Develop Bugs

[Q] How to mount EMMC as SDCARD?

I am using aosp roms, so there is no way to save my pictures and videos i take to emmc.
I searched some methods on google.
Now i realized i have to fix vold.fstab file in system/etc
but i have no idea on the codes like this.
Is it possible to mount emmc as sdcard, and mount sdcard as emmc or something else such as sdcard2 or something.
one of them i found was talking about how to bypass apps that require an sd card with no sdcard.
but i wanna use both of them, internal and sdcard together.

lentm said:
I am using aosp roms, so there is no way to save my pictures and videos i take to emmc.
I searched some methods on google.
Now i realized i have to fix vold.fstab file in system/etc
but i have no idea on the codes like this.
Is it possible to mount emmc as sdcard, and mount sdcard as emmc or something else such as sdcard2 or something.
one of them i found was talking about how to bypass apps that require an sd card with no sdcard.
but i wanna use both of them, internal and sdcard together.
Click to expand...
Click to collapse
IF emmc is supported, you can (maybe?) make it work by running the following in a terminal (on the phone). Worked for me in CM 6.0, never tried in Gingerbread. (# is prompt)
*Unmount SD card via menu 1st*
#cd /sdcard
#ls
*Nothing should show up*
If nothing shows up the SD has been unmounted properly
Remove it now if possible
#cd /mnt/emmc
#ls
IF emmc files show up, continue.
If not, your rom doesn’t support emmc, and there is really not much you can do
#mnt /mnt/emmc /mnt/sdcard

I think they want to use both the SD card and EMMC together, like in a Sense rom, not replace the SD with EMMC.
AFAIK, you can't *save* pictures and things to EMMC on AOSP roms, but I'm pretty sure they can still read any media from it. So you'd just have to put anything you wanted on the internal storage from your computer. I'm pretty sure that's how CM6 was set up, anyway.
I never really use my internal storage, though, so I could be way off.

godsmacked4653 said:
I think they want to use both the SD card and EMMC together, like in a Sense rom, not replace the SD with EMMC.
AFAIK, you can't *save* pictures and things to EMMC on AOSP roms, but I'm pretty sure they can still read any media from it. So you'd just have to put anything you wanted on the internal storage from your computer. I'm pretty sure that's how CM6 was set up, anyway.
I never really use my internal storage, though, so I could be way off.
Click to expand...
Click to collapse
Depends on the rom. Most AOSP ones now support eMMC scanning, but some still do not. Also, you might not be able to save pictures without using my solution, but you can use any other file manager / save window to navigate to /mnt/emmc and change/save things.

lentm said:
Now i realized i have to fix vold.fstab file in system/etc
Is it possible to mount emmc as sdcard, and mount sdcard as emmc or something else such as sdcard2 or something.
Click to expand...
Click to collapse
Absolutely. The "easy" way to do it is to modify /system/etc/vold.fstab. Below is the default vold.fstab file from CM7...
Code:
## Vold 2.0 fstab for HTC Incredible
#
## - Koushik Dutta
##
#######################
## Regular device mount
##
## Format: dev_mount <label> <mount_point> <part> <sysfs_path1...>
## label - Label for the volume
## mount_point - Where the volume will be mounted
## part - Partition # (1 based), or 'auto' for first usable partition.
## <sysfs_path> - List of sysfs paths to source devices
######################
# Mounts the first usable partition of the specified device
dev_mount sdcard /mnt/sdcard auto /devices/platform/goldfish_mmc.0 /devices/platform/msm_sdcc.2/mmc_host/mmc1
dev_mount emmc /mnt/emmc 3 /devices/platform/msm_sdcc.3/mmc_host/mmc2
What you want to do is modify the last two lines and swap the sysfs paths, so it looks like the following:
Code:
dev_mount sdcard /mnt/sdcard [b]3 /devices/platform/msm_sdcc.3/mmc_host/mmc2[/b]
dev_mount emmc /mnt/emmc [b]auto /devices/platform/goldfish_mmc.0 /devices/platform/msm_sdcc.2/mmc_host/mmc1[/b]
(Edit: I forgot to include the partition # in the bits of data that need moved. Doh!)
After putting the modified file in place and rebooting, the internal flash (normally known as emmc) will be mounted and labeled as /mnt/sdcard. Everything that uses the sdcard for storage will now be reading and writing to emmc. Likewise, the sdcard will be mounted to /mnt/emmc, so it's still available and readily visible.
The important thing here is to make sure that you have good backups of the content of both storage spaces, and that you remember which is which. It's crucial when you update your ROM, since it will overwrite the vold.fstab file back to default.
Also, before you do this, make sure that you migrate any apps you have stored on SD back to internal storage, or else you'll have to reinstall them afterwards.

