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Unable to mount eMMC partition in NFS booting am335x

Ankur Tank
Expert 2985 points
Hi,
We are using BBB(am335x) based custom board.
We have interfaced eMMC with am335x as it is interfaced in the beaglebone black.
After booting board from NFS i am able to do raw read/write to eMMC, Partition & formate the partition.
But after formating the partition when i try to mount the partition mount gives error saying "failed : not such file as /mnt/rfs"
but actually /mnt/rfs folder is present. Now my doubt is how do I flash/extract RFS on eMMC if I am not able to mount it?
And how should i debug this mouting issue.
Note that raw read/write works as I am able to boot from raw partition from SPL, U-Boot till kernel.
Any suggestions/pointer for this issue?
Thank you,
Regards,
Ankur
  • 0
    TI__Guru** 116100 points
    How did you formatted the raw eMMC ?
    Did you configure the eMMC with mix of raw and partitioned type ?
    Like, left out the first 10MiB as a raw for SPL,u-boot and kernel booting in raw mode and rest of the size of eMMC would be formatted as ext3 for filesystem mounting ?
    What command did you follow to format ?
  • 0 in reply to Titusrathinaraj Stalin
    Expert 2985 points

    Hi Titus,

    Thank you for reply,
    I partitioned eMMC in 3 partitions as shown below,

    # fdisk -l /dev/mmcblk0

Disk /dev/mmcblk0: 3841 MB, 3841982464 bytes
255 heads, 63 sectors/track, 467 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

        Device Boot      Start         End      Blocks  Id System
/dev/mmcblk0p1   *           1           5       40131   c Win95 FAT32 (LBA)
/dev/mmcblk0p2               6          30      200812+ 83 Linux
/dev/mmcblk0p3              31          55      200812+ 83 Linux

    Then I didn't format /dev/mmcblk0p1 and wrote SPL, U-Boot, Kernel, dtb in /dev/mmcblk0p1.
    Then I formatted the /dev/mmcblk0p2 and tried mounting it as shown below,

    # mkfs.ext4 /dev/mmcblk0p
mmcblk0p1  mmcblk0p2  mmcblk0p3
# mkfs.ext4 /dev/mmcblk0p
mmcblk0p1  mmcblk0p2  mmcblk0p3
# mkfs.ext4 /dev/mmcblk0p2 -L "ROOTFS"
mke2fs 1.42.8 (20-Jun-2013)
Discarding device blocks: done                            
Filesystem label=ROOTFS
OS type: Linux
Block size=1024 (log=0)
Fragment size=1024 (log=0)
Stride=0 blocks, Stripe width=0 blocks
50400 inodes, 200812 blocks
10040 blocks (5.00%) reserved for the super user
First data block=1
Maximum filesystem blocks=67371008
25 block groups
8192 blocks per group, 8192 fragments per group
2016 inodes per group
Superblock backups stored on blocks: 
        8193, 24577, 40961, 57345, 73729

Allocating group tables: done                            
Writing inode tables: done                            
Creating journal (4096 blocks): done
Writing superblocks and filesystem accounting information: done 

# mount -t ext4 /dev/mmcblk0p2 /mnt/rfs/
mount: mounting /dev/mmcblk0p2 on /mnt/rfs/ failed: No such device
# 
# 
# 
# ls /mnt/
rfs   rfs2  rfs3

    Now i don't know what is wrong with this, any suggestions for debugging this issue?


    Thank you,

    Regards,
    Ankur

  • 0 in reply to Ankur Tank
    TI__Guru** 116100 points
    Have you tried any other filesystem ?
    FAT or EXT2 or EXT3 etc.,
  • 0 in reply to Titusrathinaraj Stalin
    TI__Guru** 116100 points
    Also please make sure that you have enabled "EXT4" support in kernel.
    I hope you might have completed.
  • 0 in reply to Titusrathinaraj Stalin
    Expert 2985 points
    Hi Titus,

    Ya it was my silly mistake :P
    I knew that ext4 support has to be enabled and I had enabled it also, but somehow uImage in my tftpboot was old and it didn't have ext4 support enabled. I replaced it with latest and now I am able to mount that emmc partition.
    Thank you for help,

    Regards,
    Ankur
  • 0 in reply to Ankur Tank
    TI__Guru** 116100 points
    Hi Ankur,
    Sounds good.
    Thanks for your update.

    FYI.
    We can also check the available filesystem support in booted kernel through the following command.
    cat /proc/filesystem

    I hope you might know this but it would help other other community members.
  • 0 in reply to Titusrathinaraj Stalin
    Expert 2985 points
    Hi Titus,

    It was back of my mind but I forgot to check it.
    Thank you for reminding it :)

    Regards,
    Ankur