5.2-RELEASE not booting after recompile

[Rob B]

Many moons ago I wrote that I was having trouble booting 5.2-BETA on a 
PC64.  Well, that machine was completely hosed

I've reinstalled 5.0-RELEASE and cvsupped to 5.2-RELEASE, and the problem 
is still there.

After the following process
buildworld
buildkernel
installkernel
reboot to single user
installworld
reboot

I am getting this error -

<snip>
jumping to bootstrap code
loading /boot/loader
|
halted CPU 0

halt code = 2
kernel stack not valid halt
PC = 7000000f0000
boot failure

What am I doing wrong?

There doesn't appear to be a /boot/loader.old that I can load either

Cheers,
Rob

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