SD card issue with beaglebone black

[sanjay ahuja]

Hi,

I tried using microSD card as extra storage for my beaglebone black. I followed the steps as mentioned at http://elinux.org/Beagleboard:MicroSD_As_Extra_Storage.

I was able to use mount microSD card successfully. However I am facing some strange issue.

when I do ls -lart on the mounted drive the permissions are

drwx------  5 root root 16384 Jan  1  1970 drive

If I try chmod o+rx,g+rx /media/drive, to change the permissions, it does not work. No error on issuing chmod command but permission does not get change.

Infact I am not even able to change the user permission for any executable file under directory 'drive'.

For ex. 

bash-4.2# ls -lart /media/drive/jdk1.7.0_60/bin/java

-rw-r--r-- 1 root root 5822 May  7 20:26 /media/drive/jdk1.7.0_60/bin/java

bash-4.2# chmod u+x /media/drive/jdk1.7.0_60/bin/java

bash-4.2# ls -lart /media/drive/jdk1.7.0_60/bin/java

-rw-r--r-- 1 root root 5822 May  7 20:26 /media/drive/jdk1.7.0_60/bin/java

Since 'x' permission is missing, I am not able to execute any binary file. I am logged in as root user only. The jdk directory is expanded from jdk installer zip using command

tar -xvf Downloads/jdk-7u60-linux-arm-vfp-sflt --owner root --group root --no-same-owner.

No issues are encountered if the jdk directory is expanded under home directory instead of SD card.

The partition details for SD Card:

Usage : Filesystem

Partition type: W95 FAT16 (LBA) (0x0e)

Type: FAT (16-bit version)

Device: /device/mmcblk1p1
Mount Point: Mounted at /media/drive

Any help will be really appreciated.

Thanks,

Sanjay Ahuja 

[Robert Nelson]

re-partition it as "ext4"... fat16 doesnt' support user permissions..

Regards,

--
Robert Nelson
http://www.rcn-ee.com/

[sanjay ahuja]

Hi Robert,

Do you have any pointer to steps for partitioning it as ext4. The link I followed specifically mentioned that partition type must be 'FAT'. The content of uEnv.txt as provided there is

mmcdev=1

bootpart=1:2

mmcroot=/dev/mmcblk1p2 ro

optargs=quiet

Would it remain same if partition type is 'ext4' or some values would change?

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[sanjay ahuja]

Basically what should be content of uEnv.txt if we are mounting external SD card with partition type 'ext4'?

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[William Hermans]

sanjay, uEnv.txt should not have to change at all, content wise. Everything in this file just "tells" uboot where:

1)  to load the kernel, and board file for the BBB

2) where the root file system is.

3) Lastly, optargs=quite means to be less verbose with kernel debug output ( I believe )

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