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Mounting ubifs

mike A
Genius 3490 points

Hi,

I have flashed the ubi.image to nand partition by doing flash_eraseall and then nandwrite -p. (I have booted from the SD card and rootfs as NFS). How to mount this partition (containing ubi.img) image and modify the contents from it ?

Thanks & Regards,

Mike

  • 0
    Guru 11260 points

    Hi,

    I have flashed the ubi.image to nand partition by doing flash_eraseall and then nandwrite -p. (I have booted from the SD card and rootfs as NFS). How to mount this partition (containing ubi.img) image and modify the contents from it ?

    I assume you have mtd-utils in your rootfs,

    1:  $ mtdinfo /dev/mtdX

    where X is your partition where you flashed your ubi.img

    Note the 'Minimum input/output unit size' value

    2: ubiattach -m X -O Y

    Where X is same as above and Y is the value which you noted of 'Minimum input/output unit size'

    3: mount -t ubifs ubi0_0 /mnt/location

    do your modifications and then finally unmount. hope that helps!

    Thanks,

    --Prabhakar Lad

  • 0
    TI__Guru**** 170625 points

    Hi Mike,

    mike A said:
    How to mount this partition (containing ubi.img) image and modify the contents from it ?

    See the below links:

    http://processors.wiki.ti.com/index.php/UBIFS_Support#Mounting_UBIFS_image_as_a_regular_NAND_partition

    http://processors.wiki.ti.com/index.php/UBIFS_Support#Mounting_a_NAND_partition_using_UBIFS

    http://processors.wiki.ti.com/index.php/EZSDK_Using_data_on_SD_and_filesystem_on_NAND

    http://processors.wiki.ti.com/index.php/EZSDK_Fast_Boot_Streaming_Video

    http://processors.wiki.ti.com/index.php/TI811x_UBIFS_Support

    http://e2e.ti.com/support/dsp/davinci_digital_media_processors/f/717/t/157815.aspx

    http://e2e.ti.com/support/dsp/davinci_digital_media_processors/f/717/t/218639.aspx

    http://e2e.ti.com/support/arm/sitara_arm/f/791/t/248144.aspx

    http://e2e.ti.com/support/embedded/android/f/509/t/111277.aspx

    http://e2e.ti.com/support/embedded/linux/f/354/t/224152.aspx

    BR
    Pavel

  • 0 in reply to Prabhakar Lad
    Genius 3490 points

    Hi Prabhakar,

    I tried following your steps,

    but after mounting when I try to create a file I get following error:

    # touch sample.txt
    touch: cannot touch 'sample.txt': No space left on device
    #
    How to fix it ?

    Thanks & Regards,

    Mike

  • 0 in reply to Pavel Botev
    Genius 3490 points

    Hi,

    Forgot to mention apart from the above issue, When I try to mount for the second time I see following issues:

    # ubiattach -m4 -O 2048
    [  667.280000] UBI error: ubi_io_read: error -74 (ECC error) while reading 64 bytes from PEB 0:0, read 64 bytes
    UBI device number 0, total 1601 LEBs (203288576 bytes, 193.9 MiB), available 0 LEBs (0 bytes), LEB size 126976 bytes (124.0 KiB)
    #

    I dont see the above errors when I do it for first time.

    Thanks & Regards,

    Mike

  • 0 in reply to mike A
    TI__Guru**** 170625 points

    mike A said:

    but after mounting when I try to create a file I get following error:

    # touch sample.txt
    touch: cannot touch 'sample.txt': No space left on device
    #
    How to fix it ?

    Answered here:

    http://e2e.ti.com/support/dsp/davinci_digital_media_processors/f/716/p/377262/1328376.aspx#1328376

    BR
    Pavel