Date: Wed, 19 Sep 2018 18:45:56 +0300 From: Toomas Soome <tsoome@me.com> To: "Rodney W. Grimes" <freebsd-rwg@pdx.rh.CN85.dnsmgr.net> Cc: Greg V <greg@unrelenting.technology>, Rebecca Cran <rebecca@bluestop.org>, Konstantin Belousov <kostikbel@gmail.com>, Warner Losh <imp@bsdimp.com>, FreeBSD Current <freebsd-current@freebsd.org> Subject: Re: FreeBSD EFI projects Message-ID: <ADFE301D-32DD-4CE1-BC99-0C6BEE3D1284@me.com> In-Reply-To: <201809191531.w8JFVeDN024426@pdx.rh.CN85.dnsmgr.net> References: <201809191531.w8JFVeDN024426@pdx.rh.CN85.dnsmgr.net>
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> On 19 Sep 2018, at 18:31, Rodney W. Grimes = <freebsd-rwg@pdx.rh.CN85.dnsmgr.net> wrote: >=20 >> On Wed, Sep 19, 2018 at 6:06 PM, Rodney W. Grimes=20 >> <freebsd-rwg@pdx.rh.CN85.dnsmgr.net> wrote: >>>> 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: >>>>>>=20 >>>>>>>=20 >>>>>>> I can confirm that the kernel already worked fine when booted=20 >>>> from >>>>>>> 32-bit EFI. >>>>>>>=20 >>>>>>> I booted an old Mac into HardenedBSD using a 32-bit-EFI build=20 >>>> of >>>>>> GRUB2 :) >>>>>>=20 >>>>>>=20 >>>>>> Was that a 64-bit version of FreeBSD? My understanding is the=20 >>>> 32-bit >>>>>> FreeBSD boots fine, but 64-bit needs work. >>>>>=20 >>>>> 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. >>>>=20 >>>> 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=20 >>>> FreeBSD). >>>=20 >>> 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. >>=20 >> The EFI firmware is technically 64 bit? but it only boots 32-bit=20 >> binaries. >>=20 >> = https://everymac.com/mac-answers/snow-leopard-mac-os-x-faq/mac-os-x-snow-l= eopard-64-bit-macs-64-bit-efi-boot-in-64-bit-mode.html >> 'Furthermore, it appears that although subsequently released MacBook,=20= >> MacBook Air, and pre-"Mid-2010" Mac mini models all are equipped with=20= >> "Core 2 Duo" 64-bit processors and 64-bit EFIs, Apple has blocked = these=20 >> "consumer-targeted" Macs from booting in 64-bit mode. iMac and = MacBook=20 >> Pro models released in 2007 with 64-bit EFIs seem to have been = blocked=20 >> as well.' >=20 > That is not EFI32, so that is not a test case for how FreeBSD boots = = =20 > on EFI32 systems. That is a restriction apple artificially placed > in the implementation. >=20 >>>> And probably just the 2007 model as well :) >>>>=20 >>>> Also, IIRC there were some Intel Atom tablets with 32-bit EFI. >>>=20 >>> Atom N2xx and Z5xx series Atom models cannot run x86-64 >>=20 >> Atom Z3740 ? "Instruction Set: 64-bit" >> = https://ark.intel.com/products/76759/Intel-Atom-Processor-Z3740-2M-Cache-u= p-to-1_86-GHz = <https://ark.intel.com/products/76759/Intel-Atom-Processor-Z3740-2M-Cache-= up-to-1_86-GHz> >=20 > The above does not say Atom Z3xxx. If you find a Atom > N2xx or Z5xx based system it most certainly has a EFI32. >=20 >>=20 >> The tablet in question: ASUS VivoTab Note 8 (M80TA) >> https://www.asus.com/us/Tablets/ASUS_VivoTab_Note_8_M80TA/ = <https://www.asus.com/us/Tablets/ASUS_VivoTab_Note_8_M80TA/>; >=20 > I can not find enough detail to know for certain that tablet > actually has which version of EFI. > You are saying it has EFI32? And if so based on what information? >=20 I have Lenovo MIIX-300 and it has UEFI32. rgds, toomas
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