We're transferring a file system over the network to our system as a single file and want to unpack it into RAM for 
further processing.

The documentation hints that we should be able to make up an EFS file system and use this with devf-ram.

I can run devf-ram and it creates a file /tmp/fs1 but I'm unsure as to how to initialise this with the efs image.

What is the correct sequence to mount an efs file using devf-ram? (along with flashctl?)

As an alternative, we've discovered that tar appears to be able to create directories in /tmp.  This goes against 
previous advice we've had that /dev/shmem doesn't support directories, and also with mkdir failing there.

would this be a viable alternative?

Regards