bhyve: Detecting that a guest kernel has booted

[grehan at freebsd.org]

> This branch is 8930 commits behind tianocore:master.
> And depends on an external git belonging to Peter Grehan,

  No, it isn't.

  https://github.com/freebsd/uefi-edk2

  Under FreeBSD project control since Oct 16, 2015.

later,

Peter.