ro.product.device") == "R800i" || getprop("ro.build.product") == "R800i" || getprop("ro.product.board") == "R800i" ||
getprop("ro.product.device") == "R800a" || getprop("ro.build.product") == "R800a" || getprop("ro.product.board") == "R800a" ||
getprop("ro.product.device") == "R800at" || getprop("ro.build.product") == "R800at" || getprop("ro.product.board") == "R800at" ||
getprop("ro.product.device") == "zeus" || getprop("ro.build.product") == "zeus" || getprop("ro.product.board") == "zeus");
also, remove:
Code:
format("yaffs2", "MTD", "system");
also, replace:
Code:
mount("yaffs2", "MTD", "system", "/system");
with
Code:
set_perm(0, 0, 0777, "/sbin/systemsd.sh");
run_program("/sbin/systemsd.sh");
then save, then zip, then push to phone
Then, flash the update.zip (after doing a NANDROID) then boot phone into NAND.
To boot into SD ROM, do this:
Open terminal emulator and do the commands:
Code:
su
cd cache
cd recovery
touch dualboot
reboot
And you will reboot into SD ROM
You will not be able to use darktremor a2sd or any other a2sd script with any of the ROM's, but, you will be able to use standard stock rom app2sd, in CyanogenMod go into CM settings, then application then set install location to internal to avoid conflicts with .android_secure on both ROM's
Kernel source:
https://github.com/freexperia/semc-kernel-msm7x30
Keiran

---

Whoa....
Just done a quadrant from the rom of the SD - CM7, I got amazing IO speeds, probably because my SD card reads faster than NAND....
But, no overclock, Max,1GHz, min 144MHz, interactive:
{
"lightbox_close": "Close",
"lightbox_next": "Next",
"lightbox_previous": "Previous",
"lightbox_error": "The requested content cannot be loaded. Please try again later.",
"lightbox_start_slideshow": "Start slideshow",
"lightbox_stop_slideshow": "Stop slideshow",
"lightbox_full_screen": "Full screen",
"lightbox_thumbnails": "Thumbnails",
"lightbox_download": "Download",
"lightbox_share": "Share",
"lightbox_zoom": "Zoom",
"lightbox_new_window": "New window",
"lightbox_toggle_sidebar": "Toggle sidebar"
}
Look at the green IO bit... lol looks like SD can boost performance
Sent from my R800i

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can't wait to test it.
Wouldn't it be better to use a ICS ramdisk (or make serval kernels) so you can flash ICS and GB??
GB works also with ics ramdisk (i guess)

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No, ICS requires a different ramdisk, so you would only be able to boot two of the sameish android versions, although doomlord said somethin about chrooting...
Sent from my R800i using DFR3.0.5 NAND + CM7 SELFKANG SD

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I want some cm fun nice work
Sent from my R800i using xda premium

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Next on my list of development is a linux tool, ftf2rom, what it will so is unpack an ftf and convert it into a flashable zip with the kernel there also, and then there will be ramdisk editor and such...
Keiran
Sent from my R800i using DFR3.0.5 NAND + CM7 SELFKANG SD

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So us normal being's have a long wait lol
Sent from my R800i using xda premium

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hitman980206 said:
So us normal being's have a long wait lol
Sent from my R800i using xda premium
Click to expand...
Click to collapse
Not really, just DFMiX might not see many new releases for a while. DFR will, and so will this kernel
Sent from my R800i using DFR3.0.5 NAND + CM7 SELFKANG SD

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KeiranFTW said:
Not really, just DFMiX might not see many new releases for a while. DFR will, and so will this kernel
Sent from my R800i using DFR3.0.5 NAND + CM7 SELFKANG SD
Click to expand...
Click to collapse
Well I'm using dfr3 and its been great if I could have some cm7 fun when not needing touchpads would extra bonus
Sent from my R800i using xda premium

