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Date:      Sat, 7 Oct 2017 11:53:46 -0500
From:      Karl Denninger <karl@denninger.net>
To:        freebsd-stable@freebsd.org
Subject:   Re: Installing amd64 FreeBSD 11.1 in dual-boot with Windows 7 on an MBR partitioned disk
Message-ID:  <3475118a-208b-5f25-7da3-b8a7e83afe2f@denninger.net>
In-Reply-To: <CANt7McFK349gVvZhgED62J9dxZSDW5kw2_mrYs73QcqYBzGU_A@mail.gmail.com>
References:  <CANt7McGqZG0mJFmuQgE4_rFu_0kmnyUCUCZyrrThKMjJtnyewA@mail.gmail.com> <59D7BE53.5050409@grosbein.net> <CANt7McEUP1MC32zJt0%2BbOi-1A6FFXr-C2D6ibKB5gZKr5xWEyQ@mail.gmail.com> <CANCZdfpRJg4twPJ34V=6s-MEXnKM-9eHzW3pyb93TyN%2Bg4vfBg@mail.gmail.com> <CANt7McFK349gVvZhgED62J9dxZSDW5kw2_mrYs73QcqYBzGU_A@mail.gmail.com>

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On 10/7/2017 11:27, Rostislav Krasny wrote:
> On Sat, Oct 7, 2017 at 6:26 PM, Warner Losh <imp@bsdimp.com> wrote:
>> Sorry for top posting. Sounds like your BIOS will read the botox64.efi=
 from
>> the removable USB drive, but won't from the hard drive. Force BIOS boo=
ting
>> instead of UEFI and it will install correctly. However, it may not boo=
t
>> Windows, which I think requires UEFI these days.
>>
>> The root of the problem is that we have no way to setup the EFI boot
>> variables in the installer that we need to properly installed under UE=
FI.
>> I'm working on that, so you'll need to be patient...
>>
>> Warner
> My computer doesn't have any EFI partition and this explains why the
> installed FreeBSD boots in the BIOS mode on it. The installation media
> probably has the EFI partition (with the bootx64.efi) and then BIOS
> probably boots the installation media in the UEFI mode instead of the
> BIOS mode. So the "machdep.bootmethod" sysctl doesn't represent the
> BIOS boot mode configuration but a boot method the currently running
> system was booted in. If this is true then the "machdep.bootmethod"
> sysctl should not be used in bsdinstall. At least not for the
> bootability check. Something else should be used for the bootability
> check or the bsdinstall should trust the user choice.
>
> BTW this is how the EFI partition looks like in someone's Windows 7
> disk manager:
> https://www.easyuefi.com/wintousb/images/en_US/efi-system-partition.png=

> and this how it looks without any EFI partition in my system (with
> Windows 7 / FreeBSD dual-boot)
> http://i68.tinypic.com/9u19b8.png
>
> I think even that NTFS System Reserved partition is not mandatory for
> Windows installation. It just used to keep Windows boot files in a
> safe, place preventing accidental deletion by a user. It's being
> created if Windows is installed on an empty disk but if you create
> just one big NTFS partition prior to the Windows installation and
> install it on that single partition it will be ok. There will be just
> more Windows system files on the C disk, for example ntldr,
> NTDETECT.COM. It can be checked on VM, for example on VirtualBox.
> _______________________________________________
The problem with the new installer appears to be that it follows this
heuristic when you boot FreeBSD media from a USB stick or similar media:

1. If the system CAN boot EFI then it WILL EFI boot the FreeBSD
installer from that media.

2. The installer sees that it booted from EFI.=C2=A0 It also sees a fixed=

disk with a non-EFI boot environment.=C2=A0 It declares that fixed disk
environment "non-bootable", which is not by any means a known fact.

3. Having done that it will then "offer" to re-initialize the disk as
EFI/GPT, which is ok if you don't have anything else on there that you
want.=C2=A0 If you DO then it's obviously not ok, and in that instance it=

both won't load the MBR boot manager *and* won't load the second-stage
MBR boot code either.

You can get around this by hand-installing both parts of the boot code,
which is what I wound up doing on my Lenovo laptop.=C2=A0 That machine wa=
s
originally delivered with Windows 7 and upgraded "in place" to Win10,
which is why the disk is MBR-partitioned rather than EFI/GPT, although
the machine itself does support EFI booting.

I would suggest that the FreeBSD installer should be more-intelligent
about this, but I suspect it's a fairly uncommon set of circumstances.=C2=
=A0
Far more troublesome in the EFI world is the fact that "out-of-the-box"
multi-boot in an EFI environment is a five-alarm pain in the butt
although there are EFI boot managers that make it reasonable.

--=20
Karl Denninger
karl@denninger.net <mailto:karl@denninger.net>
/The Market Ticker/
/[S/MIME encrypted email preferred]/

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