From owner-freebsd-hackers@FreeBSD.ORG  Sat Mar 14 11:57:39 2015
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Date: Sat, 14 Mar 2015 13:57:33 +0200
From: Konstantin Belousov <kostikbel@gmail.com>
To: Steven Hartland <killing@multiplay.co.uk>
Subject: Re: Server with 3TB Crashing at boot
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Cc: "freebsd-hackers@freebsd.org" <freebsd-hackers@freebsd.org>,
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On Sat, Mar 14, 2015 at 11:43:49AM +0000, Steven Hartland wrote:
> Thats failing in bus_dmamem_alloc so as a guess I'd say there's no space 
> below the 4GB boundary for the allocation of size qsize.

If this is indeed the case, laoder tunable hw.dmar.enable=1 could help.
I assume that machine of this class does have VT-d hardware, you might
need to enable it in BIOS.