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Date: Mon, 06 Oct 2014 20:13:13 -0400
From: Adam McDougall <mcdouga9@egr.msu.edu>
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Subject: Re: Media image names - Document & rationalise.
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On 10/06/2014 16:34, John Baldwin wrote:
> I believe the issue here as I discussed with Marcel last year is that the x86 
> installer needs to tell gpart to set the active flag on the dummy MBR slice in 
> the PMBR if GPT is being used without EFI (the installer knows if it is booted 
> via EFI or not).

I ran into this today too with 10.1-RC1 (and recent 11 I think) on a
BIOS based desktop freshly liberated from windows.  It would not boot.
I got it going with gpart but as a new user I'd be in trouble.

> 
> In 9.2 and older, the flag was always set, but that violated the EFI spec and 
> broke several systems, so in 9.3 and later, gpart was changed to not set the 
> flag by default.  However, we should still set it for non-EFI booting via GPT 
> to cater to broken BIOSes (such as yours).
>