ardax said:
Absolutely. The "easy" way to do it is to modify /system/etc/vold.fstab. Below is the default vold.fstab file from CM7...
Code:
## Vold 2.0 fstab for HTC Incredible
#
## - Koushik Dutta
##
#######################
## Regular device mount
##
## Format: dev_mount <label> <mount_point> <part> <sysfs_path1...>
## label - Label for the volume
## mount_point - Where the volume will be mounted
## part - Partition # (1 based), or 'auto' for first usable partition.
## <sysfs_path> - List of sysfs paths to source devices
######################
# Mounts the first usable partition of the specified device
dev_mount sdcard /mnt/sdcard auto /devices/platform/goldfish_mmc.0 /devices/platform/msm_sdcc.2/mmc_host/mmc1
dev_mount emmc /mnt/emmc 3 /devices/platform/msm_sdcc.3/mmc_host/mmc2
What you want to do is modify the last two lines and swap the sysfs paths, so it looks like the following:
Code:
dev_mount sdcard /mnt/sdcard [b]3 /devices/platform/msm_sdcc.3/mmc_host/mmc2[/b]
dev_mount emmc /mnt/emmc [b]auto /devices/platform/goldfish_mmc.0 /devices/platform/msm_sdcc.2/mmc_host/mmc1[/b]
(Edit: I forgot to include the partition # in the bits of data that need moved. Doh!)
After putting the modified file in place and rebooting, the internal flash (normally known as emmc) will be mounted and labeled as /mnt/sdcard. Everything that uses the sdcard for storage will now be reading and writing to emmc. Likewise, the sdcard will be mounted to /mnt/emmc, so it's still available and readily visible.
The important thing here is to make sure that you have good backups of the content of both storage spaces, and that you remember which is which. It's crucial when you update your ROM, since it will overwrite the vold.fstab file back to default.
Also, before you do this, make sure that you migrate any apps you have stored on SD back to internal storage, or else you'll have to reinstall them afterwards.
Click to expand...
Click to collapse
I was looking for this. will try now. Thank you!
edit: just tried this, it didn't work. had to replace to original one.

run the following in a terminal or via ADB: mount | grep emmc to figure out what block its named as then run switch to the root account using su then type umount /emmc to unmount the emmc partition. Figure out what sdcards device name is by doing mount | grep sdcard. Unmount it and mount sdcard's device name to /emmc and vice versa.
This wont persist after a reboot but its a good way to try and get it to work without screwing stuff up. Once you get it to work put the values in fstab.

Any suggestions?
Hello all,
Hopefully someone more apt than myself can provide some insight. I am running Synergy 3D version on my DINC. I am trying to either make the eMMc an addition SD card mount point, in order to store apps, etc or partition it to use as vram in some way.
I successfully changed the eMMc into SD card by modding the vold.fstab (per post here), the problem is, DINC will not recognize SD as eMMc.
Any suggestions will be greatly appreciated.
Also, would it even be conceivably possible to partition eMMc as vram?

