AM3356: am335x filesystem UBIFS

Iftach Sharabi

Part Number: AM3356

Hi,

I am using the latest TI SDK 8.04, and I have a question related to UBIFS.

A partition originally created in ubifs format version 5 (SDK 8.04) is mounted as R/O when I downgrade to a software that only supports up to ubifs format version 4 (Earlier SDK version).

I am creating the partition on the board ad hoc. How can I solve this issue?

Is it possible to create a format version 4 partition while created over a board that its software is running format version 5?

Below is the error I am getting:

UBIFS error (ubi2:0 pid 207): 0xc038ca84: on-flash format version is w5/r0, but software only supports up to version w4/r0
(ubi2:0): only R/O mounting is possible

Regards,

Iftach

over 3 years ago

0 Bin Liu over 3 years ago

TI__Guru**** 181906 points

Hi Iftach,

Is the ubifs partition for the Linux rootfs and under use when you were trying to format it to ver4? If so, can you try to not use it as the rootfs (for example, boot from SD card, or use initramfs) then format the partition?

0 Martin Roth over 3 years ago in reply to Bin Liu

Prodigy 110 points

Hi Bin, The partition is not Linux rootfs. The partition is being formatted under latest TI SDK 8.04 and the resulting UBI format is 5. When reverting back to an older SDK and trying to access this already formatted partition (which was formatted with latest TI SDK 8.04) - it can be accessed only for reading and not writing. Is there a way that we can format the partition to format #4 under TI SDK 8.04, so it can be fully accessed (for reading & writing) from earlier TI SDK?

0 Bin Liu over 3 years ago in reply to Martin Roth

TI__Guru**** 181906 points

Hi Martin,

What command do you use to format the ubifs partition?

0 Iftach Sharabi over 3 years ago in reply to Bin Liu

Prodigy 10 points

ubiformat /dev/mtd${x} -s 4096 -O 4096 -f xyz.img

0 Iftach Sharabi over 3 years ago in reply to Iftach Sharabi

Prodigy 10 points

Please disregard the above.

These are the commands we use are:

/usr/sbin/ubiattach -m 27 -d 2 -O 4096

/usr/sbin/ubimkvol /dev/ubi2 -N data -n 0 -m // This command is called only on the first boot. It is not called every boot, as opposed to the ubiattach command above.

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AM3356: am335x filesystem UBIFS