ubi create rootfs fails

Hello,

sorry for late response.

The command ".ubivol_std" executes the following commands:

• ubi part TargetFS
• ubi create rootfs

Your error no space left comes from the fact that already a partition with ubi create "name" has been created. But there is already a partition which takes the the whole size. This does not make it possible to create a second partition. If you want to execute the command

then you have to make sure that the partition is empty. The easiest way is to delete the partition

After that you can run the command

Your F&S Support Team

Thanks for the hint.

Your F&S Support Team

Some important additional information. The command is not missing, we have deliberately not mentioned it, because it is usually wrong to use this command.

is only used once, when the board is completely fresh. Then the MTD partition TargetFS is converted to an UBI and the rootfs volume is created. Later, when you just want to install a new rootfs, you simply download your image and then call

You do not have to create the rootfs volume over and over again, just write to to the already existing rootfs volume. UBI will erase any old content automatically.

Erasing the partition by hand has a very very big disadvantage. Let me explain why.

UBI does wear leveling. That means it counts how often each block was erased and if single blocks have been erased quite often, i.e. have a high erase count, UBI prefers other blocks when writing, and even relocates data from time to time, even read-only data, so that other blocks with low erase counts will be used, too. So for a short period of time, blocks may show different erase counts, but in the long term, the counts are as similar as possible.

If you erase such a partition with a low-level nand erase command, you also delete those UBI erase counters, or in other words the wear leveling history. This renders the whole procedure rather useless. So avoid erasing any MTD partition with UBI on it wherever possible.