pxe boot problems

[Mipam]

Hi,

Im trying to install freebsd on a system (i386 system) without cdrom or
floppy.
I created a loader.rc and the kernel (used from /boot/kernel) and I
created an mfsroot from the mfsroot.flp which can be downloaded from
freebsd.org. The kernel is loaded, then mfsroot is loaded.
my loader.rc

echo Loading mfsroot...
load -t mfs_root /mfsroot
echo booting...
echo \007\007
echo initializing h0h0magic...
set boot_userconfig
set vfs.root.mountfrom="ufs:/dev/md0c"
boot

after mfsroot has been loaded is see:
initializing h0h0magic...
then a loud BEEP and then it stops and the system reboots.....
What am i doing wrong? Any hints what to do now?
Bye,

Mipam.