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Subject: [Bug 194359] bsdinstall(8) should set active flag in GPT PMBR if not
 booting using EFI
Date: Wed, 22 Oct 2014 15:02:05 +0000
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=194359

--- Comment #21 from Allan Jude <allanjude@FreeBSD.org> ---
(In reply to hans from comment #20)
> (In reply to Allan Jude from comment #19)
> 
> I just tried the modified boot-only iso on an Intel DP965LT. After an Auto
> (ZFS) install the system now reboots without any problems. Auto (UFS) still
> has the same issue as before ("No bootable device -- insert boot disk and
> press any key"). which of course is as expected.
> 

Thanks for taking the time to test this for me. So it does seem that this is
solving the problem

> On my Asus NL4VM-DH installing UFS works, but I still get a message about 
> being unable to read the backup GPT header. Rebooting a ZFS installation
> fails (register dump followed by "BTX halted"), but that also happens when
> installing 10-RC2 on ZFS, so I do not think this is relevant to the issue at
> hand.

Is there anything special about your disk setup that might cause issues with
the very last sector? Some motherboard RAID and other types of things store
their metadata in the last sector, and can clash with GPT, although those are
supposed to make the logical drive 1 sector smaller so that this doesn't
happen.

Is that NL4VM-DH using UEFI?

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