FreeBSD 6.1 - nullfs not working with PAE

[tonix (Antonio Nati)]

I'm trying to setup a system with 8GB of RAM, so I've enabled PAE option.

But when I try using a mount_nullfs, I always have this error:

	mount_nullsfs: Operation not supported by  device

No problem arises when I compile kernel without PAE.

I cannot find any documentation about nullfs and PAE.
Why is a so simple filesystem (nullfs) incompatible with PAE?

Thanks,

Tonino