option for "boot to kernel.old"

[esmith]

Matthew Dillon wrote:
:
:If DF had an eigth option on the DF boot/logo screen that is "boot to kernel.old", it 
:would come in handy.

    And, even better... if someone does a 'make installkernel' more then once
    without rebooting it shouldn't overwrite kernel.old the second time, and
    if someone does a 'make installkernel' while *running* kernel.old it
    shouldn't overwrite kernel.old either.
    Would someone like to put a patch together with all three items?

I'll start working on this soon, however, if someone else finishes it before I do, I 
won't mind.