using this menu item.

title FreeBSD
root(hd1,3,a)
kernel /boot/loader
boot

#  using the above i got this error.  "kernel /boot/loader    ERROR 15: file not found"

using alternative menu item.

title FreeBSD
rootnoverify(hd1,3)
chainloader +1
boot

# using this alternative method, i got this error. "chain loader +1   ERROR 13: invalid or unsupported exectuable format."