Darn shame not to be able to use both the emmc and sdcard at the same time. You could do it by converting the sdcard to ext2/3/4 but then when you plug into a non linux box you'll need a ext2/3/4 driver.
Is there a filesystem that is widely readable for both linux and windows?
I guess it might not be a problem if the internal sdcard is ext3 because you could still have the emmc as fat.
Thoughts?
Oh crap... I just tried changing the emmc mount point in fstab to /mnt/sdcard/external_sd and no I've got no boot, presumable because android won't accept a mount point over something that is already mounted (linux can).... I need to find a way to recover...
Would somebody be so kind as to cat /system/etc/vold.fstab here for me? I backed it up... but to the internal sdcard!
Hang on... I can't paste that into vi... vi is bonkers for some reason, not recognising the a key...
I also have nowhere for a non su adb to push the file... or any other files... (permission denied)
and I can't get the CWM recovery mode for some reason....
"Also, would it even be conceivably possible to partition eMMc as vram?"
^ yes it's possible. I'm not that familiar with android yet but I'm sure it's possible

try Remount sd app =) it worked for me well =) dont forget thanks button =D
http://forum.xda-developers.com/show...1#post30146401

Do a nandroid just in case, and then flash this thru recovery. http://dinc.does-it.net/Mods/AOSP_Swap_EMMC_and_SD.zip
And here is a flashable to revert the swap. http://dinc.does-it.net/Mods/AOSP_Original_vold.fstab.zip

please help me (
it didnot work

Swap ext SD to internal SD

Since we are so limited in memory 5gb left for apps and its data. Is there a way to swap these 2. I'm a gamer and love the size but I would like to be able download my game data apps to ext sd and have the games look in there when they open. I was thinking just renaming them would work but it's not allowable and maybe more to it than that. I've seen some modify the VOLD file in /system/etc to accomplish this on froyo or gingerbread. I'm thinking thats the solution or perhaps a kernel mod?
This is the script inside the vold file
## Vold 2.0 fstab
#######################
## Regular device mount
##
## Format: dev_mount <label> <mount_point> <part> <sysfs_path1...>
## label - Label for the volume
## mount_point - Where the volume will be mounted
## part - Partition # (1 based), or 'auto' for first usable partition.
## <sysfs_path> - List of sysfs paths to source devices
######################
dev_mount external_sdcard /mnt/external_sd auto /devices/platform/sdhci-tegra.2/mmc_host/mmc1
dev_mount external_usb_disk /mnt/usb_storage auto /devices/platform/tegra-ehci.2/usb1
Here is what I found for SGS
http://www.darkyrom.com/community/i...l-internal-sd-gingerbread-version.5457/page-2

There's an app called GLtoSD which will move the larger data files from games to the external SD card. Seems to work well and is simple to set up.

ED2O9 said:
There's an app called GLtoSD which will move the larger data files from games to the external SD card. Seems to work well and is simple to set up.
Click to expand...
Click to collapse
Thank you. Going to try it now.
EDIT: Thank you this works for me

You could use a adb to symlink the internal memory to the external if you wish.
For those who don't know, symlink means a "shortcut" to another location in Linux.
As an example, if you try to go to /mnt/sdcard/music, you could make a symlink to /external_sd/music, then whenever some app try to access the music folder in the internal memory, it would take them to the one in the external SD. The same could be done with the whole internal partition, leaving all of the internal memory for apps, and all the extra content would be sent to the external SD, saving you space. As I only have a single SD that I use with with my evo shift, I haven't tried this, but it should work in theory. I know we had to do some symlinking to root the shift awhile back, so it can't be too difficult. I can't remember how to make them at the moment, but if that sounds like something you would want to do, just reply to this.

linuxman008 said:
You could use a adb to symlink the internal memory to the external if you wish.
For those who don't know, symlink means a "shortcut" to another location in Linux.
As an example, if you try to go to /mnt/sdcard/music, you could make a symlink to /external_sd/music, then whenever some app try to access the music folder in the internal memory, it would take them to the one in the external SD. The same could be done with the whole internal partition, leaving all of the internal memory for apps, and all the extra content would be sent to the external SD, saving you space. As I only have a single SD that I use with with my evo shift, I haven't tried this, but it should work in theory. I know we had to do some symlinking to root the shift awhile back, so it can't be too difficult. I can't remember how to make them at the moment, but if that sounds like something you would want to do, just reply to this.
Click to expand...
Click to collapse
I'm game, where would you suggest I find the "symlink" method for any device, I can apply the difference in device myself.
ummmmm............ could you repeat that?

