On Wed, Sep 19, 2018 at 6:06 PM, Rodney W. Grimes
<freebsd-...@pdx.rh.cn85.dnsmgr.net> wrote:
On Wed, Sep 19, 2018 at 5:34 PM, Rodney W. Grimes
<freebsd-...@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.
The EFI firmware is technically 64 bit… but it only boots 32-bit
binaries.
https://everymac.com/mac-answers/snow-leopard-mac-os-x-faq/mac-os-x-snow-leopard-64-bit-macs-64-bit-efi-boot-in-64-bit-mode.html
'Furthermore, it appears that although subsequently released MacBook,
MacBook Air, and pre-"Mid-2010" Mac mini models all are equipped with
"Core 2 Duo" 64-bit processors and 64-bit EFIs, Apple has blocked these
"consumer-targeted" Macs from booting in 64-bit mode. iMac and MacBook
Pro models released in 2007 with 64-bit EFIs seem to have been blocked
as well.'
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
Atom Z3740 — "Instruction Set: 64-bit"
https://ark.intel.com/products/76759/Intel-Atom-Processor-Z3740-2M-Cache-up-to-1_86-GHz
The tablet in question: ASUS VivoTab Note 8 (M80TA)
https://www.asus.com/us/Tablets/ASUS_VivoTab_Note_8_M80TA/
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