From owner-freebsd-current@freebsd.org  Wed Sep 19 15:06:39 2018
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From: "Rodney W. Grimes" <freebsd-rwg@pdx.rh.CN85.dnsmgr.net>
Message-Id: <201809191506.w8JF6W10024280@pdx.rh.CN85.dnsmgr.net>
Subject: Re: FreeBSD EFI projects
In-Reply-To: <1537368121.5568.1@hraggstad.unrelenting.technology>
To: Greg V <greg@unrelenting.technology>
Date: Wed, 19 Sep 2018 08:06:32 -0700 (PDT)
CC: Rebecca Cran <rebecca@bluestop.org>,
 Konstantin Belousov <kostikbel@gmail.com>, Warner Losh <imp@bsdimp.com>,
 FreeBSD Current <freebsd-current@freebsd.org>
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> On Wed, Sep 19, 2018 at 5:34 PM, Rodney W. Grimes 
> <freebsd-rwg@pdx.rh.CN85.dnsmgr.net> wrote:
> >>  On 9/18/18 4:11 AM, Greg V wrote:
> >> 
> >>  >
> >>  > I can confirm that the kernel already worked fine when booted from
> >>  > 32-bit EFI.
> >>  >
> >>  > I booted an old Mac into HardenedBSD using a 32-bit-EFI build of 
> >> GRUB2 :)
> >> 
> >> 
> >>  Was that a 64-bit version of FreeBSD? My understanding is the 32-bit
> >>  FreeBSD boots fine, but 64-bit needs work.
> > 
> > You would be hard pressed to find a system with a 64 bit CPU that
> > could run 64 bit FreeBSD that had a 32 bit EFI implementation.
> 
> Mac mini 2006 with a Core2Duo instead of the stock CoreDuo (and the 
> 2007 model's firmware flashed, but I don't think that impacts FreeBSD).

Yes, that is one of the catagories of rare, a EFI-32 bit system that
was originally shipped with a 32 bit only CPU, that later got upgraded
in the field with a 64 bit CPU, that still runs a EFI-32 bios.
Are you sure the 2007 firmware is EFI32?  I would of thought
since they upgraded the base system to a 64 bit CPU they would
of shipped it with a EFI-64 bios.

> 
> And probably just the 2007 model as well :)
> 
> Also, IIRC there were some Intel Atom tablets with 32-bit EFI.

Atom N2xx and Z5xx series Atom models cannot run x86-64

-- 
Rod Grimes                                                 rgrimes@freebsd.org