Ping after week - is there interest in this patch?

I know that

- it doesn't apply cleanly as it depends on the other one I sent later
  and was discussed
  
- documentation needs to be adjusted as well

- it's a bit corner case but improves flexibility of the configuration
  and is useful for debugging, early HW init, fixing filesystems from
  initial tmpfs etc.

WDYT?

S_W