thanks ED2O9
i couldn't find the GLtoSD app in the market, is there a link for that please?

aboodyksa said:
thanks ED2O9
i couldn't find the GLtoSD app in the market, is there a link for that please?
Click to expand...
Click to collapse
Try searching for GL to SD. not GLtoSD

this just in.....
http://forum.xda-developers.com/showpost.php?p=20884096&postcount=26

linuxman008 said:
You could use a adb to symlink the internal memory to the external if you wish.
For those who don't know, symlink means a "shortcut" to another location in Linux.
As an example, if you try to go to /mnt/sdcard/music, you could make a symlink to /external_sd/music, then whenever some app try to access the music folder in the internal memory, it would take them to the one in the external SD. The same could be done with the whole internal partition, leaving all of the internal memory for apps, and all the extra content would be sent to the external SD, saving you space. As I only have a single SD that I use with with my evo shift, I haven't tried this, but it should work in theory. I know we had to do some symlinking to root the shift awhile back, so it can't be too difficult. I can't remember how to make them at the moment, but if that sounds like something you would want to do, just reply to this.
Click to expand...
Click to collapse
hi can u guide me how to create a symlink, for example i wanted to create one
to repoint /sdcard/Android to /sdcard/external_sd/Android
also one that repoints /sdcard/NaviSEA to /sdcard/external_sd/SD/NaviSEA
I've rooted my phone (samsung galaxy w gt i 8150)
however when i run terminal editor with "su" rights
doing the following command resulted in "Operation not permitted"
ln -s /sdcard/external_sd/NaviSEA /sdcard/NaviSEA
how should I do it instead?

You cant symlink folders, its not possible since your microsd card is formatted in fat32.

[HOWTO] mount EMMC and External SD on CM7 as it is on Stock ROMs

Hello Everyone.
In this post, I would like to show how to mount Internal SD card and External SD card when using Cyanogenmod 7 ROM.
I had some issues because CM7 mounts the internal SD card under /mnt/emmc and mounts external SD card under /mnt/sdcard.
As you know, there are many applications that download data using /mnt/sdcard as path and if you have CM7 way of mounting these apps won't work.
So to mount Internal SD card to /mnt/sdcard and External SD card to /mnt/sdcard/external_sd as it is done on Stock ROMs proceed with the following:
1 - Open the file /etc/vold.fstab with your preferred text editor (I use root Explorer) and find and modify the last lines as below an then save:
# internal sdcard
dev_mount emmc /mnt/sdcard 28 /devices/platform/msm_sdcc.1/mmc_host/mmc0/mmc0
# external sdcard
dev_mount sdcard /mnt/sdcard/external_sd auto /devices/platform/msm_sdcc.3/mmc_host/mmc2/mmc2
# otg sdcard
usb_mount sdcard2 /mnt/sdcard/usbStorage auto /devices/platform/msm_hsusb_host.0
#end line
2 - Open the file /system/build.prop with your preferred text editor and find and modify the following lines as it is show an then save:
# notify vold we have internal and external sd
ro.additionalmounts=/mnt/sdcard/external_sd
ro.vold.switchablepair=/mnt/sdcard/external_sd,/mnt/sdcard
3 - Reboot the phone and voilá
This procedure worked for me and I have no issues to mount both my Internal and External SD cards when plugging the phone on my laptop.

a good guide indeed for the CM7 ROM users
I did something similar for all my Gameloft games, EA games, Glu games, and DATA partition, and Download, and all the other stuff, basically i mounted everything off to my 64 GB SD card instead of internal SD
lets give this topic some flight time, stuck for a month, it'll come off by itself
also added to main INDEX

Thanks AllGamer...

thanks, i was looking for something like this for a while.

Thanks so much for this. Thanks a bunch!!!

