Here is the output from "mount":

root@arndale:/data # mount
rootfs / rootfs rw,relatime 0 0
tmpfs /dev tmpfs rw,nosuid,relatime,mode=755 0 0
devpts /dev/pts devpts rw,relatime,mode=600 0 0
proc /proc proc rw,relatime 0 0
sysfs /sys sysfs rw,relatime 0 0
tmpfs /mnt/asec tmpfs rw,relatime,mode=755,gid=1000 0 0
tmpfs /mnt/obb tmpfs rw,relatime,mode=755,gid=1000 0 0
/dev/block/mmcblk1p3 /system ext4 rw,relatime,data=ordered 0 0
/dev/block/mmcblk1p5 /cache ext4 rw,nosuid,nodev,noatime,errors=panic,data=ordered 0 0
/dev/block/mmcblk1p6 /data ext4 rw,nosuid,nodev,noatime,errors=panic,data=ordered 0 0
/dev/block/vold/179:39 /mnt/media_rw/sdcard0 vfat rw,dirsync,nosuid,nodev,noexec,relatime,uid=1023,gid=1023,fmask=0007,dmask=0007,allow_utime0
/dev/block/vold/179:39 /mnt/secure/asec vfat rw,dirsync,nosuid,nodev,noexec,relatime,uid=1023,gid=1023,fmask=0007,dmask=0007,allow_utime=00200
root@arndale:/data #

"/mnt/media_rw/sdcard0" is in output but no "/storage/sdcard0".

On 20 March 2014 22:40, Botao Sun <botao.sun@linaro.org> wrote:

Hi Vishal,

For the SD MMC test on Samsung Arndale board, the value of EXTERNAL_STORAGE doesn't match with the output of "df":

root@arndale:/ # df
Filesystem               Size     Used     Free   Blksize
/dev                  1000.6M   164.0K 1000.4M   4096
/mnt/asec             1000.6M     0.0K 1000.6M   4096
/mnt/obb              1000.6M     0.0K 1000.6M   4096
/system                739.9M   371.1M   368.8M   4096
/cache                 243.9M     2.0M   241.9M   1024
/data                  487.8M    51.4M   436.4M   1024
/mnt/media_rw/sdcard0     5.8G    12.0K     5.8G   4096
/mnt/secure/asec         5.8G    12.0K     5.8G   4096

root@arndale:/ # echo $EXTERNAL_STORAGE
/storage/sdcard0
root@arndale:/ #

"/storage/sdcard0" is not in the output of "df". According to the output, the storage actually locates at "/mnt/media_rw/sdcard0", and I couldn't see there is any symbol link between them:

root@arndale:/ # busybox ls -ld /mnt/media_rw/sdcard0
drwxrwx---    4 media_rw media_rw      4096 Jan 1 00:01 /mnt/media_rw/sdcard0

root@arndale:/ # busybox ls -ld /storage/sdcard0
drwx------    2 root     root             0 Jan 1 00:00 /storage/sdcard0
root@arndale:/ #

However, data can be successfully written to /storage/sdcard0:

root@arndale:/ # written_message="abcdefghijklmn"
root@arndale:/ # echo $written_message > $EXTERNAL_STORAGE/sd-mmc-test.txt
root@arndale:/ # echo $?
0
root@arndale:/ # cat $EXTERNAL_STORAGE/sd-mmc-test.txt
abcdefghijklmn
root@arndale:/ # cd /storage/sdcard0
root@arndale:/storage/sdcard0 # ls
sd-mmc-test.txt
root@arndale:/storage/sdcard0 #

But file "sd-mmc-test.txt" doesn't exist under "/mnt/media_rw/sdcard0"

root@arndale:/storage/sdcard0 # cd /mnt/media_rw/sdcard0
root@arndale:/mnt/media_rw/sdcard0 # ls
LOST.DIR
root@arndale:/mnt/media_rw/sdcard0 #

Something wrong in the output of these storage partitions? The build I'm using is #386:

https://android-build.linaro.org/builds/~linaro-android/linux-linaro-arndale/#build=386

Best Regards
Botao Sun