Comment 52 for bug 1333140

> Also, I wonder what would happen if I simply erase and format the mmcblk0rpmb partition in ext4.

The Replay Protected Memory Block is not a normal partition. To access it you need the secret key it was most likely programmed with.

Even if you had this key it's unlikely you could do anything with it since this very bug looks like the kernel fails to communicate with it anyway.

> Is that partition really useful to Linux?

I think some Android OEMs might use it - I'd be very surprised if Ubuntu does.