-CURRENT and -STABLE Cross Booting?

[This isn't really an SMP question, but it is germane to the SMP testing 
that I'm doing. I'm not clued into the booting differences between 
-CURRENT and -STABLE, so I'd appreciate any pointers you might have.]

I hope to automate as much of the testing as possible. Ideally, I'd even 
like to automate the booting of one machine into either the -CURRENT or 
-STABLE branches. I have different disks and different slices for each 
branch. Of course, I'd also like to be able to boot different kernels 
within a branch so that the effect of WITNESS and other options can be 
quantified and tracked over time.

I'm confident that I can figure out how to automatically futz 
/boot/loader.conf to load different kernels within a branch. (Are there 
any issues introduced by running from a kernel other than /kernel or 
/boot/kernel/kernel?)

But I'm not aware of any way to script input to boot0. Hence booting one 
branch or the other currently requires a console key press and so can't 
be automated.

Is it possible to use /boot/loader from one branch to load a kernel from 
a different branch on a different disk or slice? If so, what're the 
issues involved in this.

    Thanks,

    Bob



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