Can NOT boot FreeBSD on Dell R900

[Huang wen hui]

hi,
I boot FreeBSD 7.0R on R900, it stops with an error message:
can't load 'kernel'

Output from lsdev:

cd devices:
cd0: Device 0x0
disk devices:
disk0: Bios drive C:

ls cd0:/ can find files on CD.

load cd0:/boot/kernel/kernel works, but boot -v stop |\ status.

also "show" command does not show message, just blank.

Does any hints can solve this problem ?

thanks

--hwh