Getting boottime early in booting

Hi,

I'm fiddling with a NFSv4 diskless root fs setup and I've run
into a couple of challenges.

1 - I need a value that will be different each time the machine boots.
     I would normally use getboottime(), but for the NFS root fs mount,
     it just returns 0.
     Any ideas w.r.t. something I can acquire early in booting that will
     change each time the system is booted?

2 - Does anyone know how to fix "could not determine audit condition"
     which I get whenever I try and login when it is multiuser?
     (I can run single user, but since I can't login once it's multiuser??)

Thanks for any help with these, rick