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KeiranFTW said:
With the Xperia Play, comes an awesome gamepad, and it works as it should... on the stock rom.
So, people wanted to use CM, but they wanted touchpads, so they just kept stock. Not any more
What I have basically done (basic is not the word to use):
Made a script that is executed on boot that does the following if a certain file is present:
Unmounts NAND system and data partitions.
Mounts NAND partitions to /mnt/system and /mnt/data
Mounts sd-ext mmcblk0p2 to /system
Loops the /system/data.ext2 to loop3 - remember system is now mmcblk0p2
Mounts loop3 as /data
Then removes the temp file used for telling the phone to boot into recovery
So, you need an ext partition on sd that will hold /system files and /data IMG containing files.
I will show you how to adapt a Rom to dualboot when I upload the kernel.
Credits go to Jerpelea for zImage and DooMLoRD for base ramdisk.
Will upload 21st, Tuesday, currently polishing and studying lol.
CDMA to follow tomorrow too
Oh, it works
Keiran
Sent from my R800i using DFR3.0.5 NAND + CM7 SELFKANG SD
Click to expand...
Click to collapse
Alright, I got to give it up to you on this one. This was a crazy idea and you pulled it off. Much respect for this Kerian.

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KeiranFTW said:
Not really, just DFMiX might not see many new releases for a while. DFR will, and so will this kernel
Sent from my R800i using DFR3.0.5 NAND + CM7 SELFKANG SD
Click to expand...
Click to collapse
so can I dual boot stock and MIUI with this kernel ? or only CM7 at this moment ?

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You couldn't boot stock and MIUI as they require a diffrent kernel.
Sent from my R800i

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is it possible to instead booting into cm to boot into debian or something like that?

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So, if i would want to use this dual booting, i wouldn't be able to use a2sd?

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KeiranFTW said:
Not really, just DFMiX might not see many new releases for a while. DFR will, and so will this kernel
Sent from my R800i using DFR3.0.5 NAND + CM7 SELFKANG SD
Click to expand...
Click to collapse
Yes! More DFR (and hopefully more frequent DFMix updates as well... ehehe..) updates! Thanks a lot man. With the touchpads working the same as the stock firmware it'll be a perfect rom. Well, almost since everything can't be perfect

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Need little bit help for understanding...
With this kernel it is possiblem to boot for example the STOCK .42 Firmware from NAND and CM7 or any other rom from the SD Card?
If so it is perfect, because i love stock but i like cm7 so i can switch between the two roms without wipes and kernel flashing?

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evo_racer said:
Need little bit help for understanding...
With this kernel it is possiblem to boot for example the STOCK .42 Firmware from NAND and CM7 or any other rom from the SD Card?
If so it is perfect, because i love stock but i like cm7 so i can switch between the two roms without wipes and kernel flashing?
Click to expand...
Click to collapse
The way i understand it is as long as it uses the same kernel/ramdisk it will work so stock .42 and CM7 should be fine but ICS wouldnt work
Sent from my R800i using xda premium

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thereverend86 said:
The way i understand it is as long as it uses the same kernel/ramdisk it will work so stock .42 and CM7 should be fine but ICS wouldnt work
Sent from my R800i using xda premium
Click to expand...
Click to collapse
Correct,
You could get A2SD to work with third ext partition, mmcblk0p3, but it would be pointless unless for stock ROM...
Releasing kernel and dualboot compatible CM in about 2+ hours need to work on it, found a problem with it
Sent from my R800i using DFR3.0.5 NAND + CM7 SELFKANG SD

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Nice work.. can you write a how to for me? Im happy with my play at the moment.. stock with many many games on it so i will not wipe my data

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Excellent news
You could get MIUI to work with dual booting CM7 + MIUI. Basically, 3G PreLinked CM7 dual booted with MIUI and a 3G PReLinked Kernel
@everyone Let him at least finish it, then once it is uploaded begin to ask questions. Remember this is a development section!