Options for boot program

[John Baldwin]

I can identify with your condition. :)  Unfortunately, the early boot loaders 
(boot0, and boot1+boot2) are simply too tight on space to add more features.  
I think boot0 literally has 0 or 1 bytes free right now.  
However /boot/loader has a lot more free space and can be easily and 
intuitively configured via /boot/loader.conf.

All of the boot code can be found under src/sys/boot.

-- 
John Baldwin