[REF] How to boot your SD build from magldr [quick guide] - HD2 Android SD Development

This is a very short guide for all of you looking to dual boot android from the sd card now that you have windows phone 7 taking up the nand space. It's originally posted by letama and I added a bit to it.
It's actually quite simple. All you have to do is add nand_init to one line in the init.rc file. For most builds, you will need to use a linux distro and mount the rootfs.img file, then edit the init rc file, add nand_init to this line:
Code:
service ril-daemon /system/bin/rild -l /system/lib/libhtc_ril_wrapper.so -- -d /dev/smd0
so it looks like this
Code:
service ril-daemon /system/bin/rild -l /system/lib/libhtc_ril_wrapper.so -- -d /dev/smd0 nand_init
For builds that uses the cedesmith initrd method, you have to mount the system.ext2 file, everything else is the same.
Save your file. Make sure you haven't changed the permissions and unmount the image. Copy the build to your microsd, set magldr to boot from the directory you copied it to and boot ad sd, you should be good to go.
Problems: booting it this way does not read from your startup.txt, you have to wait for cotulla to add it in future magldr. I'm not sure if the old method of updating (dumping everything in a folder named root) still works.
Disclaimer: I've tried this with jdms, hd2one, superram, desire_hd2 and mdj rEVOlution 2.3 and they all work fine with my old data image, your mileage may vary. This is a very quick guide because that's all I know Anymore I'll have to search google, so you might as well do that yourself Anyone who have a better method of editing feel free to post it. I'll add it here if you post it in this thread.
Tip from aled99 to edit without linux.
Corias said:
I've managed to mount system.ext2 to Windows 7. Without VM and Linux at all.
What tools are needed:
1. Windows Ext2/Ext3 driver. You can get it from here.
2. Any software to mount image to virtual drive. I've used Gizmo Drive, but there are others also working.
Tip: Gizmo doesn't show ext2 as supportable image type, when you browse for image. So, manually type *.* filter.
Click to expand...
Click to collapse
Some files that are already edited:
CoreDroid HD 0.4 edited by ricola7
Desire_hd2 system.ext2 file
HD2ONE 0.3.5 system.ext2
JDMS 1.62
MDJ HD v4.6
MDJ rEVOlution 2.3 rootfs.img
NexusHD2-FRG83D v1.8 from nzxtneo
Superram 1.5 from letama
Builds that already work with magldr:
DL DesireZ v2.2 from dandiest
HD2 Gingerbread/CyanogenMod7 from copenhagen

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Is this a method to boot a NAND Rom from SD Card without flashing?

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blax123 said:
Is this a method to boot a NAND Rom from SD Card without flashing?
Click to expand...
Click to collapse
No it boots the sd builds from this subforum. Not the nand builds.

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will this work if I have android in my nand, and want to run a different android off of sd card? Like if I wanna test drive gingerbread roms off the sd, while sticking with a froyo based rom in nand? I really want to do this.

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izzy spun said:
will this work if I have android in my nand, and want to run a different android off of sd card? Like if I wanna test drive gingerbread roms off the sd, while sticking with a froyo based rom in nand? I really want to do this.
Click to expand...
Click to collapse
I haven't tried copenhagen's build but it should work the same way. Try it and let us know how it worked out
Edit: Actually I got curious and checked it out. Copenhagen's build does not require editing. You can boot it from sd using magldr as it is. Nice too. I think I'll play with that for a while

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Sorry but I'm stuck on the first line. What is a linux distro? How do I edit the line? I'll be able to take care of the rest. This is the part that confuses me.

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buzz killington said:
This is a very short guide for all of you looking to dual boot android from the sd card now that you have windows phone 7 taking up the nand space. It's originally posted by letama and I added a bit to it.
It's actually quite simple. All you have to do is add nand_init to one line in the init.rc file. For most builds, you will need to use a linux distro and mount the rootfs.img file, then edit the init rc file, add nand_init to this line:
Code:
service ril-daemon /system/bin/rild -l /system/lib/libhtc_ril_wrapper.so -- -d /dev/smd0
so it looks like this
Code:
service ril-daemon /system/bin/rild -l /system/lib/libhtc_ril_wrapper.so -- -d /dev/smd0 nand_init
For builds that uses the cedesmith initrd method, you have to mount the system.ext2 file, everything else is the same.
Save your file. Make sure you haven't changed the permissions and unmount the image. Copy the build to your microsd, set magldr to boot from the directory you copied it to and boot ad sd, you should be good to go.
Problems: booting it this way does not read from your startup.txt, you have to wait for cotulla to add it in future magldr. I'm not sure if the old method of updating (dumping everything in a folder named root) still works.
Disclaimer: I've tried this with jdms, hd2one, superram, desire_hd2 and mdj rEVOlution 2.3 and they all work fine with my old data image, your mileage may vary. This is a very quick guide because that's all I know Anymore I'll have to search google, so you might as well do that yourself Anyone who have a better method of editing feel free to post it. I'll add it here if you post it in this thread.
Click to expand...
Click to collapse
thanks.. so i must use linux? any tools available in win?

