booting problem with FreeBSD 5.1

[Marian-Nicolae V. Ion]

I was used in the past to boot my FreeBSD OS (I also have Linux and
QNX on the same machine) with the following lines in menu.list:

        root (hd1,0,a)
        kernel /boot/loader

However, once I've installed FreeBSD 5.1 this wasn't possible anymore
- grub was complaying something about an unknown file system (or
something like that).

The only solution I've found was to modify my menu.list this way:

        rootnoverify (hd1,0)
        chainloader +1

Does anybody have more experience on that? i.e. am I doing wrong,
I am missing something... or that's the new fashion of booting
FreeBSD?

Thank you very much for your patience of reading this,

M. Ion