How to restore FreeBSD boot manager on GPT disk ?

[Warren Block]

On Tue, 8 Nov 2016, Warren Block wrote:

>> Are you forced to use GPT, because of UEFI-only motherboards?
>
> If the machine is booting in BIOS from a GPT disk, it *should* work to put 
> boot0 on there, replacing the PMBR.  I think, anyway, have not tested it.

Now that I think about it, this would require a "hybrid" setup, where 
the fake MBR must have partitions that match the starting points of the 
real GPT partitions.  I'm not aware of FreeBSD tools to create that type 
of monstrosity, but once set up, it could/might work with boot0.