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buzz killington said:
I haven't tried copenhagen's build but it should work the same way. Try it and let us know how it worked out
Edit: Actually I got curious and checked it out. Copenhagen's build does not require editing. You can boot it from sd using magldr as it is. Nice too. I think I'll play with that for a while
Click to expand...
Click to collapse
can you elaborate on this please.
can you give a step by step.
i am real interested in trying this.
thanks in advance.

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Anthonayy said:
Sorry but I'm stuck on the first line. What is a linux distro? How do I edit the line? I'll be able to take care of the rest. This is the part that confuses me.
Click to expand...
Click to collapse
It's just short for Linux distribution, such as ubuntu or redhat. I used ubuntu. Once you have it mounted you can use any text editor available.
vista1984 said:
thanks.. so i must use linux? any tools available in win?
Click to expand...
Click to collapse
Sorry, I don't know if there are. Maybe others can chime in. Anything that'll let you mount an ext2 image and edit its contents will do. Unfortunately I'm not familiar with any windows tools.

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Will this hack enable me to run Android from my SD card, with WP7 installed on the phone?
I just want to make sure, because I've been searching around, and several indidual sources have said that WP7 doesn't recognize any SD cards, including compatible SD cards.
I would really love to try WP7, but without losing my android.
Sent from my HTC HD2 using XDA App

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WOOZ!E said:
Will this hack enable me to run Android from my SD card, with WP7 installed on the phone?
I just want to make sure, because I've been searching around, and several indidual sources have said that WP7 doesn't recognize any SD cards, including compatible SD cards.
I would really love to try WP7, but without losing my android.
Sent from my HTC HD2 using XDA App
Click to expand...
Click to collapse
Dude, it has nothing to do with WP7, You boot Android from MAGLDR not WP7. So you would either use a different SD card to boot into Android BEFORE booting windows or you would partition your SD card in a way that it allows you to use it for WP7 and Android at same time.

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How can I mount the system.ext2 by using terminal?
Code:
[email protected]# mount -o loop system.ext2 /mnt
system.ext2: No such file or directory

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asdfg2010 said:
How can I mount the system.ext2 by using terminal?
Code:
[email protected]# mount -o loop system.ext2 /mnt
system.ext2: No such file or directory
Click to expand...
Click to collapse
you have to specify where your file is and I believe you have to create a mount point, you can't just put it in /mnt. Somebody correct me if I'm wrong
Code:
cd /mnt
sudo mkdir sys
sudo mount -o loop -t ext2 /home/usr/Desktop/system.ext2 /mnt/sys

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buzz killington said:
you have to specify where your file is and I believe you have to create a mount point, you can't just put it in /mnt. Somebody correct me if I'm wrong
Code:
cd /mnt
sudo mkdir sys
sudo mount -o loop -t ext2 /home/usr/Desktop/system.ext2 /mnt/sys
Click to expand...
Click to collapse
I try but not successful

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windows ext2 editing
buzz killington said:
It's just short for Linux distribution, such as ubuntu or redhat. I used ubuntu. Once you have it mounted you can use any text editor available.
Sorry, I don't know if there are. Maybe others can chime in. Anything that'll let you mount an ext2 image and edit its contents will do. Unfortunately I'm not familiar with any windows tools.
Click to expand...
Click to collapse
I think you can edit an ext2 image with windows using the method in post #4 from this thread: http://forum.xda-developers.com/showthread.php?t=808169
Corias said:
I've managed to mount system.ext2 to Windows 7. Without VM and Linux at all.
What tools are needed:
1. Windows Ext2/Ext3 driver. You can get it from here.
2. Any software to mount image to virtual drive. I've used Gizmo Drive, but there are others also working.
Tip: Gizmo doesn't show ext2 as supportable image type, when you browse for image. So, manually type *.* filter.
Click to expand...
Click to collapse
I've tried editing the file and it seemed to save the changes, but I haven't tried booting android yet.

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I am trying to do this method in super ram Rom but no success. I have successfully mount system.ext2 but there wasn't any init.rc file. After a lot Google search I have managed to discover that this file is in file initrd.gz and I made the change. But the build starts and hangs in first screen.any suggestion;
Sent from my HTC HD2 using Tapatalk

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can anyone uploade the files? i dont have linux..

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Cool, thanks! I seems to be working for me with MDJ FroYo HD v4.6. Has anyone had any success getting two Android ROMs running from their microSD card? I was doing this when booting from WM6.5 by putting them in different directories and modifying rel_path in the startup.txt for one of them, but obviously this method won't work until MAGLDR supports startup.txt...

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clio94 said:
I am trying to do this method in super ram Rom but no success. I have successfully mount system.ext2 but there wasn't any init.rc file. After a lot Google search I have managed to discover that this file is in file initrd.gz and I made the change. But the build starts and hangs in first screen.any suggestion;
Sent from my HTC HD2 using Tapatalk
Click to expand...
Click to collapse
I didn't do the superram built myself, but letama posted a full version later in that magldr thread. Try to see if you can find it. If not I'm sure I still have it somewhere I can post it for you.

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You can change Android folder on SD using MAGLDR
Enter Magldr
Select 9. Services
then 1. BootSettings
then 3. AD SD Dir