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Date: Sat, 6 Jul 2013 06:29:20 -0600 (MDT)
From: Warren Block <wblock@wonkity.com>
To: Simon <simon@optinet.com>
Subject: Re: FreeBSD 9.1 won't boot after install
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On Sat, 6 Jul 2013, Simon wrote:

> On Fri, 5 Jul 2013 19:43:02 -0600 (MDT), Warren Block wrote:
>
>>> I booted the 9.1 install CD, executed "gpart destroy -F ada0", and
>>> installed.  After completing the install, boot fails with:
>>>
>>> ERROR: No boot disk has been detected or the disk has failed.
>
>> That is a BIOS error, probably due to UEFI expecting a certain disk
>> layout when it finds GPT.
>
>
> Does this mean GPT is not supported by this system?

Kind of the opposite: UEFI expects GPT, but also expects a particular 
set of partitions.  And then there's the SecureBoot situation.

> I thought GPT is supposed to replace MBR and UEFI is the future. 
> Perhaps there is something in UEFI that can be tweaked to make it work 
> with GPT?

Yes.  There should be some sort of legacy boot.  In UEFI mode, 
SecureBoot can be disabled, so with the correct partition layout FreeBSD 
should boot even in UEFI (untested, I do not yet have a UEFI system).