can anyone just clarify what the root password on the n900 is

sometimes the command sudo gainroot will enable the shell othertimes it asks me for a password which i have never set

from reading the forums and wiki entrys i sort of found it could be either

rootme
passwd

is any of them correct it would be really handy to know as sometimes it wont let me enable shell unless i enter a password

thanks and sorry to bump an old thread like this just thought it better then startinga new one