how does freebsd know which kernel to boot ?

[claudiu vasadi]

hello ppl,


I was wondering about the following:

After I do "make build|install kernel" and reboot, the new kernel is
automatically booted but the old one is still on the disk. Therefore, how
does FreeBSD know which one to boot ?

I'm guessing it's writing this info somewhere but I do not know where or
how.



Can anyone give me some short description ?