boot RSPRO from usb

[Monthadar Al Jaberi]

Hi,

sorry if this is old and answered somewhere, but I cant seem to find a solution:

I am trying to boot Freebsd current root file system @ RouterStation
Pro from usb (I did it before) but I cant remember how to do it.

I know I need  ROOTDEVNAME=\"ufs:/dev/da0\" but I dont seem to manage
to create a bottable root fs...

grateful for any advice

-- 
Monthadar Al Jaberi