External Sd card support in Kitkat 4.4.2

[Anand R]

Hi All,

I am facing a issue when i try to mount a external sdcard in a custom device which is running on Kitkat 4.4.2.

Below is the error which i am getting whenever sdcard mount happens.

03-11 23:25:32.229: E/cutils(553): Failed to mkdir(/mnt/shell/emulated/0): Read-only file system

03-11 23:25:32.229: E/dalvikvm(553): cannot mountExternalStorage(): Read-only file system

My init.device.rc is as follows:

# no emmc file systems mounted at this point (system, data, pds, etc.)

# runs after "on early-init" and before "on early-fs"

# runs in charge-only-mode

on init

    export PATH /system/sbin:/system/bin:/system/xbin:/sbin:/vendor/bin

    write /sys/class/graphics/fbcon/cursor_blink 0

    mkdir /mnt/shell 0777 shell shell

    mkdir /mnt/shell/emulated 0700 shell shell

    #mkdir /storage 0550 system sdcard_r

    mkdir /storage/emulated 0555 root root

    mkdir /mnt/media_rw 0777 media_rw media_rw

    mkdir /mnt/media_rw/sdcard1 0700 media_rw media_rw

    mkdir /storage/sdcard1 0775 root root

    export EXTERNAL_STORAGE /storage/emulated/legacy

    export SECONDARY_STORAGE /storage/sdcard1

    export EMULATED_STORAGE_SOURCE /mnt/shell/emulated

    export EMULATED_STORAGE_TARGET /storage/emulated

    #symlink /storage/emulated/legacy /sdcard

    #symlink /storage/emulated/legacy /mnt/sdcard

    #symlink /storage/emulated/legacy /storage/sdcard0

    #symlink /mnt/shell/emulated/0 /storage/emulated/legacy

    #symlink /storage/sdcard1 /extSdCard

    #symlink /storage/sdcard1 /mnt/extSdCard

fstab.device is as follows

# Android fstab file.

#<src> <mnt_point> <type> <mnt_flags and options> <fs_mgr_flags>

# The filesystem that contains the filesystem checker binary (typically /system) cannot

# specify MF_CHECK, and must come before any filesystems that do specify MF_CHECK

/dev/block/system /system ext4 ro,noatime wait

/dev/block/cache /cache ext4 nosuid,nodev,noatime,nodelalloc,barrier=1,data=ordered wait,check

#/dev/block/panic /panic raw defaults wait

/dev/block/userdata /data ext4 nosuid,nodev,noatime,nodelalloc,barrier=1,data=ordered wait,check,encryptable=footer

/dev/block/pds /pds ext4 nosuid,nodev,noatime,nodelalloc,barrier=1,data=ordered wait,check

/devices/pci0000:00/0000:00:04.0/mmc_host/mmc1 auto vfat defaults voldmanaged=sdcard1:auto

Whether i comment or uncomment the creation of symlinks to "/sdcard", "/mnt/sdcard/", the behavior is the same.

When i explicitly mount sdcard from shell prompt using "mount" commnd, it is able to mount.

Please help me to resolve this issue.

Thanks in Advance,

Anand.

[Jeff Sharkey]

That error is happening when Zygote is trying to prepare the multiuser mount namespace.

It looks like primary external storage is emulated on your device; is that FUSE daemon started and running?  (The mkdir might be failing against the read-only rootfs if the daemon isn't present.)

It might also be helpful to compare your configuration against a known working example:

http://source.android.com/devices/tech/storage/config-example.html

It sounds like you're building a "Emulated primary, physical secondary" device.  Hope this helps.

j

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[Anand R]

Hi Jeff,

Thanks for your valuable information.

My configuration is similar to the one that is there in the link.

"It sounds like you're building a "Emulated primary, physical secondary" device" => Yes I am building Emualated primary and physical secondary.

Can you please let me know how to check whether FUSE daemon is started and running.

I used "ps" command. I am not able to see any FUSE daemon process running.

Regards,

Anand.

j

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[Manivannan Palanisamy]

Hi Anand,

I am also facing the simillar issue. is that your issue got resolved. Please let me know.

[Steve Jones]

Hi Folks 

Here's is the init rc, fstab and storage_list that I am successfully using with an external sd card 

https://github.com/trevd/android_device_archos_a80sboard/blob/master/init.storage.rc . 

https://github.com/trevd/android_device_archos_a80sboard/blob/master/fstab.archosa80sboard

https://github.com/trevd/android_device_archos_a80sboard/blob/master/overlay/frameworks/base/core/res/res/xml/storage_list.xml 

Although my configuration files currently mount the root as r/w , I'm fairly certain it works when mount r/o , although I will have to double check that :)

trevd

[Manivannan Palanisamy]

Hi Steve,

Any specific changes required for emmc card setup. Please confirm since my board memory is using eMMC .

[Rohit Kumar]

Check the following configuration:
export SECONDARY_STORAGE /storage/sdcard1
mkdir /storage/sdcard1 0000 system system (you are using root which is causing permission issue)

Thanks

[Mica Cruz]

done ?? is this works?

i want to use my sd card as my phone storage