HP Proliant DL385 Gen10 refuses to boot FreeBSD 11

[Ewald Jenisch]

Hi,

Got a new HP Proliant DL385 Gen10 Server and wanted to install
FreeBSD. Starting from FreeBSD-11.1-RELEASE-amd64-bootonly.iso mounted
via the iLo virtual CD device the system started with the usual
install boot, but then suddenly crashed and rebooted the whole system
- boot loop basically.

I started playing around in the BIOS of the System trying UEFI
vs. legacy BIOS, as well a bunch of other parameters but to no extent:
the system just crashes when upon booting from the installation media :-(

To cross check I tried to boot a Linux installation media (Ubuntu
Server 16.04) and the server booted from the Linux ISO without any
problem. So I'm pretty sure it's something FreeBSD related.

My questions:

o) Anybody else out there seen a problem like this on a HP DL385 Gen10?

o) Any cure against it?

Thanks much in advance for any clue,
-ewald