ICS
Can someone who had flashed ICS Alpha builds tell us if this procedure works on them?
Thanks and I am glad I'd helped someone by doing this post

Testing this out right now on Isotope, let's all keep our fingers crossed.

talmeida said:
Hello Everyone.
In this post, I would like to show how to mount Internal SD card and External SD card when using Cyanogenmod 7 ROM.
I had some issues because CM7 mounts the internal SD card under /mnt/emmc and mounts external SD card under /mnt/sdcard.
As you know, there are many applications that download data using /mnt/sdcard as path and if you have CM7 way of mounting these apps won't work.
So to mount Internal SD card to /mnt/sdcard and External SD card to /mnt/sdcard/external_sd as it is done on Stock ROMs proceed with the following:
1 - Open the file /etc/vold.fstab with your preferred text editor (I use root Explorer) and find and modify the last lines as below an then save:
# internal sdcard
dev_mount emmc /mnt/sdcard 28 /devices/platform/msm_sdcc.1/mmc_host/mmc0/mmc0
# external sdcard
dev_mount sdcard /mnt/sdcard/external_sd auto /devices/platform/msm_sdcc.3/mmc_host/mmc2/mmc2
# otg sdcard
usb_mount sdcard2 /mnt/sdcard/usbStorage auto /devices/platform/msm_hsusb_host.0
#end line
2 - Open the file /system/build.prop with your preferred text editor and find and modify the following lines as it is show an then save:
# notify vold we have internal and external sd
ro.additionalmounts=/mnt/sdcard/external_sd
ro.vold.switchablepair=/mnt/sdcard/external_sd,/mnt/sdcard
3 - Reboot the phone and voilá
This procedure worked for me and I have no issues to mount both my Internal and External SD cards when plugging the phone on my laptop.
Click to expand...
Click to collapse
does it work for other devices cm7 roms??

tried it and didn't work for me. Might have typed it wrong. Will try again.
I only used the file browser to see if i can access both the emmc and the sd card but could only get to the emmc

I will try...

talmeida said:
Hello Everyone.
In this post, I would like to show how to mount Internal SD card and External SD card when using Cyanogenmod 7 ROM.
I had some issues because CM7 mounts the internal SD card under /mnt/emmc and mounts external SD card under /mnt/sdcard.
As you know, there are many applications that download data using /mnt/sdcard as path and if you have CM7 way of mounting these apps won't work.
So to mount Internal SD card to /mnt/sdcard and External SD card to /mnt/sdcard/external_sd as it is done on Stock ROMs proceed with the following:
1 - Open the file /etc/vold.fstab with your preferred text editor (I use root Explorer) and find and modify the last lines as below an then save:
# internal sdcard
dev_mount emmc /mnt/sdcard 28 /devices/platform/msm_sdcc.1/mmc_host/mmc0/mmc0
# external sdcard
dev_mount sdcard /mnt/sdcard/external_sd auto /devices/platform/msm_sdcc.3/mmc_host/mmc2/mmc2
# otg sdcard
usb_mount sdcard2 /mnt/sdcard/usbStorage auto /devices/platform/msm_hsusb_host.0
#end line
2 - Open the file /system/build.prop with your preferred text editor and find and modify the following lines as it is show an then save:
# notify vold we have internal and external sd
ro.additionalmounts=/mnt/sdcard/external_sd
ro.vold.switchablepair=/mnt/sdcard/external_sd,/mnt/sdcard
3 - Reboot the phone and voilá
This procedure worked for me and I have no issues to mount both my Internal and External SD cards when plugging the phone on my laptop.
Click to expand...
Click to collapse
Oh man, thank you!
This worked like a charm on my Epic Touch 4G.

tried this in a aokp rom(hydrogen), and it doesn't work.

Why not mount the emmc to /mnt/sdcard/external_sd in addition to /mnt/eemc for backward compatibility?

Does it work on CM9 too?

