FreeBSD 5.3; howto migrate from i386 to amd64 mode

[Meyendriesch, Burkard]

hello folks,

about a year ago I installed 5-CURRENT on my Athlon64 based box (Asus K8V).
Because at that time amd64 mode didn't work very well with a lot of ports
I installed FreeBSD in i386 mode. Meanwhile I followed the release path
to 5.3. Everything works very fine (with i386 mode).

Now I want to use the full power of my 64 bit CPU. I cross compiled the
kernel to amd64 mode:

# cd /usr/src
# make kernel TARGET=amd64 TARGET_ARCH=amd64 KERNCONF=REINEKE64

and tried to reboot the machine with the new kernel. The kernel himself
seems to work but when he tries to mount the root filesystem the system
hangs. I think something in my migration is wrong.

Can someone please tell me the correct procedure to get my system work
in amd64 mode without complete re-installation.

Thanks a lot
Burkard