I had ICS Passion v13 installed on my Samsung Vibrant before, and my vold.fstab file is a bit different from cm7's. I now have cm7 installed but the vold.fstab file doesn't seem to have changed with the change of roms.
It would be great if you could post the fstab and build.prop files somewhere online from where I can download it and replace in my phone because I don't want to mess up again(I encountered the "encryption failed" bug in ICS today and I tore my hair out fixing that..so yeah.)
Thank you.

Anyone else that's on AOKP have any luck getting this to work??? The flip-flooped SD cards on CM9/AOKP is seriously annoying..
Sent from my AOKP'd T989

This is the vold.fstab file in my Samsung Vibrant:
## Vold 2.0 Generic fstab
## - San Mehat ([email protected])
##
#######################
## Regular device mount
##
## Format: dev_mount <label> <mount_point> <part> <sysfs_path1...>
## label - Label for the volume
## mount_point - Where the volume will be mounted
## part - Partition # (1 based), or 'auto' for first usable partition.
## <sysfs_path> - List of sysfs paths to source devices
######################
# internal sdcard
dev_mount emmc /mnt/emmc 1 /devices/platform/s3c-sdhci.0/mmc_host/mmc0
# external sdcard
dev_mount sdcard /mnt/sdcard auto /devices/platform/s3c-sdhci.2/mmc_host/mmc2
As you can see, it is differs from the one you posted in the guide. What steps should I take now?

Can anyone show me how to do this with captivate cm7?
Please and thanks!

fresherthanU said:
Anyone else that's on AOKP have any luck getting this to work??? The flip-flooped SD cards on CM9/AOKP is seriously annoying..
Sent from my AOKP'd T989
Click to expand...
Click to collapse
has anyone found a solution for AOKP yet? I find that many of my apps such as google music and my camera don't save files properly. This has caused me to switch back to juggernaut.
major thanks to anyone who can help!

[A] CM10 Reverse mounting Internal SD with External, Saving camera pics to SD

I'm not responsible if you do harm to your phone, I'm sure if you mess up you can just reflash cm10 through CWM and be fine though.
backup file /etc/vold.fstab
edit file /etc/vold.fstab (i used ES File Explorer)
towards the end of the file you will see
Original (FYI these mount points are specific to T989)
# internal sdcard
dev_mount sdcard /storage/(some long path)
# external sdcard
dev_mount external_sd /storage/(some long path)
swap the mount points for these 2 dev_mount
Example
# internal sdcard
dev_mount external_sd /storage/(some long path)
# external sdcard
dev_mount sdcard /storage/(some long path)
Save and reboot
Click thanks if this helped

Swap internal SD and ext_sd

Hello,
I have some trouble with a P6 firmware B111
The Phone have 8Go + micro SD of 32Go
/sdcard
/storage/sdcard0
/mnt/sdcard
are shortcut to the "internal SD"
/storage/emulated/0
And
/storage/sdcard0
/mnt/sdcard2
are shortcut to th external SD (of 32go)
/mnt/ext_sdcard
I want use offline GPS tomtom but all maps take 7go.
i can easily put on my exernal SD
But the app install it on the /sdcard
so not enought memory.
Any trick to mount /sdcard to my exernal sd?
I have already change my /system/etc/vold.fstab:
Code:
dev_mount sdcard /mnt/ext_sdcard auto /devices/platform/hi_mci.0/mmc_host/mmc1
but doesn't work even after reboot
Same with the app root external 2 internal SD of codlab.

In official china rom for p6 version B116 has an option already to chose external sd card as primary storage..you can try that rom and copy vold.fstab
Sent from my HUAWEI P6-U06 using Tapatalk 2

Especially for Tomtom this trick helps to me:
Root you device.
Install Tomtom and download map to internal storage first
Install FolderMount from Play
In FolderMount, create pair between /sdcard/tomtom and ext_sdcard/tomtom
This will move map to external SD card and create link from internal storage.

What a great a simple 'out of the box' thought. It works perfect for me!!!

You can use this script, just copy to /system/etc/init.d.
Script:
"mount -t vfat -o umask=0000 /dev/block/vold/179:33 /storage/sdcard0
mount -o bind /data/media /storage/sdcard1"